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1. Fig 10 File gt Save As DEMO1 lt Yes gt to replace an existing file if there is one This should match our distribution model DEM OTR3B M S2 Now let s experiment a bit more messing around 2 Drag bead green around a bit You ll find you can only move it along the invisible line guide 3 B any changes you just made 4 Drag either P11 or P13 You ll find that bead1 stays on the line between them March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 60 Interacting with Models Reshape the stern 5 BN any changes you just made 6 or lt F gt to seethe full profile view Bow editing discussion By making bead1 a bead on the line guide between P11 and P13 we constrained bead1 to always lie on the line between P11 and P13 we can make many alterations in the position of P11 bead1 and P13 and still get a perfectly straight stem Also since M CTI is defined by just three free control points P11 P13 and P14 it will always liein a plane and as long as we keep Y Ofor each of the points the curve will lie in the centerplane Reshape the stern A racy bow cries out for a racy stern DEM O TR3 s cylindrical transom has a moderate aft rake typical of a small cruising vessel H owever a reversetransom might look more racy and some added waterline length would confer a hydrod
2. Fig 8 Curvature profile MultiSurf has a graphical aid that will show you the straightness as well T 1 Click toturn on Curves filter 2 Select MC1 then click or choose View gt Display gt Curvature Profile Arc length measured from the t 0 end of the curve is the horizontal axis and curvature is vertical The t 0 end of the graph is marked by the white circle Fig 9 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 59 Interacting with Models Reshape the stem a Fig 9 Now to read the graph you need to know that a high curvature valuein the Curvature Profile indicates a tight curve a zero curvature value shows the curve is straight As you can see the curvature of M C1 is now absolutely zero the curveis absolutely straight for nearly the first three quarters of its length from t O to just beforet 0 5 which is hidden in the first downward jog Note that the curvature displayed is that of the current projection of the curve 3 Switch to the or lt Z gt view and see how the Curvature Profile changes all zero since MCT liesin the centerplane 4 lt Close gt the curvature profile display 5 Return to the 7 or Y profile view Hide Line guide Hide guide for thetime being 1 Select guide and click 9 f The model updates and guide is invisible Fig 10 But itis still there as a guide line for bead1 mer
3. Fig 20 Now let s see how the deck and hull have changed but have also remained accurately joined 17 Turn on Symmetry Images again and rotate around the model You ll probably need to zoom out in order to see the whole boat That s all for this tutorial File gt Exit do not save changes Tutorial wrap up In this lesson you have utilized most of the ways that MultiSurf provides for interacting with models You have created quite a number of entities deleted a few and edited several aspects of many other entities their names colors visibility and parent entities You have taken the simple hull DEMO and its descendant DEM O TR3 through a series of transformations including e scaling to new overall dimensions e modification of bow and stern profiles e modification of a set of stations e addition of a deck surface You have met several new entities and seen how they can be applied sometimes as a temporary construction guide sometimes as a permanent part of the model to capture and enforce relationships between model dements We have emphasized the potential for building in qualitative relationships or properties that are durable automatically preserved following changes in the underlying entities e astemthatis durably straight e atransom that is durably attached to the hull and is durably cylindrical e acovestripe that durably lies on the surface e adeckthatis durably smooth at the cent
4. 65 Adda COVE stripG ss caer ne bereit eee cree ererrererere trerereee epee ree tree ener E DELE 67 Add adeck surface eise seen nenne aa Ee aaa aiaa trenes tnnt tren snnt 68 Rreurdroim E m 72 Introducing More MultiSurf Entities 75 NUN E 75 PU CS se PH A A 76 dg 80 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e iii Contents ec Inde e cca agence cd dated ienaidnieki aiani paapaa ea sande ad deta aeaaeai aiaa eiii 85 B spline CUIVOS cisicss enters 86 B Spline Snakes e eme iet d he Me debate ende eno enc dt Dena pene sin eaten Rede 88 C spline Lotted Surfaces ete euet tid eave etnies 89 B spline Eofted Surfaces tian e eerte ee be e odere ce n rere as 90 Projet CUFVES mu 91 Tutorial AWEaAp U xen e one rt eme Sh Per Ene tee ih e Lee ter e Pe nv e bee neas 91 Building Tangency with B splines 93 Mp EE 93 B spline Curves The Endpoint Tangency Property sss 94 Check program settings sssessssssssesseseeeene teens 94 The B spline Curve ssssessssssseeeseeenne nennen tnnt trennen etre nnne nns 94 The Polyline Display sssssssessseseeeeeee nennen ntn tenete nnne trennen 95 Tangency and B spline Curve Loops ssssssesssseeeeenee nennen nnne nre tnnt 96 Add the Bead as a Control
5. sse 39 Making a watertight horizontal bottom sssssssssseeseeee tete 39 grs M 41 cif T PC 41 Creating the transom surface sse eese ener ennt trennen ener stretti 42 Locating the oarlock a Bead sssssssssssssssseseeenee eterne nnne tnter entren tnn 44 Thet parameter and tickmarks for a curve 44 Dragging GGG EE 45 Adding thwarts societas tod Eni INN LNCL SEM EM Mri D EN Er 45 Looking at u v surface parameters ssssssssssssseeenenee nennen 45 Three thwarts sistent IQILI UU TT m 46 Refining the FoWw Doa tia e Ee e ide ere oe e Me te dede intus 48 Tutorial oce M 49 Interacting with Models 51 LO SB P ER 51 Check program settings ernie teer nde tne ent dr e de A ee enn 52 sio mM E ETE 52 SWIPE MOY RR 54 Reshape the stem esesisseseeseese seen etna nnne tetn etn tn strata thin strana tnnt natn atrae tetti natns 55 Move point PLD oon cee ceceescesceeeeeeeeceeeseeensenseeaeeasseesaesecassaeeaeseeaeeassensasseeaseeseeneeseeneeneetaeas 56 MovepolDE P TZ cette rer eee e REFERAT TRI a eden 57 Make a durably straight stem sesenta 58 Re shape the Ster iaeiiai aiana aaiae err espe Era Eee rin e ERE ee Fa eens dea ER aie Ks Pa eae 61 RealGM Stat t
6. Close PWRB2 don t save changes A Movable Bulkhead 1 Open BULKHD 1 yes welooked briefly at this model in Tutorial 1 x 2 gt Point nametags 3 Select the bead e0 green 4 or Show Hide gt Show Children Fig 17 pO and pl ydlow are the endpoints of a line that runs along the X axis e0 and el green beads on this line define the 2 Point Plane a0 that is perpendicular to the X axis Since el is a Bead relative to e0 you can move the plane anywhere along the length of the hull by moving e0 5 Drag e0 aft and watch the transverse plane a0 e 6 Curve nametags nO and n1 magenta are Intersection Snakes along the intersection of the hull and deck surfaces and the plane a0 They move when the plane moves In addition they make the bulkhead hull and bulkhead deck joins watertight The bulkhead surface white is a Ruled Surface between the Intersection Snakes and it therefore also moves with the plane a0 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 123 Marine Design Examples Superstructures 7 Drag e0 forward and aft to various locations and focus on how the dependencies we ve set up make the bulkhead position flexible yet maintain the accurate joins to the hull and deck x 8 gt Point nametags off What if you have a certain X location wherethis bulkhea
7. The basis curve cyan is a Type Arc through 3 points arc bead1 and bead are two green beads The SubCurve sidepanel is red 2 Select the cyan Arc midsection Thecircle marks the t 0 end of the arc 3 Select the red SubCurve sidepanel This circle denotes the t 0 end of the SubCurve t 1 is the other end of course The black V indicates the direction of increasing t 4 or View gt Entity Orientation to keep the orientation marks visible on sidepanel Point nametags parent parent cur t 0 5 subcur t SubCurve esee n lt t P subcur parent ied Eee Fig 6 6 Drag the beads around and note that thet 0 end stays at bead1 If you slide bead past bead1 or vice versa the SubCurve s parameter will run the opposite way from that of the basis curve This is indicated by the changein direction of the black V 7 You can also drag the beads beyond the ends of the basis curve try it They will stay on the fair extension of midsection i e the continuation of the circle Note when dragging beads or rings once you get very far beyond t 20 or March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 80 Introducing More MultiSurf Entities SubCurves t 1 dragging may become unpredictable but you can still move the bead or ring accurately by typing in t values 8 Close the model don t save changes PolyCurve and Quick Splin
8. aflat bottom a flat slanted transom all watertight seams These properties aside from Y symmetry which is a global property of the model have all been preserved because of the rdationships we captured through our choice of entities for the model The side surface durably has its particular slant because of the relative points we used in making the chine relate to the sheer The bottom remains flat because it s a ruled surface between the chine and the chine s projection onto the centerplane The transom is flat because it s a ruled surface between a straight line the straight edge of another ruled surface and its projection onto the centerplane e The seams are durably watertight because the panel edges share common curves or are identical straight lines That winds up this second tutorial You re well on your way with MultiSurf you ve created an entire M ulti Surf mode 8 Choose File gt Exit to quit MultiSurf Tutorial wrap up Inthis lesson you have created a simple MultiSurf model You used four kinds of point entities points points in 3D space beads points constrained to lie on a curve rings points constrained to lie on a snake magnets points constrained to lie on a surface You used three kinds of curve entities curves curves in 3D space snakes curves constrained to lie on a surface projected curves curves projected onto a plane And you made ruled surfaces I
9. center the arrowhead switches direction Thet parameter of the circle is now running in the opposite direction that is counter clockwise around the circle A gain the circle begins by heading toward plane guide 6 Move plane guide to various other positions and see how thet direction is affected From its starting point this type of arc always heads toward itsthird Control point More specifically the closest point on the circle to thethird Control point has a t value less than t 5 7 Close ARC3 ms2 Arc tangent at one end 1 Open ARCS4 5 ms2 These two arcs Fig 4 built from the same 3 points have durable tangencies built into them They are displayed with their polylines which are identical A curve s polyline connects all of its parent points with straight line segments March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 78 Introducing More MultiSurf Entities Arcs p3 Z att 1 Arc tangent at point e p2 polyline pt att 0 X Arc tangent at point3 end Fig 4 Arcs4 5 ms2 2 InTools gt Options General Auto Orientation click the All selected entities radio button 3 Click E Select gt All or lt Ctrl A gt to select both curves and the Points and turn on Point nametags Both curves have the same orientation t 0 is at pl 4 i View Nametags Curve to view curve nametags arc4 the Type Arc tangent at point1 end arc is tan
10. in that order 5 g the one with the cyan control curves gt B spline Lofted Surface or Insert gt Surface gt B spline Lofted Surface OK to accept all defaults A Mirrored Surface of this B spline Lofted Surface will also end normal to the plane and therefore make a smooth join with the first surface 6 With surface1 in the Selection Set 7 the one with the all blue boundary gt Mirrored Surface or Insert gt Surface gt Mirrored Surface OK to accept all defaults Fig 14 This should match TAN SURFACE2 ms2 Fig 14 8 Close the model don t save changes Tangency Between Two Arbitrary B spline Lofted Surfaces This final Tutorial 5 example demonstrates how to make two arbitrary B spline Lofted Surfaces tangent to each other To build a durable tangency relationship we ll use two Relative Curves the second based on mirrored endpoints of the first March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 103 Building Tangency with B splines Tangency Between Two Arbitrary B spline Lofted Surfaces 1 File gt Open 28URFACES ms2 from Tutorial Files a 2 toshow CurveNametags To give you an idea of where we re headed curvel and curve2 will be the edge control curves for one B spline Lofted Surface and curve3 and curve2 will be the edge control curves for another We ll begin by making a Relative Curve to control the tangency of the upper surface to be Th
11. A eroH ydro Inc M arine Tutorials Version 8 0 March 2011 Copyright 1998 2011 AeroH ydro Inc Portions under U S Pats 5 581 672 5 627 949 5 856 828 Australia Pats 659 919 672 944 Portions copyright c 1998 Chris M aunder AeroH ydro Inc PO Box 684 54 Herrick Rd Southwest H arbor M aine 04679 USA voice 207 244 4100 fax 207 244 4171 support aerohydro com www aerohydro com MultiSurf is a trademark of A eroH ydro Inc Other brand or product names are trademarks or registered trademarks of their respective holder This manual was produced using Doc To Help by ComponentOne Inc Contents Introduction 1 v p x E 1 Using the Onlime Tutorial Siisera a a aa aa 1 Takinga Break munnen a A A rerrerr peer pre 2 Fileand folder locations inana e n en in re el a is 2 If Your Screen Doesn t M atch Our Instructions ssssssessseseeeee nennt 2 Some Basic Terminology esses nnne enne tnnt tnter trennen treten enne 3 MOUISIING MM M 3 Selecting Choosing Picking Going to sesssssseeeeenenenn enne 4 Typeface and Symbol Conventions esses enne nnne nnne 4 TNE FOULES aea aa aaa e eaa E a aa TEE Oa eaa E AEEA eaa A A AA ANE R E 5 TrOUDIESNOOUMO sisia aereas aie E e a EAE Aaa E A EERE A A A E EE O E E 5 Keyboard Doesn t Respond essent neret trennen tne 5 Can t Select an Entity on the Screen 5 Drawing Disappear Sas
12. centerline pre selected lt OK gt This should match our distribution model DEMODK2 M S2 MultiSurf lofts the surface as an arc in the lofting direction 7 Turnon the Symmetry Images F5 and rotate the model so you can see how the deck joins its image smoothly across the centerplane Fig 19 8 Turn off Symmetry Images Because we used Type Arc tangent at curve 3 end the surface e does not pass through its control curves the way the surface hull does e isarc sections in the lofting direction e ends normal to the centerline or phrased another way is tangent to a ruled surface between curves 2 and 3at curve 3 Since the the outboard edge of deck is made using the edge of the hull surface this is a watertight join and will remain so even if changes are madein hull and or deck For example 9 Look atthe D or lt Shift X gt view the bow is now pointing toward you 10 Zoom to Fit 11 Click to select hull 12 Change visibility back to just u constant turn off Boundary lines Fig 21 left 13 lt G gt to turn on Grid 14 Use Pan to movethe model to the right so you have some editing room to the left outboard of P21 15 m Orthogonal Dragging on 16 Drag P21 outboard a foot or so Fig 20 right This should match our distribution model DEMODK3 MS2 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 71 Interacting with Models Tutorial wrap up
13. 2 Create a rectangular surface in the plane of the cross section Two of the opposite corners should be the ends of the cross section curve See below 3 Make a PolyCurve from the cross section elements 4 Project the PolyCurve onto the planar surface 5 In another part of the model create the top and bottom profile curves They might be imported as well 6 Create the same movable surface as we did in the above exercise 7 8 Place a Copy Snake on the movable surface based on the projected snake on the stationary surface Confusing We hope not If so please give us a call The image below right shows one modification Between 2 parent magnets a line snake yellow was inserted On the snake 2 Rings blue were placed with Quick Points Tools Adopt Children was used to replace the old magnet parents with the rings This is to create a durably straight section in our B Spline Snake Finishing up Show Hide Show All and View Modify ZoomtoFitor ME and f Drag the Bead on the upper profile The whole construction should move along Select the cross section curve and the moving bead on the top profile Insert Surface Procedural Surface Name Spa OK March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 156 Procedural Surface Tutorial Finishing up Looks good Just some final thoughts and we re done Thecross section curve divisions should be changed to 8X16 Select the Spa surface and see how the orienta
14. 2011 AeroHydro Inc Marine Tutorials User s Guide e 177 Working with Components Paint job 4 TheResolving Names dialog reports 4 name conflicts so type in the prefix p lt OK gt 5 Edit gt Attributes and put the paint component on layer 8 6 Click the a button or press lt p gt to switch to perspective view if you are not already there To get rid of some of the clutter press 3 to hide the points and go to Tools gt Options O and in the Display tab uncheck Display mesh lines lt OK gt That s alittle better In order for this to look really good we will haveto create one more SubSurface for thetopsides and then hide hull 7 Select hull and 4 Edge Snake Surface edge u 0 lt OK gt 8 Select SubSurface pboottop and 9 to Show Parents 9 Putthenew Edge Snake and the Intersection Snake pn1 the top of the boot top in the Selection Set 10 e gt SubSurface Insert Surface SubSurface lt OK gt 11 Select hull and hide it This should match our distribution model COM PBT7 M S2 And guess what If you don t likethe color all you need to do is 12 Select the painted bottom surface pbtm paint 13 Edit Attributes and change color to whatever you want Presto Wouldn t it be niceif it were that simple to repaint a real sailboat Painting another boat Before we quit here since we havethe paint out let s paint the hull of our lobsterboat as well so you can seethat you real
15. 9 View gt Nametags Point 2 Put points pt1 through pt7 into the Selection Set In this instance if you drag a box around all of them they will all end up in the Selection Set in order March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 94 Building Tangency with B splines B spline Curves The Endpoint Tangency Property It s important for a B spline Curveto select the points in spatial order it happens in this case that they re named in sequential order but this won t always betrue 3 M gt B spline Curve or Insert gt Curve gt B spline Curve OK to accept all the defaults Now we ll make lines between the end and next to end control points to help visualizethe end tangencies 4 Put ptt and pt2 into the Selection Set 5 Line OK to accept the defaults 6 Select pt7 and pt6 7 Press lt F4 gt to make another Line Fig 1 The ends of curvel are tangent to linel and line2 This is one of the tangency principles of a B spline Curve itis tangent to the line between its end and next to end control points This should match our distribution model TAN GENT2 ms2 p Note that a B spline Curve does not pass through its control points except its end ones but acts as if attracted to them or attached to them with springs 8 Drag one of the interior non end control points around and watch how the curve responds 9 Undo any changes you made in step 8 The
16. 9 Move p5 down to 27 0 4 This leaves 3 interior control points in a line The Degree 2 B spline Curve still has a straight section from the midpoint between p and p3 to the midpoint between p3 and p4 The Degree 3 B spline Curve gets quite flat near p3 curvature is zero at one point but none of itis completely straight because only three of its control points arein a Fig 15 N Fig 16 AeroHydro Inc Marine Tutorials User s Guide 87 Introducing More MultiSurf Entities B Spline Snakes line Fig 16 10 Look at the curvature profiles of type2 and type3 again B spline Curves are especially useful when designing curves that need to have straight portions or curves that require precise control over end slopes Close the model B Spline Snakes 1 Open BSNAK1 3 MS2 This model has three B spline Snakes of Degrees 1 to 3 each using the same six control points magnets on a translation surface Fig 17 You can see how the B spline Snakes share many of the properties of B spline Curves Fig 17 e they approximate the shape of the Polyline snake joining the control points e they start and end at the end control points e thehigher the type the stiffer and smoother the spline 2 Go ahead and drag the magnets around watch how the snakes respond Create your own B spline Snake with a Quick Spline 3 Select the surface 4 Turn on Quick Spline Mo
17. Can t Select an Entity on the Screen If you dick on an entity to select it in the drawing and it won t select check your filter settings e onthetool bar filter buttons for the classes of entities and for Current Layer Only e inthe Select Menu Class Filters Visible Hidden Both Current Layer Filter Reset filter s if need be N ote that while Select gt Reset All Filters immediately makes all entities selectable it does reset all filters to their default settings Whatever you do to your filter settings to get at the entity you want to select you might want to check back through the tutorial and make sure that your settings match the instructions to avoid further confusion as you continue following the tutorial Drawing Disappears If you are changing the viewpoint rotating panning zooming and your model disappears do aZoom to Fit i or View gt Modify gt Zoom to Fit or lt F gt Error Messages If the MultiSurf Errors window opens and reports an error you have these options the entity in question will be displayed in the Entity Manager with a 9 If the entity appears in the Selection Set or Available Entities panes it will also display a 9 e Tofixan entity that s in error select it and then edit it double dicking the entity in the Error window will select that Entity and show theattributes in the Property M anager e To getrid of an entity that s in error that does not already have children select
18. Oh Good thing we checked These 2 B spline Graphs control the guide curve and taper of the mast Sweep Surface We get the deck as well That s OK just remove it again 4 Select gt Parents gt 1st Generation one more time Just the deck comes up so we areall set Remove the deck one last time from the Selection Set Now wecan save the component March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 175 Working with Components Rigging 5 File Component Save 6 The Component Save dialog says the component will consist of 35 objects and needs one support Type in the ID message mast boom and rigging from 24 sloop then lt OK gt 7 Giveitthefilename COMPONENTRIG and put it in the MultiSurf Tutorials folder Rigging the tutorial boat 1 Return to the COMPONENTBOAT window 2 Preselect the deck 3 File gt Component gt Load gt COMPONENTRIG MC2 4 Inthe Resolving Parents dialog Arc Lofted Surface deck should be the support lt OK gt 5 In the Resolving Names dialog no name conflicts are indicated so dick lt OK gt 6 Zoom to Fit Now there s one wee problem here the mast and boom are too short for our 30 ft boat We can fix that by scaling the component while it is still in the Selectiojn Set 7 Edit gt Transform gt Scale and set all 3 scale factors to 1 25 that s 30 24 OK and OK to the Non Transferable Entities box 8 Zoom to Fit again to see the whole picture That s much better We ll k
19. PAO CO DH D S 19 Save 2D drawing files s eesssesssieseeee eene nnnn nnne tn etna trennen tete tenete 19 View lines plan RE 20 Symmetry IMAJ ES iiini di aeiiaaie aiaa a a a Eai ataa E aaea aai 21 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e ii Contents E bre iere 21 View dependengy eisiisseseseeseesetn enne tn tns tren athens tranne trate tn sinant strana tetn etes nenne trenes 21 Multiple graphics views of a model sse nennen nnns 23 Moving d cablfirosstosciree th Rec e elocutio Ln Nc erect 24 Moving a bulkhead cit e rehenes ire vedere viens 25 Tutor al EeU 26 Making a Simple Model 29 OVervieWox uno eec terere tuo Cost rere crer rere A AAG 29 Beginning anew model v dte eumd er e e a d een 31 Check programysettirigs eisai 2 eiit nid on tene ed ed ue D tilts 32 Making the side surface ssssssssssssseseeeeenne nennen trennen tnter ennt etn tnter 32 Creating the Sheer Curve Quick Spline essen 33 Editing the Curve sssssssssssssssseseeese enne ennt nennen nnne trennen trennen nsns 33 Making the chine another C spline Curve esee 35 Creating a Relationship sessi ennt tne nnne nes 36 Creating the side surface a Ruled Surface senes 37 Show and Hide Entities to Simplify the display
20. and X 1 Z 2 Return to Select Mode and turn off Grid In preparation for our next action note the Grid scale shown on the status line 1 0 This means the smallest grid squares are 1 unit on each side The heavy grid lines are at 10 unit intervals We re going to stretch the bow out to the right so there s more bow overhang a straighter stem and less freeboard making the boat look more racy We can do most of this by moving P11 Since we ll be selecting and moving points for a while here we ll make it so only points can get through the filters EM Le E 6 Click and Y to turn Point filter on and all other filters off x 7 Click to turn on Point Nametags Move point P11 We re going to drag P11 Here s a tool that can help 1 GototheTools Options Dragging tab and under Snaps Set X Y and Z increments to 0 1 This will make point coordinates snap to the nearest tenth 0 1 when you drag a point 2 Drag P11 about 12 ft forward and 4 ft down to X 1 2 Z 3 2 usethe Grid and the dynamic coordinate display on the status line for reference Notice that the coordinates snap by 0 1 increments If you miss your mark you can drag the point again until the location looks right or until you get the coordinates you want Or you can use the Property Manager and type coordinates into the dialog box Fig 4 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 56 Interacting with Models
21. graphics views multiple 23 Grid 90 Grid View Menu axial orthographic views only 90 H Heel hydrostatics 130 Help 16 Hide Selection Set 39 hull skin C lofted component 162 hulls C spline Lofted Surface with B spline Curve master curves 110 planing 141 powerboat 115 preference for type 3 B spline Curve master curves 143 radius chine 119 round chine 119 row boat 31 sailboat from components 160 Tangent Boundary Surface 115 H ydrostatics Tools M enu 130 ID identifying message 31 Insert Menu Copy Last Insert M enu 95 Insert gt Contours 129 Insert gt Copy Last 47 Insert gt Plane 136 Insert gt Quick Point M ode 46 Insert gt Wireframe 21 Invert filters 42 March 24 2011 K keel with a durably straight portion 116 keds bulb 120 component 168 sailing yacht 120 with straight portion 116 keyboard doesn t respond 5 L latitude adjusting 12 definition 11 Line 58 95 Line Snake 47 lofted surface B spline ending normal to plane 102 making 2 B spline Lofted Surfaces tangent to each other 103 longitude adjusting 12 definition 11 look point adjusting 12 Magnet dragging 88 magnets definition 45 master curves preference for type 3 B spline Curves 143 menu right click on entity 22 message identifying message 31 Mirrored Curve creating 101 using to make G2 joins 101 Mirrored Point creating 101 using to make tangent joins 101 Mirrored Surface creating 103 tangency
22. with a Z little modification master curve M C1 has been moved a little off center The yellow rectangleis the plane centerplane The magenta curve profile has been made by projecting MCI perpendicularly onto the centerplane The cyan ruled surface half siding is formed by joining MCT to profile 2 Select MC1 X Fig 20 3 amp or F10 or View gt Modify gt Zoom to Selection 4 Zoom out to about radius 20 5 Now change MC1 by dragging one or more of its points 6 e you can see that profile magenta continues to be the projection of the modified MCT cyan 7 Close the model don t save changes Tutorial 4 wrap up In this tutorial we focused on introducing more of the MultiSurf curve snake and surface entities A great deal of the power of MultiSurf comes from the richness of entity types available allowing you to usethe entity that best fits each purpose In the next tutorial we ll introduce more entities particularly surface entities in the context of their usein various kinds of marine designs March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 91 Introducing More MultiSurf Entities Tutorial 4 wrap up March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 92 Building Tangency with B splines Overview In this tutorial we will demonstrate the end tangency principle of B spline Curves and show you how to create durable tangency relationships bet
23. 048 23 Now dick on the points in sequence to make the indicated adjustments March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 136 Marine Design Examples A Planar Sheerline Pel up 114 to Z 2 124 P51 up 069 to Z 2 059 P31 down 050 to Z 2 290 P21 down 048 to Z 2 585 Fig 33 sheer and Plane a0 a e e 2 24 Select sheer and View gt Display gt Curvature Profile again Don t forget to turn Curves filter back on Close e I MH C spline Curve sheer Fig 34 Fig 33 In this view the curvature profile Fig 34 shows us the sheer is still not quite straight Why not Well clearance measured distances perpendicular to the plane which is inclined on the other hand we moved the points vertically so we d expect some discrepancy The next step would beto run dearances again Since you most likely have the hang of dearances we ll just share our results Pel 002 P51 001 P31 001 P21 001 which isn t worth fussing about so we won t fuss This should match our distribution file CLFT7X4B M S2 This method utilizes an important C spline property If all the control points liein a plane then the entire curve does too 25 Watch the Curvature Profile display as you move up and down in Latitude and you can see how the sheer can go from concave at Lat 0 0 deg heel to convex at Lat 40 40 deg heel without being a mi
24. 1 Click sheer to Edit in the Property Manager 2 Turn on tickmarks by clicking in the check box 3 Click lt OK gt to accept the edit Thetickmarks may be easier to see if you remove the line from the Selection Set so that the lineis no longer bold Every MultiSurf curve curve line or snake has a parameter we call t which varies over the range of Oto 1 For any curve you can seethe distribution of t along its length by turning on its tickmarks found in its Edit dialog on the Display tab Tickmarks are displayed at the ninet values t 0 1 0 2 0 9 When you select a curve orientation marks are displayed that show e A circle around the end where t 0 An arrow at t 0 5 pointing in the direction of positive t In the Tools gt Options General tab under Auto Orientation you can select when these marks are displayed You can also force any particular entity to keep its orientation mark by selecting the entity and then dicking or View Entity Orientation Let sturn off thetickmarks 4 Select sheer to edit in the Property M anager 5 Turn off tickmarks lt OK gt March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 44 Making a Simple Model Adding thwarts Dragging a bead Now to our oarlock The default location for any added bead ist 0 5 Let s play with this bead for a moment to see how it works 1 Drag the bead several places along sheer While you are dragging watch the dynamic t val
25. Components The beginning model On the View menu Status Bar should be ON preceded by a checkmark to turn an option on simply dick on the menu item or if it has a box next to it dick on the box All Toolbars should be ON To check this dick on Toolbars The resulting list should have all of its boxes checked On the Tools gt Options General tab Set Rotation Constraint to Z axis vertical mode On the Tools gt Options Dragging tab All the snaps should be ON Prompt after drag should be OFF no checkmark A few memory aids We assume that you have been following the tutorials in order and that by now you are familiar with using the settings menu choices and toolbar buttons and we will direct you to them less frequently than we did in the earlier tutorials We encourage you to use them as you see fit as we move along Here s a little collection of reminders just in case To select an entity in the drawing click it If your choice is ambiguous more than one entity is in the center box of the cursor you will need to answer the Which Entity dialog To add an entity to the Selection Set lt Ctrl gt click it To remove an entity from the Selection Set Ctrl click it To clear the Selection Set click x or click in the model background To Edit Definition of an entity you can double click it If it is an ambiguous selection you can select it and use or use Edit gt Definition from the menus The nametag but
26. Grid Which Entity dialog box March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 30 Making a Simple Model Beginning a new model Beginning a new model All the introductions over what kind of model shall we create We may not be ready to go to sea yet but it would be fun to row around in the harbor We ll want a rowboat Let s make one Whereto start Well if our overall or long term goal is a rowboat you might think of a flat bottom a slanted side and a slanted transom as short term goals Fig 1 An underlying objectiveis that all the seams be watertight A LITT SILL pa TATTLE Fig 1 Wireframe of the rowboat we will create 1 Start MultiSurf by choosing Start gt Programs gt A eroH ydro gt M ultiSurf or using Windows Explorer the program filename is WindSurf EXE 2 Click D or press lt Ctrl N gt or choose Files New The program opens a window displaying the coordinate axes 3 Press lt O gt or choose Tools gt Options 4 Under Rotation Constraint dick on theZ axis vertical radio button Since our entire rowboat model will be symmetrical with respect to the Y O plane we can take advantage of MultiSurf mirror symmetry images M aking our model with Mirror symmetry means we only need to create one half of the total model When Symmetry Images is turned on during model construction the rest of the boat appears for viewing Fig 2 lil tines Fig 2 Theone half of the rowboat we
27. Models Shift model 5 Edit gt Transform gt Scale X scale factor 2 1 lt OK gt lt OK gt 6 to see the whole boat it is now stretched along the negative X axis with its bow toward positive X Fig 2 right Some designers prefer this orientation Fig 2 A zero scale factor is also permitted but is not often a useful transformation 7 Edit gt Transform gt Scale Y scale factor 0 zero lt OK gt lt OK gt 8 Look atthe X and e lt Z gt views and you can see the mode has been completely flattened out onto the Y 0 plane because all Y coordinates have been multiplied by zero 9 Atimes to get back to the original DEMO model you ll know you are back at the beginning when the toolbar undo arrow grays out If you prefer just dosethe file without saving and re open it 10 Return to Y view and to see the whole boat again Shift model Another simple change is to shift translate the model to a new location in the global coordinate system For example you might prefer to have X measured from the middle of the waterline instead of the forward end of the boat For the DEMO model this requires a negative shift of all X coordinates Or you might like to have Z measured from a base plane at the bottom of the keed instead of from the design waterline For DEMO this requires a positive shift of all Z coordinates To do the shift that lets us measure X from the middle of the waterline we need to f
28. Reshape the stem When you drag points the motion is all in the plane of the screen In this case since we are using the Y gt projection the dragging affects only the X and Z coordinates LLLI Fig 4 Now notice a few things about the updated model e B spline Curve MCT the curve that defines the bow has changed to conform to the new position of P11 This is one of the properties of a B spline Curve it always starts at its first control point You could move P11 anywhere you like and MCI would always reach the new position e C spline Lofted Surface hull has changed to conform to the new shape of MCI This is one of the properties of a C spline Lofted Surface its v 0 edge is always along its first master curve You could change M CT to any shape at all and the surface would still be attached to it e B spline Curve MCI has developed an inflected shape that is a little like a clipper bow not quite the straight stem intended This is because so far we have only moved P11 we now have to work on P12 Move point P12 1 Click Er or Tools gt Options Dragging Snap Clear All to turn all snaps off 2 Click 4s or F7 next to on the same toolbar to turn on Orthogonal Dragging Orthogonal Dragging constrains movement to either vertical or horizontal in relationship to the plane of the screen In Orthographic view this means Mul
29. We also placed magnets on deck for the three chainplates red and for the inner forestay pelican hook also red Fig 23 We made a point truck magenta using step as its support 38 ft up and 76 ft aft This builds in a 296 rake mast is a yellow line from step to truck On mast we placed three beads gooseneck lower bead and upper_bead all cyan backstay is a line running from P41 the quarter the aft corner of the deck to crane a point 375 ft aft of truck We favor double backstays based on painful experience headstay is aline from truck to P11 at the point of the stem forestay is a line from upper bead on the mast to pelican on the deck The boom spreaders and jumper strut are lines from the beads on mast to the spar tips which are points off their respective beads March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 127 Marine Design Examples Offsets and Hydrostatics Thelower shrouds arelines from lower bead to their respective chainplates The jumper stay intermediate shroud and upper shroud aretype 1 B spline Curves with t divisions 2 2 and 3 respectively All the connections in the model are durable with respect to movements of the mast step changes in mast height positions of spreaders For example 2 Select truck magenta at top of mast 3 Chang
30. Windows Start Menu dick Programs then AeroH ydro then MultiSurf or in Explorer double dick the program WIN DSURF EXE in the MultiSurf folder Please refer to your Windows manual if you need further assistance The program starts up what do you see You should see the MultiSurf title bar a menu bar and a toolbars at the top of your screen and a status bar at the bottom You will also see the Entity Manager the Selection Set Manager and the Property Manager These should remain open and can be docked around the perimeter of the workspace or moved to a second monitor The workspace holds all the windows graphics views and other displays you use for viewing the model Until you open a file there are only a few choices on the menu bar and the text graphics on most of the toolbars shortcuts for various menu choices are grayed out meaning they are inactive The status bar also becomes more helpful once you have opened a file It reports viewing data and gives you feedback on what editing operation is pending or on what menu choices and buttons do For a drop down box of menu option information dick the mouse button whilethe cursor is on a menu item You can then drag the cursor to the other menu items to seetheir drop down boxes of options Once a final menu option is highlighted press lt F1 gt for extended information from the online help file If you click and hold on a menu item you can follow the boxes until you are at
31. any additions or edits as a model file Or if you just wanted to make a changeto the component file you could edit it reselect the component objects and then File gt Component gt Save it again But we re already well on our way with our model so we won t do any of that now we ll just put this keel on our hull 5 Close the component file 6 Preselect the hull 7 File gt Component gt Load gt KEEL1 MC2 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 169 Working with Components Rudder 10 11 12 Rudder In the Resolving Parents dialog C spline Lofted Surface hull should bethe support listed OK Thereare no name conflicts in the Resolving N ames but you will need the prefix Keel OK seeFig 6 in Rudder section While the component is still in the Selection Set go to Edit Transform Scale Make sure the Only transformable entities in the selection set radio button is set then type 9 in the Transform factor for Z box Click lt OK gt to the Non Transformable Entities box in the Property Manager change layer 3 OK Clear the Selection Set Now for a rudder Saving the rudder component 1 2 Open SAILBOAT MS 2 from the MultiSurf Tutorials folder Zoom in on the rudder This rudder actually has two surfaces the main foil surface and thetip We want to grab them both plus all of their Parents back to the hull surface Here s another way to select Parents for a co
32. approach to the design of many hulls March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 115 Marine Design Examples Keel with a Durably Straight Portion 1 2 3 Open PWRB2 This chine hull uses Tangent Boundary Surfaces for both topside and bottom panels Thefocus of a Tangent Boundary Surface design is on the boundary curves Curve nametags This will identify the principal lines sheer chine keel etc Taking advantage of MultiSurf capabilities to establish and maintain connections between entities we have used dependencies here to make the connections of these curves durable for example stem chine and keel all use point A3 as an endpoint E Point nametags to identify A3 and the other supporting points for this model The topside surface has the four edge curves stem chine E sheer in the entity definition of a Tangent Boundary Surface the four basis curves have to be named in sequence around the surface The bottom surface has the edge curves A 3 keel F chine Notice that the first side A3 is degenerate i e a single point rather than an actual curve 4 View gt Display gt Ship Lines Body plan factor 2 Noticein the body plan how the topside sections transition smoothly from the flared character of the stem master curve to the convexity of the stern master curve Fig 8 Thi
33. are 3 options for proceeding from an apparent tangle You can e Start over again at the beginning e Undo until things look right then proceed forward again from that point e Use one of our distribution model files to continue the tutorial 1 Look back in the tutorial and find the most recent mention of a distribution file 2 UseFile Open to open the distribution model from Tutorials 3 Immediately File gt Save As and specify a different filename so you won t overwrite the distribution file by mistake 4 You may need to look back in thetutorial and rese some settings to what they would have been if you were proceeding with your own modd e Viewpoint standard views perspective etc e The Selection Set e Filters toolbar buttons or Select gt Class Filters Select gt Current Layer Filter e Orthogonal dragging mode toolbar button or Tools gt Options gt Dragging e Nametags toolbar buttons or View gt Nametags 5 Continue with the tutorial 6 Before you do any File gt Saves be sure your mod amp s filename is one you have specified Step 3 takes care of this Step 6 is a just in case message to make sure you do not overwrite a distribution file with changes Some Basic Terminology Mousing MultiSurf is operated by both mouse and keyboard Here is a summary of some basic mouse terminology as we use it Tem Meaning March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 3 Introduction Typefac
34. can serve as a magnet on that surface RMS root mean squared A measure of the deviation between two sets of data scientific notation See exponential notation March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 190 Glossary of Terms Working with Components wrap up selection set The selection set is comprised of the one or more entities currently selected Its basic useis you make a selection set then you tell the program what you want to do to it edit move hide use as parents for an entity sheerline Nav Arch Theupper edge of ahull surface usually the most visually prominent line on a boat SLDCRV file An ASCII text file containing X Y Z values in three columns Each line represents one 3D point and must contain three decimal values separated by spaces or tabs Can be opened in MultiSurf with File gt Import gt SLDCRV snake A curve constrained to lieon a surface spline drafting spline Drafting A thin flexible curve held in position by weights ducks used for drafting free form curves stations Nav Arch A se of longitudinal locations on a ship usually uniformly spaced also thetransverse sections at these locations stem Nav Arch Theforward edge of a boat hull Also a structural member along this edge stern The back end of a boat support or supporting entity An entity that another entity directly depends on for its shape or position E g the curve on
35. end guide and see how the curve responds Notice you can t make an arc of more than 180 degrees this way 4 File Close ARC2 ms2 Circle start center plane guide 1 File gt Open ARC3 ms2 Thisis aType Circle start center plane guide Fig 3 which is a complete circle It starts and ends at thefirst Control point start and has its center at the second Control point center In this type of arc the roles of the third Control point plane guide are to specify the plane the circle lies in and to designate which way the cirde is traversed ast runs from Oto 1 Let s explore this t direction aspect a bit 2 Click o or View gt Nametags Point 3 Select the arc full circle March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 77 Introducing More MultiSurf Entities Arcs Z Circle start center plane guide t 0 and t 1 p o plane guide start X Fig 3 Arc3 ms2 You can see that start is indeed att 0 and that the parameter t is running around the circle clockwise in the direction the arrowhead is pointing Notice also that from its starting point the circle heads out in the direction that is toward plane guide 4 Turn on View gt Entity Orientation This will make the orientation marks stay on the circle even when it is not in the Selection Set 5 Drag plane_guide approximately straight down When plane guide goes below the imaginary line that connects start with
36. entity with another or have one entity adopt all the children of the other In this case seat pos will adopt the children of ring3 For the operation to work properly we need to have both entities in the Selection Set The entity to be replaced is first in the set This order can be changed while in the Adopt Children dialog For this example we will select them in the proper order 15 Select ring3 and seat pos in that order Press lt Shift A gt or Tools Adopt Children 16 Check box to Delete old parent ring3 lt OK gt March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 47 Making a Simple Model Refining the rowboat 17 Repeat for ring4 and seat width 18 Drag seat pos to an approximate location or edit its location for a precise placement of the thwart Drag magnet1 to raise or lower all of the thwarts at once This should match our distribution model T2ROW6 M S2 Fig 8 Rowboat modd with three thwarts added H ome view Not bad Now who brought the oars Refining the rowboat Note that we planned each of the relationships we built into the model and we can change any of them at any time Actually this is a pretty big rowboat Suppose we decide now on reflection before we haveto carry it down to the water that 11 ft overall length would be big enough and we d liketo reduce the freeboards and depths in proportion Easy enough with MultiSurf 1 Edit gt Transform gt Scale All tr
37. has long been known to naval architects that achieving a pleasant 3D appearance of the sheerline and other visually prominent lines requires coordination between many views It is much less widely known that the proper coordination can be stated as a simple geometric rule besides being fair the curve should liein a single plane 1 Open CLFT7XAA The sheerline of this model has been faired in profile and plan views Let s take a look 2 Um Y and Zoom to Fit Fromthis direction the sheerline presents a concave curve 3 Hide the hull surface green 4 Select the C spline Curve sheer and View gt Display gt Curvature Profile The curvature profilefor the sheer in this view shows all negative curvature Putting yourself in bug mode may bethe easiest way to understand how the curvature profile relates to the curve itself So imagine you are your favorite bug walking on your screen in the direction of increasing t along the sheer curve not the curvature profile display As you walk you arealways curving to your right which indicates negative curvature For more details on reading curvature profiles see Editing Models Fairing Curves 5 Up arrow to Lat 40 From this direction the sheerline presents a completely convex curve The curvature profile shows this as all positive curvature the bug is always curving to the left Fig 28 b _C spline Curve sheer Fig 28 A Planar Sheerline AeroHydro I
38. her a mast and rigging would be useful Let s go pirate some from a 24 sloop model Saving the rig component 1 Open SLOOP2 MS2 from the MultiSurf Tutorials folder To get you a bit oriented The mast and boom are Sweep Surfaces mast attaches directly to the deck with the magnet m0 mO is the bottom end of the Line sail track which serves as the path specified by bead eO for the mast Sweep Surface The lower side stays also attach directly to the deck with the magnets m2 m3 and m4 Since these M agnets are based on mO at the intersection of sail track and the deck they will keep their proper relationship to the mast if the mast is moved The fore and back stays attach indirectly to the deck via rings r2 and r3 on thev 1 Edge Snake ctr which runs down the centerline of the deck Thus you can drag the bottom ends of the stays forward and aft and they will remain on the centerline of the deck First let s check the orientation of the deck 2 Select the deck u goes from bow to stern and that s what we need whew after all that introduction it had better bel Let s select the objects for our component 1 With the deck still selected choose Select gt Children gt All Generations to add 33 objects to the Selection Set 2 Wedon wantthe deck so remove it from the Selection Set We had better check in the other direction as well Parents 3 Select gt Parents gt 1st Generation
39. is a special kind of point constrained to lie on a curve in this case the curveis aline that runs along the X axis therefore the bulkhead can only move forward and aft not vertically or sideways the edge curves of the bulkhead are special curves that must lie on the deck and hull surfaces therefore when you move the bulkhead the bulkhead remains watertight We don t expect you to fully understand the way these parametric models work at this point This is the show part of our show and tell As you progress through the tutorials you will gain understanding of the many kinds of relationships MultiSurf maintains We will revisit these three models in Tutorial 6 and explain them more fully after you ve learned some of the basics This winds up our first tutorial 8 File Exit to quit MultiSurf Click No when the program asks if you want to save changes Tutorial 1 wrap up In this lesson you have learned many different ways to view a model and a number of other important ideas for using MultiSurf effectively You have also seen some of the power of relational geometry March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 26 Views and Viewing Tutorial 1 wrap up March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 27 Making a Simple Model Overview Now that you know from Tutorial 1 how to navigate in MultiSurf and how to choose and control views let s jump right in and mess around We ll m
40. it in the Entity Manager or the Available Entities M anager then Edit gt Delete it or press the Delete key e You also can Undo an error if you have just created it If the error occurred during entity creation Undo will undo the entity creation there will be no new March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 5 Introduction Troubleshooting entity in the model If the error occurred during entity editing Undo will undo the edit the entity will remain in the model March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 6 Views and Viewing Introduction In this tutorial we introduce you to the basics of navigating in MultiSurf induding how to make choices and enter information control the view view the model data in several formats export 2D and 3D files In the beginning we use very explicit instructions down to the last MultiSurf mouse dick Later on when we assume you arefamiliar with a particular menu choice or dialog we give you more general instructions Entity introductions Wireframe Concept and Function introductions n Ro YY R X N RN ooo cursor shapes Arrow lt Ctrl Arrow gt Ctrl402 lt gt F1 F5 F8 10 gt Home P Pg Downs Pg Up Shift X Shift4Y gt lt Shift Z gt X Y gt Z gt Shortcut Keys Drag a point Edit2U ndo Expand to Selected Entity in Entity M anager File gt Close gt Exit gt Open gt
41. ll create left the entire model with symmetry images right 5 Choose the Model tab and under Mirror Symmetry click the checkbox for Y 0 plane 6 UnderHomeView set Latitude to 10 leave Longitude at 60 and Tilt at O 7 Inthe Model Comment box type in an identifying message for this model rowboat example for tutorial 2 8 In the Model Units tab set Units to Feet Pounds in the drop down box Click lt OK gt Before we proceed from here let s name our file March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 31 Making a Simple Model Making the side surface 9 Choose File gt Save As 10 Giveitthe filename ROW and put it into the Marine Tutorials folder These settings should match the settings in our distribution model T2ROWT1 M S2 11 If you get a warning that ROW1 MS2 already exists and the query to replace existing file just click Yes all this means is that someone has already run the tutorial and created a ROW 1 M S2 file which you are now going to overwrite with your own ROW1 M S2 Check program settings Before we go on let s check some other program settings If we don t all start with the same set now what we say and what you see as we proceed will be different aargh The set we use are the program s initial defaults but since the program is customizable you may find differences if you or someone else has already worked with your program This is what you should have On the View
42. model 31 W watertight seams 39 43 whed pan 13 wheel rotate 13 AeroHydro Inc Marine Tutorials User s Guide e 200 Index wheel zoom 13 Which Entity box 82 Window Tile Horizontal 129 X XYZ Ring 47 Z Z axis vertid mode 11 Zcg 130 zoom in out with mouse 14 zoom to area with mouse 14 Zoom to Area 17 Zoom to Area click centers the model at the dick point 65 Zoom to Selection 18 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 201 Index March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 202
43. most engineering drawings parameter A dimensionless real number which labels one point along a curve or one of a pair of real numbers which label one point on a surface In MultiSurf curve parameters are called t and surface parameters are called u and v all nominally run from Oto 1 but have meaning outside this range March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 188 Glossary of Terms Working with Components wrap up parametric lines The curves on a surfacethat result from holding one of the surface parameters u or v constant and varying the other parent entity An entity that another entity directly depends on for its shape or position E g the curve on which a Relative Curveis based one of the control curves of a lofted surface the surface from which a SubSurface is built Same as support entity perspective view A perspective view maps a 3D scene into a 2D screen image using projection lines which converge on an eye or camera point This is a natural view which is similar to a visual image or a photograph plan view A vertical orthographic projection of a scene from above or below Nav Arch A vertical orthographic view of a hull displaying the waterlines plane An unbounded flat surface In MultiSurf there are default planes X 0 Y 20 and Z 0 that consist of the points that define X20 Y 20 and Z 0 respectively and planes with any orientation that you can create in various ways plan
44. move aft again 12 Thistimedouble click on the last point p1 to end the spline 13 Edit the curve to renameit crown Hint Renaming can also be acomplished by using the slow double click method in the Entity M anager This method of re naming is a Windows standard operation Fig 18 crown Fig 18 14 Reset the Quick Spline mode default back to B spline Create the deck surface In order to create the deck as an Arc Lofted Surface we first need to create a curve on hull that the deck can use 1 Turn off Point Nametags and select the hull surface 2 gt Edge Snake or Insert gt Snake gt Edge Snake Name hulldeck Surface edge u 0 Surface hull pre selected lt OK gt Next we need a curve to terminate the deck surface at the centerline To do this we ll project crown onto the Y 0 plane 3 Select the C spline Curve crown a B gt Projected Curve or Insert Curve Projected Curve Name centerline Curve crown pre selected Mirror Y 0 select from the Entity M anager lt OK gt 5 Pre select hulldeck crown and centerline in that order as master curves 6 gt Arc Lofted Surface or Insert Surface Arc Lofted Surface March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 70 Interacting with Models Add a deck surface Name deck Type Arc tangent at curve 3 end Control curves hulldeck crown and
45. s even better Fig 12 but still not exact zoom in on a corner F and you will see then S or to return to this view There s no magic way to make divisions on a Degree 1 C spline Curve break precisely at the control points Fig 12 The Degree 2 C spline Curve red is a smoother curve made up of parabolic arcs March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 85 Introducing More MultiSurf Entities B spline Curves The Degree 3 C spline Curve magenta is still smoother but stiffer or springier so it bounces more in passing through the points Instead of descriptions we have atool for analyzing curvature called Curvature Profile By selecting a curve and showing its Curvature Profile you can see details about its curvature that you cannot discern by looking at the curve alone 5 With type still selected choose or View gt Display gt Curvature Profile This shows that the curvature is all concentrated in spikes at the sharp bends which occur at the data points 6 Select the red C spline Curve type2 7 again Here you can seethe discontinuities in curvature that occur at the knots wherethe three parabolic arcs join 8 Select the magenta C spline Curve type3 9 E one moretime Here you seethe curvature distribution is smoother in fact it varies continuously along the curve This degree of smoothness is characteristic of Degree 3 spline curves 10 Move the control points around and
46. see how the curves respond Be wild make the curves cross themselves even 11 Close the model DON T save changes B spline Curves If you have been following the tutorials in sequence you will have run across a B spline Curve and a B spline Snake while using Quick Spline Mode We have not ye talked about them but we do here A B spline Curve is a free form curve that is shaped by a series of control points It starts and ends at the first and last control points but unlike a C spline Curve in general it does not pass through the other interior control points instead it imitates the Polyline joining the control points A B spline Curve can have any number of control points B splines as curves snakes and lofted surfaces can be of any integer type desirable greater than zero Degree 1 linear Degree 2 quadratic Degree 3 cubic etc although degrees higher than 3 are rarely used 1 Open BSPL1 3 MS2 This example uses the same control points and the same three types Degree s 1 3 as CSPL 1 3in the C spline Curve example above The Degree 1 B spline Curve cyan likethe Degree 1 C spline Curve is just a Polyline joining its control points in sequence Note that unlike for a Degree 1 C spline Curve the display for a Degree 1 B spline Curve readily breaks at its control points all you need to do is make t divisions x t subdivisions 2a multiple of number of control points 1 March 24 2011 AeroHydr
47. should be made between curves of similar t distributions Tickmarks concentrated in areas of high curvature for B splines and C splines Tickmarks evenly spaced for Arcs Lines and PolyCurves View gt Entity Orientation View gt N ametags Curve In this lesson we ll be opening a series of simple models and discussing and editing them Each time we dose a model in preparation for opening a new one MultiSurf March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 75 Introducing More MultiSurf Entities Arcs will ask if you want to save the changes we ve made Respond No i e do NOT save That way the sample models will be intact if you or someone else wants to repeat part of the lesson or if you want to look at the model files used for the examples in the Entity Descriptions section of the manual MultiSurf Tutorials Introduction contains information about taking a break typeface and symbol conventions and trouble shooting So Start MultiSurf and File gt Open switch the folder to X Examples then open ARC1 ms2 Check program settings Arcs Let s check those program settings and make sure we re all starting with the same ones the initial program defaults This is what you should have On the View menu Axes and Status Bar should be ON preceded by a checkmark to turn an option on simply click on the menu item or if it has a box next to it click on the box All Toolbars except Marine View Orientation should
48. stations at the extreme ends of the hull MultiSurf will sort all the stations into ascending order of X position 3 Insert Contours Name xbow Mirror Surface X 0 Index of first contour 0 Index of last contour 0 Signed distance from Mirror Surface to 0 index contour 04 Contour spacing 1 Surfaces to cut hull March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 129 Marine Design Examples Offsets and Hydrostatics OK 4 Look in the Offsets window Note this forward most contour is very small barely if at all visible To see it 5 Zoom in on the bow 6 Zoom to fit the Offsets image so you can see all the contours again 7 Go back to the graphics window 8 F4 or Insert gt Copy Last Name xstern Mirror Surface X 0 Index of first contour 0 Index of last contour 0 Signed distance from Mirror Surface to 0 index contour 30 Contour spacing 1 Surfaces to cut hull lt OK gt Saving offsets 1 Back in the Offsets window right click in the Offsets window gt Export OFE For filename take the default lt Yes gt to replace an existing file This saves the offsets data as DEM O OFE a file which can be used as input to the AeroH ydro Offset File Editor OFE x H ydrostatics H Y DRO x Velocity Prediction AH VPP x and Slender Ship Resistance SSR programs Hydrostatics 1 Tools Hydrostatics Note this option is available only when you arein the Offsets w
49. that matches the old shape pretty well Fig 43 You can make some more adjustments to get it closer We ended up at P32 30 000 3 500 0 723 P33 30 000 3 150 0 120 Notice that the curvature profile of M C3 has become much smoother still showing the most intense curvature in the middle but now a gentle dish bottomed valley instead of a crevasse Fig 44 x 4l B spline Curve MC3 Fig 44 Now repeat the process with M C2 15 Select MC2 and View its Curvature Profile Fig 45 B spline Curve MC Fig 45 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 145 Marine Design Examples Preference for Degree 3 B spline Curve Control Curves 16 Change Degree for MC to 3 17 Drag P22 down about O 6 ft and a little outboard to about Y 5 08 Z 0 01 18 Drag P23 outboard about 1 0 ft to about Y 4 62 We ended up at P22 15 000 5 086 0 014 P23 15 000 4 620 0 870 Again the Curvature Profile is much smoother Fig 46 B spline Curve MC Fig 46 And similarly with MCT 19 Switch to Y view and Zoom to Fit so you can find MCT 20 Select MC1 and View its Curvature Profile Fig 47 21 Zoom in on MC1 Fig 47 22 Change to Degree 3 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 146 Marine Design Examples Preference for Degree 3 B spline Curve Control Curves 23 Pull P12 toward
50. the choice you want Read the status bar for information Release the mouse button to make that choice or if you don t want to activate a menu item drag the cursor off the item before you release the mouse button For toolbar button information hold the cursor over the button and read the status bar or the pop up tool tip Open a model file Okay now we re going to open a model file Click E or press lt Ctrl O gt or choose File gt Open March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 8 Views and Viewing Entity Manager A standard Windows dialog box appears but since some of you may not be familiar with how it works we ll do an introduction here If you re already familiar with Windows dialog boxes jump below to Continuing Dialog box introduction The Open File dialog box lets you specify the file you want to open and the path drive and folder directory to get to it Look in C3 Marine Tutorials e c a Al xl i 2CABINS MS2 i CSPL1 3 M52 LidHandle2 ms2 ii Shape a BLFT5X4 MS2 a Heart2 ms2 li LidHandle3 ms2 a Shape ia BSNAK1 3 M52 a HeartStart ms2 Loop1 ms2 f Shapes ns BSPL1 3 M52 ii Jet MS2 Loop2 ms2 Shape s BLLKHD1 MS2 s LidHandle ms2 s PolyCurve1 ms2 s Shapet f CLETSX4 MS2 i LidHandlet ms2 M Projcrvi ms2 Shape gt File name Files of type SurfaceWorks Models ms2 Cancel 7 The file we want
51. to load should bein the Marine Tutorials sub folder of the MultiSurf folder At the moment the folder shown in the Look in field should be Local Disk C To move to the Marine Tutorials folder double click in turn the folders that lead to the tutorials folder If you installed using the default location these folders would be Program Files AeroHydro MultiSurf Marine Tutorials Now the Look in field should report Marine Tutorials Continuing The list of M S2 files in the Marine Tutorials folder should include DEM O M S2 in your list it probably shows as Demo ms2 we capitalize filenames in the tutorial text because they stand out more that way it means the same thing Is the list box listless empty If itis you probably don t have the supporting files loaded in the correct folder DEM O M S2 should be among the files supplied with MultiSurf and a copy of it should bein the Marine Tutorials folder If there is nothing there please exit click Cancel choose File gt Exit review installation instructions and correct the installation Assuming DEMO MS2 is there double click it Entity Manager The program opens a window in the main area of the screen and displays a picture of a boat On the left side of the screen are three panes one with a list of entity types that we call the Entity Manager one labeled Selection Set that is blank and the bottom one labeled Property M anager These three panes provide ac
52. which a Relative Curve is based one of the control curves of a lofted surface the surface from which a SubSurface is built Same as parent entity surface A 2 dimensional object i e an object that can be defined by 2 parameters In MultiSurf all surfaces have curves Curves or Snakes as parents t parameter tis the parameter used to reference label curves and snakes It runs from O at the starting end to 1 at the other end of the curve or snake You can think of each point that forms the curve as being labeled with a unique value of t March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 191 Glossary of Terms Working with Components wrap up thwart Nav Arch A seat extending from side to side of a small boat tilt One of the viewing angles used to control the camera orientation rotation of the camera about the line from the camera to the look point transom The distinct surface if any that forms the back end of a boat u and v parameters u and v are the parameters used to reference map surfaces From the 0 0 corner of the surface u runs from Oto Lin one direction along the surface v runs from Oto Lin the other direction You can think of each point that forms the surface as being labeled with a pair of values of u v waterlines Nav Arch A set of sections through a hull cut by a family of horizontal planes typically made by one or more Contours parallel to the Z plane WireFrame entit
53. 1 37 lt OK gt to the Edit dialog 10 Click on the lower curve and change its Name to chine 11 Click i or press lt G gt or choose View gt Grid to turn off Grid 12 File gt Save to protect your work so far sheer chine Fig 4 Rowboat model with the chine added lt Y gt view Creating the side surface a Ruled Surface Now we re set to make our first surface a Ruled Surface that will be the side surface of our rowboat 1 With chine still in the Selection Set click e gt Ruled Surface or Insert gt Surface gt Ruled Surface Name the surface side Noticethat the Control curves field has chine in it A Ruled Surface requires 2 curves The first curve chine was pre selected by us because it was in the Selection Set when we opened the Insert Ruled Surface Dialog This is one way to pick parents for entities The other way isto pick them after the Dialog is open 2 Inthe graphics view Ctrl click sheer any place along its length to place it into the Control curves field Since one of the parents has already been selected we need to add a curveto the Selection Set which is done by holding down the Ctrl key while selecting If we selected sheer without using the Ctrl key we would replace chine with sheer March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 37 Making a Simple Model Making the side surface You can tell when you areon the curve when the cursor be
54. 167 Saving the new cabin component essent 167 Loading the new cabin into the tutorial model sees 168 Kee scott c aetates o entr t A fe ffo 168 aer 170 Saving the rudder component sessi nennen nnne nnne 170 Putting the rudder component on the tutorial model usus 171 Mig In to nat 171 Dl eed de 172 Saving the rub rail component sse nennen nennen nnns 172 Putting the rub rail on the tutorial model esser 173 Editing the rub raii aae a tnnt tane AA Ea A trennen nnne 173 eec RS 175 Saving the rig component sss eene tnter tnnt trennen ennt nnns 175 Rigging the tutorial boat sesssssssssssssseseeeene teen entrent 176 Pall JOD 2i oom enc eve An NL mA leer 177 Painting another Poatie a estne tentent eterne tnter street tnt 178 Working with Components wrap Up eeseesssesees esent nnne nne trennen nennen enne 179 Glossary of Terms 181 Index 194 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide v Contents March 24 2011 AeroHydro Inc Marine Tutorials User s Guide vi Introduction Overview Welcome to the MultiSurf tutorials If you are coming to MultiSurf as a mechanical CAD user you ll be entering a new world because surface modeling and solid modeling have somew hat different approache
55. 6 Z 1 Fig 4 8 4s Orthogonal Dragging 9 Drag P53 forward to about X 29 6 Fig 5 SS bg Fig 4 Fig 5 10 P or zz view move or re size view if necessary to bring all of M C5 blue into view March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 114 Marine Design Examples Tangent Boundary Surface Hulls 11 n gt Projected Curve or Insert2 Curve Projected Curve Name MC6 default Curve MC5 blue Mirror Yz0 from the Available entities pane Advanced Divisions 5x4 Fig 6 Projected Curve Fig 6 12 Look atthe 7 or Y view again you ll see that MC5 is drawn right on top of MC6 13 Click on hull b 14 For Control curves lt Ctrl click gt MC6 This is easy to find in the Entity Manager to add it as the last Control curve 15 Turn on Symmetry Images look at the or lt Z gt view and Zoom to Fit Fig 7 Now you can make adjustments to the stern shape by moving control points P51 P52 etc The smooth join between the port and starboard sides at MC6 is durable because of our use of a Projected Curve and a B spline Lofted Surface Close the model don t save changes Tangent Boundary Surface Hulls Support of Tangent Boundary Surfaces which are based on their edge curves provides an interesting and attractive
56. 8 Fig 8 pt14 B spline Z pt6 PolyCurve PolyCurve and B spline ot7 B spline 7 pt2 PolyCurve Fig 8 pt4 on PolyCurve 12 Return to Select Mode 13 Rotate center mouse button or wheel if you have one and see what you have created Y ou should have a spline in the plane determined by the location of the point selected when you started the Quick Spline You have not created a relationship You just used pt7 to set the depth of the plane in which our spline will lie You have also used pt7 asthe starting point of the spline although this is not required If your curve didn t come out as advertised click Undo and try again Using Quick Spline can take some practiceto get right A Ruled Surface 1 Tomakesureweareall working from the same model Close POLYCURVE1 and open POLYCURVE2 ms2 2 Goto ES Top view 3E 3 orShow Hide Hide Points 4 Put the just created B spline and the PolyCurve into the Selection Set March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 82 Introducing More MultiSurf Entities SubCurves 5 Multiple Edit in the Property Manager 6 Turnontickmarks OK Tickmarks are placed at t 0 1 2 etc along the curve These may be easier to see if you clear the Selection Set to remove the bold representation of the curves PolyCurve B spline Fig 9 Notice that the PolyCurve s tickmarks are evenly spaced along the curve This is also truefor Arcs and Lines The B s
57. AeroHydro Inc Marine Tutorials User s Guide e 154 10 Procedural Surface Tutorial Creating the Cross section The intention is to have this edge snake along the bottom of the surface Depending on the order you chose the parent curves it will either be the v 0 edge or the v 1 edge Select your surface look at the orientation and choose the proper snake from the drop down list Extra credit if your first choice is correct Positive or negative orientation is not important at this time With the Edge Snake in the selection set press q for Quick Point M ode The Snake was in the selection set In Quick Point Mode we will create Rings with every click With the cursor near the Origin click one Ring Movethe cursor over the snake and click another Right click Select or Esc The first Ring was placed at the end of the snake or the corner of the surface the start of our cross section The second ring ensures tangency with the bottom plane Select ST Insert Snake Edge Snake This snake should be perpendicular to the first on the edge opposite from the origin Did you get it on the first try The reason for this snake is to have a support for the point at the opposite corner of the cross section shape Our shape will be a snake on the surface using magnets for supports It is preferable to use a ring in the corner which has more constraint than a magnet with its 2 degrees of freedom Select Surface S1 and Toggle to
58. AeroHydro Inc Marine Tutorials User s Guide e 99 Building Tangency with B splines Tangency and Mirrored Curves 10 Close the part don t save changes Tangency and Mirrored Curves In this example we ll use Projected Points to make a B spline Curve end perpendicular to a plane then we ll mirror that curve across the plane The B spline Curve and its Mirrored Curve will join durably and smoothly across the plane 1 File gt Open TANPLANE1 ms2 from Tutorial Files 2 Select ptt 3 E gt Projected Point or Insert Point Projected Point Name pt5 default Point pt1 pre selected Mirror xplO default OK 4 Now put pt4 into the Selection Set and press lt F4 gt to make another Projected Point OK to accept the defaults Fig 9 P C Fig 9 Add the Projected Points as Control Points We ll add these two Projected Points as the first and last control points of the B spline Curve thus making the B spline ends meet the plane perpendicularly 1 Click curvet 2 Add pt5 and pt6 to the set of Control points 3 In the Selection Set pane select pt5 then use f to move it to the top of the list 4 IntheEdit dialog click OK Fig 10 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 100 Building Tangency with B splines Tangency and Mirrored Points t i Fig 10 Make a Mirrored Curve Now for theMirrored Curve 1 Place curvel in t
59. Entity tab At the top of this dialog you see settings for different Quick Spline options Check the radio button to create C Splines set Degree to 3 and make surethe Alternate spline creation box has a check mark lt OK gt Back in the workspace click or press Y to arrange the view to look down the Y axis Click e or lt S gt or Insert gt Quick Spline Mode to turn on Quick Spline mode Notice that the cursor changes from a R toa SN when the pointer is in the graphics window Make the first mouse dick above the origin somewhere it doesn t matter where we placethese points as we will edit their locations in the next step Click and release and move the mouse to the left Click again for the second point move to the left and double click to make the last point and end the curve Go back to Select Mode by using the Right Click menu or pressing Esc or choosing Select gt Select Mode or clicking the toolbar button again or lt S gt Click in white space to clear the Selection Set Now you dearly see3 points and a curve passing through them Rotate the model oo or usethe wheel and you will see that the curve was created on the plane passing through the origin where all Y coordinates will be equal to zero Or as we say in MultiSurf the Y 20 Plane Editing the curve To edit the curve we edit the points which are the parents of the curve 1 2 Go to Home view e and click on the point furthest to the right Th
60. Export 2D2DXF gt Export 3D Help gt A bout MultiSurf gt H elp Topics Latitude Longitude Radius Tilt Orthographic View Parent Child box Right click menus for graphics area whitespace Entity Manager whitespace and entity Select gt Children gt First Generation gt All Generations and Select gt P arents gt First Generation gt All Generations Entity Manager Selection Set pane A vailable Entities pane Tools gt Options General Rotation Constraint Free tumble Z axis vertical Tools gt Options Model Home View Tools gt Options Performance Degrees per Keystroke Tooltip shows name and type when held over entity View gt Display gt Wireframe gt Shaded gt Shiplines gt Perspective March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 7 Views and Viewing Program startup View gt M arine View Orientation2Bow gt Stern gt Port gt Starboard gt Deck gt Ked gt Home View gt M echanical View Orientation gt Left gt Right gt Top gt H ome View gt M odify gt Pan gt Previous gt Rotate gt Zoom In Out gt Zoom to Area gt Zoom to Fit gt Zoom to Selection e View gt Nametags Point e View gt Symmetry Images e Wheel Rotate Zoom e Window gt New Model Window gt Tile Vertical Program startup If you have not yet installed MultiSurf and its supporting set of model files on your computer please follow the instructions in the main manual under Installing MultiSurf Start MultiSurf from the
61. Fig 5 6 Now drag bead1 back and forth on its line Again the loop remains closed and the curvature remains smooth across bead1 As the bead nears the end of the line the tangency requirement forces one end to become nearly perpendicular to the line and then to form a sharp point in the B spline curve making it anything but smooth If model requirements demand the placement of the bead further out along the line but you still want the rounded shape try lengthening the line first and then moving the bead to the proper location We ve used the tangency property of the ends of a B spline curveto our advantage We know that the end of the splineis tangent to a line between the last two control points If both ends of the spline share the same line both ends will betangent to the line and to each other 7 File Close the part don t save changes Tangency Between a B spline Curve and a Line This time we will construct the model so that only one end of the B spline Curveis tangent to the Line To do this we will changethe control points on each end of the B spline Curve and then pull the bead out beyond the end of the Line onto the extension of the Line 1 LOOP2 ms2fromw Tutorial Files 2 Edit curvet in the Property Manager 3 IntheSelection Set pane highlight pt5 then click X to removeit from the list of control points 4 Sill in the Selection Set pane remove the second instance of bead1 5 Atthet
62. Insert gt Curve gt Relative Curve Name relcvupper Curve curve2 pre selected Point1 pt23 pre selected Point2 pt24 pre selected OK Fig 16 Fig 16 The Upper B spline Lofted Surface Now we re ready to make the first B spline Lofted Surface 1 Select curve relcvupper and curve in that order These will be the control curves for the upper B spline Lofted Surface 2 gt B spline Lofted Surface OK to accept all defaults To visualize the tangency here let s make the ruled surface between the last two control curves 3 Select relcvupper and curve2 4 gt B spline Lofted Surface a B spline Lofted Surface with just two control curves is aruled surface Display gt Color Brown Advanced gt u divisions 8x4 Advanced gt v divisions 1x4 OK 5 Click on point pt17 amp and rotate the model With the two surfaces end on you should be able to see that surfacel ends tangent to the new surface Fig 17 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 105 Building Tangency with B splines Tangency Between Two Arbitrary B spline Lofted Surfaces surface 1 amp surface2 Fig 17 Lat 1 7 Lon 52 Tilt 59 5 6 In Select mode drag pt23 around a bit and watch how the B spline Lofted Surface responds while always maintaining tangency to the ruled surface 7 Undo the changes made in step 6 The Second Relative Curve Now let s
63. Move the mouse over side and watch the status line Click the mouse to drop the magnet when you get to roughly u 0 50 v 0 375 4 Turn off Quick Point Mode 5 Click the magnet to edit in the Property Manager u 0 50 v 0 375 OK Three thwarts We have our starting point From this magnet we will create a curve upon which all threethwarts are based 1 If itisnotstill in the Selection Set select magnet1 2 v gt UV Snake or Insert gt Snake gt UV Snake Name snake1 Type v constant Magnet magnet1 pre selected lt OK gt 3 With snakel in the Selection Set go to Quick Point Mode again Now since thereis a snake in the Selection Set Rings will be created 4 Hold the cursor off the end of the snake at the bow and click the mouse You will seethe Ring snap to the end of the UV Snake Click 4 more rings on the interior of the snake and another off the end at the stern When you placerings or beads with Quick Points the ring or bead will snap approximately perpendicularly from the cursor onto the curve 5 Return to Select Mode 6 Therings were created and named bow to stern ring1to ring6 Select ring1 and ring2 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 46 Making a Simple Model Adding thwarts 1 7 KF gt Line Snake or Insert gt Snake gt Line Snake lt OK gt to accept all defaults 8 Repeat for the other 2 pairs Rings 3 and 4 and Rings 5 and 6 This
64. P13 and pull P13 forward alittle and down a hair to tighten the curve ending up at P12 1 659 0 000 0 011 P13 2 003 0 000 0 727 Fig 48 Fig 48 24 To make sure we re all together at this point close DEMO without saving changes and open the sample file DEMOTYP3 25 Reopen DEMO and comparethe two models Now as far as the screen displays go you probably can t see any significant changein the model shape But if you plotted out lines from DEM O and from DEM OTYP3 we suspect you would prefer DEMOTY P3 perhaps for reasons that you couldn t put your finger on As we ve said that at least is our experience with Degree 2 vs Degree 3 control curves The End As you ve seen MultiSurf provides a wide variety of entities and tools that allow you virtually unlimited flexibility to create and modify designs File Exit do not save changes March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 147 Procedural Surface Tutorial Overview We feel this is an important technique for creating free form shapes A single Procedural Surface is used to bridge between two profile curves Because of the different shape of the two profiles it is necessary that the swept shape be freeto scale to a proportional shape given the differences in span This technique can be used when two or more profiles are given and the surface is expected to match the vertical and horizontal profiles exactly There is provision for in
65. Parents dialog The Resolving Names dialog indicates no name conflicts so OK to Edit gt Attributes ayer 5 File gt Save This should match our distribution model COM PBT4 M S2 Clear Selection Set Fig 7 lt F5 gt to turn symmetry images on and take a look at the results so far then lt F5 gt to turn them off again Fig 7 How about a little detail M aybea rub rail to protect our lovely little TUT boat Let s go grab the one in the SweepSurf sample model GUA RD 1 M S2 Saving the rub rail component 1 Open GUARD1 MS2 from the WultiSurf Tutorials folder This hull isa modified DEM O hull so its u v orientation is the same as that of our Component boat The rub rail is a Sweep Surface its path is the Line Snake cove magenta specified by the bead ring white its shape is the Arc shape cyan at the forward end of the rail its guide is the Offset Curve guide blue Select the guard surface ES to Select gt Parents gt 1st Generation Y ou get 5 objects 2 of which are B spline Graphs not visiblein the drawing We would have missed these if we had selected the objects just by clicking them in the drawing B spline Graphs are March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 172 Working with Components Rub rail not currently availablefor editing in MultiSurf but can beimported and used in this wa
66. Point sse nennen 97 Tangency Between a B spline Curve and aLine sss 98 Tangency and Mirrored Curves sssssssssssseseeeeeene inet nnne nne nntn ennt trennen nnne 100 Add the Projected Points as Control Points essssseseeeeeenees 100 MakeaMirrored Curve s eisini iniiaiee anaa aaia te tnt 101 Tangency and Mirrored Points eesssssseseesseeene tne nn etate tnter tnnt tnt 101 Tangency Between Surfaces nennen tnter tnter etre tnter tnter 102 Tangency Between Two Arbitrary B spline Lofted Surfaces sssssssssss 103 The First Relative Curve sessi trennen tenente trennen nnns 104 The Upper B spline Lofted Surface sssssseeeeenennennnnnnennens 105 The Second Relative Curve sseesssseseeeeene entrate tntn etn tn street 106 The Lower B spline Lofted Surface sse netten nnns 107 Marine Design Examples 109 Up I ETT 109 C spline Lofted Hulls with B spline Master Curves sse 110 Bow ROUMAIN usiane 112 FROIN SMCS aaa E 114 Tangent Boundary Surface Hulls esses ennt 115 Keel with a Durably Straight Portion esses nennen nnne 116 Developable Surfaces esses eene nn n nnetnene trennen stretti tn snnt enne 117 Mixing Develop
67. Polyline Display We ll show you another way you can visualizethis tangency 1 Hide line1 and line2 Try right clicking on each line and selecting Hide 2 Click curve1 to access Editing in the Property Manager 3 Check the Polyline check box OK Fig 2 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 95 Building Tangency with B splines Tangency and B spline Curve Loops Fig 2 With the polyline displayed you can visualize the tangency at the ends of B spline Curves Drag one of the end points and watch the polyline remain tangent to the end of the curve With this image on the screen we d also liketo point out that the B spline Curve makes a smooth imitation of the polyline shape This is one of its key design properties 4 Close this file don t save changes Tangency and B spline Curve Loops We ll use the next model to demonstrate how you can construct a B spline loop that is durably smooth across the joining ends We do this by constructing the ends so they are tangent to the same line 1 File gt Open LOOP1 ms2 fromw Tutorial Files Here again we want to select all the points in the model in order and usethem to make a B spline Curve Since the points are named sequentially here s another way we can select them 2 ER or lt Ctrl A gt to select all the points x 3 gt View gt Nametags Point In the Selection Set pane notice that the points are listed sequentially from
68. Quick Spline Mode lt s gt Start at the inner bottom corner the cursor will change to show you are hovering over a ring at the corner of the surface Click release and move to the Ring on the Edge Snake Click and release continue dropping magnets and drawing out a B Spline Snake Now is your time to be creative Draw the Cross section of a hot tub seat End at the opposite corner by double clicking the mouse 11 Double Click to end the Spline 1 Some notes on using Quick Splines The trickiest part of using Quick Splines is ending them If the double click is hesitant or does not register to the computer as a double click another point could be made at the same location The spline could be ended there with co incident points or it may continue to another place When the spline is ended it is placed in the Selection Set where its properties can be viewed If there are any doubts it s a good idea to review the set of parent points The Cross Section Curve The example below left shows a reasonable cross section curve for a hot tub Of course it is a free hand sketch and may not be suitable if strict dimensions are to be followed It is quite possible sketched geometry from another system needs to be used as a cross section Here is a quick breakdown of the steps Import the cross section from SolidWorks IGES or DXF March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 155 Procedural Surface Tutorial Finishing up
69. Set File Save COMPONENTBOAT MS2 This should match our distribution model COMPBT3 M S2 Fig 6 Close SAILBOAT do not save changes if any Transom This is getting to bea pretty complete model our next step is to close up the transom We ll use an already made component that will fit on this model This component attaches to both the deck and hull so we need to pick both of them 1 2 Click deck then lt Ctrl gt click hull to preselect them File gt Component gt Load gt TRANSOM1 MC2 from the MultiSurf Tutorials folder In the Resolving Parents dialog check the Parents notice that they are reversed we preselected them in backwards order oops again It s important to get them in the right order so we have to correct that We could Cancel and begin again preselecting the Parents in the correct order hull then deck but we can also fix the support right here so let s do that March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 171 Working with Components Rub rail 10 11 Rub rail With thefirst required support hull highlighted double click C spline Lofted Surface hull in the Available Parents list box The object is filled in as the first support Highlight the second required support deck in the upper list box then double click Arc Lofted Surface deck in the Available Parents list box The object is filled in as the second support lt OK gt to the Resolving
70. Show Hide gt Show Parents Surfaces filter Tools gt Options Dragging Dragging Orthogonal Dragging Tools gt Options Dragging Snap increment Tools gt Options Dragging Snap Clear All Tools gt Options Dragging Snap Set All e View gt Display gt Curvature Profile e Zoomto Area4dick centers the model at the click point If at any time what you see doesn t match what we are saying just back up to the most recent place where we began with the original DEMO mode and proceed anew you may have done something as simple as skipping a linein the text or use an March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 51 Interacting with Models Scale model intermediate distribution file The intermediate M S2 files for Tutorial 3livein the MultiSurf TUTORIALS folder MultiSurf Marine Tutorials Introduction contains information about taking a break what to do if your screen doesn t match our instructions basic terminology typeface and symbol conventions and trouble shooting When you Save As or Export files in this tutorial you may get a Replace existing file query If you do it just means someone has already run the tutorial and saved afileunder that name Go ahead and replacethe file 1 Start MultiSurf by choosing Start gt Programs gt A eroH ydro2M ulti Surf or using Windows Explorer the program filename is WINDSURF EXE 2 File gt Open DEMO MS2 from the Marine Tutorials folder directory Fig 1 top 3 Max
71. Then substitute P21p as the first control point on MCB P3Ip as the first point on MCC etc Also sheer would then use P11 P21p P31p P41 P51p P6l1p P71 for its control points Then you could drag P21 P31 etc around to reshape the sheer to your heart s content and the curve would always lie in the plane a0 Now we ll admit that on some boats you just can t do a planar sheer In motor yachts the sheer in plan view is often highly curved forward providing flare and deck space and nearly straight aft For the sheer to lie in plane the profile view would have to either be straight or have this same curvature distribution almost straight aft curving rapidly toward the bow not very appealing at least for a concave sheer Since motor yachts don t heel over much you re much more likely to see a horizontal projection so in some sense the 3D properties of sheer and chines may be less critical than for sailing yachts However your motor yacht might be photographed from the air or viewed from a high vantage point from almost any angle or during a banking turn Notethat this principle works equally well for a reverse convex sheer The plane then slopes up and outboard rather than down and outboard The planar sheer principle applies equally to other visually prominent lines chines guards rubbing strakes boottop etc Close the model don t save chang
72. Tools gt Options Dragging Snap 87 Tools gt Options Dragging Snaps 56 Tools gt Options Dragging Snaps Clear All 57 Tools gt Options Dragging Snaps Set All 61 Tools gt Options Entity Quick Spline Defaults 81 Tools gt Options General Auto Orientation 79 Tools gt Options Model Home view 13 Tools gt Options Performance Model Divisions multiplier 133 tooltip for entity 18 transoms component 171 cylindrical 61 139 planar 120 ruled surface 42 Trim hydrostatics 130 troubleshooting 5 can t select 5 how to fix things when you get an error message 5 March 24 2011 if your screen doesn t match our instructions 2 keyboard doesn t respond 5 model disappears from window 5 tutorials figures 5 if your screen doesn t match our instructions 2 taking a break 2 troubleshooting 5 using the online tutorials 1 typeface and symbol conventions U u parameter 45 UV Snake 46 V v parameter 45 View gt Display gt Curvature Profile 59 86 View gt Display gt Shaded 11 View2Display2Wireframe 10 View gt Entity Orientation 44 78 View gt Grid 35 37 90 View2Marine Orientation View 16 View2M echanical Orientation View 11 View gt M odify gt Previous 18 View gt M odify gt Zoom to Area 17 View gt M odify gt Zoom to Selection 18 View gt N ametags Point 23 View gt N ametags Curve 79 View2N ametags Surface 141 views multiple graphics views of model 23 orthographic 15 perspective 15 specifying symmetry in
73. able and Compound Curved Surfaces seen 119 Durably Planar Transom sssssssssseessseeeeene innen trennen tnnt ennt etne tne tne tret rennen 120 Sailing Yacht KEES iriure ie aa a aaae E AEE EE E ceed FO EEG annette 120 DEKS e a e a E A E E A RE a R a E A EE a E E ere 122 C spline Lotted deck 5 arteria te reit niente 122 Developable deck no camber eese enne nnne nnne nnns 122 A Movable B ulkliead rii cei reri med tet er tr ee ata ea tU Ee er reda s 123 S per SEU COUN GS LEUTE 124 dnce 124 A cabin with a flying bridge sess nnns 126 Spars and Rigging t idet e reso de iram aaa avi nene aa Eee aaa pinnas 127 Offsets and Elydrostatics 5 acai i eile bitte ied a 128 Skin Deduction by Offset Surfaces sse eene tnnt nnne nnne 131 A PlanatSheerlihae suiit rnt cere tien etis cesta Eon ita eC De OD Geena 134 Cylindrical Transom Lotti terre treete e Lote cer ie ere dee Dni e ds 139 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide iv Contents A Planing Powerboat ede rote Eee eed tete e gente Ee cie Lo Dee Bye Een Donat 141 Preference for Degree 3 B spline Curve Control Curves seen 143 Procedural Surface Tutorial 149 OVENVICW iss ae 149 Getting Started The Upper Profile sss 149 The Lower Pr
74. ags for a moment The Frame shows as 3 short grey axes the Frame s x axis is solid the transom centerline runs along it the Frame s y axis has 2 dashes pointing outward in relationship to the hull and its z axis has 3 dashes x 3 again 4 Returnto lt Y gt view At the top of the transom on the centerline there is a cluster of points which includes pO the point that controls the tilt of the frame and thus the rake of the transom 5 Select pO click at the top center of the transom then answer the Which Entity dialog 6 Editits location 7 Change Lat to 90 from 80 lt OK gt Notice that the whole cylindrical transom has tilted yet it remains accurately attached to the hull This is the position in which weoriginally designed the frame and transom Make the reversed transom 1 Eitthe location of pO again 2 Thistime change Lat to 120 Fig 11 This should match our distribution model DEM OTR3C M S2 Thereis our reversed transom still accurately attached to the hull and still cylindrical but E Fig 11 3 and o turn off Point N ametags to see the entire profile Our boat is now rather skinny at the stern and the upper transom edge is too curved but not for long Let s assess the situation 4 Gotothe e or X view and I March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 62 Interacting with Models Reshape the stern T
75. ainn e e ere deian aeai enne inet aa tnter thee tn atrae tns innen 5 ErronM CSSAQ CS inisio a a aoa iaaa aiiai 5 Views and Viewing 7 Ka twore lla ato aA A A E A A corres peercre Tree 7 P ograni startu Psinai a aa e a G A a O Ea EA NE EA 8 Open a mogel file saiisine idekia eieaa aaia E adea iaaa anaiai aaa iaaii 8 Dialog box introduction sss tnnt 9 iSo MUERE 9 Entity MamaQer is csi 9 Shaded vs Wireframe view esssssssessiseeeesn enne tnnt ntn tntn atre tn athens sna tn etre tns tnnt 10 Controlling the VI rece e Pelri acer do es Oneida aa Aia 11 Free tumble mode ith e e atr de oed P OR Ld dedo vi reuse 11 Zaxis vertical iode ssec ton Monito uc a TUI DESC eee 11 Viewing KLAES E OAE 11 Dynamic viewing esssssesssssssseeenne nennen trennt nennen enin tns tne trennen trennen nenne tnnt 13 Which Rotation constraint to use ssssssssssssssseeeseenneneenenn enne nne 14 Orthographic vs perspective views sssssssssssssseeseeeene teen ennemi 15 Help side trip esssseesisseseesesseen entente tna tna tren instr atre tetn s itn tn etre te tns tn atra te tne sn etre 16 OUP WAYS LO ZOOM diticasicectics 17 OY 17 ZOOM O ATEA e ses 17 Zoon tO SA OCU OM ss e M 18 ZOOM WO CUNSOM EEUU 18
76. ake a model from scratch This tutorial is longer than the first one It is easier to follow if you have enough flexibility to run the entire sequence without having to dosethe model MultiSurf Marine Tutorials Introduction contains information about taking a break what to do if your screen doesn t match our instructions basic terminology typeface and symbol conventions and trouble shooting The filenames of the intermediate M S2 files for Tutorial 2 all begin with T2ROW and they live in theX Marine Tutorials folder In the beginning of this tutorial we use quite explicit instructions often down to the last MultiSurf mouse click When we assume you are familiar with a particular menu choice or dialog we give you more general instructions eg the simple instruction Select p11 would replace the sequence In the wireframe drawing point the cursor towards point p11 Click the mouse button In the Which Entity dialog click on Point p11 to highlight it Click lt OK gt Entity introductions Bead Edge Snake Line Snake Projected Curve Ruled Surface UV Snake XYZ Ring March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 29 Making a Simple Model Overview Concept and Function introductions by ooa cursor shapes A t4Enter Ctrl F2 Ctrl HH gt Ctrl HL gt Ctrl HN 2 Ctrl 4W Esc F4 G gt gt Q gt S lt Shift A shortcut keys Y 0 default plane
77. al view 13 Click on the magenta Contours waterlines to select it 14 File gt Export 3D gt 3DA wireframe 15 In the options select Selection Set Only lt OK gt 16 For filename enter temp OK gt to replace an existing file if any 17 Minimize MultiSurf window 18 Start Notepad from Windows Program M anager it s in the A ccessories program group Notepad is a Windows text editor 19 File gt Open 20 In thelist box of file types select All Documents or All Files 21 In the MultiSurf TUTORIALS directory choose TEMP 3DA lt OK gt The contents of a 3DA file is a table of numbers The 0 and 13 s in the first column are pen colors the zero meaning move here with pen up The remaining 3 columns are X Y and Z coordinate values for the points along the waterline The first point has X 1 61920 the number we just found by zooming in on the forward end of the waterline 22 PgDn or scroll to see the end of the file The last point on the curve has X 29 33683 This is the aft end of the waterline the point we re looking for this is the value for X10 below 29 337 will do 23 Close Notepad Now we havethe information we want let s use it 24 Maximize MultiSurf March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 66 Interacting with Models Add a cove stripe dick its icon at the bottom of the screen 25 Click on one of the red stations to edit in the Property Manager 26 F
78. an Press lt Ctrl gt then place the pointer anywhere in the graphics view and hold down the center wheel or button of your mouse if you have one and move the mouse Select View gt Modify gt Pan or Right click in white space and choose Pan or just click and then press and hold down the left mouse button in the graphics space while moving the mouse The cursor changes to de to indicate Pan mode Zoom If you have a center mouse wheel the easiest way to rotate is simply to move the top of the wheel away from you to zoom out or to move the top of the wheel towards you to zoomin If you usethe wheel the cursor shape does not change Alternatively you can select View gt Modify gt Zoom In Out or right click in white space and choose Zoom In Out or just click Qr and then press and hold down the left mouse button in the graphics space while moving the mouse The cursor changes to Q to indicate Zoom In Out mode Move up to increase magnification down to reduce Zoom to Area If you have a center mouse wheel or button press Shift then place the pointer anywhere in the graphics view and hold down the center wheel or button of your mouse Drag a box around what you want to zoom in on or click and release to center the model on the click point Alternatively you can select View gt Modify gt Zoom to Area or right click in white space and choose Zoom to Area or just click e and then press and hold down the left mouse button i
79. and Y 20 plane of symmetry Ambiguous Selection Bead can drag off end of curve but not sideways Ctrl 4dick adds entity to Selection Set Edit Entity in the Property M anager Edit gt Transform gt Scale File gt N ew gt Save gt Save As Filter Curve Point Invert Filters Insert gt Copy Last Insert gt Quick Point Mode Insert gt Quick Spline Mode Left mouse click gt drag selection Lowest dimensionality entity selected Mirror Symmetry Points drag in plane of screen Points explained 2 parents Pre selected entity Preserve A bsolute Location Preserve Offset Values Quick Bead Ring snaps perpendiculaly to curve Quick Magnet Quick Ring Quick Ring placed off end of curve snaps to end of curve Replace space with automatically when naming entity Right click in white space gt Select Mode Right click on entity in Selection Set pane gt Show Right click on entity gt Hide Select gt Class Filters Set All Select gt Select M ode gt Hidden gt Both gt Reset All Filters 2Clear Selection Set Show Hide gt H ide Selection Set gt Show All gt Show Selection Set Snakes Surface u and v parameters explained t parameter explained Tickmarks Tools gt A dopt Children Tools gt Options Entity Quick Spline Defaults Tools gt Options General Auto Orientation Tools gt Options M odel Latitude Model Comment Tools gt Options Model Units Two Ruled Surfaces joining at their common edge have no gaps View gt Entity Orientation
80. ane sections in each These are from top to bottom body plan separate views of the bow and stern looking along X and X profile view or devation looking along Y axis plan view looking along 4Z axis E Fig 10 If we wanted more stations waterlines buttocks etc we could get them by adding more Contours entities to the model You can t work on the model in this view but you can export a 2D file of it Right dick in this view and select Export DXF Give it the filename demo2 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 20 Views and Viewing Symmetry images Close the ship lines view by clicking atthe top right of the ship lines window The graphics window becomes the active window again Symmetry images The graphics image on your screen represents one side of a hull which has mirror symmetry with respect to the centerplane Y 0 The model file includes the information that this model has mirror symmetry but the display of the other side has been suppressed by default We can change that View gt Symmetry Images or lt F5 gt is a toggle which switches the program back and forth between displaying and suppressing the symmetry images specified for the model With symmetry images on you can see how thetransparency of the wireframe can make a confusing image Usually wireframes look better with symmetry image
81. ange the Name to bottom ctr Did you noticethat MultiSurf automatically placed a when you typed a space MultiSurf does not allow spaces in names but you can type them and we ll do the rest In the Display tab make the color bright blue Click OK Fig 6 projected curve t y basis curve Fig 6 Rowboat mode with the bottom centerline curve a Projected Curve added H ome view Now we havethe two curves needed to create the bottom surface On with the project 6 Pick or Ys view 7 Click on the bottom curve Since bottom ctr is directly behind chine in this view MultiSurf cannot tell which entity you want We call this situation an ambiguous selection When this happens MultiSurf informs you by changing the cursor to by ooo Theresult of clicking when you see this cursor is a Which Entity box that lists all of the entities that can be selected at this location To select the one you want click on it and then click on lt Select gt In this case select bottom ctr 8 Ctrl click the bottom line again and the Which Entity box appears again MultiSurf again does not know which entity you want Thistime select chine and click lt Select gt The Selection Set pane should now show the two curves bottom ctr and chine 9 e gt Ruled Surface Name bottom Control curves pre selected Color brown Click lt OK gt to create a flat brown bottom to the boat This should ma
82. ansformable objects in the model radio button Transform factor for X 0 917 that s 11 12 Transform factor for Y 1 Transform factor for Z 0 917 OK Don t worry about the Non Transformable Entities warning box Since only Points are scaleable in MultiSurf if you try to Scale an entity other than a Point this box warns you that that entity will not scale directly If you put an entity s parent points in the Selection Set it will scale properly See Transform in the Reference Guide to Functions section of the manual for more details Suppose beam is 2 wider than desired whiletransom is 2 too narrow 2 Switch to P or Z gt view 3 Setfilters for Points only 4 Click s2 midships on sheer 5 Reducedy by Linch to 1 917 feet 1 is 1 12 or 0 083feet lt OK gt 6 Click s3 at stern on sheer 7 Increase dy by 1 to 1 583 lt OK gt March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 48 Making a Simple Model Tutorial wrap up Do you see what Relational Geometry has donefor us We built up a model consisting of 32 entities At the very end we went back to the second and third objects on which all subsequent objects depend and said I wish had done these a little differently So we makethe changes and presto we have our complete new design that maintains all the properties we specified the boat is precisely symmetric about the centerplane slanted sides the angles haven t changed
83. ar area you just imagined 5 Press and hold down the left mouse button down while you drag the pointer to the diagonally opposite corner of the rectangle A rubber band line will stretch to enclose the rectangular area you are defining 6 Release the mouse button The area you picked is now enlarged to fill the screen Fig 8 7 Press F8 or View gt Modify gt Previous shortcut key it returns you to the last view that completely drew on the screen rsd e 8 Choose lt F8 gt again to return to the bow doseup view Fig 8 9 Try zooming in on the nose again There s still some drift Let s try one more method 10 Return to Select Mode and Zoom to Fit Zoom to Selection Atthe very tip of the bow is a point that is yellow 1 Movethecursor over this point When you are over the point the cursor changes to EN and the tooltip reads Point p11 Click the left mouse button This places the point in the Selection Set 2 Now press amp or lt 10 gt or View gt Modify gt Zoom to Selection This centers the point on the screen and makes it the new look point That means that zooming now keeps the tip of the bow on the screen and also keeps the tip at the center of rotation 3 Try zooming and rotating to see how the view changes Zoom to Cursor 1 Placethecursor near the area of the model you desire to zoom and roll the center mouse wheel towards you The view will zoom to the c
84. arent list box at thetop and a children list box on the bottom Entities appearing in the parent list arefirst generation parents for the selected entity things it depends on directly This shows that MCI depends on P11 P12 P13 P14 The children list shows things that are first generation children of the selected entity in this case only C spline Lofted Surface hull Another way to see the parents or children of an entity is to place its parents or children into the Selection Set the second pane in the set of three panes running down the left side of the workspace 5 Click OK to close the Parent Child Relationships box 6 With MCI still in the Selection Set click k or Select gt Parents gt First Generation Its first generation parents appear in the Selection Set window 7 Click k again and you see the next Generation of parents of MCT if there are any No more entities appear showing that there are no more parents for this entity 8 Clickin white space to dear the selection set and then select M CT again 9 Click R or Select gt Children gt First Generation to see the first generation of MCl s children 10 Click Eh again to see the next generation March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 22 Views and Viewing Multiple graphics views of a model If you want to see all of an entity s parents or children at once you can just choose Select gt Parents gt All Generati
85. be ON To check this dick on Toolbars A toolbar is on when checked On the Tools gt Options General tab Rotation Constraint should be set to Free tumble On the Tools gt Options Dragging tab All the snaps should be ON Prompt after drag should be OFF no checkmark There are six types of arc each supported by three points Arcs are true circular arcs They are useful whenever you need a partial or complete circle as part of your design As you go through this section you might find it helpful to turn on Point x nametags or View Nametags Point Arc through 3 points ARC1 ms2 is a Type Arc through 3 points which passes through its three points in sequence Fig 1 top Z at t 0 s Arc through 3 points Y bottom att 1 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 76 Introducing More MultiSurf Entities Arcs Fig 1 Arcl msz2 1 Dragthe points around to see how thecurve responds 2 File Close ARC1 ms2 don t save changes Arc start center plane guide 1 File Open ARC2 ms2 Fig 2 Thisis aType Arc start center end guide which starts at thefirst Control point start has its center at the second Control point center and ends on the line from the center to the third Control point end guide Arc start center end guide end guide ter center Fig 2 Arc2 ms2 x 2 Click or View gt Nametags Point 3 Try moving
86. ble click on the file Marine Tutorials chm Size and arrange the tutorial windows to suit your needs To follow the tutorial sequence March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 1 Introduction Taking a Break 1 OntheContentstab double dick a tutorial book to open it it is intended that you should follow the tutorials in numerical sequence 2 Double dick thefirst topic in the tutorial 3 Follow this topicto its end There will bea vertical scroll bar at the right of the window if the topic is longer than the window useit to ge to the end of the topic 4 Clickthe LE button to move on to the next topic in thetutorial sequence 5 Repeat steps 3 and 4to the end of each tutorial lc Ss 6 Tomoveon to another tutorial just click EJ again or go back x to the contents and choosethe next tutorial from there Taking a Break Some of the tutorials are quite long and you may not want to tacklethem at a single sitting If you need to take a break 1 Saveyour work When you first save the file use File gt Save As and be sure to specify a new name Saving thefile directly will overwrite the tutorial If you have already given your work file a name different from the distributed filename just File gt Save 2 To resume open your saved file then check in the tutorial to see how the filters nametags and orthogonal dragging mode should be se for continuing File and folder locations The defa
87. by object In this tutorial we ll guide you through saving and loading a number of components to create a fairly detailed sailboat model about 175 objects Only a couple of these will be made using the Insert menu There is only one significant issue in saving a component file Choosing the right set of objects to make up the component We ll demonstrate several techniques for planning and managing this selection There are three main issues that need to be addressed in loading a component 1 Parents resolution We haveto supply suitable parent objects in our model to satisfy the dependency requirements of the component 2 Names resolution We have to adjust the names of the component objects so that they don t conflict with names of any objects already in the model 4 Orientation of Parents When a component attaches to curves or surfaces in our model the t or u v orientation of the new support often needs to be the same as that of the component s original Parents Each of these issues will be addressed in one or more situations as we go through the exercises of this tutorial March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 159 Working with Components The beginning model If at any time what you see doesn t match what we are saying just back up to the most recent place where we had you open a specific M S2 file and proceed anew you may have done something as simple as skipping a linein the text or usean intermed
88. ce and View gt Display gt Surface Curvature Gaussian x Fig 11 Now the surface is all green indicating zero Gaussian curvature everywhere as required 5 Close the model don t save changes March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 118 Marine Design Examples Mixing Developable and Compound Curved Surfaces 6 Open DEVSURF1 from the Examples folder This is a single il chine boat hull made from two Developable Surfaces sharing the common edge chine Fig 12 7 File Export 3D gt RUL surfaces rig 12 8 lt OK gt to the 3D Export Options dialog 9 lt Save gt to accept the default filename Devsurf1 RUL lt Yes gt to replace This creates a RUL file containing two panels The file can be loaded into the MultiSurf utility MSDEV for plane development expansion and other operations related to developable surface manufacturing Close the model don t save changes Mixing Developable and Compound Curved Surfaces Round chine or radius chine construction combines the putative aesthetic and hydrodynamic advantages of a round bilge with the fabrication advantages of large developable areas 1 Open RCSHO This is an example of a radius chine or round chine sailing yacht hull Fig 13 The bulk of the hull area is in the two developable surfaces topside and bottom with all compound curvature limited to the relatively narrow C spline Lo
89. cess to and information about the model and its entities March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 9 Views and Viewing Shaded vs Wireframe view The Entity Manager provides a complete list of the entities in the model listed by entity class When expanded each entity also shows its parents if the Children tab is selected each entity displays its children The Selection Set pane displays all entities that are in the Selection Set Once listed the set can be reordered as a group or individual entities can be removed or reordered The Property Manager is where you would edit the attributes of individual entities or groups of entities For more detailed information on these three panes see The Entity Manager and The Selection Set and Property M anager in the Fundamentals chapter of the User s Guide Shaded vs Wireframe view The opening view of DEMO ms2 is in shaded view Fig 1top Old models open in the view in which they were saved the default view for new models is shaded Fig 1 demo ms2 Click cs or choose View gt Display gt Wireframe to change to wireframe view Fig 1 bottom This is the other way to view the model Wireframe models are transparent Although you can set the amount of transparency in shaded view to appear nearly transparent wireframe view does away with shading altogether In agraphics display points are reoresented by small squares curves are represented by polyl
90. cessary and sufficient condition for a surface to be developable March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 117 Marine Design Examples Developable Surfaces 6 Close the Gaussian curvature window Next we re going to edit the model 7 Click the point sh2 near the middle of the upper edge 8 Change dy to 7 Now sheer and chine are no longer congruent Fig 10 X Fig 10 9 Select the surface and View gt Display gt Surface Curvature Gaussian again Now the surfaceis a rainbow of pretty colors with Gaussian curvature ranging from 6 13e 15 or essentially O red in the central portion to 0 005644 blue in the lower corners This surface could not be made from a flat plate without stretching some material 10 Close the Gaussian curvature window 11 Close Ruled1 Developable surface 1 Open DEVSURFO from Marine Tutorials This model is the same as Ruled1 except that the surface is a Developable Surface This type of surface is still a ruled surface formed by straight lines rulings connecting the two edge curves however the rulings are rearranged to satisfy the condition of developability When you open the model it doesn t look any different than Ruled1 because the lines are congruent and no rearranging needs to be performed but move sh2 again and you will see the power of the Developable Surface 2 Click the point sh2 3 Change dy to 7 Fig 11 4 Select the surfa
91. chanical View Orientation and Bow Stern Port Starboard Deck Keel Marine View Orientation When the grid is turned on these views have both horizontal and vertical gridlines bead A point constrained to lieon a curve body plan Nav Arch Oneof the conventional naval architectural views of a ship hull thetwo end half views orthographic shown side by side displaying thetransverse sections of the ship boot stripe Nav Arch A decorative and or protective stripe near the resting waterplane of a boat usually finished in a contrasting color to the hull surfaces above and below it bow Nav Arch The front end of a boat B spline A continuous curve defined by a series of control points The curveis formed in relation to the 3D polyline i e the broken line joining the control points in sequence A B spline always starts at the first control point and ends at the last control point and it is always tangent to the polyline at these end points but in general it does March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 181 Glossary of Terms Working with Components wrap up NOT passthrough the other control points as opposed to a C spline which passes through all its control points buttocks buttock lines Nav Arch A set of sections of a ship hull cut by vertical planes that are parallel to the centerplane typically made with Contours parallel to the Y plane camber A measure of how much a curve
92. choose keys to press entities to select values or names to typein etc in bold typeface Instructional steps are numbered There is occasional use of bold type for emphasis but this will be clear from its context 2 lt Q gt or press Q gt means press the letter Q on the keyboard Shift Q means hold down the Shift key and press the letter Q Apply means click on the A pply button 3 When we want you to choose a series of menu and dialog box options we print the choices separated by a 2 For example 1 K gt Projected Snake or Insert gt Snake gt Projected Snake amp means dick on the 4 button and pick Projected Snake from the menu or click on Insert and choose Snake from the menu and then Projected Snake from the next menu 4 Weenclose entity names in single quotes eg magnet or pt4 When you typein the entity name don t includethe quotes March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 4 Introduction The Figures The Figures In order to be visually more clear most figures illustrating MultiSurf steps in the tutorials do not show the graphic display shading of surfaces Troubleshooting Keyboard Doesn t Respond If your keyboard seems hung up you may haverun into that unfortunate Windows problem of having pressed Alt unknowingly thus jumping the cursor up to the menu bar where it doesn t show up very well Solution press Alt again to get back out of the menu bar
93. comes WM If you hold it still briefly a tooltip appears saying C spline Curve sheer If you placethe cursor over one of the end or midpoints the cursor will become x showing that you are over a point Side trip MultiSurf hasto try to figure out what you mean when you dick in the workspace It helps do this by giving you feedback about what the mouse is pointing at It also selects the entity with the lowest dimensionality if you are pointing at more than one If for example a point and a line are coincident it assumes that you want the point If you wanttheline movethe cursor just a little and you will get a shot at theline If you havetwo entities of the same dimensionality 2 points say or 2 lines you get what is called an Ambiguous Selection Thisis explained in step 7 under Making a watertight horizontal bottom 3 Besurethat u Divisions are se to 32x1 and v Divisions are set to 1x1 Well discuss surface u and v parameters below 4 Click OK to accept the new object Fig 5 AUT ae Lidii pou Fig 5 Rowboat modd with the side surface added Y gt view 5 E File gt Save just for good measure This should match our distribution mode T2ROW2 M S2 6 Rotate the model around to see what you have 7 Press F5 View gt Symmetry Images to see the symmetry image as well 8 e to get the original view 9 Rotate to see the bottomlessness Yes it s sternless too 10 Then turn the Sy
94. constrained to be vertical i e tilt 20 the model never appears to tumble N ote that this does not mean that positive Z always points up but that the axis is always vertical in the plane of the screen Note There are 2 caveats about the Z axis being vertical 1 When you arein perspective view the Z axis will sometimes be a little angled This an artifact of how the perspective view is generated 2 Threeviewsin Mechanical View Orientation Left View Right View and Top View all have non zero tilt and Home View which is found in both M echanical and Marine View Orientation can havetilt set to non zero If you go to a view that has non zero tilt and then rotate the model will immediately jump so that theZ axis becomes vertical in the plane of the screen You havetwo options for dealing with this use Free Tumble mode for which this is not a problem or use the Marine View Orientation buttons all of which have tilt 0 Viewing in steps You can think of the view of the model as being recorded by a camera which is where your eyeis Picturethis camera residing on the surface of a sphere pointing inward toward the center of the sphere which is the look point Fig 2 After you zoom pan or rotate the camera ends up in a different position around the model The camera position is specified by four variables latitude camera angle above or below the horizontal X Y plane longitude camera angle to the left or right fro
95. d Curve nametags on sheer outer profile inner Fig 37 The model includes 4 longitudinal C spline Curves yellow sheer outer inner and profile The three component surfaces join accurately along thar common edges because outer is identical to the last lofting spline u 1 on topside and inner is identical to the first lofting spline u 0 on bottom Here are some considerations in the construction of this model First to get the general character of the longitudinal curves which typical of planing powerboats are highly curved forward and only slightly curved or even straight aft with cubic splines requires a minimum of 5 control curves the splines need to have a knot about midships and it takes 5 points for a C spline Curveto have one knot 4 lt gt view 5 View gt Display gt Curvature Profile of sheer then outer e Y view and look at the curvature profile for outer in this view 7 View Curvature Profile of sheer then profile Fig 38 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 141 Marine Design Examples A Planing Powerboat Close C spline Curve profile Fig 38 In each case the profile is V shaped showing an abrupt change of slope at the single knot amidships None of the curves have inflection points profile is accurately straight from the third master curve aft Th
96. d is to be placed Right now the bead is measured in units of t but our boat is measured in feet or inches Hereisa quick way to remedy the situation 9 Select the line I0 10 n gt XYZ Bead or Insert gt Bead gt XYZ Bead Name e2 Constrain to X X 10 lt OK gt 11 Add bead e0 to the Selection Set 12 lt Shift A gt Adopt Children Reverse Order Delete old parent e0 OK The bulkhead can now be placed by typing an X valuein to the Edit Dialog for the XYZ Bead e2 13 Close the model don t save changes Superstructures Superstructures that durably join the deck can be created with surfaces built off snakes on the deck surface A movable cabin 1 Open 2CABINS yes this is the same file we looked at in Tutorial 1 2 lt 5 gt Symmetry Images The deck surface here is a C spline Lofted Surface similar to the one in Hulldeck 3 Zoom in on the cabin x 4 Point nametags r0 and rT white are rings on an Edge Snake n0 magenta that runs along the centerline edge of the deck surface r1 is a Ring relativeto rO dmt dm2 dm3 red are three magnets on deck dm1 and dm are Magnets relative to r0 dm3 is a M agnet relativeto rl March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 124 Marine Design Examples Superstructures Notice also rp1 rp2 rp3 rp4 blue each of these Points has o
97. de 5 Click to drop points Noticethe points are Magnets and the spline is a Snake If you click the cursor off the edge of the surface the resultant magnet will snap to the dosest point on the edge 6 Double click to end the Quick Spline 7 Close BSNAK1 3 MS2 don t save changes March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 88 Introducing More MultiSurf Entities C spline Lofted Surfaces C spline Lofted Surfaces 1 Open CLFT5X4 MS2 This is a C spline Lofted Surface using 5 B spline Curve master curves Just as a C spline Curve passes through all its control points so a C spline Lofted Surface passes through all its master curves Fig 18 i View Nametags Curve to identify the master curves x 3 or Show Hide gt Show Points to seethe points that support the B spline Curve master curves Fig 18 4 Show Hide gt Hide Points to get them out of the way again 5 Select the five master curves this is probably most easily done by dragging a box around then and then removing the surface from the resulting Selection Set 6 Inthe Property Manager change visibility to add tickmarks The green lines are the u constant lines on the surface hull Each is formed by first taking a point from each of the master curves where its parameter t is equal to u Then a C spline is formed using these 5 points as control points Sincethe surface hull has 10 u divisions and we ve turned on thetickmar
98. de internal and made current Usethe right dick button to access the context sensitive menu for these choices Parents Children E F Components 4 Hull Ak Deck 13 File gt Save AsSCOMPONENTBOAT MS2 in the MultiSurf Tutorials folder This should match our distribution model COM PBT1 M S2 Cabin Cabin from 2CABINS MS2 Now for a cabin There s a niceone in 2CABINS Let s just make a component of it and slap it right on our deck Saving the cabin component 1 Open2CABINS MS2 in the MultiSurf Tutorials leave COMPONENTBOAT open as well In order to save a component we select the objects that will bein it We could select them one by one until we hopefully had them all but that would be tedious Y es thereis a better way From Tutorial 1 you know that you can movethe entire cabin by dragging just one point So let s select that point then add all the generations of objects that depend on it that is all the direct or first generation dependents of r0 plus all their direct dependents plus all their direct dependents etc MultiSurf has a menu option that makes this easy to do x 2 toturn on Point Nametags 3 Select r0 white along the centerline where the front end of the cabin crosses it 4 Select gt Children gt All Generations MultiSurf adds 19 objects to the Selection Set Now let s check in the other direction Parents 5 Scroll down to the bottom of the Selection Set Manager a
99. den i entities that are no longer in the Selection Fig Set 12 In the Entity M anager click next to Q Surfaces to expand that category Click on hull or the icon next to it This places hull into the Selection Set Exand the Contours category and lt Ctrl click gt stations With hull and stations now in the Selection Set we can show them again with Refinements March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 63 Interacting with Models Reshape the stern With Orthogonal Dragging still on drag m3 up to about du 0 oru 21 watch the dynamic values on the status line dv and v stays at 0 92 although you may not be able to see this if the report runs off the status line du may also run off thelineif your screen resolution is low enough The curve of the transom top and the height at the transom side junction look fine but compare the curve of the transom edge magenta with the curve of the aft stations red the stations bow too much It looks as though m4 and m6 need to go inboard 2 Click m6 3 Try changing dv to 0 5 do not disturb du 20 lt OK gt 4 Drag m4 to about du 0 53 Watch the status line value Note When Ortho dragging is on dragging movement is constrained to one direction up down or right left in the plane of the screen In our current situation the transom basis surface on which magnet m4 is con
100. deviates from its chord Often used in different disciplines with specific meaning e g Maximum Camber The greatest deviation of the curve from its chord Camber Ratio The Maximum Camber divided by the chord length Deck Camber Naval architecture term for Camber Ratio as measured for deck stations It is frequently assumed that the shape of deck stations are arcs Foil Camber The deviation of the M edian curve from the chord where the M edian curveis the curve describing the points of mid thickness of the foil Camber Function The camber as a function of chord length usually for describing foils camera You can think of the screen view of a model as being recorded by a camera which is where your eyeis in the 3D model space child entity Any entity that is defined in terms of another parent or support entity If you change any entity the program automatically updates all of its children Same as dependent entity chine A hard edge between two surfaces a join between two surfaces involving a sharp bend hard corner or break in slope Nav Arch The join between two longitudinal hull surface strips especially topside and bottom surfaces in a hard chine boat hull also the structural member if any that runs along this join chord line The straight line connecting the end points of a curve contours Contours are one or more parallel sections in a user specified orientation Each section cuts all the
101. dialog be sure Arc Lofted Surface deck is selected as the parent lt OK gt 5 This time the Resolving N ames dialog reports 3 name conflicts In the prefix field type Cabin then click lt OK gt MultiSurf will add the prefix Cabin to the names of all the component objects being loaded Cabin will also bethe name of the component in the Entity Manager Eu o Remp SS n M SSS SSS Fig 4 Oops that doesn t look like the cabin in 2CABINS M S2 Fig 4 What s going on Quite simply we ve just done a demonstration that any ol cabin doesn t always do what you want Why not Because not only do component support objects here the deck haveto be appropriate kinds of objects in this case a surface but they must also havethe appropriate orientation Let s look at this more dosely 6 Activate the 2CABINS window 7 Select the deck The orientation marks show v running from bow to stern and a circle at the bow indicating that the u axis is at the bow The Edge Snake nO March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 166 Working with Components Cabin 10 to which the cabin attaches runs along the u 1 edge of the surface the centerline Now go back to COMPONENTBOAT MS2 Select the deck The orientation marks show u running from bow to stern and v at the bow When we plunk our cabin attached to Edge Snake compone
102. e SubCurves have another important function They can be used to change the parameterization of a curve For an example of this functionality 1 Open POLYCURVE1 ms2 from the Marine Tutorials folder The rest of the model files in this tutorial are also found in theX Marine Tutorials folder Z xarc2 pt6 Y xarc1 pt27 pig 7 In this model we have 2 arcs we will convert into a single curve using a PolyCurve A PolyCurveis a single curve made by joining two or more parent curves end to end Following is a way to select multiple entities by dragging a box around them 2 Placethe cursor in white space near pt4 Click and hold the left mouse button while dragging a box around pt4 When you releasethe mouse button you will have placed pt4 into the Selection Set along with the two arcs because all three entities ended up within the box 3 Click on pt4 in the Selection Set pane and then click X to removeit from the Selection Set 4 n gt PolyCurve or Insert gt Curve gt PolyCurve Click OK to accept defaults 5 Hide xarc1 and xarc2 6 Select point pt2 7 s gt Point or Insert Point Point Name pt7 default dz 5 Point pt2 pre selected OK Notice that the Point entity has two parents Point and Frame The location of each Point its Offsets is in relation to each of these parents If no parents are chosen the defaults arethe origin of the global coordinate system See Point
103. e B spline curve go to im view and v or Q to turn on Quick Point Mode 2 Hold the cursor off one end of the spline click and release 3 Create 6 more beads along the length of the curve the last one should beat the opposite end of the B spline Notice all the beads are being added to the Selection Set 4 Return to Select Mode and with the beads still in the Selection Set 5 n gt SubCurve or Insert gt Curve gt SubCurve OK to accept all defaults Now we swap the SubCurve for the B spline Curve as a parent of the Ruled Surface 6 With theSubCurve still in the Selection Set Ctrl select the B Spline Curve 7 Tools gt Adopt Children or lt Shift A gt If we look at the dialog closely we see the selections are in the wrong order Click the Reverse Order button Ok This replaces the SubCurve as the parent for the B spline Curves children This should match our distribution model POLYCURVEEN D ms2 8 Go back to a Top view 9 The surface has already changed To improve from this point move the interior control beads to change the surface rulings to a more vertical orientation Fig 11 You can use any number of interior control beads to get the desired results With Quick points it is easy to create these points so you can err on the side of too many and you will be sure you will have control you are looking for March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 84 Introducing More MultiSurf Entities C spline Curv
104. e First Relative Curve x 1 View gt Nametags Point 2 Select pt17 at the left end of the middle curve then 4 gt Point or Insert Point Point Name pt23 Offsets dx dy dz 0 default Point pt17 pre selected Frame default OK 3 This puts the new Point at dx O dy 0 dz O which is right on top of its parent pt17 4 Drag the new point pt23 about 1 4 the distance toward pt0 at the end of the uppermost spline see Fig 15 below 5 Select pt22 atthe other end of the middle curve and make another Point Name this point pt24 OK 6 Drag thenew point pt24 toward pt5 about the same distance and in the same direction that you dragged pt23 Fig 15 DB Fig 15 Remember that a Relative Curve should have the same entity orientation as its parent curve that is its starting point should bethe point offset from the parent curve s starting point and its ending point should bethe point offset from the parent curve s ending point 7 Select curve the middle curve Now we know the orientation of the parent curve March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 104 Building Tangency with B splines Tangency Between Two Arbitrary B spline Lofted Surfaces 8 With curve still selected add pt23 and pt24 to the Selection Set in that order you should now havethree entities selected 9 M gt Relative Curve or
105. e and Symbol Conventions point move the mouse arrow cursor on the screen until it points at a particular entity option or button dick or click on point the cursor arrow at a particular entity or item then press down and releasethe left mouse button double click with the cursor arrow pointed at a particular entity or item dick the left mouse button twice in rapid succession dick and hold dick the left mouse button and hold it down drag point the cursor arrow at a point or screen location press the left mouse button and hold it down while you movethe mouse then release the mouse button choose make a selection from the main menu bar wheel zoom rotate use your mouse center wheel to zoom rotate pan or zoom pan or zoom to area to area Selecting Choosing Picking Going to We basically follow the Windows convention of using select to mean marking an entity or item on the screen usually with a highlight or a wider line and choose to mean telling the program to actually take an action as in opening a window or carrying out a menu or dialog box task We also use pick and go to with the same meaning as choose Generally a single dick or pressing Tab in a dialog box will select an entity or item a double click or pressing Enter or clicking OK when an item is already selected will choose the action carry it out Typeface and Symbol Conventions 1 Inthetutorials we print what you are to do menu options to
106. e big list box the Parents arefilled in because we preselected the master curves Load Component Resolving Parents i E File C Program Files Surfacew orks T utorialsClfthull mc2 Component consists of 3 entities Required parents 3 Selected parents 3 Existing Parent Type Existing Parent Name Selected Parent Curve MC1 B spline Curve MCA Curve MC2 B spline Curve MCB Curve MC3 B spline Curve MCC Available parents B spline Curve MCA B spline Curve MCB B spline Curve MCC Point P11 Point P12 Cancel If any of these is not correct highlight the incorrect parent click it then choose the correct parent from the A vailable Parents list box double dick or highlight then click the Select button 5 lt OK gt to the Resolving Parents dialog March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 162 Working with Components Deck 6 IntheResolving Names dialog no name conflicts are indicated but a component name is required dick lt OK gt Load Component Resolving Names x File Clfthull mc2 Component entity name options C Use component name as prefix Do not add prefng Component name put results in name conflicts Max prefix Cancel 22 chars Fig 2 Now we have a hull with stations and a waterline Fig 2 The component we added was actually 3 objects taken straight out of the DEM O model by saving them as a component CloftSur
107. e dz to 42 The model updates and all elements are proportionally located With a slightly less idealized model for example we would represent the thickness of the mast a model likethis could be used to calculate accurate rigging lengths For example 4 Add P11 to the Selection Set Selection Set now truck and P11 5 Tools gt Measure gt Distance and click in graphics white space We get 44 125 for thetall rig With appropriate deductions for end fittings tangs toggles and turnbucklethis would provide an accurate wire length for the forestay For details about how the Distance function works see its description in the reference section Close the model don t save changes Offsets and Hydrostatics Analysis of the hydrostatic forces and moments acting on the ship hull is an important element of naval architecture MultiSurf includes capabilities for evaluation of intact hydrostatics and it connects through the Offsets view right click menu and Export OFE or Export OF4 to other AeroH ydro programs for further hydrostatic and hydrodynamic analysis Viewing offsets 1 Open DEMO 2 View gt Display gt Offsets 3 In the Offsets Options dialog click Add Deck Since we ll be running hydrostatic calculations from these offsets and the DEM O hull has no deck to enclose positive volume we ask MultiSurf to supply one for us 4 Read the warning message then move it out of the way The Offsets view Fig 24 shows transve
108. e model to get a feel for what has been accomplished so far Select the Top Profile semi circle curvel Feel free to re name this curve or any other object to help in identifying objects With Quick Points place a point on the arc at an arbitrary location Of course a point on a curve is a Bead With that Bead in the Selection Set Ctrl Select the PolyCurve which represents the Lower Profile Insert Bead m Copy Bead A Copy Bead is Inserted at the same t location as the parent bead but on the new curve Drag the bead on the Upper Profile and see the Copy bead move with it Side Trip Orientation Press O as a shortcut to Tools Options Under the sub heading Auto Orientation choose All Selected Entities OK Change to the z view Select the Upper Profile and the PolyCurve which is the Lower Profile Take note of the orientation arrow on both curves Arethey both pointing in the same direction They need to be so our cross section travels in the same direction on both curves If the arrows are pointing in different directions the easiest fix is to movethe one free corner of the lower corner to the opposite hemisphere If the point isin X space changeit to or visa versa March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 152 Procedural Surface Tutorial Creating the Cross section Construction Entities Back to the Cross Section 5 Selectthe Bead on the Upper Profile 6 Insert Point Projected P
109. e straightness was accomplished by 1 making sure p36 p46 and p56 were on a straight line and 2 making small adjustments in the Z coordinate of p26 at the bottom of the second control curve C2 until the curvature of profile vanished aft of midships according to the curvature profile display To see how this works amp x 8 and Point nametags on and Curve nametags off 9 Click p26 10 Lower dz by 02 to 1 000 The curvature profile for profile updates showing a small amount of positive curvature concave downwards aft of the third master curve and asmall amount of negative curvature concave upwards at the stern 11 In thecurvature profile window click the up arrow of the scroll bar a few times to zoom in on the display Fig 39 C spline Curve profile o ivf Fig 39 12 Edit p26 again Raise dz by 06 to 0 940 13 Inthe Curvature Profile window drag the box in the scroll bar down to the bottom to see the entire range of the profile Now the pattern is reversed itis slightly negative aft of thethird master curve and slightly positive at the stern 14 Zoom in on the Curvature Profile display a bit again Fig 40 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 142 Marine Design Examples Preference for Degree 3 B spline Curve Control Curves C spline Curve profile Fig 40 15 Undo twice to restore p26 to its ori
110. easy to hide the entire component if we want to clear out the drawing while working on some other part of the modd 5 The Property Manager heading changes to Multiple Edit change layer to 1 Although the component consists of 8 objects only the final one surface deck is visible Fig 3 This is because the other 7 objects are all hidden in the component file Fig 3 This is a crowned deck made from an Arc Lofted Surface It attaches to the supporting surface through an Edge Snake the first generation parent of the component This deck component would fit on any hull as long astheu v orientation of the surface to which it is attached in this case the hull is the same as for the DEM O hull surface i e u from sheer to keel v from bow to stern To seethis 7 Select hull and look at its orientation marks 8 Milo Euit Show AIl to seethe deck master curves p 9 toturn on Curve Nametags The 3 master curves for deck are the EdgeSnake nO the RelCurve cO and the ProjCurve cl K 10 or Edit gt Undo to hide the deck support objects and keep the picture less duttered 11 Turn off the nametags as well 12 Expand the Components heading in the Entity Manager and thetwo added components can be seen From herethey can be re ordered deleted selected March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 164 Working with Components Cabin shown hidden ma
111. eel between them using a snake on the bulb for thelower edge of the keg surface 1 Open BKRYO Fig 15 Here hull is a B spline Lofted Surface with five B spline Curve control curves bulb is a 180 degree revolution surface using a Type 4 foil curve as its meridian March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 120 Marine Design Examples Sailing Yacht Keels 9 Fig 15 xd or lt gt view Zoom in on the bulb Hide the surface bulb green This allows you to see meridian dark cyan making the top edge of bulb Show bulb again and select it Notice the surface orientation This showsthe origin of bulb is at the pointed aft tip and u runs along the meridian edge Foil curves and snakes all have their t 0 end at the trailing edge There are 2 arrow heads in this view The one pointing to the right shows the direction of u Theone pointing to the left is the head of the surface normal arrow Zoom to where the whole keel surface is in sight s Curve nametags The control curves for keel are the Projected Snake keel root on hull the Foil Curve mid the Projected Snake keel_rootl on bulb e Curve nametags This model will hang together through many possible parametric changes 10 11 12 changes in the control points of hull changes in the diameter length and position of bulb changes in the chord thickness a
112. eep it 9 Edit Attributes and put the component on layer 7 10 Clear the Selection Set Fig 9 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 176 Working with Components Paint job Notice that the mast comes down onto the deck through the cabin Fig 9 Let s step it on the cabin top instead 11 12 13 14 15 16 17 18 19 Q Zoom to Area and zoom in on the cabin Select the Magnet m0 red at the base of the mast si gt Projected Magnet to project a magnet onto the cabin top Point m0 pre selected Magnet Surface ctop Mirror Surface ctop lt OK gt R Place the arrow at the back of the mast and when the cursor changes to double click to edit the line sail_track Remove m0 from the Selection Set and add the new magnet Be sureto move the new magnet so that it is listed first in the Selection Set lt OK gt Fig 10b File gt Save COMPONENTBOAT This should match our model COM PBT6 M S2 Zoom to Fit again lt F5 gt to show the symmetry images Close SLOOP2 do not save changes if any Paint job Guess we re ready to throw her in the water but we ought to paint the bottom first 1 2 F5 to remove symmetry images and preselect the hull File gt Component gt Load gt PAINT1 MC2 in X MultiSurf Tutorials folder In the Resolving Parents dialog C spline Lofted Surface hull is preselected as a support OK March 24
113. ensional object straight or not straight In MultiSurf all curves induding Curves and Snakes have points including as appropriate Points Beads Rings and Magnets as parents degenerate curve or snake Normally a curve consists of a continuous 1 dimensional set of points Under special circumstances a curve can collapse into only asingle point for example aline from point A to point A Such a collapsed curveis called degenerate degenerate edge Normally each edge of a surface consists of a 1 dimensional continuous set of points Under special circumstances a surface edge can collapse to a single point for example aruled surface between a curve and a point Such a collapsed edge is called degenerate degenerate surface Normally a surface consists of a continuous 2 dimensional set of points Under special circumstances a surface can collapse into only a 1 dimensional set of points for example a B spline Lofted Surface between two point entities or just a single March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 183 Glossary of Terms Working with Components wrap up point for example a Tangent Boundary Surface made from four identically located control points Such a collapsed surface is called degenerate dependent entity Any entity that is defined in terms of another support or parent entity If you change any entity the program automatically updates all of its dependents Same as chi
114. ere between 1 and 2 feet 8 Click Q and dick the center of the cross on the intersection of M C1 and waterline This centers the model on that point Now when we zoom the intersection will remain pretty close to the center of the zoomed image 9 Press lt PgUp gt a number of times or use the wheel to zoom in You can also use the e button and continue to drag a box around the intersection but it can get alittle confusing trying to figure out what grid line you arelooking at Using the PgU p key allows you to keep track of that better March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 65 Interacting with Models Realign stations As you zoom in you will noticethat the grid will adjust as the magnification increases After about 9 presses you should be able to see that the intersection is between 1 6 and 17 10 Do about 9 more lt PgUp gt s The grid should have subdivided to 01 and you should seethe waterline crossing is between 1 61 and 1 62 almost at 1 62 If the intersection is drifting from the center get in Zoom to Area mode and click on the intersection again 11 Do about 9 or so more lt PgUp gt s The grid will subdivide again and show the crossing is just about 1 619 that s close enough This will be the value for Distancefrom M irror Surfaceto first contour below Now wecould go to the aft end of the waterline and do the same thing but we ll do it another way 12 e to show the origin
115. erline and which durably joins the hull at its edge March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 72 Interacting with Models Tutorial wrap up March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 73 Introducing More MultiSurf Entities Overview In the first three lessons you ve been introduced to MultiSurf point entity and a few simple curves and surfaces One of the big advantages of MultiSurf is its support of a variety of curve and surface types which have uses in a wide range of different design situations Our purposein this lesson is briefly to introduce some of the other entities so you ll have a better sense of what MultiSurf has to offer Some of the model files used in this tutorial are found in theX Examples folder These files are also used in the Entity Descriptions chapter of the main manual Entity introductions Arc explained B spline Curve explained B spline Lofted Surface explained B spline Snake explained C spline Curves explained C spline Lofted Surface explained PolyCurve SubCurve Concept and Function introductions S cursor shape Ctrl A gt shortcut key Degree 1 C spline does not meet points in graphic view Drag magnet How to make Degree 1 B spline meet points Polyline display Quick Spline Modeto make Quick Snake Reverset distribution with SubCurve Select gt A Show Hide gt H ide Points gt Show Points SubCurve change curve parameterization Surfaces
116. eroHydro Inc Marine Tutorials User s Guide e 132 Marine Design Examples Skin Deduction by Offset Surfaces You may have noticed that the lower u 1 edge of the Offset Surface has a hollow appearance forward near the forefoot This is because of the large amount of twist in the hull surface in this area Because of the twist the edge of the Offset Surface winds up crossing over the centerline The Offset Surface at the centerline is a smooth curve though To see this let s look at the Y 0 buttock 8 Create a Contours object parallel to the Y 0 plane Name buttock0 Mirror Surface Y 0 Index of first contour 0 Index of last contour 0 Signed distance from Mirror Surface to 0 index contour 0 Contour spacing 1 Surfaces to cut inside Display gt Color dark cyan lt OK gt 9 Y and Zoom In on the bow As you can see the centerplane buttock is a smooth curve Fig 27 uu The part of the Offset Surface in buttock0 negative Y would not beused in edge of 3 making patterns Offset Surface 10 Set Tools gt Options Performance Model Divisions multiplier to 4 f MC1 Fig 27 We have increased the divisions to 40 by 80 on both surfaces hull divisions 10x1 20x1 multiplied by 4 40 by 80 inside divisions 5x2 5x4 multiplied by 4 40 by 80 For this model this is an appropriate number of divisions for making drawings that will be used for cutting actual parts
117. es AeroHydro Inc Marine Tutorials User s Guide e 138 Marine Design Examples Cylindrical Transom Cylindrical Transom In yacht design a transom is usually a portion of a cylinder most often circular When drafting lines the conventional procedure is to fair the lines to a last transverse station near or just beyond the transom then locate the intersection of the hull surface with thetransom cylinder Our preferred approach in MultiSurf isto create the cylindrical surface transom_cyl create a snake transom edge on this surface then usethe snakefor the last master curve on the hull This approach has the advantage that the hull surface ends cleanly at the transom edge with nothing extra to betrimmed off 1 Open CylTran This is a 3 master curve C spline Lofted hull derived from DEMO by replacing the last master curve with a snake on a cylinder Fig 36 2 You may want to turn on various nametags show and hide various parts of the model and look from other view points as you follow the discussions below Fig 36 The transom cylinder transom_cyl isa Translation Surface made from an A rc circle and a Line transom d Since one of its basis curves is a line the Translation Surface is a cylinder To make it a circular cylinder a0 the Plane the Arc lies in is perpendicular to transom_cl Here are the steps we used to make the cylinder 1 Insert point pO on the centerline 2 Insert po
118. es SubCurve PolyCurve Ruled Surface A EI Seo Lat 15 10 ClosePolycurve2 Do not save Fig 11 C spline Curves A C spline Curve is a freeform curve that passes through a series of control points asan Arc Type Arc through 3 points does but a C spline Curve can have any number of control points C splines as curves snakes and lofted surfaces can be of three types Degree 1 linear Degree 2 quadratic or Degree 3 cubic 1 Open CSPL1 3 MS2 This shows C spline Curves of all threetypes based on the same set of points Look at the Left and then the Front views these show an important property of C spline Curves if the control points all liein a plane so does the curve 2 Return to the e view The Degree 1 C spline Curve cyan is just a Polyline connecting the points Note the Degree 1 curve itself is made of an infinite number of points and does indeed pass through all its control points The screen display though is made with only 32 divisions the same as for the other 2 curves in the model and it doesn t hit the points Try this 3 Click to select the cyan C spline Curve type1 to edit in the Property Manager 4 Change divisions to 64x1 The display is better and with 255x1 divisions it
119. es so we see both vertical and horizontal grid lines in this case Notethat G is a toggle pressing it again would toggle the grid off leave it on for now Making the chine another C spline Curve To create a ruled surfacefor the side we need two curves between which to make the side panel So we will create another C spline Curve 1 F5 to turn Symmetry Images off 2 Takethe or Y view 3 Click to turn on Quick Spline Mode The coordinates of the moving cursor are displayed on the status bar at the lower left hand corner of the workspace 4 Le smove our cursor to around X 0 83 and Z 0 17 and click to place our first point 5 Placetwo more points to the left roughly down the X axis Don t forget to double click the last point to end the curve and don t worry about the location of these points we will fix that next 6 Return to Select Mode You may have hit 0 83 0 0 17 exactly but then again you may not have In many cases placing a point by eyeis perfectly adequate but in this case we want everyone working with the same model so to keep things even March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 35 Making a Simple Model Making the side surface 7 Click on thefirst point you just created to edit in the Property Manager and set Name c1 dx 0 83 dy 0 dz 0 17 lt OK gt This is in fact often the way we locate points either by creating them or dragging them We inse
120. es pane or the Surface Manager This places the Point s2 in this field and brings up a box with two choices Since we will be changing the values of dx dy and dz this choice does not matter Preserve Absolute Location keeps C2 whereit is in space and adjusts the values to match Preserve Offset Values keeps the values and moves the point to match 5 Set dx 0 dy 0 25 dz 1 50 lt Tab gt from cell to cell 6 Press Enter or click lt OK gt to accept the location The special thing about the relationship we ve just set up is that C2 now stays in its specified relationship to s2 To demonstrate this 7 Try dragging s2 around a bit Notice that c follows it moving by just the same amount so it stays 25 units to the left and 1 50 units under s2 Note also March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 36 Making a Simple Model Making the side surface when dragging s2 how sheer and chine update and adapt to the new positions of s2 and c2 8 Undo the change with or Edit Undo 9 To create another relationship Edit the last point on the chine curve Rename the point c3 Click in the Point field of the Parents box Click the point s3 fromthe graphics view the Entities Manager This places the point s3 in this field Click either button from the Preserve absolute location or offset values box Changethe location of c3to dx 0 17 dy 0 25 dz
121. essing PgDn gt moves the camera outward these are changes in radius the orbit sphere gets bigger and smaller Tilt March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 12 Views and Viewing Controlling the view Tilt cannot be controlled directly by any key Itis alwaysO in Z axis vertical mode except as noted above Tilt can be set for the Home view in Tools gt Options Model Home View Smaller Motions To move by smaller increments hold down Shift while pressing the regular motion key s Home If you get lost or want to get back to the beginning Press Home or choose View gt Mechanical or Marine Orientation Home to restore the original view If you want to change the Home view go to Tools Options Model Home View and set Latitude Longitude and Tilt Degrees per Keystroke In Z axis vertical mode pressing an arrow key changes the latitude or longitude the number of degrees specified in Tools Options Performance Degrees per keystroke If latitudeis changed longitude remains unchanged and vice versa In Freetumble mode the model rotates around imaginary axes that are vertical and horizontal in relation to the plane of the screen Because of this the latitude and longitude changes are unpredictable If the rotation happens to be perpendicular to one of the model axes then the latitude and longitude will changethe way it does in Z axis vertical mode but only while the rotation remains perpendicu
122. et Now when you rotate the model all you can see is the surfaces 5 To show the hidden objects this time click o or Show Hide gt Show All Theside trip behind us 6 Rotate the model to see the bottom 7 Turn off Symmetry Images with lt F5 gt Well our boat is bottomless no more but still wouldn t float the next step is to build atransom for it Thetransom too has to join the sides and the bottom in a watertight seam Creating the transom surface We will make another Ruled Surface for the transom We will start the construction by creating an Edge Snake Snakes are curves constrained to lie on a surface an Edge Snakeis a special line snake lying along one complete edge of a surface We d liketo preselect side but what happens when you try clicking on side Nothing happens right Why can t you select it Remember those class filters we set to just Points and Curves so we could hidethose kinds of objects and just seethe surfaces Well the filters are still set that way You can see immediately that the filter for Surfaces is turned off by looking at theFilters toolbar The Surfaces filter is dark gray meaning OFF the Points and Curves buttons are light gray meaning ON To be ableto select surfaces we could just dick the surfaces filter button ON but instead let s reset the filters so we can select all kinds of objects 1 Select Reset All Filters or lt Ctrl F gt is quickest Although this option sets all fil
123. f hull Xcontours stations Zcontours waterlines In the original model DEM O M S2 the group of component objects depended on some objects not in the group namely hull depended on three master curves When the component was made we disconnected it from these three Parents So when we load this component the connection to three Parents needs to be reestablished The component knows its Parents were three curves so in the Parents Resolution dialog MultiSurf only allowed us to select objects that can serve as a curve that is a point a line a curveor a snake Deck Let s add a deck We happen to have onethat we saved as a component from a racing yacht 1 Rotate the model so you can see the top of the hull March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 163 Working with Components Deck We will need a support for the deck component the hull is already preselected so 2 File gt Component gt Load gt DECK1 MC2 from MultiSurf Tutorials 3 Inthe Resolving Parents dialog CloftSurf hull should be filled in for the required surface support if it isn t select it now from Available Parents list box lt OK gt 4 Inthe Resolving Names dialog no name conflicts are indicated but a component name of Hull is needed then click lt OK gt While the whole deck is still selected let s put the entire component on its own layer which can have several advantages For one thing it makes it
124. fficients The coefficients and the 96 waterline positions of LCB and LCF are dimensionless but the other quantities have units which are determined by your choice of M odel Units For example when your M odel Units are Feet Pounds and you givethe specific weight in Ibs ft as in this example volume will be in cubic feet displacement in Ibs GM in feet and righting moment per degree in ft lbs If the M ode Units are M eters Metric Tons and you give specific weight in tonnes meter displacement will be in tonnes and righting moment per degree in tonne meters You can savethesetext results by right dicking in the H ydrostatics window and choosing Save As Text and you can print that file using Windows WordPad or Notepad 2 Close the model don t save changes For a more complex model 3 Open SAILBOAT ms2 4 View gt Display gt Offsets no deck no bottom Note how the station polylines automatically follow the exterior envelope of the keel hull deck and cabin Portions of surfaces that are enclosed by other surfaces are omitted for example the part of the hull enclosed by the keg and the part of the deck enclosed by the cabin Close the model Skin Deduction by Offset Surfaces One off boat hulls plugs and prototypes are usually molded over a set of transverse frames or mold frames Because the material of the hull frames and planking or core material and skins as well as temporary mold materials suc
125. form The shape and layout of an airplane s wing or a ship s keel point A non dimensional location in space In MultiSurf points are 2 parent entities each defined in relation to a Point and a Frame pole A degenerate edge of a surface At a pole one set of parameter lines u constant or v constant converges to a point For example the apex of a cone or either pole of a sphere made by revolving a semicircle about the line joining its endpoints A poleisa common form of coordinate singularity polyline A broken line consisting of 2 or more straight line segments joining a series of points Polylines can be 2D the points have 2 coordinates usually X and Y or 3D the points have 3 coordinates predefined entity An entity which is defined internally in MultiSurf and which can be used asa support entity without a user needing to create it Examples point at the origin xT bead ring at t 1 end of curve snake X20 plane at X20 Predefined entities March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 189 Glossary of Terms Working with Components wrap up don t display in the drawing so you must select them in the A vailable Entities pane Same as internall y defined entity profile profile line Nav Arch The outline of a hull in side view particularly the edge of the hull surface at the centerplane profile view A horizontal orthographic view of a scene from either side Nav A
126. from subtleto dramatic of hull shape while retaining the existing shape of the sheerline profile and master curves 1 3 and 5 8 Remove the point nametags hide the points turn on symmetry images and rotate around the model Before closing this model let s be sure we re all together on program settings March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 111 Marine Design Examples Bow Rounding Check program settings This is what you should have On the View menu Axes and Status Bar should be ON preceded by a checkmark to turn an option on simply click on the menu item or if it has a box next to it click on the box All Toolbars except Mechanical View Orientation should be ON To check this click on Toolbars A toolbar is on when checked On the Tools gt Options General tab Set Rotation Constraint to Free tumble mode On the Tools gt Options Dragging tab All the snaps should be ON Prompt after drag should be OFF no checkmark Close the model do NOT save changes Bow Rounding It is unusual for a hull to come to a sharp edge at the bow as DEMO and CLFT5XA do partly because a sharp edge is both vulnerable to damage and prone to inflict damage and also because it is difficult to fabricate with most materials With MultiSurf we can define the rounded region in detail Hereis one way 1 Open PROJCRV1 Thisis a modification of DEMO with M C1 moved off center and a Ruled Surface added to make a ha
127. fted Surface chine strake 2 7 Curve nametags The four curves sheer chinel chine2 and profile are the basic framework of this design The upper pair and lower pair define the two developable panels Between chinel and chine we have built a C spline Lofted Surface using 4 B spline master curves The C spline Lofted Surface accurately joins the C spline Curves chinel and chine2 because it is composed of C spline curves in the longitudinal u constant direction The four middle control points p31 p32 p33 p34 are conveniently located to achieve approximate tangency between the three surfaces These control points were carefully positioned in the X view while observing the smoothness of the stations red Contours as they cross the chines 3 Tools Mass Properties shows the surface areas March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 119 Marine Design Examples Durably Planar Transom Durably Planar Transom With RCSHO still open itis also interesting to note how a durably planar transom was achieved 1 Wecreated a 3Point Plane tr_plane for thetransom to lie in specifying it with the points p14 sheer point on last master curve pp14 and p54 centerline point on last master curve Fig 14 Our use of p14 and its perpendicular projection onto the centerplane pp14 ensures that the 3 Point Plane will be
128. gent to its polyline at t O pl arc5 the Type Arc tangent at point3 end arc is tangent to its polyline at t 1 p3 5 Select p3 and move it around Notice that the arc curves maintain the respective tangencies no matter where you move p3 6 Reset Auto Orientation to Single selected entity 7 Close ARC4 5 ms2 Semi circle start center plane guide 1 Open ARC6 ms2 This Type Semi circle start center plane guide arc Fig 5 is a semi circle made from the same set of points as in ARC3 ms2 This type of arc starts at the first Control point start uses the second Control point center as its center and lies in the plane of the 3 points The third Control point plane guide is used to determine which of the two possible semi circles you ge always the one that passes closest to thethird Control point March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 79 Introducing More MultiSurf Entities start at t O Semi circle start center plane guide Z plane guide center Fig 5 Arc6 ms2 SubCurves 2 Drag plane guide to other locations and watch the behavior of the arc semi circle 3 Close the model remember don t save changes SubCurves Sometimes you need to use just part of a curve in constructing another object This is done with a SubCurve delineated by two beads x 5 oo 1 Open SUBCURVE1 msz2 Fig 6
129. ginal location This restores the aft end of the curve to straight What you ve been seeing is typical behavior for a C spline Curve To get it to run accurately straight over some interval there has to be a knot at the end of the interval and any control points inside the interval need to be on a straight line then you have to fiddle with the position of the next control point outside the interval to remove any waveor oscillation between control points Close the model don t save changes Preference for Degree 3 B spline Curve Control Curves The higher the order of a spline the smoother the curve but the less tightly it is related to its control points A Degree 1 spline can have abrupt changes discontinuities of slope a Degree 2 spline can have abrupt changes in curvature A Degree 3 spline must have continuous curvature i e with no abrupt changes For many years for our previous hull design program Fairline 2 we promoted use of Degree 2 splines for control curves Our preference lay with Degree 2 as having sufficient smoothness for transverse sections while being very transparently connected to the control points by the midpoint tangency property However for several years we have been developing a growing appreciation for Degree 3 master curves and now prefer them and usethem for most hull design purposes The experience leading to this preference is mostly subjective We have been involved in many hundreds of fitt
130. graphic picture on the screen can be saved as a DXF file To see how it s done 1 Choose a view that you like Then pick File gt Export 2D gt DXF The Export 2D Options dialog box appears offering Fast or A ccurate calculation during the save a check box that allows you to keep the Save M ode if you changed the mode and want to export in that mode the next time All Visible Objects or March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 19 Views and Viewing View lines plan Selection Set Only the Point size of the exported lines and an Identifying M essage if you want to add one 2 We ll use the defaults Fast All Visible Objects and Point Size 1 so just click lt OK gt The File Save As dialog box which appears next looks and works like the File Open dialog 3 Typein the filenamedemo1 Make sure the folder specified is Marine Tutorials Then press Enter or click lt OK gt View lines plan Naval architects have a conventional way of displaying hull forms as alines plan To view this boat as a lines plan Pick View gt Display gt Ship Lines MultiSurf opensthe ShipLines Parameters dialog For details see Ship Lines in the Marine section of the paper or online User s Manual For now accept the defaults by pressing lt OK gt MultiSurf opens a second window which becomes the active window and displays the ship lines view in it Fig 10 Thelines plan shows 3 orthographic views with the same set of pl
131. gt Line Snake or Insert gt Snake gt Line Snake Name cove stripe End magnets preselected lt OK gt Edit the endpoints of the new cove stripe 6 Click m7 u 05 v 05 7 Click m8 u 05 v 95 The model has a nice magenta cove stripe Fig 14 You can adjust its position and appearance by dragging the magnets The magnets and the cove stripe will continue to lie accurately on the surface even if you change the shape of hull ic Fig 14 w 8 If you d liketo File Save As DEMOS lt Yes gt to replace an existing file We re finished with this series of edits so Close this model Add a deck surface In this tutorial we ve had occasion to create points beads magnets curves and snakes Let s go out on a high note by creating another surface for DEM O the deck Change hull visibility 1 File gt Open DEMO ms2 from the MARINE TUTORIALS folder 2 Double click hull to edit its definition 3 OntheDisplay tab under Visibility turn on Boundary and turn off u constant We re just getting rid of some lines so we can better see what we are doing Fig 15 Fig 15 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 68 Interacting with Models Add a deck surface Create 2 deck beam master curves Create support points for the middle deck beam master curve 1 Press the Down arrow 5 times to get to Go to Lat 20 Lon 60 x 2 Point Nametags 3 Preselec
132. h as ribbands and temporary core intervene between the finished outer surface of the hull and the contours of the mold frames the mold frames need to be undersized by a thickness deduction In atypical male molding process the deduction would comprise the thicknesses of ribbands plus core plus outer skin It is incorrect to make this a constant deduction in the transverse plane this would not take into account the local bevel of the hull The deduction needs to be taken perpendicular to the local hull surface The Offset Surface is the key to making frame patterns with thickness deduction If a Single Offset is used the Offset Surface will be parallel to its basis surface and a constant distance away from it If this constant offset is equal to the required thickness deduction sections cut on the Offset Surface will have the correct thickness deduction including the appropriate allowance for bevel Hint An Offset Surface will be smoother and more accurate if it has the same number of divisions as its basis surface in both u and v directions March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 131 Marine Design Examples Skin Deduction by Offset Surfaces Let s make patterns for the DEMO hull with a 2 ft frame spacing and a skin deduction of 0 200 ft 1 Open DEMO 2 Select the hull surface On this C spline Lofted Surface u is along the control curves and v is longitudinal The normal orientation arrow shows that the posi
133. he Selection Set 2 n gt Mirrored Curve or Insert Curve Mirrored Curve OK to accept the defaults 3 Zoom to Fit Fig 11 This should match our distribution model TANPLANE2 ms2 el Fig 11 In this case we ve made both ends of a B spline normal to a plane then mirrored that spline across the plane resulting in a loop completely symmetric and smooth The combination of the B spline Curve ending normal to the plane plus the mirror symmetry makes the joins G2 continuous slope and curvature 4 Close the part don t save changes Tangency and Mirrored Points In this example we ll use Mirrored Points to establish tangency between both ends of two B spline Curves making a very flexible loop 1 File gt Open TANPOINTS1 ms2 from Tutorial Files 2 Select pt2 and makea gt Mirrored Point or Insert gt Point gt Mirrored Point March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 101 Building Tangency with B splines Tangency Between Surfaces Name pt5 default Point pt2 pre selected Mirror pt1 OK 3 lt F gt ZoomtoFit 4 Makea second Mirrored Point this time using pt3 as the Point and pt4 as the Mirror 5 Select pt1 pt5 pt6 and pt4 in that order 6 Makea n gt B spline Curve Check that the control points are listed in the correct order if they are not select them again now OK to accept defaults Fig 12 This should match our distrib
134. he left side expands to show where you are in the documentation system Prowl around the help system a bit if you d like Click on one of the other topics Click the Index and typein a keyword Click Search and type in a keyword or keywords Click to closetheHelp window Four ways to zoom Suppose we want to zoom in on the bow of the boat Here arethree ways to do that Keys 1 2 Choose View gt Marine View Orientation gt Starboard to get a profile view bow to the right Then press lt Ctrl gt right or left arrow several times to ge the bow centered in the window remember you don t haveto wait for the program to redraw between key presses Fig 7 left Now you can press lt PgUp gt to zoom in Fig 7 right PgDn to zoom out again or usethe wheel Fig 7 If you did not get the nose precisely centered you noticed thetip drifting off of center Here s another method Zoom to Area 1 or lt F gt to Zoom to Fit We should still be in Starboard view so the whole boat should be visible and facing right 2 First imagine a rectangle surrounding the area you want to enlarge March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 17 Views and Viewing Four ways to zoom 3 Choose Q or right click and choose Zoom to Area or choose View gt Modify gt Zoom to Area The cursor changes to QA 4 Place the cursor at one corner of the rectangul
135. he top of the transom yellow is definitely too curved Let s look a bit closer at how the transom is made 5 6 10 11 12 13 14 15 16 x Click Xx to clear the Selection Set and to turn Point Nametags back on Select magnet m1 it s piled with pO at the top of the transom on the centerline you ll need to answer the Which Entity dialog Click 9 Show Hide gt Show Parents This displays the cylindrical basis surface dark cyan on which we have outlined the transom shape The cylinder sits in the frame and the transom itself is a SubSurface on the cylinder To see better let s get the hull lines out of the way for amoment Click F and w to turn on the Surfaces and Contours filters Click hull to select it if you just dick on one of the green u constant lines you can avoid having to answer the Which Entity dialog lt Ctrl click gt one of the red stations lines to add the station contours to the Selection Set 9 to hide them Fig 12 Clear the Selection Set The transom edges are formed by two snakes yellow and magenta whose T control points are the magnets m1 i m6 The magenta snake also plays the role of thethird master curvefor hull It looks as though m3 is simply too low Solution move it up We ll needthehull surface and contours for reference so TOUS let s show them again MEM S Hereis an easy way to show hid
136. hem m4 and m5 aretwo additional magnets on transom_cyl and transom top magenta is a B spline Snake made from m0 m5 and m4 Here s what we did 1 Insert the magnets in their rough positions on transom d 2 Insert the B spline Snakes Or combine 1 and 2 and use Quick Spline mode 3 Edit hull Control curves MCT MC2 and transom_edge 4 Dedete MC3 P37 P32 P33 and P34 asa group 5 Adjust the locations of the magnets until the B spline Snakes make the exact desired transom edge shapes 6 Make a Line Snake transom_ctr using magnets m3 and m4 for supports 7 Make a Trimmed Surface using transom top transom edge and transom ctr 8 Thefinal step is to hide transom cyl and seethe beautiful result Close the model don t save changes March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 140 Marine Design Examples A Planing Powerboat A Planing Powerboat 1 Open PLANE1 2 amp or View gt Nametags Surface The surface names may be easier to see if you dick for Wireframe view This is a planing powerboat model made from two C spline Lofted Surfaces topside and bottom and one narrow Ruled Surface flat Each of the C spline Lofted Surfaces has 5 control curves Except for the bow all the control curves are 3 point B spline Curves Return to Shaded view im 3 amp and Se Surface nametags off an
137. here is a more detailed discussion of this model in Tutorial 6 Superstructures File gt Close the model do not save changes Moving a bulkhead Let s do another one 1 Open BULKHD1 MS2 from the Marine Tutorials folder 2 F5 to seethe other half of the boat Fig 12 AT Se a i n Fig 12 BULKHD1MS2 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 25 Views and Viewing Tutorial 1 wrap up This model includes a hull a deck and a bulkhead that meets the hull and deck surfaces in watertight joins We ve made a bulkhead now we want to move it There is a green point where the X axis intersects the bulkhead It controls the longitudinal position of the bulkhead You can find out its name without our telling yOU x 3 Click or View gt Nametags Point 4 Click and hold on the green point e0 5 Drag e0 forward a little What you get is one repositioned watertight bulkhead that is still watertight 6 Drag e0 about 3 4 of the way back toward the stern Now we have moved the bulkhead to the stern of the boat and you can see that the bulkhead still joins the hull and the deck accurately no gaps 7 Click Edit gt Undo twice and the bulkhead returns to its original position In this model the bulkhead surface is connected through a series of relationships to the point eO therefore when you move the point the bulkhead moves e0
138. hollows or abrupt changes in curvature filter A tool that allows only entities matching the filter to be available for selection in graphics and Available Entities pane views E g the Points Filter allows points to be available the Current Layer Filter allows entities on the current layer to be available Filters are additive Applying or changing filters does not affect entities already selected frame entity A local orthogonal x y z coordinate system A frame can be displaced and or rotated with respect to the global coordinate system GO continuity Two curves or surfaces joining without tangency G1 continuity Two curves or surfaces joining with tangency G2 continuity Two curves or surfaces joining with tangency and continuous curvature across the junction generation 1st 2nd of parents children When we talk about parents or children of an entity we usually mean the direct or first generation of them These are the parent entities you select in the March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 185 Glossary of Terms Working with Components wrap up Insert Entitiy dialogs and the parent and child entities listed in the Parent Child dialogs But beginning with any one entity parent and child relationships may continue on indefinitely eg first generation parents their parents second generation their parents third generation etc host entity If entity A is embedded in ent
139. how Hide gt Show Selection Set or lt Ctrl W gt or Right click on side in the Selection Set pane and choose Show Presto there s our side again 4 Select Both to turn on both Hidden and Visible filters 5 Pick P or lt Shift X gt view 6 Click on s2 the point midships on sheer and drag it outward someto a new position Make sure you click on s2 and not its symmetry image which because it is just an image will not drag 7 Notethat the side stays slanted the seam between the side and the bottom stays watertight the bottom stays flat across the centerline As we mentioned before these are durable qualitative properties of our model which have resulted from our particular choice of entities and dependencies s a Edit gt Undo to undo this last change And it stimefor another side trip Filters 2 While we re here let s do one more demonstration of filters Let s say you wantto see just the surfaces of this model and none of the points curves or planes Y T 1 OntheFilterstoolbar click and to turn off Points and Curves filters March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 41 Making a Simple Model Creating the transom surface 1 2 Click 2 to invert the filter selection Points and Curves filters back on all the rest off 3 Left mouse click and drag a box around the whole model This puts all points and curves in the Selection Set 4 Click 9 or Show Hide gt Hide Selection S
140. iate distribution file see MultiSurf Tutorials Introduction Taking a break The intermediate M S2 files for Working With Components livein the MultiSurf X Tutorials folder MultiSurf Tutorials Introduction contains information about taking a break what to do if your screen doesn t match our instructions basic terminology typeface and symbol conventions and troubleshooting When you Save SaveAs or Export files in this tutorial you may ge a Replace existing file query If you do it just means someone has already run the tutorial and saved a file under that name Go ahead and replace the file Let s go The beginning model MultiSurf for SolidWorks Users When MultiSurf is integrated with SolidWorks the component feature operates the same as detailed in this exercise For this Tutorial weask that you run MultiSurf in the Stand alone mode for simplicity s sake In MultiSurf 1 File gt Open gt 3MCS MS2 from the MultiSurf Tutorials folder This is a set of 3 lofting curves 2 Switch to y view for a moment to see how they are different from the DEM O Master curves Fig 1 e The transom slants and ends below the design waterline DWL The bow is rounder 3 Switch back to Home view Fig 1 Check program settings Before we go any further let s all get together on program settings This is what you should have March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 160 Working with
141. ics white space of the Y view DEMO MS22 gt View gt Nametags Point to turn nametags for points on Click and hold on P11 the point at thetip of the bow and drag it around a bit Noticethat all four windows update simultaneously as the you drag the point Edit gt Undo and all four views update again File gt Close No to the save changes inquiry Before we end this tutorial let s do a couple of demonstrations of move a point presto change o model modifications you might do in real life March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 23 Views and Viewing Moving a cabin Moving a cabin 1 File Open 2CABINS MS2 it should bein the Marine Tutorials folder We ll usethis model for a weeintroductory demonstration 2 Maximize the window by clicking D 3 Click to zoom the model to fit Thisis the deck and cabin of a boat 4 Now press the function key F5 to see the symmetry images that make the other half of the model Fig 11 Fig 11 2CABINSMS2 Start by imagining that you as the designer had gotten this far with your design and changed your mind about where you wanted the cabin you now want to havethe cabin pretty far aft Would you believe you can do that right now by moving a single point Along the centerline magenta where the front of the cabin crosses it thereis a white point It is called rO Let s select this point and drag it aft 5 Place the cursor over rO a
142. ide coaming and sub ts2 to see the entirety of ts2 when you ve finished looking show them again Fig 20 We made another B spline Snake top bdry white on top surf to serve as the curved outline of the upper deck if you can t seeit try hiding top deck then show it again The upper deck itself top deck green is a SubSurface on top surf bounded by top bdry two line snakes ts aft edge and ts ctr along edges of top_surf and Magnet tml Fig 21 Then wehid top surf top bary Fig 21 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 126 Marine Design Examples Spars and Rigging Theflying bridge bulwark is another Ruled Surface coaming yellow using a SubSnake sub ts2 red of ts2 as its lower edge and a Relative Curve coaming top magenta based on sub ts2 asits upper edge Fig 22 You can hide coaming to see the basis curves coaming top sub ts2 Fig 22 Close the model don t save changes Spars and Rigging MultiSurf can be used to advantage in planning spars and rigging for sailing yachts 1 Open CUTTER This is a proposed cutter rig for the Hulldeck model you met earlier in these examples Fig 23 Here s how we made it We placed a magnet step bright white at bottom of mast on deck at the 40 waterline Contours based on the X 0 plane Then we deleted the Contours
143. iew Let s havea look 7 F5 toturn the symmetry images on 8 Rotate to seethe bottom as well Looks nice doesn t it but is it also watertight We argued earlier that the sides and the bottom joined in a watertight seam how about the transom The transom is watertight to the side since an Edge Snake lying on the edge of the side also forms an edgeto the transom And it s also watertight to the bottom since both surfaces are Ruled Surfaces whose end rulings are straight lines between the same two points March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 43 Making a Simple Model Locating the oarlock a Bead Locating the oarlock a Bead The boat is watertight but still not very useful until we can fasten our oars onto it we need oarlocks Oarlocks need to be located on the sheer and should stay there too even if we might later decideto change the sheer The entity to do the job is a bead a point constrained to lie on a curve 1 lt F5 gt to turn the symmetry images off 2 Select side green and hide it again 3 Preselect sheer 4 E gt Bead or Insert Point Bead Name oarlock OK to accept all the other defaults Now we have a bead for the oarlock at the midpoint of the sheerline default location Before we decide on the final location let s takea little side trip to explain how we specify the position of a bead along its curve The t parameter and tickmarks for a curve
144. imize the graphic display window Check program settings Before we go on let s check some program settings If we don t all start with the same set now what we say and what you see as we proceed will be different aargh The set we use are the program s initial defaults but since the program is customizable you may find differences if you or someone else has already worked with your program This is what you should have On the View menu Axes and Status Bar should be ON preceded by a checkmark to turn an option on simply click on the menu item or if it has a box next to it dick on the box All Toolbars except Mechanical View Orientation should be ON To check this click on Toolbars A toolbar is on when checked On the Tools gt Options Dragging tab All the snaps should be ON Prompt after drag should be OFF no checkmark Scale model One of the simplest editing operations is to scale the model uniformly in one two or three of the axis directions For example DEM O is a 30 ft sailboat hull Suppose we wanted a 40 ft sailboat One way to get this isto multiply the X coordinate of every point by a constant factor of 40 30 1 333 Let s do this and see the result 1 Edit gt Transform gt Scale The dialog box lets you set scale factors for X Y and Z For this example type 1 333 in the March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 52 Interacting with Models Scale model Transform factor for X field a
145. in Entity Descriptions in the MultiSurf User s Guide for more information 8 OntheTools gt Options Entity tab Quick Spline Defaults Click the B Spline radio button and make surethe Alternate spline creation is checked March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 81 Introducing More MultiSurf Entities SubCurves 9 With pt7 still in theSelection Set this sets the depth for the Quick Points Turn on Quick Spline Mode or lt S gt or Insert gt Quick Spline Mode 10 Hold the cursor over pt7 and click Because pt7 and pt2 are on top of each other in this view MultiSurf cannot tell which point you want to select for the first point of your spline The cursor changes to aoc to indicate this When you click you get the Which Entity box This box comes up any time MultiSurf cannot tell which entity you are interested in selecting and provides a list of entities at that location for you to choosefrom In this case select pt7 11 Continue clicking and creating a Quick Spline Try to match the PolyCurve with your B Spline Use as few points as possible Be sure not to place a point if the cursor changes toO 9 Doing so would put one of the spline points on the PolyCurve Finish by double clicking near the end of the PolyCurve If necessary drag the points around to dosely approximate the PolyCurve It doesn t haveto be perfect H ow many points did you use You probably don t need more than 7 or
146. ind out the X coordinate at that middle point We can use the mod amp d s Contours in the X plane stations as our information source They are an evenly spaced set of 11 stations starting at the forward end of the waterline ending at the aft end and numbered 0 to 10 therefore station 5 falls at the midpoint Let s calculate its X coordinate 1 Doubleclick on stations red either in the graphics view or the Available Entities pane If you use the graphics view you can tell when you are over a Contours entity when the cursor changes to RD March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 54 Interacting with Models Reshape the stem IntheEdit Entity dialog Signed distance from M irror Surface to 0 index contour the X position of station 0 18 and Contour spacing the station spacing 2 735 so station 5is at 18 5x 2 735 15 475 This is the distance we must shift the boat in the negative X direction to make X 0 be at midship Noticethat theM irror Surface is planel hidden In order to shift a contour must be built from an entity that will also shift Since default planes do not shift we had to create a 2 Point Plane for this contour and for waterlines we made a 2 Point Plane on the Z 0 plane 2 Cancel or lt Esc gt to dosethe Edit dialog without making any changes 3 Display the Grid 8 or lt G gt 4 Zoom Out so you can seethe shift 5 Edit Transform Shift Click the All transfo
147. indow The hydrostatics dialog prompts for five input quantities Specific W eight is the specific weight of water The default value is the specific weight of sea water 64 0224 Ibs ft in the DEMO modd s ft lb units Z c g is the vertical position of the center of gravity in the model s coordinate system This should really come from a summation of weights and vertical moments for the complete boat The default value of 0 zero is a reasonable guess for most ballasted sailboat designs Sink and Trim together specify the position of the boat relative to the water surface The default values of 0 zero use the Z 0 plane for the waterplane H eel is rotation of the mode about the X axis 180 to 180 degrees Positive heel initially raises the starboard positive Y side and lowers the port negative Y side of the boat For now just take the defaults offered for each of them MultiSurf opens a text window and displays the results These begin with a station by station tabulation of sectional quantities X position immersed section area March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 130 Marine Design Examples Skin Deduction by Offset Surfaces centroid of area wetted girth and waterplane width Then there is a tablethat echoes the input quantities and gives about 25 computed results wetted dimensions displacement center of buoyancy center of flotation wetted surface initial stability and several coe
148. ines with the number of segments determined by the product of the curve s Divisions and Sub divisions and surfaces are represented by a mesh of curves The DEMO model consists of 12 points yellow in this case 3 curves built from those points cyan in this case 1 surface built from those curves in this case weare displaying only the longitudinal family of curves 11 of them in light green and 2 sets of contours cutting the surface 11 transverse sections through the surface in red and 1 horizontal section in the plane Z 20 in magenta a total of 18 objects March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 10 Views and Viewing Controlling the view To return to shaded view just click im or choose View gt Display gt Shaded For the rest of this tutorial we will want the model in wireframe view so dick once again Controlling the view You can control many aspects of this 3D graphics view using the keyboard and the mouse The first thing to do however is to decide which method of viewing you want to use In Tools gt Options General tab under Rotation Constraint you can choose either Free tumble or Z axis vertical Free tumble mode In Freetumble mode the model rotates around imaginary axes that are vertical and horizontal in relation to the screen so the mode can appear to tumble when you rotate it Z axis vertical mode In Z axis vertical mode the model still appears to rotate but because the Z axis is
149. ing and lofting jobs during these years During the fitting process we apply various fairness tests especially normal curvature profiling We have encountered a number of cases where even though the fitted surface passes all objective fairness tests we can apply it still doesn t look right Often the problem would show up in a body plan with lots of stations In other cases there would be some waterlines or buttocks that looked somehow indefinably unhappy In every such case when we converted the master curves to Degree 3 we became happier with the lines Asan exercise in converting from Degree 2 to Degree 3 control curves we will load the DEMO hull three Degree 2 control curves and convert its control curves one by oneto Degree 3 1 Open DEMO 2 e X view and Zoom to Fit s 3 Curve nametags March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 143 Marine Design Examples Preference for Degree 3 B spline Curve Control Curves 4 Select MC3 5 View its Curvature Profile Fig 41 B spline Curve MC3 E Fig 41 As expected from the general character of the control curve the curvature is most intense near thetight turn of the bilge diminishing smoothly in both directions However right at the knot there is a discontinuity in curvature an abrupt change by approximately a factor of two This discontinuous curvature profileis typical of type 2 splines Let s capture a copy of the existing cont
150. int p1 using pO as its Point parent This point serves as the x axis of our frame sets the radius of the transom by serving as the center of the Arc and determines the rake of the transom We used polar coordinates and gave this point a lat of 16 16 degree rake and a rad radius of 8 3 Insert point p2 using pO asits Point parent Anywhere on the default frame s y axis will do 4 Insert Frame framel using pO p1 and p2 as parents 5 Insert Point p3 on framel s z axis and make a Line transom_cl from pO to p3 This line is perpendicular to framel s xy plane 6 Insert Point p4 to be used as the Arc s end guide p4 uses framel as its Frame parent and is placed on framel s y axis dy greater than the widest part of the stern 7 Insert the Arc using pO p1 and p4 as its parents This puts the arc in the xy plane of framel 8 Insert Translation Surface transom_cyl from the line transom d and the arc circle March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 139 Marine Design Examples Cylindrical Transom If you goto Shift Y gt or Y view you can move p1 at will by dragging or if you want more control you can changethe lat and rad using the edit dialog and change the rake and radius of the transom The transom surface m0 to m3 arefour magnets red on transom_cyl and transom edge magenta is a B spline Snake made from t
151. is allows you to edit the point in the Property M anager Change the name of this point to s1 short for sheer 1 Here s a printing convention We print the names of objects inside single quotes When you typein the name don t type the quotes just the name that s inside them 3 Change the location of s1 to the following coordinates dx 0 dy 0 dz 1 5 Press Enter or click lt OK gt to accept the location Don t worry if the point disappears from view Well show you how to see it and the other two after we have finished editing them March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 33 Making a Simple Model Making the side surface From here we will edit the location of the other 2 points to completethe Sheer curve 5 Click on themiddle point to edit 6 Change the name to s2 and change the location of s2 to the following coordinates dx 6 dy 2 dz 1 7 Again press Enter or click lt OK gt to accept the location 8 lt PgDn gt or useZoom In Out or Zoom to Fit which are available from either the View gt Modify menu or the Right Click menu or spin the wheel of your mouse if you havea wheel until the whole curve becomes visible 9 Edit the last point and change the name to s3 Again accept the other defaults for s3 and changethe location to dx 12 dy 1 5 dz 1 2 10 lt OK gt to the Edit dialog and or lt F gt or View gt Modify gt Zoom to Fit Here sthe rati
152. is most easily accomplished by selecting the next set of rings and pressing lt F4 gt or Insert gt Copy Last which repeats the last entity made Use F4 for the next step as well 9 Project all three Line Snakes on to the Y 0 plane Recall from projecting chine onto this same plane how to do this Select a snake choose gt Projected Curve select Y 0 as the Mirror lt OK gt 10 Create Ruled surfaces between the Line Snakes and their Projected Curves You should have this down by now 11 Drag the rings on the UV snake to move the thwarts along the length of the boat and to adjust their width XYZ Rings could be substituted to place the thwarts at an exact X position and to mode the width with precise dimensions Let s do this with the center thwart 12 Select the UV Snake snake 13 v gt XYZ Ring or Insert Ring XYZ Ring Name seat pos Ring Snake snake1 pre selected Location Constrain to X 3 25 lt OK gt 14 Select snake1 again and lt F4 gt or Insert gt Copy Last to make another XYZ Ring If you have difficulty picking seat pos as the Relative to constraint try using the Surface M anager or A vailable Entities pane Name seat width Ring Snake snake1 pre selected Location Constrain to X 1 Relative to seat pos lt OK gt To substitute the XYZ Ring seat pos in place of Ring ring3 we will use a function called Adopt Children We usethis when we want to replace one
153. ity B another entity of the same or higher dimensionality then entity B is the host of entity A A bead has a host curve a magnet has a host surface a ring has both a host snake and a host surface Converse of resident IGES file An ASCII disk file which serves as a data exchange format between CAD programs The IGES file is an international standard which is supported by a large number of CAD programs You can import IGES geometry with File gt Import gt IGES M ost of the surface and curve types and all supporting points arefully editablein MultiSurf Although there is no Edit dialog for some entities that can be translated and imported into MultiSurf these entities are relational entities with parents and you can change these entities in a more indirect manner inflection A changein the direction of curvature eg the point at which a curve changes from being concave to being convex internally defined entity An entity which is defined inside MultiSurf and which can be used as a support entity without a user needing to create it Examples point at the origin 1 bead ring at t 1 end of curve snake X 0 plane at X 0 Internally defined entities don t display in the drawing so you must select them in the Available Entities pane Same as predefined entity interpolation 1 Determination of usually approximate intermediate values between the entries in a table 2 A curvethat passes through a series of point
154. ius adjusting 12 radius of camera definition 11 realignment of stations 65 Relational Geometry 49 relationships captured in a model 49 remove entity from Selection Set 81 reshaping stem 56 stern 61 reverset distribution with SubCurve 80 rigging 127 component 175 right click in graphics white space menu 14 AeroHydro Inc Marine Tutorials User s Guide e 198 Index right click in Surface M anager white space 22 right click on entity menu 22 right click on entity gt H ide 39 right click on entity gt Show 41 rotating with mouse 13 rowboat 31 rub rail component 172 rudder component 170 RUL files 119 Ruled Surface 32 37 122 S sailboats 127 160 Save Offsets File M enu 130 scaling a model 48 screen doesn t match our instructions 2 Select gt A 1 79 Select gt Both 41 Select gt Children 22 Select gt H idden 41 Select gt Parents 22 Select gt Reset All Filters 42 Select gt Select M ode 33 selecting can t select 5 to put entity in selection set more than once 97 selecting choosing picking going to4 Selection Set pane 9 Selection Set remove entity from 81 sheerline durably planar alternatives 138 planar example 134 planar our recommended method 138 shift arrow keys 13 Ship Lines View Menu 20 show only Boundary lines on a surface 68 Show Hide Hide Points 82 89 Show Hide Hide Unselected 144 Show Hide gt Show Children 123 Show Hide gt Show Parents 63 Show Hide gt Show Points 89 Show Hide gt Sho
155. ke it a bump The rail is a Sweep Surface whose shape is defined by the Arc gshape March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 173 Working with Components Rub rail The shape of gshape is in turn determined by the location of its middle point gp2 gp2 is an Offset Point If we reverse the offset gp2 will jump to the other side of the hull inverting gshape and the rail along with it x 5 Turn off Curve Nametags and to turn on Point Nametags Note that since we gave the component the prefix g all its objects havethe same prefix 6 Double click gp2 to open its Edit Dialog and click on the Reverse Offset button There that fixed it 7 Now return to the y view Close up you can see another defect we probably want to correct the front edge of the rail is tilted aft it s not that way in GUARDI go look if you d like gm3 red is too far aft Why After all it s a Magnet relative to another Magnet it should have the same u v location on this hull as it did in GUARD1 Well it does 8 Zoom to Fit to seethefull profile view again Compare the bow profile with that of GUARD1 Therein lies the difference for the location of gm3 To fix our rub rail edge we can just move gm3 forward a little 9 Back in COMPONENTBOAT NS or lt F8 gt to return to the zoomed in view 10 If you need to zoom in closer until you can see the points easily Fig 8a 11 Besure All Snap
156. ks for the master curves you can see that the u constant lines the C spline Curves that make up the display of the surface pass through the tickmarks t and u 0 0 0 1 0 2 0 9 1 0 7 Look also at the Right view and lt F gt or Zoom to Fit Rotating the model from this view notice that the surface passes through each of its control curves Close the model March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 89 Introducing More MultiSurf Entities B spline Lofted Surfaces B spline Lofted Surfaces The B spline Lofted Surface shares many similarities with B spline Curves 1 Open BLFT5x4 MS2 Fig 19 This hull uses the same five master curves as the C spline Lofted Surface in CLFT5x4 Fig 19 2 and F Right view Zoom to Fit Rotate the model from this view Noticethat the surface does not pass through the middle control curves The B spline Lofted Surface starts and ends at its first and last master curves but unlike the C spline Lofted Surface does not pass through the interior master curves instead it is guided by them or attracted to them in the same way as a B spline Curveis related to its control points 3 m and lt F gt 4 i or lt G gt or View gt Grid to turn on the grid TheGrid displays equally spaced lines superimposed on the graphics display Every tenth lineis a bold line The distance between each Grid lineis reported in the Status Bar at the bottom of the display as Grid
157. l points P11 P12 P13 etc Also the v parameters of magl mag2 and mag3 can be adjusted to control the extent of the rounding If you d liketo seethe use of a SubSurfaceto trim off the portion of hull forward of tangent open Subsurf2 ms2 and see the discussion in Example 2 of the entity description for SubSurface Close the model don t save changes March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 113 Marine Design Examples Round Sterns Round Sterns A B spline Lofted Surface can similarly be patched on at the stern to accomplish a rounding there when desired However because rounded sterns typically involve much larger areas of the surface we would probably opt to makethe whole boat a B spline Lofted Surface 1 Open BLFT5X4 2 or lt gt view 3 Zoom in on the stern master curve MC5 blue mae X E 4 and Show Points Point nametags and Grid To start the stern rounding we ll eyeball MC5 into a curved profile by moving P54 and P53 5 Tools gt Options Dragging Snap and set X Y and Z snaps to 0 1 Next we ll show you how to drag a point when it is too close to another point to be ableto just click on it and drag 6 Click on the bottom of the three visible points on MC5 and select P54 from the Which Entity box When you click on that spot again you will dick on P54 7 Drag P54 forward along the profile to about X 28
158. lar to that axis Dynamic viewing You can also control the graphics view using the mouse The mouse controls are equivalent to rotating panning and zooming the camera using the arrow keys and lt PgUp gt lt PgDn gt We have provided many methods for you to view dynamically You can select a method for controlling the view from the View gt Modify menu and then use the left mouse button to move the model e You can use the left mouse button to select the kind of motion desired from the View Modify toolbar and then use the left mouse button to move the model You can use the right mouse button to click in white space and then pick a mode from the menu and then use the left mouse button to move the model If you have a center mouse button you can useit to rotate or pan directly If you have a center mouse wheel you can useit to rotate pan or zoom directly Rotate The easiest way to rotate is to place the pointer anywhere in the graphics view press and hold down the center wheel or button of your mouse if you have one and move the mouse March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 13 Views and Viewing Controlling the view Alternatively you can select View gt Modify gt Rotate or right click in white space oc and choose Rotate or just click and then press and hold down the left mouse button in the graphics space while moving the mouse The cursor changes to e to indicate Rotation mode P
159. ld entity developable surface Any surface which can be rolled out flat or conversely can be formed from flat sheet material by bending alone without in plane stretching of any element A developable surface has zero Gaussian curvature at all its points Cones and cylinders are well known examples digraph directed graph A diagram that represents the entities in a model the nodes and the dependencies between them directed edges duck Drafting A special weight used for positioning and holding a flexible curve or spline durable relationships Durable relationships in a MultiSurf model arethose which are built into the model through entity dependencies For instance if two surfaces depend on a common edge curve the join between them is a durable join you can change the shape of either of the surfaces but they will continue to join along the shared control curve DXF file An ASCII disk file which serves as a data exchange format between CAD programs The DXF file standard is defined by Autodesk but is used by essentially all CAD programs entity A kind of geometric entity that a CAD system recognizes for example MultiSurf Point B spline Curve or Tangent Boundary Surface or a specific entity made by specifying properties and or parents for a kind of entity entity description A referencetopic in the manual or help system that lists the characteristic properties and or parents required to create a par
160. le plane March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 135 Marine Design Examples A Planar Sheerline x 14 e Home view Point nametags and Turn off Symmetry Images 15 Select sheer 16 9 or Show Hide gt Show Parents This is the quick way to show P1T P21 P31 PAT P51 P61 P71 17 Insert gt Plane Name a0 Type 3 Point Plane 1st Point P11 2nd Point P41 3rd Point P71 Display gt Color red lt OK gt This creates a plane through these three points The right hand rule shows this plane has its positive normal direction downward because of the order in which we took the points 18 77 45 19 Move to Lat 11 Fig 32 Now weare seeing the plane edge on You can see that P21 and P31 lie above the plane and P51 and P61 lie below it Plane a0 EN 3 SEU Fig 32 20 Select P61 then add the plane a0 to the Selection Set you get an unambiguous selection for the plane if you Ctrl24click it beyond the ends of the boat 21 Tools gt Measure gt Clearance 22 Repeat for P51 P31 P21 For an easy method of selecting a point and the Y plane simultaneously turn off Curves filters and drag a box around each of the points in turn The plane will be selected with the point each time We found the following clearances P6l 114 P51 069 P31 050 P21
161. le surfaces in two basic ways 1 as Ruled Surfaces joining two curves which are specially selected to assure developability for example cones and cylinders 2 asexplicitly developable surfaces joining two arbitrary curves One of the ways to check for developability is to look at the Gaussian curvature display Ruled surface 1 Open Ruled1 in the Examples folder This is a single Ruled Surface spanning two curves named sheer and chine Fig 9 left 2 or Z gt view Fig 9 right This shows that the two curves are actually congruent i e parallel and identically shaped therefore this Ruled Surface is a general cylinder and by definition is developable as noted in 1 above chine ruled surface l Fig 9 3 e Home view so you can seethe surface again 4 Select the surface green 5 v or View gt Display gt Surface Curvature Curvature Type Gaussian This opens anew window and presents the color coded Gaussian curvature display The key for the color coding shows at the left side of the drawing area In this case the display is all green indicating Gaussian curvature is zero over the whole surface The white lines on the surface are an artifact of small rounding errors in the calculation of the surface curvature The calculated values for this surface are not always precisely zero falling to one sideor the other of 0 0 The white lines represent those places where the value calculates to precisely 0 0 This is a ne
162. lf siding surface between MCI and its projection on the centerplane 2 Delete the Ruled Surface half siding cyan 3 Select the surface hull 4 Turn on Quick Spline Mode 5 Create a vertical snake near the bow of the boat The spline should have 4 control points Double click to end the spline Don t worry about point locations we will placethem precisely in the next step 6 Changethe positions of the magnets to the following by double clicking each one in turn magneti u 0 v 06 magnet2 u 25 v 03 magnet3 u 75 v 01 magnet4 u 1 v 0 7 Rename theB spline Snake tangent Fig 2 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 112 Marine Design Examples Bow Rounding 8 Preselect profile magenta MC1 cyan tangent magenta 9 gt B spline Lofted Surface or Insert gt Surface gt B spline Lofted Surface Name bowround Degree 3 Control curves pre selected Advanced Divisions 10x2 3x2 Fig 3 lt OK gt profile MCT bowround tangent oo Fig 2 Left Fig 3 Right 10 Hide MC1 cyan so it doesn t confuse the picture 11 Click on bowround and amp Takea look at what you have created Alternatively you can open BOWROUN D MS2 which is this same example This makes a nicely rounded bow which is durable with respect to arbitrary movements of the contro
163. list you want to choose Semi Circle made from the pre selected points Start Center and Guide OK As you can see by your mode and the image the spa will be round on top and we are modeling one half which will be mirrored at a later time March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 150 Procedural Surface Tutorial The Lower Profile The Lower Profile TheLower profile will be brought in as a component l Press lt z gt to change the view 2 With nothing in the Selection Set change to Quick Point mode v With the mouse drop a point to represent one corner of the rectangular bottom of the spa Theimage below is an example 3 With the new point selected go to File Component Load Browseto the MultiSurf Tutorial folder and choose the component Half FilletedLoop mc2 OK OK 4 Fromthe Entity Manager note a Variable has been brought in to the mode with the Component This variable controls the radius of the corner fillets Feel freeto edit the radius value to observe different fillet shapes March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 151 4 Procedural Surface Tutorial Creating the Cross section Construction Entities Properties Name H Layer WM UU Lock False Unit dimensions L Value 4 000 Minimum 0 500 Maximum 10 000 User data Creating the Cross section Construction Entities The following steps can be done from most views Feel free to rotate th
164. ly can use a component in more than one model 1 Open LOBSTER8 MS2 from the MultiSurf Tutorials folder 2 Preselect hull 3 File Component Load PAINT1 MC2 4 lt OK gt to both Resolving Parents and Resolving N ames dialogs 5 Close both COMPONENTBOAT and LOBSTERS do not save changes March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 178 Working with Components Working with Components wrap up Working with Components wrap up In this lesson starting with only 3 master curves you have constructed a complete sailboat model almost entirely from components MultiSurf components provide the ability to paste groups of geometrically related objects into a model without having to construct the component object by object Multisurf provides you with some already made components but it is just as easy to select a portion of an existing model source model and save it as a component to be used in other models host models When importing a component there are several factors to take into account The host model must have the right kind of Parents for the component these must be akin to those in the source model eg if a parent in the source was a surface that parent in the host must be a surface if a parent in the source was a curve that parent in the host must be an entity that can serve as a curve that is a curve snake or point object The orientation must be matched between source and host t fo
165. m looking along the positive X axis radius distance from the center of the sphere the camera s look point to the camera this defines the size of the sphere March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 11 Views and Viewing Controlling the view tilt camera tilt from vertical Fig 2 M odel and its axes camera your viewpoint orbit sphere latitude longitude The camera is at Lat 30 Lon 75 Tilt 0 Thesefour values are displayed on the status line They are updated each time you rotate or zoom Rotate Pressing the up and down arrow keys rotates the model around an imaginary screen horizontal axis that passes through the model s look point In Z axis vertical mode this changes only the latitude in Free tumble mode both the latitude and longitude are free to change Pressing the left and right arrow keys in Z axis vertical mode rotates the model around an imaginary axis that is parallel to the Z axis and passes through the look point This changes only the longitude in Free tumble mode rotates the model around an imaginary axis that is parallel to screen vertical and passes through the look point Both longitude and latitude arefree to change Pan Holding down the Ctrl 7 key while pressing any of the arrow keys pans the camera This has the effect of moving the look point without changing latitude longitude radius or tilt Zoom Pressing PgUp moves the camera inward pr
166. menu Axes and Status Bar should be ON preceded by a checkmark to turn an option on simply click on the menu item or if it has a box next to it dick on the box All Toolbars except Mechanical View Orientation should be ON To check this click on Toolbars A toolbar is on when checked On the Tools gt Options Dragging tab All the snaps should be ON Prompt after drag should be OFF no checkmark Making the side surface Now we re ready to create some objects Remember that you can use our intermediate files as checkpoints and or restart models if you think you ve gotten off thetrack We ll be creating several kinds of points a few simple curves and 6 Ruled Surfaces We ll use a Ruled Surfacefor the side surface of our rowboat This kind of surfaceis made by connecting corresponding points on two curves with a family of straight lines So we ll need to make a sheerline curve the upper edge of the side surface the sheer or gunwale a chine curve the curve where the side pane joins the bottom and then we ll make the side panel between these two curves We ll make the sheerline first creating the three points that define the curve Since we will use Quick Spline mode to makethe points we will create the sheerline simultaneously March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 32 Making a Simple Model Making the side surface Creating the Sheer Curve Quick Spline 1 6 Choose Tools gt Options
167. mmetry Images off with F5 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 38 Making a Simple Model Show and Hide Entities to Simplify the display Show and Hide Entities to Simplify the display The model pictured on the screen is composed of points curves and a surface Someti mes it is simpler to work with only some of the objects displayed MultiSurf les you show and hide objects in any combination you choose The basic process is to create a Selection Set and then hide it We re going to hide the side surface here today gonetomorrow 1 Select the surface side 2 Click 9 or choose Show Hide gt Hide Selection Set lt Ctrl H gt also works All you should see now is 6 points and 2 curves Don t worry the side surfaceis still in the model we have just made it temporarily invisible We could bring it back any time with 9 or Show Hide Show All 3 Youcanalso right click on an entity and select hide from the drop down menu or edit its definition and on the Display tab choose Hidden Making a watertight horizontal bottom The sidelooks nice but now we need to do something about a bottom for the boat We ll make the bottom with another Ruled Surface We want it to be watertight and flat following the curve of the chine By using the chine for the bottom edge of the side and the outer edge of the bottom we ensure a watertight join If we could make a curve in the center of the boat that i
168. mponent we ll begin by selecting the two rudder surfaces 3 Select rudder the side surface and r_bot the bottom surface ah to Select gt Parents gt 1st Generation This adds 3 objects We also need their Parents ES adds 8 points and the centerplane It looks as though we have the whole thing Let s just check to make sure Select gt Parents gt 1st Generation This adds only one support hull but we don t want to include that so click on hull and X to remove it from the Seleciton Set File gt Component gt Save The Component Save dialog says the component will consist of 14 objects and needs one support Type in the ID message rudder then OK Give it the filename COMPONENTRUDDER and put it in the MultiSurf Tutorials folder March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 170 Working with Components Transom Putting the rudder component on the tutorial model As with our cabin now that we ve captured it we can insert the rudder into any model that has the same orientation for its hull surface 1 2 9 Return to COMPONENTBOAT model Preselect the hull File gt Component gt Load gt COMPONENTRUDDER MC2 In the Resolving Parents dialog C spline Lofted Surface hull should be the support lt OK gt There are no name conflicts in the Resolving N ames but type in the prefix r anyway OK Fig 6 Edit Attributes layer 4 Clear the Selection
169. n the graphics space Drag a box around what you want to zoom in on or click and release to center the model on the click point The cursor changes to to indicate Zoom to Area mode Which Rotation constraint to use So which Rotation constraint should you use Its all a matter of preference really Z axis vertical is the viewing method that we originally used in MultiSurf Some of us likeit for boats and any large object because it gives us the feeling of walking around the model For smaller objects some of us like Free tumble mode because it gives us the idea of holding the object in our hands and turning it over any which way In Z axis vertical mode you can pretty easily rotate with the mouse and get back to where you started This is much harder with Free tumble mode On the other hand March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 14 Views and Viewing Orthographic vs perspective views you can put the model in positions in Free tumble mode that cannot be reached in Z axis vertical mode Experiment on your own to get a feel for both modes and to get used to dynamic and step wise motions Motions are easier and faster with the mouse but not as precise as the keys Notice how the view changes and the numbers on the Status Bar change as you practice Since we want to make sure that everybody is always working with the same view weare going to pick a Rotation constraint and usethe arrow keys to move around while doi
170. n the process you ve seen how MultiSurf models are built up from points to curves to surfaces and how you can build in durable relationships by using the right entity and type of dependency You ve also been introduced to pre selection of support objects to filters and to different kinds of views you can have of a model graphics Surface M anager March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 49 Interacting with Models Overview MultiSurf models are changed to achieve design objectives by a set of editing operations In one way or another you can change almost any attribute of any entity in your model We will lead you through a series of transformations of the DEM O model For clarity we will take these transformations one at a time and we will generally go back to the unaltered DEMO model before starting the next change Entity introductions Arc Lofted Surface Frame entity explained Line Point Concept and Function introductions EN RM cursor shapes consecutive points on a line make a straight section in a B spline Curve Adjust Contours locations B spline Curve always starts at first control point Change name in Entity Manager Contours entity must be built from shiftable entity if you want it to shift Contours filter C spline Lofted Surface always attached to first curve Drag select Edit gt Transform gt Shift File gt Export 3D gt 3DA wireframe Quick Bead Show only Boundary lines on a surface
171. nc Marine Tutorials User s Guide e 192 Glossary of Terms Working with Components wrap up March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 193 Index Index Y 0 39 Ctrl 4A gt 79 Ctrl 4F 42 Ctrl 4H gt 39 Ctrl 4L gt 40 Ctrl N gt 31 lt Ctrl O gt 8 Ctrl W gt 41 lt Esc gt 33 lt 1 gt 16 F10 18 F4 47 lt 5 gt 21 lt F7 gt 57 90 F8 18 lt G gt 35 37 90 H ome 13 O31 P gt 15 lt Pg Down gt 12 lt Pg Up gt 12 lt Q gt 46 lt Shift A gt 47 84 lt Shift X gt 16 lt Shift Y gt 16 lt Shift Z gt 16 lt X gt 16 Y 716 lt Z gt 16 3 3 consecutive points on a line make a straight section in a B spline Curve 58 3DA files 21 March 24 2011 A ambiguous selection 40 appendages 120 Arc 76 Arc Lofted Surface 70 arrow keys 12 attitude specifying for hydrostatics 130 Auto Orientation 44 Available Entities pane 9 basic terminology 3 Bead 44 creating one in Quick Point Mode 96 on extension of its curve 99 using to make a B spline loop that joins with continuous slope 97 Bead dragging 80 beads dragging 45 moving beyond ends of basis curve 80 quick beads 96 beginning a new model 31 bottom durably flat across the centerplane 39 bows rounded 112 B spline Curve 86 95 adding control points 97 dosed 97 displaying its polyline 95 G1 join 99 G2 join 99 making a loop that joins with continuous slope 96 relationship to its control
172. nc Marine Tutorials User s Guide e 134 Marine Design Examples A Planar Sheerline The question is what happens in between 6 Down arrow to Lat 10 In this view like seeing the boat heeled 10 degrees away from us the sheerline has an inflection point near midships the curveis concave aft and convex forward This is magnified for us in the curvature profile Fig 29 This isthe powderhorn sheer which most designers wish to avoid C spline Curve sheer Fig 29 7 Close the Curvature Profile Another way to visualize problems in the sheer is to look at foreshortened perspective views from bow or stern First we ll use inverting the Selection Set to get some extraneous lines out of the way 8 Add the following objects to the Selection Set which currently consists only of sheer profile MCA MCD and MCG 9 or Show Hide gt Hide Unselected 10 F5 Symmetry Images n gt view 12 Zoom to Fit Fig 30 Fig 30 Left Fig 31 Right 13 Now use the shift cursor keys to move your viewpoint around and watch the sheerline In some positions you can get hairpin turns tight loops multiple inflection points and other irregularities Lat 5 Lon 175 looks especially squirrely Fig 31 We will make some small adjustments to the sheerline control points removing the powderhorn then repeat these visualizations First how far is the present sheerline from lying in a sing
173. ncept and Function introductions Bow Rounding B spline Curve with straight section C spline Curve with straight section C spline Lofted Deck C spline Lofted Hulls with B spline Master Curves Cylindrical Transom Developable Deck N o camber File gt Export 3D gt RUL surfaces Mix Developable and Compound Curved Surfaces Movable Bulkhead Movable Cabin Planar Sheerline Planar Transom Planing Powerboat Preference for Degree 3 B spline Curve Control Curves Right click in Offsets window white space gt Export OFE Round Stern Sailing Yacht Keds Show Hide gt H ide Unselected gt Show Children Skin Deduction by Offset Surfaces Spars and Rigging Window Tile Horizontal March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 109 Marine Design Examples C spline Lofted Hulls with B spline Master Curves Tools gt H ydrostatics 2M ass Properties Tools gt M easure gt Clearance gt Distance Tools gt Options Performance M odel Divisions multiplier View gt Display gt Offsets View gt Display gt Surface Curvature Gaussian View gt N ametags Surface As you may have gathered from the list of topics this tutorial is quite extensive and we suspect that you ll tacklethe material in chunks rather than at one sitting In fact you may want to usethis tutorial more like a reference choosing first the topics which most interest you The examples are self contained and not based on any particular sequence We do assume that by
174. nd click OK then dick lt OK gt to the non transformable entity box or F gt Zoom to Fit to see the new stretched model The X scaled boat hull Fig 1 middle is 33 3 longer than DEMO but otherwise unchanged In particular the Y and Z coordinates of each point in the model were unaffected just the X coordinates were multiplied by 1 333 Now this does indeed make a 40 ft boat but one that is out of proportion with practice A typical 40 ft sailboat would haveits beam width increased almost in proportion to length to provide more stability and more room inside Also its heights freeboard and depth would normally be increased by a somewhat smaller factor again to gain space inside Let s do this 2 Edit gt Transform gt Scale again This time lt Tab gt to the Transform factor for Y field and typein 1 3 Then Tab to the Transform factor for Z field and typein 1 25 OK and OK to the transformable entity box You don t repeat the 1 333 factor for X scale that s already been done The model updates and shows a hull that is in reasonable proportion for a 40 ft sail boat Fig 1 bottom You can also use a negative scale factor this reverses the model s orientation with respect to the axis involved For example 3 Press or lt Y gt toseea profile view 4 Choose or lt F gt to see the whole boat Fig 2 left March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 53 Interacting with
175. nd notice that rp1 is the last entity in the Selection Set 6 k or Select gt Parents gt 1st Generation One entity the Edge Snake n0 was added to the Selection Set This is the Parent for r0 We d like this component to attach to the deck in our component model so let s keep nO in our selection of entities to include in the component March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 165 Working with Components Cabin 7 ES or Select gt Parents gt 1st Generation again Now C spline Lofted Surface deck has been added We don t want the deck in our component we want the component to attach to another deck so dick on deck in the Selection Set Manager and click to remove it from the Selection Set We have now collected in the Selection Set all the objects we want for our component Time to save it 8 File gt Component gt Save or Alt lt gt 9 The Component Save dialog says the component will consist of 21 objects and needs one parent Type in the ID message cabin lt OK gt 10 Giveitthefilename COMPONENTCABIN MC2 you don t need to typein the MC2 extension and put it in the MultiSurf Tutorials folder Loading the cabin component into the tutorial model Now let s put the cabin on our deck 1 Activate the COMPONENTBOAT wireframe window click in it or use Window componentboat MS2 2 Preselect deck 3 File gt Component gt Load gt COMPONENTCABIN MC2 4 IntheResolving Parents
176. nd planform of keel For example lt F gt Zoom to Fit to see the entire Y 7 view Drag the point bulb nose down to about X 29 Z 15 In this change the bulb stays horizontal because the other end of axis is a Point with bulb nose as its Point parent Where the front of the keel meets the hull you will find a red point called keel ctrl Drag this point and notice how the keel stays durably attatched and constrained to the centerline The point kee ctrl is a ring which in this case is constrained to the edge of the hull surface Close the model don t save changes March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 121 Marine Design Examples Decks Decks C spline Lofted deck Along with our preference for C spline Lofted hulls using B spline Curve control curves goes a preference for the same combination in making simple decks This is an alternative method to the deck you made in Tutorial 3 1 Open HULLDECK This is a C spline Lofted Surface hull similar to DEMO but with 4 control curves 2 Move the viewpoint to Lat 30 to see the deck better deck is a C spline Lofted Surface also with 4 control curves Its first control curve is just the point P11 the other three are B spline Curves magenta with 3 control points each deck durably joins hull because their control curves share the end control points P11 P21 P31 and P41 The
177. ne of the magnets or rings on deck as a support a x 5 Point nametags off and Curve nametags on snakel green is a B spline Snake and snake2 and snake3 magenta areLine Snakes on deck joining the deck magnets and rings Through sharing magnets dm and dm3 these snakes join durably end to end rcl rcz and rc3 also magenta are Relative Curves based on the respective snakes Through sharing endpoints rp2 and rp3 these curves join durably end to end The cabin sides dark green are three Ruled Surfaces joining snakel to rc1 etc Built off snakes on deck the cabin sides join the deck accurately The cabin top dark cyan is a Tangent Boundary Surface which joins its edge curves accurately 6 e Home view amp 7 E and Point nametags on and Curve nametags off Now that you have had a more dose up view of this model briefly take it through the same set of changes as in Tutorial 1 focus on how the dependencies built into the mode allow editing flexibility while keeping the cabin intact and watertight 8 Drag r0 aft along the centerline to just ahead of the red deck beam Fig 18 The entire cabin moves when you move rO because all the supporting points for the cabin are based directly r1 dm1 etc or indirectly rp2 rp4 etc on ro The cabin is durably watertight along the centerline because the ring
178. ng 133 Offset Surface 131 type 1 B spline Curve 86 type 1 C spline Curve 85 Double click entity for Edit dialog 95 double click on entity Edit dialog 33 drag a point 23 drag select 81 drag selection 42 dragging beads 45 durable joins bulkhead example 123 cabin example 124 rowboat example 39 43 durable properties of model 41 49 durably straight stem 58 March 24 2011 DXF files 21 E Edge Snake 43 Edit gt Transform gt Scale 52 Edit gt Transform gt Scale 48 Edit gt Transform gt Shift 55 Edit gt Undo 23 editing adding an entity twice to the selection set 97 adding control points 97 changing which curves support a surface 107 moving bulkhead 123 moving cabin 124 entities can t select 5 entity child 22 entity names with spaces 40 entity orientation for Relative Curve 104 of curves 104 error messages what to do 5 exiting SurfaceWorks 26 49 expand to selected entity in Surface Manager 22 Export 2D File M enu 19 Export 3D File Menu RUL 119 extension of curve 80 F F495 figures in the tutorials 5 File gt Close 23 File gt Exit 26 File gt Export 3D gt 3DA wireframe 66 File gt Open 8 File gt Save 35 File gt Save As 32 files 3DA 21 DXF 21 POV 21 RUL 119 filters AeroHydro Inc Marine Tutorials User s Guide e 196 Index examples of using 41 flying bridge 126 Frame 61 Free tumble mode 11 G G1join B spline Curve and line 99 G2 join B spline Curve and line 99 Gaussian curvature 117 118
179. ng a durably watertight seam For alternative durable transom constructions see Tutorial 6 topics Mixing Developable and Compound Curved Surfaces Sidetrip a planar transom and Cylindrical Transom Realign stations Naval architects commonly align their transverse sections with the endings of the waterline The most common practiceis to have uniformly spaced stations which dividethe waterline length into 10 parts DEM O TR3 hasthis alignment quite accurately but the changes made in both bow and stern in getting to DEMO2 have disturbed the alignment somewhat Let s restore it Since we re going to refer to some specific numbers and since your DEM O2 won t bethe same as ours or as your neighbor s let s usethe same version of the model 1 File gt Close DEMO2 2 File gt Open DEMOTR3D from the MARINE TUTORIALS directory First let s concentrate on the bow ce m 3 or Y to get the full profile view 4 G toturn on the grid 5 e and drag a box around the bow to zoom it in 6 Select MC1 7 Q Zoom to Selection This hull was built with its waterline on the x axis We put a purple contour on the waterline called oddly waterline We want to find the x value where it meets the bow Atthis magnification the Grid should have minor divisions of 1 0 units You can tell this by looking at the status bar which should read Grid 1 Since units for the DEMO hull arein feet you can seethat theforward waterline ending is somewh
180. ng these tutorials When you arefinished experimenting Go to Tools Options General Rotation Constraint and click theZ axis vertical radio button Then press Zoom to Fit so that the model fills the screen and is centered Orthographic vs perspective views The views we have been seeing are orthographic in which the points are projected along parallel lines Thisis the view that engineers are accustomed to looking at usually parallel to one of the 3 coordinate axes Perspective view provides realistic 3D views very similar to those you would see with your eye or with a real camera In perspective points in 3D are projected along lines which converge at the camera or eye point and objects which arefarther away appear smaller than those that are doser To switch to Perspective view Click D or press P or choose View gt Display gt Perspective to toggle perspective on To switch back to Orthographic view click D or press P gt or choose View gt Display gt Perspective Use the arrow keys and lt PgUp gt to move to Latitude 10 Longitude 20 Radius 32 You can press the arrow keys PgU p gt etc in rapid succession to get to a specific viewpoint you do not haveto let the program redraw the image in between key presses Toggle this viewpoint back and forth between Orthographic and Perspective usethe toolbar button and noticethe relative size of the near and far ends of the boat in the two views The Perspective vie
181. nly 1 x 1 divisions in the v direction but we can change that 1 Click side to edit in the Property Manager Set u Divisions 32x1 v Divisions 4x1 OK With the surface still selected look for its orientation marks 1 adrdearound the corner where both u and v are zero 2 a u aongtheedgethat makes the u direction i e wherev 0 3 a v along the edge that makes the v direction i e whereu 0 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 45 Making a Simple Model Adding thwarts 4 arrowheads along the u and v edges showing the direction of increasing u v 5 an arrow emanating from the center of the surface and pointing in the direction of the positive normal to the surface These orienting tools show you that the mesh of lines is much like a 2D coordinate grid painted on the surface We ll use this information when we create the next object a magnet which is a point constrained to lie on a surface The side surface side is already selected so we re ready to go 2 Choose AL or lt Q gt or Insert gt Quick Point Mode The entity created by Quick Point Mode depends on the entity in the Selection Set when it is turned on If the Selection Set is empty a Point is made if there is a curve in the Selection Set a Bead is made if there is a snake in the Selection Set a Ring is made and if thereis a surface in the Selection Set a M agnet is made Because a surface was selected magnets will be created here 3
182. now you will have some facility with the program e g setting filters for points or curves only for preselecting parents during the Create process etc The format of the discussion is basically the same as in Tutorial 4 we have you load sample model files note certain features make some changes often times note the effects etc Do NOT save any of these models under their original names after making changes in them This is so you will havethe original model to go back to in case you or someone else wants to repeat one of the examples MultiSurf Tutorials Introduction contains information about taking a break what to do if your screen doesn t match our instructions basic terminology typeface and symbol conventions and troubleshooting So to begin Start MultiSurf from the Windows Start menu or from Explorer Program Manager or File Manager program filename is WIN DSURF EXE Most of the files for these examples are in they MARINE TUTORIALS folder we ll specifically tell you when a file resides in a different folder When you finish each example and close the file do NOT save changes C spline Lofted Hulls with B spline Master Curves A central task of marine design is the geometric definition of hull surfaces If you have followed the tutorials you have already seen hull examples DEMO CLFT5X4 BLFT5X4 You may have detected our preference for C spline Lofted Surface hulls with B spline Curve master curves C spline L
183. nt on this deck the Edge Snake runs as specified along the u 1 edge of the deck surface but unfortunately in this mode this is the aft edge of the deck so this cabin component doesn t work or Edit Undo to get rid of this cabin component Cabin from CRUISE5 MS2 We need a different cabin one that will work the way we want We know what to check for now Saving the new cabin component 1 Open CRUISE5 MS2 from the MultiSurf Tutorials folder The cabin on this cruiser is constructed similarly to the one in 2CA BINS all of the cabin depends on a single Ring and the Ring lies on an Edge Snake that runs along the center of the deck But let s look at the orientation of deck surface to which it attaches Select the deck u runs from bow to stern and v is at the bow and the Edge Snake runs along the v 1 edge which is what we need Good Let s make a component Select Ring crO white Click Ek the Select Children icon numerous times until it is clear that no items are being added to the Selection Set This is the same as Select gt Children gt All Generations that we used before Now we need to check the Parents 5 h twice or Select gt Parents gt 1st Generation twice The second selection adds the Arc Lofted Surface ddeck which we don t want so remove the deck surface from the Selection Set We have all we need for a cabin 6 7 8 File gt Component gt Save The Component Save dialog says the com
184. o Inc Marine Tutorials User s Guide 86 Introducing More MultiSurf Entities B spline Curves In this case Divisions are 32x1 and there are 5 control points Since 32 is a multiple of 4were ok The Degree 2 B spline Curve red is made up of parabolic arcs that join with continuous slope The Degree 3 B spline Curve magenta is made up of parametric cubic arcs that join with continuous slope and curvature The higher the type the smoother the curve but the less closely it follows the Polyline 2 Lookatthe Left and the Front views to confirm an important property of B spline Curves if the control points all liein a plane so doesthe curve 3 Return to the Home view same as the Bottom view Fig 13 4 Set XY Z snap to 1 0 Tools gt Options Dragging Snap x 5 gt View gt Nametags Point 6 Move p3 up to 16 0 12 This gets it on the same line as p2 p4 and p5 Here we see another useful property of B splines if Degree 1 control points lie on a line a portion of the curveis absolutely straight Fig 14 Fig 13 Fig 14 7 Lookat ES or View gt Display gt Curvature Profile of type2 and type3 Close the curvature display when done March 24 2011 8 Move p2 left to 0 0 12 Notice that the tangent to all three types becomes vertical at the end control point p1 A B spline is always tangent to its Polyline at both end points Fig 15
185. o independent surfaces tangent to one another For this tutorial and the rest of thetutorials it is assumed that you already know something about using MultiSurf and that you are familiar with the basics of inserting entities modifying the display of the model ec If you do not understand how to perform a task you should probably look at the earlier tutorials B spline Curves The Endpoint Tangency Property We ll begin by demonstrating one of the tangency properties of B spline Curves at each endpoint they are tangent to the line between the end and next to end control points 1 File gt Open TANGENT1 ms2 fromw Tutorial Files Check program settings Let s check those program settings and make sure we re all starting with the same ones the initial program defaults This is what you should have On the View menu Axes and Status Bar should be ON preceded by a checkmark to turn an option on simply click on the menu item or if it has a box next to it click on the box All Toolbars except Marine View Orientation should be ON To check this dick on Toolbars A toolbar is on when checked On the Tools gt Options General tab Rotation Constraint should be set to Free tumble On the Tools gt Options Dragging tab All the snaps should be ON Prompt after drag should be OFF no checkmark The B spline Curve So far this model consists solely of seven points We will usethem as control points for a B spline Curve x 1
186. ofile lee eH tice teniente tede e Pee eee i ede 151 Creating the Cross section Construction Entities essen 152 Side Trip Orientation eesssssssseeseesesnesne nennen nennen ener snnt t nennen en 152 Back tothe Cross Sedi Omk oea intet Ae these titt te ertet Aiden et a 153 Creating the Cross Section almost eese eene enne nnn nennen nnn nnn nnns 154 Creating the Cross Section ccceccsscceceseesseeeeeecseeecaseensensecaseenseeseeaeeaaeessassesaseasesesaseaneenseseaneeneees 154 FINISHING lp leer ecce e biberet 156 Working with Components 159 INTFOCUCH OF LTEM 159 The beginning Mod E s iinei iaire nerie aeiaaeeao ia ih aiara aiek are aeaaeai 160 MultiSurf for SolidWorks Users essent nennen 160 In MultiSUEt aas c eo tct tete tnde PP p nx e e ere t 160 Check programvsettirigs Sed ied t eT e e tit edd ee 160 ACTON memory alds 3 iode tete amt or tei qa eq a tea End roe a Ded de ele 161 Hull skin and contours esssssssssssseseeee teen tne trennen rennen enne nes 162 bod EE 163 Cabin ain eatem nane omae 165 Cabin from 2CA BIN S M S2 nennen teen tnt tenerent nennen 165 Saving the cabin component ssssssssssseeeeenee nennen trente trente nnne 165 Loading the cabin component into the tutorial model sss 166 Cabin from RUISES M S2 aae cinere e er Ene te ex e ite ea ie leeren
187. ofted Surfaces are composed of C spline Curves sprung lofted through a set of master curves They are natural candidates for hull design because their longitudinal C splines e behave similarly to a drafting spline e behave similarly to planking and ribbands e arelikely to automatically fair themselves if you use a modest number of control points e pass through all their control points which gives you more direct shape control e arenaturally parameterized in proportion to arc length 1 Open DEMO MS2 This is a C spline Lofted Surface with just three master curves each a B spline Curve with 4 control points This really seems to make a nice hull and there are many possible variations on this shape just working with the 12 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 110 Marine Design Examples C spline Lofted Hulls with B spline Master Curves control points The fewer master curves you use the more automatic is the longitudinal fairing 2 Close DEMO 3 Open CLFT5X4 To obtain more control over the longitudinal distribution of displacement it is natural to add more master curves This is the same basic hull as DEMO but with 5 master curves 4 9 Show Hide gt Show Points Fig 1 x 5 gt Point nametags Fig 1 6 e or lt X gt view and lt F gt to Zoom to Fit 7 Move P22 P23 P42 and P43 around moving these four points you can make many variations
188. oint 4 Choose Z 0asthe mirror planefrom the Entity Manager Els System bs O j T zk n iit X Lit w 0 bo ek 7 0 S UNIFORM j m sx 00 sm Un ak l0 Ls sk n 3 EMPTY Set WEIGHTS With the 2 beads and the projected point we have 3 corners of a rectangle The best way to complete the rectangleis with a Copy Point NEW In creating a Copy Point you select a point you want to copy a location where you will copy it from A Frame A point can act as aframe anda frame you will copy it to A mite confusing but this should clear up after the next step 7 The Copy Bead is the point we want to copy Select the Copy Bead 8 Ctrl Select the Projected Point Framel and the Top Profile Bead Frame2 9 Insert Point Copy Point Name CPT Color Yellow 10 Insert 2Lines One between the bottom two points and one between thetop two points 1l Select the2 Lines and create a Ruled Surface between them March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 153 Procedural Surface Tutorial Name ST Divisions 2X1 2X1 Drag the Bead on the Top Profile to see our construction entities move as one Creating the Cross section almost Let s dear up the view to avoid confusion and ambiguous selections Select the construction surface S1 Show Hide Hide Unselected or click the toolbar icon Creating the Cross section l Select SI 2 Insert Snake Edge Snake March 24 2011
189. oints P11 and P13 OK Fig 6 The model updates and your new line appears eee 7 Fig 6 Create a bead on Line guide March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 58 Interacting with Models Reshape the stem 2 With theline guide still in the Selection Set k or lt Q gt or Insert gt Quick Point Mode to turn on Quick Point Mode Thecursor changes to P Since we have a curve selected a Quick Bead will be made 3 Place the cursor close to point P12 and click to create the bead The model Fig 7 with the green bead sitting on top of P12 or nearly so E le n LLL MERE Fig 7 Adopt Children 1 Click in white space to clear the Selection Set 2 Now placethe cursor in white space near P12 and bead1 Click and hold the left mouse button while dragging a box around thetwo points When you release the mouse button you will have placed both points into the Selection Set 3 Tools gt Adopt Children or Shift A Make sure P12 is listed first If it is not press the Reverse Order button Then check the Delete old parent P12 box and press lt OK gt Now MCT is truly and durably straight from the tip of the stem to half way between bead1 and P13 Fig 8 This should match our distribution model DEM OTR3A M S2 meet
190. ojected Curve or for specifying the infinite family of potential cutting surfaces for an Intersection Snake MS file An ASCII disk file which defines a model created in MultiSurf normal normal to Perpendicular to For example a normal plane perpendicular to a curve the normal direction perpendicular to a surface NURBS NURBS is an acronym for Non Uniform Rational B Spline This is a formulation for parametric curves and surfaces which permits a uniform representation of B spline Bezier and conic section curves and surfaces offset A displacement perpendicular to a surface offsets Nav Arch A conventional way of presenting a hull shape numerically by giving transverse and vertical coordinates at a series of stations orbit sphere When you rotatethe camera it works as though it were mounted on the surface of a sphere pointing inward toward the center which is the look point This imaginary sphereis called the orbit sphere of the camera orientation of curve or surface The direction in which the parameters t Curve snake or u v surface increase Entities such as Trimmed Surfaces require the orientation of one or more basis curves snakes to be in a specific direction View gt Entity Orientation displays this information for the selected entity orthographic view An orthographic view maps a 3D scene into a 2D screen image using parallel projection lines This is an artificial view which is conventional for
191. onale behind the locations of dx dy and dz the overall length of our rowboat is 12 ft which shows up as the dx value of s3 stern the dx value at s2 midships is 6 and zero at s3 bow The maximum beam is a little over 4 ft 2 times dy of s2 just aft of s2 the 3 ft transom breadth is 2 times dy of s3 dz shows the values set for freeboard 1 5 ft at the bow 1 0ft midships and 1 2 ft at the stern Z s3 Y Fig 3 Rowboat modd first 3 points Lat 10 Lon 60 x 11 Click or choose View gt Nametags and click the Point checkbox then click lt OK gt The point nametags appear diagonally down right from their respective points March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 34 Making a Simple Model Making the side surface 12 Click on the curve and change the name to sheer Click lt OK gt to accept the Edit dialog 13 Click fa or File gt Save This should match our distribution model T2ROW1 MS2 7 14 Press lt F5 gt to turn Symmetry Images on and take a look at the or lt X gt and ce or Z views as well 15 Click i or press lt G gt or choose View gt Grid A ten unit by ten unit grid subdivided into units is displayed along with the model The status bar reports the size of the smallest grid divisions in this case 1 Grids are visible only in orthographic views that are parallel to one of the coordinate axes The Z view is parallel to both X and Y ax
192. ons or Select gt Children gt All Generations but we often find that it is easier especially in small models to just quickly dick on E or ER until all generations are selected Multiple graphics views of a model In MultiSurf you can have several graphics views of a model open at the sametime These views are all linked changes you maketo the model in one window are reflected in all the others Let s see 1 8 Window gt New Model Window This opens a second model of the demo hull displaying it in the Home view This new window is now the active window Switch this view to the Y view Window New Model Window Switch this view to the Z view Window gt New Model Window Set this view to the X view Click Dn WindowsTile Vertical If you find that the 3 non graphic panes take up a lot of space you can resize them by grabbing the right side of the panes with the mouse and sliding it left Click Zoom to Fit to make the image fill the X view window Click in graphics white space of the original window window 1 to activate that window Click to fill the window Repeat steps 6 and 7 for the other two windows Let s do a simple edit to show you what we mean when we say the views in the windows are linked At this point we won t explain any whys about the editing process we ll spend plenty of time on creating and editing objects in the succeeding tutorials 9 10 11 12 x Click in graph
193. op of thelist highlight the first instance of bead1 then dick to move it into second position in thelist 6 IntheEditdialog click OK March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 98 Building Tangency with B splines Tangency Between a B spline Curve and a Line Fig 6 The curve has developed an S curve Fig 6 but we re not quite done with it yet We need to put the bead into position 7 Select bead1 and drag it off the end of the line to the right Fig 7 Now you can see that the end ptT and next to end bead1 control points of the B spline Curve are in line with the Line thus making the B spline Curve tangent to the Line This join is G1 there is continuous slope at the join To make the join G2 continuous slope AN D curvature you could add another bead on the line and include it in sequence as another control point for the B spline Curve Depending on how far off theline you dragged the bead your model should now resemble the distribution model TAN CURVELIN E ms2 o V o P Fig 7 8 Drag bead1 back and forth along the extension of the line N otice that the farther right you drag the bead the smoother the transition between the line and the B spline 9 Aswith the previous example you can movethe endpoints of theline and the tangency between the line and the B spline will be maintained eg Fig 8 Try it Fig 8 March 24 2011
194. or Signed distance from M irror Surface to 0 index contour enter the value we found above 1 619 For Contour spacing enter X10 X0 10 2 29 337 1 619 10 22 772 Now your stations should be nicely aligned This should match our distribution mode DEM OTR3E M S2 27 77 or to seethe profile view again We ll zoom in and look more dosely at the alignment 28 Q and drag a window to zoom in on the forward end of the water line Fig 13 where Sta O now intersects it exactly well almost exactly we did round off the values to 001 if you zoom in far enough you ll be able to see the slight discrepancy but 001 would be plenty accurate for designing and building this hull Fig 13 File gt Save As DEMO2 not as DEM OTR3D Y es to replace an existing DEM O2 Add a cove stripe Just for fun let s add a decorative line cove stripe on the hull surface of DEMO2 A snake will be a good tool for that Snakes are not only useful for creating watertight joins between surfaces but may be used for decorative purposes as well First we ll need two magnets for control points 1 Select surface hull 2 Zoom to Fit 3 a to turn on Quick Point Mode 4 Place a Quick Magnet near the bow and another near the stern March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 67 Interacting with Models Add a deck surface 5 With both of these M agnets in the Selection Set Va
195. or for making N C files 11 Hide inside and Show hull 12 View gt Display gt Ship Lines lt OK gt to accept defaults The body plan here can be captured as a 2D file Plotted full size it would make the patterns required for mold frames We have been speaking as if the deduction is always positive However some boats areformed using female mold frames wherethe deduction is negative i e the mold frame is outside the hull and is oversize by a constant amount normal to the hull This is easily accomplished using an Offset Surface that is outside the hull surface in this case a negative value for the Single Offset March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 133 Marine Design Examples Occasionally a boat uses different thicknesses of core material in different parts of the hull This can be handled by the following steps assuming for this example that there are two core thicknesses 1 Createa snake core step on hull along the line dividing the two thicknesses 2 Maketwo SubSurfaces lower from the portion of hull below core step and upper from the portion above core step 3 Make two Offset Surfaces one from lower and one from upper each with the required offset 4 Set surfaces to cut for the Contours to just the two Offset Surfaces and cut sections as before Close the model don t save changes A Planar Sheerline March 24 2011 It
196. perpendicular to the centerplane the line between p14 and pp14 is perpendicular to the centerplane any plane that includes that line will also be perpendicular to the centerplane 2 Then weplaced three Points points p24 p34 p44 close to this plane and made three Projected Points pp24 pp34 pp44 which are the projections of these Points onto tr_plane Two of the Projected Points are used as the aft endpoints for chinel and chine2 and all three control points are used for mc4 the Projected Points lie accurately on the plane The three Points p24 p34 and p44 then just serve as handles to drag the three Projected Points around with If wehad wanted a cylindrical transom we could have created a cylindrical surface e g with a Translation Surface or a Revolution Surface in place of the plane tr plane and used three magnets on the cylinder as end points and control points for chinel etc For cylindrical transom examples see Tutorial 3 Reshape the stern and Tutorial 6 Cylindrical Transom on page 139 Close the model don t save changes Sailing Yacht Keels Accurate attachment of a keel to a hull is an important issue We achieve this in durable fashion by using a snake on the hull for the upper edge of the keel surface If thereis a bulb we would design the hull and bulb as separate independent surfaces then build the k
197. plan view from above with positive Y downward and positive X to the left Fig 6 Fig 6 Following any of the letter keys you can rotate again with the arrow keys You will remain in orthographic view unless you click D or press P gt or choose View Display Perspective Help side trip The key functions controlling the view arefairly numerous Though most of them are mnemonic it may be hard to remember them all But panic not We ve provided a key actions summary card with this manual and a detailed on line help system within the program To access the on line help system all you need to do is press the F1 funcion key or choose Help gt Help Topics Let s takea little side trip to check it out 1 Choose Help gt About MultiSurf This is where you find the version and build number of your MultiSurf program 2 Click lt OK gt to close this help window March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 16 Views and Viewing Four ways to zoom Now choose Help gt Help Topics This is the on line help file At the top of the Contents listing on the right side click on All Keyboard Shortcuts Listed Alphabetically by Option This shows you the table of shortcuts listed alphabetically by option Use the scroll bar or the mouse wheel to scroll down through the table You can change the size of the help window by dragging its bottom corner Notice that the Contents listing on t
198. pline s tickmarks are concentrated in its area of high curvature the right side in this view Thisistrue of all B and C spline curves If we were to make a surface between these two curves we would see that the u constant lines would mostly be skewed That is becausethe u constant lines run along equal values of t between the two curves and these values do not line up properly This causes the resultant surface to have curvature where you don t want it Fortunately we have afix for this 7 Turn off tickmarks on both curves 8 Select the PolyCurve and the B Spline if they are not still selected from the previous step in either order 9 7 gt Ruled Surface or Insert gt Surface gt Ruled Surface OK to accept defaults This should approximately match our distribution model POLY CURVE3 ms2 A ruled surface is made with only the u constant rulings showing As we hinted above they are not for the most part vertical in this model If you press the right arrow key a number of times and watch along the right edge of the surface you will begin to see curvature in the surface where it should be straight To get to 15 degrees longitude go to 20 and then Shift right arrow 5 times to get to 15 Fig 10 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 83 Introducing More MultiSurf Entities SubCurves Ruled Surface PolyCurve Lat 90 B spline EBEN Fig 10 SubCurve fix 1 Select th
199. points 95 relationship to its polyline 96 tangent to a line 98 using Mirrored Points to make tangent joins 101 with straight portion 87 116 B spline Curve always starts at first control point 57 B spline Curve AeroHydro Inc Marine Tutorials User s Guide e 194 Index Degreel how to make meet points 86 B spline Lofted Surface 90 changing which curves support the surface 107 creating 105 making 2 B spline Lofted Surfaces tangent to each other 103 B spline Snake 88 bulkheads movable 123 C cabins component with correct orientation 167 component with wrong orientation 165 durable joins 124 movable 124 with flying bridge 126 camera definition 11 moving 12 center of gravity hydrostatics Z coordinate of 130 Change name in Surface M anager 70 child entities 22 Clear Selection Set 40 components cabin with correct orientation 167 cabin with wrong orientation 165 deck arc lofted 163 hull skin C lofted 162 issues 159 keel using component scaling factors 168 orientation 166 167 paint job on 2 different hulls 177 prefix 166 resolving names 166 168 rigging saving loading editing 175 rub rail saving loading editing 172 March 24 2011 rudder saving and loading 170 saving 165 170 172 scale factors 176 selecting objects for 165 170 172 transom Supports wrong and right order 171 tutorial 159 using 159 162 compound curved surfaces 119 Contours entity must be made from shif
200. ponent consists of 21 objects and needs one support Type in the ID message cabin lt OK gt Give it the filename COMPONENTCABIN2 MC2 you don t need to typein the MC2 extension and put it in the MultiSurf Tutorials folder March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 167 Working with Components Keel Loading the new cabin into the tutorial model Keel Now that we ve captured this cabin we can insert it into any model that has the same orientation for its deck surface Let s put it into our tutorial model 1 Back in COMPONENTBOAT pre select the deck 2 File gt Component gt Load gt COMPONENTCABIN2 MC2 3 Inthe Resolving Parents dialog Arc Lofted Surface deck should be the support OK 4 Inthe Resolving Names dialog no name conflicts are indicated so click lt OK gt after we add the name Cabin Why no name conflicts here when there were name conflicts with our other cabin component The cabin objects in CRUISE5 M S2 have different names than those in 2CA BIN S M S2 In fact all the CRUISE5 cabin objects have names that begin with c for cabin you can turn on nametags to see 5 Inthe Property Manager change layer to 2 6 Clear the Selection Set This cabin has all the same dependency relationships it had in CRUISE5 and they are the same as those in 2CABIN S what s different is the deck s orientation To illustrate let s move the cabin forward a foot or so before we go ahead 7 D
201. ptT to pt5 that s theorder we want them in for the curve we re creating so we can proceed without having to reorder them in the Selection Set 4 n gt B spline Curve and OK to accept the defaults 5 Select pt1 and pt5 and make a line between them see Fig 3 below 6 With the Line still selected click k and place a bead on the line near its middle Return to Select M ode March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 96 Building Tangency with B splines Fig 3 Add the Bead as a Control Point Now we ll add this bead as the first and last control point for the B spline Curve 1 Click curve to edit in the Property Manager Click Control points field to activate salmon so we can proceed to adding control points 2 Inthegraphicimage Cirl click bead1 and then Ctrl shift click bead1 again this adds bead1 twice to the Selection Set of control points for the curve 3 IntheSelection Set pane highlight one of the bead1 entries then use F to move it to the top of the list 4 Click OK Fig 4 This should match our distribution model LOOP2 ms2 in Home View e Fig 4 5 Drag pti or pt5 around eg Fig 5 The loop remains closed and the curvature remains smooth across bead1 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 97 Building Tangency with B splines Tangency Between a B spline Curve and a Line
202. r curves and snakes u v and normal orientation for surfaces N ame conflicts between the component entities and the entities in the host model can be avoided by adding a prefix to the component entity names in the Names Resolution dialog The size of a component can be changed immediately after the loading operation by using Edit gt Transform gt Scale Once in place entities added to a model by loading a component can be edited just like any other MultiSurf entities Now it s your turn You may be surprised by all the components you have lurking in your MultiSurf models just waiting to be captured and used in new places Happy componenting March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 179 Glossary of Terms ambiguous selection When you click on a screen location to select an entity and there aretwo or more entities within the cursor s target box that pass through the current filters the selection is termed ambiguous The Which Entity dialog opens listing the eligible entities at that location so you can indicate which one you want to select attribute An entity attributeis any of the data items used to definethe entity e g name color visibility divisions type relabd orientation supporting object s etc axial orthographic view An orthographic view in which you are viewing along one of the world coordinate axes The shortcuts for these views are Front Back Left Right Top Bottom M e
203. rag ring Cabin crO forward to t 0 34 Fig 5 This should match our distribution model COM PBT2 M S2 Fig 5 8 Close 2CABINS and CRUISES do not save changes if any Now let s add a keel We ll use one that is an already made component distributed with MultiSurf It attaches directly to the hull Onething you need to know about this keel it comes off a boat whose canoe body is less deep than that of our Component boat To compensate we can shorten the keel after we load it we ll scale it by afactor of 0 9 in Z Maybe before slapping another component onto the boat you would liketo take a look first to make sure we are suggesting the right thing You can open a component file just like other files 1 lay or File gt Open March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 168 Working with Components Keel 2 IntheOpen dialog box change Files of type to All Files which enables you to open component files with the extension M C2 3 Pick KEEL1 MC2 which we are going to use next also in X MultiSurf Tutorials folder 4 lt OK gt to the warning message Rotating the model will show you that this looks something like a keel We started our model with three master curves but you can actually start building a model from a component file adding other objects or other components to it although a keel might not be the place to start To do this you would File2Save As to save the component plus
204. rch An orthographic view perpendicular to the hull centerplane displaying the profile and buttock lines property of an entity An entity property is any of the non parent data items used to define the entity e g name color visibility divisions type degree etc Relabel entity A Relabel entity controls the relabeling re parameterization of a curve snake or some surfaces It is not a visible entity in itself but its effects on labeling can be made visible by showing tickmarks for the affected curve or snake Its effect on surfaces is harder to see but magnets will change their absolute location on a surface as the surface s u v parameterization changes Relational Geometry Also referred to as RG The conceptual framework of MultiSurf a scheme for defining geometric entities and the relationships between them Capturing relationships as part of a geometric model allows automatic propagation of changes to all affected entities and supports the key advantages of Relational Geometry accuracy design flexibility parametric design ability to freely refine and optimize resident If entity A is embedded in entity B another entity of the same or higher dimensionality then entity A is a resident of entity B A bead resides on a curve a magnet resides on a surface a ring resides on both a snake and a surface Converse of host ring A point constrained to lie on a snake A ring also lies on the surface the snakeis on so it
205. rmable objects in the model radio button X shift 15 475 note the minus Z shift 6 this Z shift will put the Z 0 baseline at the bottom of an as of yet undesigned keel lt OK gt lt OK gt Fig 3 bottom Fig 3 DEM O M S2 initial modd top and shifted model bottom 6 backtothe original DEM O model again 7 e to seethe original view of the model Reshape the stem The next examples involve more steps so we have provided intermediate model files for you just in case If you get confused and don t want to go all the way back to the beginning of a sequence of edits load an intermediate file noting where it fits in the text E g This should match our distribution model DEM OTR3A M S2 Many model transformations and edits involve moving individual point entities Recall that you can do this either by dragging the point on the screen and or by typing in new coordinates or offsets in the Edit Entity dialog March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 55 Interacting with Models Reshape the stem For these examples we ll use a modification of the DEM O model onethat has a cylindrical transom surface rather than no transom surface 1 File gt Open gt DEMO TR3 MS2 Let s start this editing by focusing on the bow 2 Maximize the graphics window 3 Movetothe or lt gt view 4 8 to display the grid 5 Zoominonthebow Click a and drag a box with corners at about X 5 Z 5
206. rol curves 6 With MC3 still selected add MC1 and MC2 to the Selection Set Ctrl 24clicks 7 File gt Export 3D gt 3DA wireframe In the options dialog choose to export the Selection Set Only lt OK gt Give the filename DEMOMCS Y es to replace existing file And now we ll read them back in for comparison 8 Insert gt WireFrame Name oldmcs Frame Point Filename demomcs Display gt Color uncheck Use 3DA colors and make Color blue lt OK gt 9 Edit MC3 Degree 3 lt OK gt In order to make it easier to see what is happening 10 Add MC1 MC2 and the wireframe oldmcs to the Selection Set 11 Show Hide gt Hide Unselected Fig 42 Now you can see the shapes of both the wireframe copy of the original Degree 2 master curve blue and the new Degree 3 MC3 cyan MC3 is much less tightly curved because of the relative stiffness of a Degree 3 spline We will reshape MC3 to approximately its old shape by moving P32 and P33 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 144 Marine Design Examples Preference for Degree 3 B spline Curve Control Curves x x 12 9 and m Show Points Point nametags and Orthogonal Dragging on 13 Drag P32 down about 0 6 ft to about Z 0 72 14 Now drag P33 outboard about 0 65 ft to about Y z 3 15 Fig 42 Left and 43 Right This produces a Degree 3 curve
207. rse sections through the hull and deck surfaces as cyan polylines This view of the model consists of just the data that you see here a series of transverse X constant sections each represented as a polyline Y mirror symmetry is assumed March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 128 Marine Design Examples Offsets and Hydrostatics OO Asthe program detected and warned us about and you probably have noticed as well there are some deficiencies in this particular representation of the DEM O model First the whole bow is missing Less obviously a piece of thestern is missing the last section is at X 2925 while the hull extends to X 30 Use of just 11 sections stations 0 through 10 looks a little skimpy 5 Leaving the Offsets view open return to the graphics window Creating more cross sections First well doublethe number of cross sections 1 Edit the definition of stations red Index of first contour 1 Index of last contour 20 Signed distance from Mirror Surface to 0 index contour 1 8 unchanged Contour spacing 1 368 lt OK gt Notice that the Offsets Warning box now only shows that the last station has a problen we ll fix that in a bit E 2 or WindowsTile Horizontal to seethe results thus far Fig 25 Fig 25 The number and location of offset stations is controlled by visible Contours entities which liein atransverse plane Next we will create
208. rsor over the cyan curve that forms the bow forward edge of the hull and click the mouse You can tell when you are over the line when the cursor changes to This selects the curve B spline Curve MC1 Selected entities are drawn in bold 3 Right Click in white space in the Entity Manager the top pane From the drop down menu choose Expand to Selected Entities You should see the curve MC1 highlighted among the other curves in the model This isa convenient method of finding an entity in the Entity Manager 4 Right click on the curve in the Entity Manager and choose Parent Child from the drop down menu You can also get to the Parent Child box directly from step two by right clicking the entity in the graphic space and choosing Parent Child MultiSurf opens a new window showing the parents and children of the selected entity The selected entity MCT still has the light blueicon in this window MultiSurf unique modeling power derives from maintaining and utilizing a web of parent child relationships among the entities making up a model When entity B is created by a construction that directly utilizes geometric information about entity A we say that entity B is a child of entity A or conversely that entity A is a parent of entity B Parent Child is a facility for exploring and understanding the complete set of relationships connecting the entities of a model The Parent Child window has two parts a p
209. rt or drag a point roughly where we want it then Edit in the Property Manager look at the coordinates that come up then type in the exact numbers if needed particularly accurate zeroes One other thing you need to know about dragging points the motion is all in the plane of the screen In this case since we are using the Y gt projection an orthographic view in which the world X and Z axes are parallel to the screen axes the dragging affects only the X and Z coordinates of the point we are moving Creating a Relationship Now we ll edit one of the existing points to create a relationship 1 Click the middle point on the curve we just created to enter edit mode Notice in the Property Manager for the point includes a section labeled Parents Every point in MultiSurf has two parents If the default parents are accepted then the point location dx dy dz is measured from the global origin and measured along the global coordinate system also labeled If a point other than the default point is entered then dx dy and dz is measured from that point 2 Change the name of the point to c2 We want c2 to beat the mid point of chine so lets base its location on the midpoint of sheer s2 To do this change its Point Parent from the default point to s2 3 In the Parents box click in the Point field You should seethe Point field turn salmon color 4 Click the point s2 from the graphics view the Available Entiti
210. s rO and rl cannot be moved off the Edge Snake that runs along the centerline of the deck unless you change the deck so it doesn t end on the centerline Fig 18 9 Now drag rO directly forward to about halfway between the tip of the bow and the cyan deck beam 10 Drag r1 aft along the centerlineto the red deck beam Fig 19 The aft end of the cabin moves when you move r1 becausethe supporting points for the aft surface are based directly dm3 and rp4 or indirectly rp3 on Fig 19 rr March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 125 Marine Design Examples Superstructures 11 Select rO again at the front of the cabin 12 Drag rO aft to the cyan deck beam The whole cabin moves again Pretty slick Okay let s leave 2CABINS and move on 13 Close the model don t save changes A cabin with a flying bridge 1 Next open PWRB1 Thisis a more complex superstructure model and we ll just point out some of its features You ve already seen this hull and the Ruled Surface deck 2 o Show All Now you can see the next element in our design the cylindrical Translation Surface top surf blue used as a basis for the upper deck and the construction line baseline After top surf we added B spline Snakes deck snake red on deck and ts2 cyan on top surf to serve as edge curves for the Ruled Surface windows cyan Fig 20 top You can h
211. s are off EE and oe to turn on a ee Orthogonal Dragging 12 Drag gm3 straight forward until the forward edge b of the rail is vertical This fixes the tilt of the edge Fig 8b Now let s slim down therail put it on a diet We ll need to move gm3 and gp2 SS 13 Drag gm3 again this time straight downwards about 1 3 the distance to gm1 or about du 0 025 Fig 8c ge d pee 14 Next change gp2 s offset to 0 26 Fig 8d 15 Now when you rotate the hull you see a beautiful Fig 8 rail 11 File gt Save COMPONENTBOAT MS2 This should match our distribution model COM PBT5 M S2 12 to see the whole boat Better and better all the time 13 Turn off all nametags March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 174 Working with Components Rigging Looks like that did the trick As you can see even though when we made the GUARD1 model to demonstrate the SweepSurf entity we didn t plan to make a component out of it we were still able to do so Yes we did have to edit it somein order to make it work on our new hull but that s not bad If we had been thinking component when we madethe original model we might have used an alternate construction that would have had a single control point for adjusting the rub rail width on a new host hull 14 Close GUARD1 do not save changes if any Rigging Well if we re going to sail
212. s is said to interpolate the points for example C spline Curve Likewise a surface that passes through a set of curves or points is said to interpolate them for example C spline Lofted Surface keel Nav Arch An appendage on a sailboat hull which usually serves both ballasting and hydrodynamic functions Typically it is afin approximately centrally positioned on the bottom of the hull but it can be much more complex and specialized knot Mathematicians generalize the definition of spline function to mean any piecewise polynomial function which satisfies certain conditions of continuity at the knots the points where the pieces join together March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 186 Glossary of Terms Working with Components wrap up latitude One of the viewing angles used to control the camera position angle above or below a horizontal plane lofted surface A lofted surfaceis shaped by two or more control curves in much the same way as a curveis shaped by two or more control points The process which MultiSurf carries out automatically and invisibly is 1 Decide the orientation of the control curves with reference to the first control curve that has positive length 2 On each of the control curves locate points at the same parameter valuet or 1 t if the curve is used with reversed orientation 3 Use the resulting series of points as the control points for a lofting curve lof
213. s off Press F5 to toggle the symmetry images off 3D drawing files Next go to File Export 3D This option saves the complete 3D shape which is independent of the particular view whereas Export 2D saves just the current view of the model as a specific 2D picture The 3D shape can be saved in several formats a DXF file composed either of a wireframe or of meshes for input to AutoCAD or other 3D CAD programs an IGES file of NURBS approximations of the MultiSurf surfaces a VRML file Virtual Reality Modeling Language for transmission of 3D visual models over the Internet a file of POV triangles for input into the POV Ray rendering program e a RUL surfaces file ruled and developable surfaces for flattening in M SDEV an AeroHydro 3DA wireframe file Files that are exported as a 3DA wireframe can be reloaded using Insert Wireframe back into MultiSurf as WireFrame entities for display in combination with other entities if desired Click anywhere in the background of the graphics view to close the menus without saving a file and to makethe graphics view active again View dependency There is another non graphical way of looking at a model that we should demonstrate while we re looking at ways to view a model 1 If you arenot already there return to the Home viewpoint March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 21 Views and Viewing View dependency 2 Now place the point of the cu
214. s or styles for details see Basic Concepts in the User s Guide Therefore the focus of these tutorials is two fold e To introduce you to specific MultiSurf functions and entities e To help you become comfortable working in the surface modeling style Thefirst lesson introduces you to the new user interface and some of itsfeatures In the second lesson we will build a simple model to demonstrate some basic M ultiSurf methods Then we ll move on to acquainting you with the wealth of MultiSurf entities In later lessons we will concentrate on creating and modifying somew hat more complex models To make the most of your tutorial experience we recommend you give yourself plenty of time so you don t feel the need to rush Y ou can of course stop part way through any of them And don t worry about trying to understand every last detail at each step As you work through the guided tour and get more of a feel for MultiSurf you ll find that concepts and techniques will become familiar and clear We recommend that you read Basic Concepts in theUser s Guideor online help before you launch into the tutorials Using the Online Tutorials For those of you who would liketo run the tutorials from online rather than printed instructions you can open the onlinefile in either of two ways e Onthe Windows task bar choose Start gt Programs gt A eroH ydro gt M ultiSurf Tutorials e In Windows Explorer go to the MultiSurf folder and dou
215. s parallel to chine and lay the bottom between the curves it would assure that the bottom is durably flat across the centerplane The solution for our problem is a Projected Curve A Projected Curveis a curve formed by projecting a basis curve onto aM irror Each point of the basis curveis projected normally perpendicularly onto M irror the Projected Curve therefore lies entirely in Mirror M irror can bea plane line or even a point object In this case we will use a plane 1 Select chine by clicking on itin the workspace 2 Click n gt Projected Curve or Insert Curves Projected Curve Notice that the first support Curve is filled in with chine because we had pre selected it The second support Mirror is filled in with EMPTY Thisisthe way MultiSurf lets you know that no entity has been picked ye for this support We want to project chine parallel to the Y axis onto the y 0 plane This plane exists in MultiSurf as one of the default planes Itis called Y 20 and can be picked from the Entity Manager To do this 3 Expand the System Heading in the Entity Manager 4 Thelnsert Dialog opened with the Mirror support box active salmon background If itis not now dick inside the box to makeit active March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 39 Making a Simple Model Making a watertight horizontal bottom 5 Select Y 0 from thelist by clicking on it Y Z0 now appears in the Mirror support box Ch
216. s results from the linear blending GO tangency for the Tangent Boundary Surfaces The bottom starts with a pronounced hollow at the stern which gradually fades away as you come forward Keel with a Durably Straight Portion March 24 2011 With PWRBZ2 still open itis also interesting to note how the straightness of the keel in the aft half of the boat is accomplished keel is a B spline Curve Degree 2 and four of its five control points lie on the line baseline three of them are beads and oneis an end of baseline This makes keel durably straight from the midpoint between beads D2 and D3 to its end You can also make C spline Curves with durably straight portions using the following method Make the control points be a bead at the mid point of the line t 0 5 a bead very close to the end t 20 0001 or t 0 9999 the point at the end of the line t O ort 1 AeroHydro Inc Marine Tutorials User s Guide e 116 Marine Design Examples Developable Surfaces For an example see STRGTPART ms2 This method makes excellent chines and keels for powerboats Close the model don t save changes Developable Surfaces Developable surfaces surfaces that can be made by bending flat material without stretching it are advantageous for metal and plywood boats because of the ease with which they can be formed from the flat sheet material In MultiSurf you can make developab
217. strained to lie is tilting towards us so although we have moved m4 straight left in the plane of the screen watching the du value the dv value may also change a little bit which is okay here 6 Select the dark cyan surface s0 7 ES to add its parents to the Selection Set 8 9 to hide the Selection Set 9 lt F5 gt to turn on Symmetry Images 10 G F and E to turn off the Grid Zoom to Fit and turn off Point Nametags again Looks good Let s check the other standard views to be sure 11 12 13 14 Go to the Y view lt F gt to seethe whole boat OK here Look at the lt Z gt view OK heretoo Rotate the mode and admire your work Good enough Let s keep it File gt Save As DEMO2 lt Yes gt to replace an existing file This should match our distribution model DEM OTR3D M S2 Stern editing discussion A little planning ahead can make a big difference in MultiSurf Anticipating that we might want to change the rake of the DEM O TR3 transom we constructed the transom in a frame The frame was oriented so that by moving a single point we could modify the transom rake Actually this is only one of several relationships we built into the transom A nother that we briefly mentioned is that the snake that forms March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 64 Interacting with Models Realign stations the transom edge also is the third master curve for the hull maki
218. surfaces desired for that contour creating 3D polylines that trace the surface s at that location control points The point entities used to define the shape of a curve or snake entity March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 182 Glossary of Terms Working with Components wrap up control curves The curve entities used to define the shape of a surface coordinate singularity A location u v on a parametric surface where the mesh of u v coordinate lines fails to provide a unique normal direction because of some form of collapse of the mesh the rate of change of the surface point with respect to either u or v is Zero or the rates of change of the surface point with respect to u and v are parallel A poleis a common form of coordinate singularity A place where the u and v directions are either identical or opposite is another kind of coordinate singularity Certain calculations break down at a coordinate singularity The differential element of area associated with differential changes of u and v vanishes cove stripe Nav Arch A decorative stripethat runs along the hull of a boat not far below the sheerline from near the bow to near the stern C spline A continuous curve defined by a series of control points The C spline curve passes through its control points in sequence as opposed to a B spline which generally does NOT passthrough its interior control points curve A one dim
219. t P21 the sheerline point of M C2 4 X gt Point or Insert gt Point gt Point Name p0 dz 0 5 Point P21 pre selected Display gt Color red lt OK gt Fig 16 Fig 16 Notice that the Point entity has two parents Point and Frame Thelocation of each Point its Offsets is in relation to each of these parents If no parents are chosen the defaults are the origin of the global coordinate system See Point in Entity Descriptions in the M ultiSurf User s Guide for more information 5 Preselect P31 the top sheerline point in the stern 6 gt Point or press F4 for Insert gt Copy Last Name p1 default dz 0 35 Point P31 pre selected Display gt Color red lt OK gt Fig 17 Fig 17 Create a Quick C spline curve to establish the crown of the deck 7 Clear Selection Set 8 In Tools gt Options gt Entity gt Quick Spline Defaults or just type the letter o set values to C spline Degree 3 and keep Alternate spline creation checked March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 69 Interacting with Models Add a deck surface 9 S or lt S gt to turn on Quick Spline Mode 10 Place cursor at thetip of the bow When the cursor changes to iN you are over the point there Click release and move the cursor aft until you are over the point pO 11 When the cursor changes shape again to indicate you are over the point click release and
220. t the intersection of the centerline and the front of the cabin When you are over the point click and hold down the mouse button 6 Drag the cursor aft along the centerline to just in front of the red master curve that crosses the deck Not only has the point r0 moved but the entire cabin has moved as well In addition in its new position the cabin still meets the deck exactly and the cabin surfaces still fit together exactly Pretty cool yes Want to have another go at it How about moving the cabin way forward 7 Point the cursor towards r0 again Press and hold down the mouse button Drag the cursor directly forward to about halfway between thetip of the bow and the cyan master curvethat crosses the deck Releasethe mouse button Presto The entire cabin moves and all the surface joins remain exact This model is also constructed so you can movethe aft end of the cabin independently of the front The point that controls this is located where the bottom edge of the cabin back crosses the centerline You may not be able to see it right now but it is there itis called r1 and it s also white 8 Click and hold when the cursor is over Ring r1 wherethe bottom edge of the cabin back crosses the centerline 9 Drag this point aft along the centerline to where the red master curve crosses the deck So how do you like that March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 24 Views and Viewing Moving a b
221. table entity if you want it to shift 55 Contours filter 63 control curves changing which curves support a surface 107 making a set that will create a surface ending normal to a plane 102 specifying support curves for a surface 103 control of view 11 control points adding 97 B spline tangency 94 selecting as parents for a curve 4 Copy Last Insert M enu 95 cove stripe 67 C spline curve with straight portion 116 C spline Curve 85 C spline Curve degree 1 does not meet points in graphic view 85 C spline Lofted Surface 89 119 C spline Lofted Surface always attached to first curve 57 Ctrl dick to add entity to Selection Set 37 Ctrl arrow keys 12 Ctrl shift click 97 curvature profile 86 curvature profile of curve 59 curvatures surface Gaussian 117 118 curves Arc 76 AeroHydro Inc Marine Tutorials User s Guide e 195 Index B spline Curve 86 C spline Curve 85 Projected Curve 91 102 SubCurve 80 Curves filter 41 cutter rig 127 cylindrical transoms 61 139 D decks cambered 122 component arc lofted 163 C spline Lofted 122 C spline Lofted Surface 68 developable 122 ruled surface 122 without camber 122 default plane 39 defaults location for point objects 45 symmetry display 21 degrees per keystroke rotation 13 dependency 116 developability checking for 117 Distance Tools Menu 128 distribution of curvature along curve 86 of surface curvature 117 divisions for actual parts 133 for N C cutti
222. tch our distribution model T2ROW3 M S2 10 F5 and rotate to see the symmetry image as well 11 Clear the Selection Set To dothis you can dick X or choose Select Clear Selection Set or press lt Ctrl L gt or left mouse button click in white space or you can even click on each entity in the Selection Set and click X March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 40 Making a Simple Model Making a watertight horizontal bottom Filters 1 We would liketo take a look at everything we have created so far but remember that we hid the side surface H ow can we select an entity if we can t see it on the screen There are several ways we can show this surface again we ll demonstrate one that uses the Available Entities pane We will usea filter to help us 1 Select Hidden This is one of thefilters MultiSurf offers Setting a filter makes only the objects that fit the filter available in the Available Entities pane Our Available Entities now consist only of hidden objects and the default entities which are always available Part of being available is being ableto pass through any filters that might be set In this case we have the Hidden filter set so the only entity available to be put in the selection set other than the default entities is our hidden object the side surface side 2 IntheAvailableEntities pane click side This puts side into the Selection Set 3 Fromhere you can either click Q or S
223. terior surface manipulation for any other profile matching if needed The model will be put together in such a way as to be dependent on the profile sketches When we change the profile the surface updates with no further editing needed Getting Started The Upper Profile Open a new ms2 SolidWorks Integration users should use the stand alone version of MultiSurf If working with SolidWorks and MultiSurf go to SurfaceWorks M odeler This first step is to insure users of MultiSurf stand alone and the integrated version are working in the same coordinate system SolidWorks has a left handed system and MultiSurf Solo is right handed This is a good opportunity to practice relations to Frames and the use of RPY Frame handedness l Insert Point at 0 0 0 2 Insert Frame RPY Frame using the above point as a parent 3 Select the RPY Frame and create a Point at 0 0 36 Rename this Point Center March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 149 Procedural Surface Tutorial Getting Started The Upper Profile Select the RPY Frame and point Center and press lt F4 gt on the keyboard Locate this point at 48 0 0 Rename this Point Start Select the RPY Frame and point Center and press F4 on the keyboard Locate this point at 0 12 0 Rename this Point Guide Select the poi Start Center and Guide in that order 4 Insert Curve Arc From the drop down
224. ters not just the class filters back to the program defaults all Class filters ON the Current Layer Only filter to OFF and the visible hidden filter to Both we can take advantage of it here because our non dass filter settings are the same as the defaults Select2Class Filters Set All would havereset only the class filters 2 Now click side again success March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 42 Making a Simple Model Creating the transom surface 3 Va gt Edge Snake or Insert gt Snake gt Edge Snake Name tr side remember you can just type tr side and the program fills in theunderscore Surface edge u 1 Surface side pre selected lt OK gt One curveis not enough to build a Ruled Surface so we will project tr side onto the centerplane for the other one Remember that the parents for a Projected Curve are a curve and a mirror tr side is already selected 4 n gt Projected Curve or Insert gt Curve gt Projected Curve Name tr ctr Curve tr_side pre selected Mirror Y 0 lt OK gt And now for the transom surface 5 Preselect tr_side and tr_ctr 6 e gt Ruled Surface or Insert gt Surface gt Ruled Surface Name transom Control curves pre selected u divisions 8x4 v divisions 1x1 OK Fig 7 This should match our distribution model T2ROWA M S2 Fig 7 Rowboat model with thetransom surface added H ome v
225. tiSurf will only let one coordinate of the point change 3 Drag P12 forward alittle bit to where it is as near as you can makeit on a line between P11 and P13 MCI should now be nearly straight Fig 5 If not you can adjust it again We are utilizing a property of a type 2 B spline Curve if 3 consecutive control points are on aline then a well defined portion of the curve will be perfectly straight March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 57 Interacting with Models Reshape the stem Fig 5 However adjustment by eyeis never going to get this curve perfectly straight What can we do to makeit right We ll take advantage of MultiSurf power to capture relationships between entities 4 m again to turn off Orthogonal Dragging Make a durably straight stem To make a durably straight stem we ll usethe B spline property that if 3 consecutive control points lieon a line a portion of the B spline curve will be straight H ere are the basic steps we ll follow l createa straight line guide between P11 and P13 2 putabead on the Line 3 substitute that bead for P12 as the second control point for MCT Ready Create the new entities Create a Line from P11 to P13 just for practice we ll do it without preselecting supports 1 gt Line or Insert gt Curve gt Line Name guide Endp
226. ticular entity describes the role of those data items and presents one or more examples Entity List The Entity List serves as a container for a list of entities This would be useful if for instance you wanted to perform repeated operations on a group of entities and wanted to be ableto select this group repeatedly March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 184 Glossary of Terms Working with Components wrap up entity name An entity name identifies a specific entity eg top might be the name of a Point located at X 0 Y 20 Z 10 Every MultiSurf entity has a name entity names within a model must be unique exponential notation Exponential notation also called scientific notation is a compact way to write very large and very small numbers A number in exponential notation is written as one number followed by an e or E followed by a second number To read the number you takethe first number and multiply it by 10 raised to the power of the second number positive or negative Examples 3 124E4009 3 124 x 10 3 124 x 1 000 000 000 3 124 000 000 2 477E 005 2 447 x 10 2 447 x 0 00001 0 00002477 fair adj A fair curve or surface is one that is smoothly curved It may have necessary inflections e g a wine glass cross section but it has no humps or hollows or abrupt changes in curvature verb To fair a curve or surface means to make it smoothly curved removing any humps
227. ting curves In a lofted surface the lofting curves are the curves sprung across the master curves to form the lofted surface the u constant parametric lines The control points for each lofting curve are points at equal t values or 1 t on each of the control curves longitude Oneof the viewing angles used to control the camera position and orientation angle of rotation around the vertical axis longitudinals Nav Arch Thefamily of parametric lines that run fore and aft on a boat hull are sometimes called longitudinals For example these would be the u constant parametric lines the lofting curves on a typical C spline Lofted Surface hull with transverse master curves like DEM O M S2 look point The location at which the camera that records the view is pointed the center of the orbit sphere when you rotate the camera The default look point when you load a model is the center of the bounding box the program uses to frame the image on the screen basically the center of the model You can changethe look point by panning magnet A point constrained to lie on a surface master curves The series of curves used to define the shape of a lofted surface March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 187 Glossary of Terms Working with Components wrap up mirror The plane line or point used for reflection of a Mirrored Point Mirrored Curve Mirrored Surface or for projection of a Projected Point or Pr
228. tion falls The u direction is in the direction of the sweep And the v direction follows the cross section It would be our suggestion to change theu divisions of that surfaceto 8X8 and to match the divisions of the cross section curve in the v direction at 8X16 There is plenty more to do before anyone gets wet but the hard part is done with this surface March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 157 Working with Components Introduction A MultiSurf component is a group of objects captured in a special file which can be imported into a MultiSurf model as a group in a single operation File gt Component gt Load The component objects usually have dependency relationships amongst themselves which are maintained intact during the component load Further the component objects can have dependencies on other objects not induded in the component these dependencies are transferred to existing objects in your model This allows the component to adapt itself automatically to the existing geometry of your model and to become a full participant in its dependency structure Oncein your model the component can be scaled repositioned edited and modified just like any other MultiSurf entity to accommodate your specific requirements and preferences MultiSurf components are a powerful tool because they allow usto take chunks of geometry from one model and put them into other models without having to construct them object
229. tive normal direction is into the hull you can seethis better in the if you rotate the model so we will need to use positive offset values Back or still in the Home view 3 e gt Offset Surface or Insert gt Surface gt Offset Surface Name inside Surface hull pre selected Single Offset radio button Offset 2 Offsets are in the same units as the model in this case feet Display gt Color blue Advanced gt Divisions 5x2 5x4 lt OK gt 4 Edit the definition of stations red For Surfaces to cut add inside lt Ctrl gt click it in the drawing or the Entities Manager 5 Clear the Selection Set Now you can see that each station contour is doubled We are seeing each contour cutting both the original hull and the Offset Surface inside If you move left arrow over to Lon 40 or 50 you can see this even better Fig 26 Next we ll set up stations for the 2 ft spacing we want for the frames and we ll make those contours cut only the inside surface 6 Edit stations again Index of first contour 0 Index of last contour 14 Signed distance from Mirror Surface to 0 index contour 1 Contour spacing 2 Surfaces to cut inside either remove hull from the Selection Set or dick on inside to replace the current Selection Set with inside lt OK gt 7 Select hull and hide it so it doesn t clutter up the picture March 24 2011 A
230. tons or View Nametags show you the names of selected dasses of entities Filters are very useful tools especially when selecting from the A vailable Entities list in the Selection Set window and in more complex models consisting of many entities If all the class filters are on and you want to filter just for points 1 Y you can dick the Points Filter off then click Invert Filters di Zoom to Fit or lt F gt sizes the view to fit the screen and center the screen image Y ou can also use the center mouse wheel lt PgUp gt and lt PgDn gt or Qr March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 161 Working with Components Hull skin and contours and dick and movethe mouseto Zoom In and Out and Q to Zoom to Selection And don t forget center mouse button dragging and the arrow keys which let you take a walk around your model and admire it from all sides Hull skin and contours Back to our boat the first thing we ll add is a component that skins these 3 master curves 1 First select the 3 master curves in order click lt Ctrl gt 4click lt Ctrl gt click bow to stern rightto left in this view we re actually preselecting them as Parents for the component we will load 2 File Component Load 3 IntheLoad component dialog pick CLFTHULL MC2 from the WultiSurf Tutorials folder 4 IntheResolving Parents dialog note the message Component consists of 3 objects Required Parents 3 In th
231. two control curves In general a B spline Lofted Surface with morethan two control curves is not ruled In this case however because of the way the three parent curves are related this is still a ruled surface Both surfacel and surface3 are tangent to this surface surface2 This join is G1 continuous slope surface1 surface2 RAMA WW Fig 19 Lat 3 6 Lon 62 2 Tilt 57 5 5 Drag pt23 or pt24 around and watch the surfaces adjust all the while maintaining tangency at their join You ll probably have to rotate and zoom to get the best view Cool 6 Close without saving and exit March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 107 Marine Design Examples Overview MultiSurf has broad applications throughout the world of engineering design At AeroH ydro the focus of our engineering experience and expertise is in the design and manufacture of boats and ships so it is natural that in the short history of MultiSurf we have already created hundreds of models exploring and demonstrating marine applications For our naval architect friends wetakethis opportunity to present and discuss many of these models We hope that non marine users as well will find it worthwhileto explore these examples with us to meet additional entities and techniques for real world applications of MultiSurf Entity introductions Contours Developable Surface Offset Surface Plane Co
232. u O longitudinal C splines on both surfaces are identical 3 E Point nametags The points D23 D33 D43 along the deck centerline are Projected Points based on D22 D32 and D42 respectively This ensures that each of the deck beams meets the centerplane orthogonally so the deck has continuous slope across the centerplane 4 Turn on Symmetry Images F5 to see this Close HULLDECK Developable deck no camber For a deck that has no camber a Developable Surface is very handy because it s so easy to build For this next model we ll create a Ruled Surface in the shape of a general cylinder Recall that while all Developable Surfaces are ruled surfaces N OT all ruled surfaces are developable A general cylinder is one of the special cases of ruled surface that is indeed developable 1 Open PWRB2 2 GotoLat 30 3 gt Projected Curve or Insert gt Curve gt Projected Curve Name deck ctr Curve sheer magenta Mirror ctr plane Fig 16 left lt OK gt 4 e gt Ruled Surface or Insert gt Surface gt Ruled Surface Name deck Control curves sheer and deck ctr Advanced Divisions 16x1 1x1 Fig 16 right This closes the hull in with a flat across deck that durably joins the hull March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 122 Marine Design Examples A Movable Bulkhead Fig 16 5 Turn on Symmetry Images and see what you have
233. ues on the status bar the 3 values in parentheses to the left are the absolute coordinates 2 Try to drag the bead sideways off the curve You can t of course because beads are constrained to lie on a curve You can however drag it off the end of the curve because M ulti Surf defines a curve beyond its user defined endpoints 3 Finally click on the bead and type in its position at t 0 7 Let s show the side again 4 Click o or Show Hide gt Show All 5 Click k or File gt Save This should match our distribution model T2ROW5 MS2 Not bad Adding thwarts Still something missing from our boat Well it would be nice to have something to sit on We ll want thwarts attached to the sides As usual the starting point is just that a point in this case a Quick magne Looking at u v surface parameters Just as a bead is a point that stays on a curve a magnet is a point that stays on a surface How do welocate things on a surface Well any MultiSurf surface has two parameters we call u and v which are similar to the single parameter t on a curve u and v vary independently each over the range of Oto 1 The mesh of lines that we use to display a surface is made up of two families of curves one family running in the u direction along constant values of v and one family in the v direction along constant values of u We ll use the side surface to demonstrate the u v mesh Ruled Surfaces generally are displayed using o
234. ulkhead 10 Now click and hold on rO again at the front of the cabin We re going to movethe big cabin 11 Drag rO aft along the centerline to where the cyan master curve crosses the deck How can MultiSurf do all this Well here arethe basics 1 When you create a model in MultiSurf you build it up from point objects to curve objects to surface objects 2 Inthe process of creating objects you specify particular relationships between objects for instance that curve X passes through points A B and C MultiSurf retains all these specified relationships as part of the data it stores to represent the modd 3 When you make a change in a modd MultiSurf automatically updates the entire model checking and maintaining all the relationships specified between objects for instance if you moved point C MultiSurf would update the position of C and recreate curve X so that it still passed through point C as well as points A and B That s just what you have seen with the cabin deck model In this case some of the defined relationships are the point rO is constrained to lie on the centerline of the deck all parts of the cabin liein specified relationship to the point rO therefore when you movethe point the whole cabin moves the bottom curves of the cabin sides and front are special curves that must lie on the deck surface therefore when you move the cabin the cabin deck joins always remain exact T
235. ult folder for loading your software is CA Program Files AeroH ydro MultiSurf In this folder are loaded all of the files needed to run MultiSurf Under this folder are sub folders for Tutorials Examples and Tutorial Files Because you are free to load MultiSurf in another folder which you name we will refer to the location of certain files as for example Tutorials This means they are found in the Tutorials sub folder located wherever you have loaded MultiSurf If Your Screen Doesn t Match Our Instructions If at any time during the process what you see on your screen looks very odd or doesn t seem to match what we write about it don t dismay You may have done something as simple as clicking the View Port button instead of the March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 2 Introduction Some Basic Terminology View gt Starboard one First check back in the tutorial and be sure you are looking from the same viewpoint including perspective orthographic If that s as should be you ll need to check your model against the tutorial sequences and or against one of our distribution files For the longer tutorials we have included some intermediate model files with your MultiSurf distribution for along the way assistance Periodically during the tutorial we note where they fit in e g This should match our distribution model TANGENT2 ms2 These files are located in the Marine Tutorials folder There
236. ursor location March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 18 Views and Viewing Pan to center Pan to center Before we get into this section let s get the view set so weare starting off at roughly the same point 1 Choose Starboard view and Zoom to Fit 2 Choose Q Zoom to Area and drag a box around the bow Now let s say you want to examine the full length of the hull at this enlarged view You could do this by choosing or by pressing lt Ctrl gt Heft arrow numerous times Here s another way to pan it lets you choose the location in the drawing that will become the new center of the image To pan the length of the hull 3 Choose a and move the mouse cursor to the left edge of the drawing area about halfway down from the top 4 Click and release the left mouse button without moving the cursor The location you clicked becomes the new center of the image 5 Repeat By dicking successively you can move the camera along your enlarged view of the boat and in a number of pans examine the whole length of the boat in detail Fig 9 6 Press Homes to return to the original view TTT Fig 9 Save 2D drawing files Looking at pictures on the screen is great but how can you makea hard copy And how can you get these pictures into a CAD program as a basis for more complex 2D drawings The answer is a DXF file intended for input into 2D CAD programs Any
237. ution file TAN POINTS2 ms2 Fig 12 7 Drag pt and noticethat the tangency is maintained at ptT Similarly if you wereto drag pt3 tangency would be maintained at pt4 Notice that you cannot drag the two Mirrored Points pt5 and pt6 8 Close the model don t save changes Tangency Between Surfaces Everything we ve said about B spline Curves so far can be applied to B spline Lofted Surfaces as well Just as the B spline Curveis tangent to the line between the end and next to end control points the B spline Lofted Surface is tangent to the imaginary ruled surface between the last two control curves 1 File gt Open TANSURFACE11 ms2 from Tutorial Files 2 Select the upper curve xcv7 and the plane then make a n gt Projected Curve or Insert gt Curve gt Projected Curve OK to accept all defaults 3 Select the lower curve xcv14 and make another Projected Curve OK to accept all defaults Fig 13 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 102 Building Tangency with B splines Tangency Between Two Arbitrary B spline Lofted Surfaces Fig 13 Now when we loft a B spline surface over these curves the upper Projected Curve the upper spline the lower spline and the lower Projected Curve the lofting B splines that pass through each of the four control curves will end normal to the plane Let s do it 4 Select xcv15 xcv7 xcv14 and xcv16
238. w Selection Set 41 March 24 2011 Sink hydrostatics 130 skin deduction 131 Snake defined 42 snakes B spline Snake 88 Edge Snake 43 snaps 87 spars 127 stations realignment 65 stem durably straight 58 reshaping 56 stern reshaping 61 rounded 114 stripe cove 67 SubCurve 80 SubCurve change curve parameterization 80 superstructures durable joins 124 Surface Curvatures Tools Menu Gaussian 117 Surface Manager 9 surfaces B spline Lofted Surface 90 compound curved 119 C spline Lofted Surface 89 119 developable 117 mixing developable and compound curved 119 Offset Surface 131 orientation 45 Ruled Surface 32 37 117 122 Tangent Boundary Surface 116 Surfaces filter 63 surfaces should be made between curves of similar t distribution 83 SurfaceWorks exiting 26 49 Symmetry Images 21 T t parameter 44 tangency between surfaces 102 AeroHydro Inc Marine Tutorials User s Guide e 199 Index between two arbitrary B spline Lofted Surfaces 103 B spline Curvetangent to Line 98 B splineloops 96 endpoint tangency property of B spline Curves 95 tangengy principle of B spline Curves 95 using Mirrored Curve 100 using Mirrored Points 101 Tangent Boundary Surface 116 tickmarks 44 Tickmarks 83 Tile Vertical 23 tilt definition 12 Tools gt A dopt Children 47 84 Tools gt M ass Properties 119 Tools gt M easure gt Clearance 136 Tools gt Options 31 Tools gt Options Dragging Dragging Orthogonal Dragging 57 90
239. w is much more pictorial Fig 3 left The Orthographic view is like a picture taken from very far away with along telephoto lens Fig 3 right March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 15 Views and Viewing Help side trip Fig 3 Perspective view left and orthographic view right of DEM O modd at Lat 10 Lon 20 Orthographic views along the axes are most commonly useful and these are instantly available by use of toolbar buttons or keyboard letter presses The choices are D e F ce e or View gt Marine View Orientation Bow Stern Port Starboard Deck Keel Theseare also choosable buy using the keyboard lt Shift X gt X lt Shift Y gt Y2 lt Z gt and lt Shift Z gt Shift X Y or Z looks in the positive direction along the axis toward the end of the axis that is labeled X Y or Z X Y or Z looks in the negative direction toward the unlabeled axis end For example Press Y This gives you a profile view of this hull use PgDn or lt F gt if you can t see the whole boat looking toward negative Y and with X increasing toward the left you are looking at the outside of the starboard side of the hull Fig 4 Fig 4 Press lt Shift Y gt This also gives you a profile view but looking toward positive Y and with X increasing toward the right you are looking at the inside of the starboard side of the hull Fig 5 Fig 5 Press Z This showsthe
240. ween two ends of a single curve or surface and between two different curves or surfaces After finishing each section dose the model files without saving the changes Entity introductions B spline Curve B spline Lofted Surface Mirrored Curve Mirrored Point Mirrored Surface Projected Point Relative Curve Concept and Function introductions B spline Curve ending normal to plane plus mirror symmetry makes G2 join B spline Curve is tangent to the line between its end and next to end control points B spline Lofted Surface ends normal to planeif 2nd last curve is projected onto plane of symmetry B spline Lofted Surface with 2 control curves is ruled surface Ctrl shift click adds second instance of entity to Selection Set G1 continuity G2 continuity Select B spline Curve points in spatial order Tangency across a Mirrored Point Tangency between 2 arbitrary B spline Lofted Surfaces Tangency between B spline Curve and Line March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 93 Building Tangency with B splines B spline Curves The Endpoint Tangency Property Here arethe basic steps we ll follow e Create durable relationships between two ends of a curve or surface e Show curvetangency by displaying polylines Connect the ends of a B spline curve into a smooth loop e Makethe end points of a spline normal to a plane and mirror that spline Take the concepts learned about curves and apply them to surfaces e Maketw
241. with B splines 103 AeroHydro Inc Marine Tutorials User s Guide e 197 Index model beginning a new one 31 durable properties of 49 model disappears from window 5 mouse pan 14 mouse rotate 13 mouse zoom in out 14 mouse zoom to area 14 moving a bulkhead 123 a cabin 124 multiple graphics views 23 N Nametags Point 23 New File Menu 31 New Model Window Window Menu 23 O oarlock 44 Offset Surface 131 132 Offsets View Menu 128 online tutorials following the tutorial sequence 1 orientation marks surface 45 of surface 45 Orthogonal Dragging 90 orthographic view 15 P paint job component 177 panning with mouse 14 parameter t44 u 45 v45 Parent Child box 22 perspective view 15 planar sheerline 134 transom 120 planes base 54 planing powerboat 141 Point 69 81 points drag in plane of screen 36 March 24 2011 Points explained 36 Points filter 41 PolyCurve 81 polyline display B spline Curves 95 POV files 21 powerboats 115 122 126 planing 141 pre selected entity 37 Preserve A bsolute Location 36 Preserve Offset Values 36 preserving relationships in a model 41 Previous View 18 Projected Curve 39 91 102 creating 102 using to make surface end normal to a plane 103 Projected Point creating 100 using to make B spline Curve end normal to a plane 100 Q Quick Bead 59 Quick Beads and Rings snap to curve 46 Quick Magnet 45 Quick Ring 46 quitting SurfaceWorks 26 49 R rad
242. work on thelower surface beginning by making a Relative Curve that will control its tangency 1 e Home view 2 With pt23 at the left end of curvel still selected make a gt Mirrored Point Name pt25 Point pt23 pre selected Mirror pt17 OK 3 Select pt24 and pt22 in that order and make a second Mirrored Point Name pt26 Point pt24 pre selected Mirror pt22 pre selected OK Now we ll make a second Relative Curve also with the same entity orientation as curve2 4 Select curve2 pt25 and pt26 in that order and make another Relative Curve Name this Relative Curve relcvlower OK Fig 18 March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 106 Building Tangency with B splines Tangency Between Two Arbitrary B spline Lofted Surfaces Fig 18 The Lower B spline Lofted Surface 1 Select curve3 relcvlower and curve in order These will be the control curves for the lower B spline Lofted Surface 2 2B spline Lofted Surface OK For visualization let s extend the ruled surface straight through to the second Relative Curve 3 Edit the brown surface surface2 4 Inthe Edit dialog the Control curves field is active In the graphic image or in theAvailable Entities pane add relcvlower OK to the Edit dialog Fig 19 This surface started as a ruled surface because it was a B spline Lofted Surface with
243. x For instance Grid 0 1 means each Grid lineis 0 1 units apart and every unit is a bold line Grids are available only in orthographic views that are parallel to one of the axes The Front View is parallel to both the X and Y axes so we see both vertical and horizontal grid lines in this case If this is confusing to you it may be because as you look at the screen your line of sight is perpendicular to the plane of the screen in this casethe X Y plane but the image the View is on the X Y plane and is therefore parallel to it Note that HE or lt G gt is a toggle pressing it again would toggle the grid off leave it on for now 5 If necessary Zoom in until the Y 10 grid lineis in the window 6 Q o Show points and turn on point nametags 7 or F7 or Tools gt Options Dragging Dragging Orthogonal Dragging Orthogonal Dragging constrains points to move only vertically or horizontally with respect to the plane of the screen 8 Drag P31 out to Y 10 x 9 G toturn off grid and to turn off point nametags March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 90 Introducing More MultiSurf Entities Projected Curves 10 Rotate around the model to see how the surface especially the upper edge the sheerline stretches out toward the edited master curve yellow as if attracted to it 11 Close BLFT5X4 Projected Curves 1 Open PROJCRV1 ms2 Fig 20 This isthe DEMO hull model
244. xture of concave and convex at any intermediate heel it changes all at once passing through zero as your eye passes through the plane the minor discrepancies noted above notwithstanding 26 Close the Curvature Profile and Hide the plane and points 27 Turn Symmetry Images on March 24 2011 AeroHydro Inc Marine Tutorials User s Guide e 137 Marine Design Examples A Planar Sheerline 28 Revisit the foreshortened perspective views from near Lat 0 Lon 180 From all directions now including Lat 5 Lon 175 Fig 35 the planarized sheerline presents either a straight or simple parabolic projection no loops no kinks no flat Spots pure grace and beauty Fig 35 Alternative durably planar sheerline constructions March 24 2011 There are two ways a more durably planar sheerline could be accomplished for this modd 1 Thisisour recommended method We walked you through the previous method because it allowed us to introduce you to added program features Start the design off by creating a Translation Surface sheer plane in the position of the 3 Point Plane a0 P11 could naturally be one corner of this Translation Surface but P21 P31 P71 would be magnets on sheer plane instead of Points 2 Thisonetakes off from the example we walked you through Create four Projected Points say P21p P31p P51p P61p from P21 P3T etc projected on the plane a0
245. y A WireFrame entity is a 3DA or PAT file which can beincluded in a model primarily for display or comparison purposes The result of including this file is a wireframe entity which cannot be used in the construction of other MultiSurf entities For example a curve represented in a WireFrame entity cannot support a bead and it cannot be used as an edge of a surface wireframe image An image of a model in which surfaces are represented by meshes curves and contours by polylines and points by little dots A wireframe is essentially transparent you can see between the wires and when part of a surface is behind another surface you can still see it zero velocity point You can think of the parameter t on a curve as time and the curve as being the path of a moving point ast goes from 0 to 1 The parametric velocity of the point is the rate of change of its position with respect to t A zero velocity point t position on a parametric curve or snakeis a place where the parametric velocity vanishes At a zero velocity point a small change in the parameter t causes no change in the 3D location of the moving point This can be caused by a variety of situations including doubled control points on a degree 2 or lower B spline Curve a point serving as a curve an ellipse with a zero major or minor axis Some calculations will fail at a zero velocity point for example the tangent direction is not defined March 24 2011 AeroHydro I
246. y E again to get 4 more objects ES adds 2 Magnets to the Selection Set ah one last time You get the hull this time We want to attach to a hull not have it in the component so Remove it from the Selection Set File gt Component gt Save The Component Save dialog says the component will consist of 12 objects and needs one support Typein the ID message rub rail then lt OK gt Give it the filename COMPONENTRAIL and put it in the MultiSurf Tutorials folder Putting the rub rail on the tutorial model Now onto the hull with this rub rail Back in the COMPONENTBOAT 1 2 3 5 Preselect the hull File gt Component gt Load gt COMPONENTRAIL MC2 In the Resolving Parents dialog C spline Lofted Surface hull is preselected as a support lt OK gt The Resolving Names dialog reports no name conflicts but type in the prefix g anyway lt OK gt to Edit gt Attributes ayer 6 This rub rail will need to be modified slightly to work Editing the rub rail 1 Switch to lt y gt view and zoom in around the forward end of the rail al to turn on Curve Nametags and select the Arc gshape amp to Zoom to Selection this will make gshape the new look point and then zoom out a little Use the center mouse wheel or the left arrow button to rotate the model left until you are looking at the profile of the rail You can seethat it is not a bump as it should be but a scoop shape We need to ma
247. ynamic advantage Let s do both Move P34 First let s add some length by moving a single point to X 32 We ll zoom in to find the point then zoom out so we can see how the entire model updates when we move the point 1 Makesure you are still in or Y gt view 2 Select point P34 fromthe Entity Manager and click amp or View gt Modify gt Zoom to Selection 3 Click Qh and zoom with the mouse to make the whole stern visible as 4 Tools gt Options Dragging Snap Set All to turn on all snaps 5 Orthogonal Dragging We re going to move P34 straight aft 6 Return to Select Mode and drag P34 aft to X 32 Z stays at 0 4 Noticethat the transom stays accurately joined to the hull and that it retains its curvature and rake Introducing the transom When we constructed the cylindrical transom for DEM O TR3 we kept in mind that we might want to modify it at a later date We built in specific relationships that make it easy to changethe rake the radius and the width of the cylinder while maintaining the watertight join to the hull We ll discuss the rakeissue here To allow easy modification of the transom rake we used a Frameto hold it The Frame has an x y z coordinate system of its own March 24 2011 AeroHydro Inc Marine Tutorials User s Guide 61 Interacting with Models Reshape the stern 1 Right arrow 3times and down arrow 3timesto latitude 30 longitude 120 x 2 toturn off Point N amet

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