Report - Computer Science - Australian National University
Contents
1. lt key for move to parent child menu If current menu doesn t have a child will select current item TL key for moving up down highlighted item For walk mode lt key for moving left right T key for moving ahead back W S key for pitch up down A D key for yaw left right Page up down for pitch up down 36 For examine mode lt key for rotate target building left right T key for push away pull close the target building W S key for moving view up down Page up down for moving view up down e Domino configuration Domino configuration is not component of the software application itself Domino can be setup through the domino control panel which could be found in the control panel of OS in the wedge Every key on the domino can be mapped to a specific key of keyboard Then the key of domino can function as key of keyboard Project comments 8 1 Problems e Loader problem A powerful loader is critical for this application because all features of VRML data need to be loaded and displayed Texture and billboard could give user a better presentation of the 3d campus and LOD behaviors may save a lot of computing resource In the implementation I tried with two loader J3d vrml97 and Xj3D loader J3d_vrml97 does support the texture and LOD behavior The LOD behavior automatically applies when the scene is loaded and you don t have to manually configure such behavior in Java3D But this loader2. For pitch up down rotateT3D rotX da viewT3D mul rotateT3D 5 12 Examine controller ExamineController java Figure 7 Examine algorithm In the Java3D application OrbitBehavior suppose to provide such kind of operation with mouse But actually in first version of this application 3d mouse is not implemented Thus such kind of behavior needs to be implemented manually In figure 6 suppose the black point is the center of a building and a user wants to rotate the building to the left This is same as the user move to the right of the building Here suppose user moves from A to B along the circle original at the center with radius r I mathematically calculate the position of B and then rotate back an angle from A to B The math formulas are x_b x_c x_a x_c cos angle y a y c sin angle y_b y_c y_a y_c sin angle y_a y_c cos angle Where b is for position B A for position A c for center and angle is the angle from A to B 29 5 13 Status KeyState java tea tea Figure 8 Finite state diagram In the application the states are defined as finite state The application has walk menu examine and tour state For different states the input keys are binded for different purpose As tour state is an animation which is being executed without any key input and return to previous state when the animation is finished So the tour state is ignored and only the above t
3. campus 3 Specific requirements 3 1 Event and action list Event Action Condition Events for 2 2 1 User starts the application Map of campus displayed to the user from the top view Menu will be displayed Help info will be available Campus data in vrml file available User inputs intent visit buildings through command line when starting application Intent visited building available on the relevant menu items The building data is in the vrml file system User selects Exit Menu item or press key Q The application should exit None User press key Esc The menu should be displayed or hidden depending on if menu is displayed At any time when user is in control of the application User presses the space key Current menu item is selected If current item has submenu then submenu is displayed Application is on the menu status User press up down left right arrow keys Different levels of submenus should be displayed to user User can also use right arrow key to select a menu item Application is on the menu status User select Help menu Help information shall be displayed to user The information will include key functions and other user guide Help information not displayed User select Help menu Help information shall be Help information is again h
4. has bad error tolerance and the application will get a lot of strange exceptions and exit 37 Current Xj3D loader is currently at milestone version 10 and is not a formal release It doesn t flexibly support texture For the campus map which is a texture the loader works well but it doesn t support the texture of building in input data It s because the texture of map is mapping to 4 points while building texture is mapping to an extrusion of a line It also doesn t support LOD well I have sent the demo code and vrml file to one of the sun Xj3D maintainer Hope in the next release of this loader they will fix the problem e Color problem I found this problem in the test stage The problem is color of menus at the top view of the campus The designed color is red with green for highlighted item It works well when using two screens in the wedge but doesn t work well when using one screen Both colors become yellow and make user very difficult to distinguish which one is highlighted While at other views than top view it works well I have talked this to James since the menus are modification of his code But neither of us has got the reason 8 2 Future work e Loader Loader problem needs to be solved in the future version of this application as textures can give user a much better campus scene Probably change the mapping format of buildings to mapping format of campus map will make the texture work But th
5. tour work well on both platforms e Wedge with one two screens This software is also tested on the wedge The wedge is configured with two screens and the scene will be divided into the two screens when the application is launched in the wedge Because one screen of wedge is temporally not working so the application is modified to run on one screen This introduces a minor problem that at the startup the color of menus becomes yellow not red with green for highlighting as designed Then it makes user confusing because user is not able to distinguish 32 which item is highlighted After user takes some behavior operation eg select a specific building and then color becomes normal Problem only appear at the top view This is a strange problem as the color is ok with two screens but has problem with one screen All behaviors work well on the wedge with both one and two screens e Input data The software suppose to import the vrml file from project Campus3D carried by Mr Enlai Yi so I tested two version of input VRML data as the test stage One version of such data is integrated into the software package as demo data and the other version is the data with fewer buildings Both versions work well with the software e User interaction Interaction includes user interact with application using domino keyboards thus executing a series of behaviors for some user scenarios During all above tests all functions provide
6. Australian National University Comp 6703 eScience Project Semester 1 2005 Visit ANU Campus in the Wedge VACIW Examine Mode e e 5 Hee a Student Feng SHEN Id u3390679 Supervisor Pascal Vuylsteker 1 Oger Te TO EE 3 LiLo Project SCOPC nama a Ans A ase ast aati ain RG PA naan 3 1 2 Project Management 3 2 Overall Description iii senses cei cath Ga asta erte 4 21 Product perspective PA 4 2 2 High level functions eebe SEENEN GA BELO EEN 5 3 Specific e UU E CT 6 3 1 Event and action list jcc NN giscaedeivces gis cath EiL AEN NAE eaat 6 3 2 Detal require ments 3230 sceiesvsseevesviigevesbscadvonesigeveahs eege AETA GANA AA 9 d Design Description AA PANA AA ed es 11 dI Disien MECH OM GAGANA KAL NANANA NING AG NLA AND 11 42 Data description isc sci nhl seis ah ae ae Saati tis Beanie we Satan nae 11 4 3 GUBTESIEN TTT 13 d4 AA 14 4 5 Application scene graph ec cee seesesseeeseeeseeeseeseeeeseeseeeescecseeeeeesseeseeeceeeceeeeeeeenaeenes 16 dp Class AA 17 4 7 Class deseriptig eck dee Nee Eege ee geed rege keen AALALA 17 5 Software implementation Lasa AA BANA BINAN NANANA 19 5 1 Menu structure SubMenu java amp Menultem Java 19 5 2 Exploring Menus Menu3D java amp SubMenu java cecceecceececeececeeeeeeeneeeeeeeee 21 5 3 Dynamic menu items Menu3D java 22 5 4 Intent visit buildings Menu3D java 23 5 5 Viewpoint BuildingDataSet java amp Campus Iava 23 5 6 Internal datab
7. The application mode should None mode be changed to examine mode User press left right The user shall be able to rotate Application in examine arrow key the selected building to mode examine it The center of such kind of rotation will be the center of target building User select tour mode The define tour will guild user Tour mode around the campus This is an animation 3 2 Detail requirements 3 2 1 3 2 2 3 2 3 3 2 4 3 2 5 3 2 6 3 2 7 User shall be able to load the existing data on the local file system The data is not the VACIW application itself but it needs to be installed in the local disk drive The default folder wedge is assumed to hold the local file system The campus will be modeled in vrml language and the data will be stored locally A campus street map shall be displayed to the user when the application is launched User shall be at the top view and have a top view of the campus User shall be able to exit the application at any time An exit menu item should be provided to user and it shall be easy to access on the screen When the application terminates all the campus data shall be remained and not modified A menu system should be provided to user User can explore the different levels of menu items and make selection The arrow keys shall be used to explore the menu space key shall be used to make selection Help information should be provi
8. When it receives user input it needs to get the current status of the application and then decides which behavior needs to responds to the input Each status will have a corresponding behavior object to deal with the key inputs e VRML domain This domain is the data system and they are assumed to be provided and installed locally The data format shall meet the specification of application data requirements 15 4 5 Application scene graph BACK GROUND Building Figure 4 scene graph diagram The campus scene will be loaded and then attached to the wedge as a branchgroup The look and size of menus should not change wherever the user stays in the virtual campus so I attached it to the transformgroup in the view side When the user walks or turns the size of menu will remain same The application does support the background and light The application will extract the data from file system and attach them to the scene 16 4 6 Class diagram GroundPlane BuildingSearcher ObjectScene BuildingDataSet Campus Menultem Menu3D L IN MenuController WalkController ExamineController Figure 5 class diagram 4 7 Class description e ObjectScene class for loading an object from a VRML file The Xj3D loader will be used to load the scene Then the scene could be returned as a 17 BranchGroup object and other properties of the scene like viewpoints light nodes named obj
9. ase Campus Java 24 5 7 BuildingSearcher Buildingearcher Iaxva A 25 5 8 Viewpoint S E 25 5 9 Smooth transition Campus Java 25 5 10 D 8YEAR ENEA A EANN E A 27 5 11 Walk controller OWalkController Iava 27 5 12 Examine controller ExamineController java 11111101111777777 a 29 5 13 Status hee State ett eege edd 30 D Software testing 003 0 a oh aid aad Ha aa alata ead led eet 30 Dh AA 31 G2 SYSTEM E 31 7 User documentation 35 ang a NAINA NG NANANG La duecaveytuocedh eden a a PA ENG 33 7 1 System Configuration os enaa aeiae deeatasccesatesecaeataseszeatvesdesssusrseasivercvestenrcventa 33 Ta User minia ug nn KN us dates dadd BAE ANG 35 S Project commentis NA eet OE ee OE ee eae 37 SE NP 37 8 2 Futire Work ANAN AANI Cd deiere deeg duvide ngdaveed EE 38 H Acknowledgement ies i200 eeng eege iere ANA NN NAGLAAN 39 1 Introduction 1 1 Project Scope From the wedge a user should be able to use some application to explore the virtual ANU campus He is able to see the roads buildings bridges trees and other places of the campus Without having a real visit he can have a generic idea of what the camps looks like This application is called visit ANU campus in the wedge VACIW A project called Campus3D is implementing by Mr Enlai Yi at this semester and will export some data which models the 3d campus in VRML format The scope of the application is to load the VRML campus data from local file sy
10. ata path and intent visit building list could be changed Clear Execute Clear BAT or make clear 7 2 User manual e user guide When the application is launched the scene will be presented to the user from a top view with a 3D menu on the left The menu items are in red color and the highlighted item is in green color All the interactions are through the menu system The menu systems are similar to the normal application menus and the operations of menu are same as other menu system Simple description of main menu Walk Mode to locate a specific building Intent Visit the buildings user intent to visit Top view the top view of campus scene Building Viewpoints available viewpoints for the target building Tour Mode an animation tour of campus Examine Mode examine a target building 35 Help simple description for keys Quit quit the application Before user starts to carry walk or examine behavior he she needs to locate an available building as the target Then user should be able to walk around use keys defined bellow Any change of viewpoint building or mode should go through menus User can press Esc key to display hide the menu and carry the intended operation e Key functions Based on the different application state the keys are binded for different purpose For all mode Esc key for display hide menus Space key for selecting Q key for quit the application For menu mode
11. building Then in BuildingDataSet java I directly load file wedge 107 107 wrl and get all the local viewpoints Here I didn t use loader in Campus java to get viewpoints because where the viewpoint I got are all viewpoints mixed together without information of which viewpoints belong to which building Lastly I multiply the transform3d of building and transform3d of viewpoint If it happens that there is no defined viewpoint for a building I will append a default viewpoint for that building for easy access to the building 5 6 Internal database Campus java An internal database of input data is maintained after data is loaded and processed by the application The database is simply a list of BuildingDataSet each of which is the data for a specific building including buildingId building tranform3d and all available viewpoints The database is created when the application is launched In Campus java the algorithm for creating such database is like this use BuildingSearcher ojbect to get a list of all avaliable buidlings get all named objects from loaded scene as a hashtable for each building find the matched transformgroup in hashtable base on id get the transform3d from this transformgroup 24 create a BuildingDataSet object id transformgroup add this BuildingDataSet into a list 5 7 BuildingSearcher BuildingSearcher java This is used to search local data file systems to find the available buil
12. ct a specific menu item and then activate the function for that item e WalkController creates behaviors when application is at walk mode When this mode is in active the keys are binded for the purpose of moving around within the campus Eg arrow up key may used to move ahead e ExamineController creates behaviors when application is at examine mode When this mode is in active keys are binded for the purpose of examine a specific object Eg arrow up key may be used to push a building far away 5 Software implementation This part will describe some important algorithms involved and implementing issues 5 1 Menu structure SubMenu java amp Menultem java As seen in the class diagram SubMenu class is inherited from Menultem Menultem defines a single item and SubMenu contains some SubMenu and Menultems 19 Figure 6 Menu scene graph diagram A submenu itself is a branchgroup has a parent and contains sub1 sub2 item3 all as branchgroup It also has a switch which has Labell label2 label3 also as branchgroup where labels are 3d text display for subl sub2 and item3 Here sub and sub2 have same structure as subMenu When this subMenu is selected then the switch will be set to all while all subl sub2 and item3 will disable Then menu items of this submenu will be displayed If subl is selected then the switch for the subMenu will be set to none and the switch of sub will be set to all Then menu ite
13. d by the application are easier for user to access using the keyboard All the behaviors defined in the software requirements are covered and some user specified scenarios were also tested All behaviors are implemented complying with the software requirements User documentation 7 1 System Configuration 33 e Configuration The software and other deliverables are packaged into project directory The project directory contains 5 parts anu directory is the input VRML data extPackage directory is the external package used by xj3d loader tiwi directory is the wedge platform package Campus is the actual application of this project and doc directory is the javadoc API Exact the jar file into a disk drive The assumed structure is that extPackage tiwi campus and anu are in the same directory because the batch file contains the assumed class path Then the build and run batch can be used directly If structure is modified you need to explicitly specify the class path for extPackage and tiwi e Compile run Build Execute build BAT Or make clear then make build in linux or goes to Campus directory setup classpath then run javac Campus App java Run Execute run BAT or make run in linux 34 or goes to Campus directory then run java CampusApp uni data path intent visit building list eg java CampusApp anu 105 12 5 csit Here the uni d
14. ded to user The help information shall include keys functions description Help information shall be able to hide display User shall be able to view a building He can choose the ID of a specific building and the system shall display the 3d scene at the default viewpoint The available building IDs in the menu should be created dynamically 9 3 2 8 3 2 9 3 2 10 3 2 11 3 2 12 3 2 13 3 2 14 3 2 15 from the data of local data system If local data system has the data for a specific building then the building ID shall be accessible through the menu The available building viewpoints shall be the viewpoints for currently selected building When user selects another building the available viewpoints shall be updated User shall be able to switch between different viewpoints and the transition between viewpoints should be smooth not directly or sudden switching User shall be able to switch between different application modes through menu items The different modes should be easy to access at any time User shall be able to walk around in the virtual campus User shall be able to move to the left right and walk ahead back User shall be able to turn left right User shall be able to look up down User shall be able to examine a building When a building is selected user shall be able to rotate the building using the domino or keyboard The application shall provide some animation tour to guid
15. dings and then return a list of building ids Here we assume that for every building a directory named as building id will be used to hold all the data information Eg if we have building 107 there must be a directory 107 existing under wedge directory So here I search through all directories under wedge and I will have all the available buildings 5 8 Viewpoint switch When user is exploring the virtual campus and selects a specific building then user s view needs to be transferred to that building This could be interpreted as switch the current viewpoint to the viewpoint of that building Here I simply set the targetTG which represents the user s view to the target viewpoint While sudden transition will involved and may make user confusing a more nature way called smooth transition will be employed to improve such viewpoint switching 5 9 Smooth transition Campus java Smooth transition is defined as smoothly translate view targetTG from current viewpoint to a target viewpoint To provide user with a more nature virtual experience smooth transition between 25 viewpoints becomes a fundamental requirement To achieve this function the RotPosPathInterpolator is used Algorithm is like this Define an alpha Set start time to current time Create AxisAngle4f object as identity Define two knots O for current viewpoint and 1 for target Get Matrix4d from current targetTG and set as quats 0 Get positio
16. e billboard and LOD still needs to be solved e GIS details The VRML data is defined to comply with GIS standard This wedge application 38 shall be able to access more details of the campus therefore provides a more real and nature virtual world to the user e User defined tour The tour is an interesting feature of this application The future version can provide function for user to define the tour route places and speed and so on For a user first time plays with the virtual campus the tour will make him her much easier to explore the virtual world e Smooth transition Currently the transition between two viewpoints is defined through two knots and thus may goes through some buildings A more realistic way to implement such transition is to define a third knot which makes the transition not go through any buildings The knot could be some where above the building or somewhere computed in the space between buildings e Usability Usability is an important feature for a well designed software application For example the color problem I mentioned previously will bring usability problems And some of the menus and user interaction may not be well designed A usability study could be carried and thus improve the usability of this software Acknowledgement I would like to thank the following people Pascal Vuylsteker my supervisor James Sheridan for help with menu code and configuration of wedge 39
17. e user flying around the campus 10 4 Design Description 4 1 Design method The design will be traditional design This includes requirements modeling software design software implementation and software test 4 2 Data description The data information of the system will be modeled to comply with GIS Global Information System standard In this project the campus will be modeled in VRML language and the data for each building will be modeled as GIS system and grouped into different level of details Here is the definition of GIS level of details used by the input VRML data LODO The basic information of a building including the ID name description location shape and etc Normally they are stored in a single html file The system will output this HTML file according building information and other higher level VRML model will anchor a link to such HTML file LOD1 In this level we use a bounding box to denote the building the shape for this bounding box usually is a rectangle In the VRML model we will use a billboard with a texture to denote this bounding box The character for the billboard is that the content always faces the user and rotates around a specified axis LOD2 In this level we can use more detail shape to denote the building in a simple VRML 3D model the shape includes rectangle cycle and polygon and for 11 each side user can add different texture LOD3 At this lev
18. ects and so on will be returned BuildingSearcher class for searching local data directory wedge find all the available building IDs Then a linkedlist of these building IDs will be returned This list will be used to check against user intent visit buildings see if the intent visit buildings are available Campus class for combining all things together This class will use several of other classes to add buildings menus behaviors to extract and maintain an internal database which is the dataset of all available building data GroundPlane class for creating green ground which is surrounding the campus map Menultem class for defining a single item and this is also a super class for subMenu SubMenu class for defining a sub menu which may have multiple menuitems and submenus as children Menu3D class for creating the whole menus combines submenus and menuitems together The menu will have some static menu items which are created when this Menu3D object is created and some dynamic menu items which are created at run time based on the different application status KeyState class for modeling application status The status includes menu state walk state examine state and tour state Keys will be binded with different behaviors depending on the status 18 e MenuController creates behaviors when application is at menu state The behaviors are created for user to explore different levels of menu to sele
19. el user can save and input external high level of detail VRML 3D model to the Campus3D system and can save more pictures about the outside of building LOD4 Including LOD3 data and the pictures about the inside of building The higher the level of detail is the more realistic the 3D model for the buildings and the 3D scene for the campus will be With such 3D model data the user can easily form the understanding of the terrain of the campus The levels of detail that contains 3D models can also be placed into a single 3D model scene In this way different distance between the view point and the 3D scene will lead to different 3D models displayed in the 3D space The application itself will not include any such data However some demo VRML data will be used to test and demonstrate the application 12 4 3 GUI design Building 1 5 Building 1 30 Building 6 10 Building 31 60 Building 11 15 Building 61 90 Building 16 20 Building 91 120 Building 21 25 Building 121 150 Building 26 30 Building 2 WALK Building 50 Building 5 Intent Visit Buiding 120 Campus Viewpoint Building Viewpoint Tour Examine Top view 1 Side view2 Help Exit NtoS East to West Figure2 menu system diagram Bold box dynamic menu items which changes depending on the application status Normal box static menu items which doesn t change Menu is the main user interface User should be able to use k
20. ems Menu3D java Some menu items needs to be created at run time such as available buildings and available viewpoints for a specific building When implementing the program available buildings are unknown and only known after the software processes the data For the available viewpoints menu item when another building is selected all viewpoint items need to be updated Here in my implementation only menu items are dynamic and submenus are static All submenus which will contain those dynamic items are created at start up and then placed into menu system After processing the data available buildings will be categorized into appropriated submenu Most building id will be an integer eg building 107 then it will be compared with the building range and place into submenu building 106 110 For those building Id ended with A or B like building 107B then the comparison algorithm would be a bit different B will subtract from the string first and then make the comparison For those building id with text I put them into another group called Building with text ID For the available viewpoints When another building is selected previous viewpoints will be cleaned Then based on selected building id application will search through internal building database details will be discussed later and get 22 all matched viewpoints generating viewpoint menu items 5 4 Intent visit buildings Menu3D java User may la
21. eyboard or domino to explore the menu items and access the functions provided by the application Menu items of bold box in figure2 are dynamic The application reads the data information from the local file system extracts the relevant data and then generates the menu items The items depend on the current status of application and the target building 13 4 4 Domain diagram CampusApp BEHAVIOR Figure 3 domain diagram e CampusApp This is the main program which receives user command line arguments and then starts the application e GEO domain The main purpose of this domain is to load the scene of the campus This domain needs to search local data system and find the building VRML data and load them into the application GEO domain also needs to extract data required by GUI such as building Ids viewpoints for each building and make them accessible It also needs to created the behavior objects and bind them to different state e GUI domain This domain is responsible for creating the graphical user interface which are the 14 menu items GUI domain needs to request data from GEO domain dynamically generates some menu items When the current status of application changes the menu items need to be updated GUI domain needs to bind the functions of the application to the menu items e Behavior domain This domain needs to deal with application behaviors which correspond with the user input
22. eyboard will be used as the input devices for this application Users can use either of the devices to interact with the wedge system A pair of special 3d glasses will be fitted and user shall be able to use such glasses to view the virtual 3d campus Head tracker and 3d mouse may not be implemented in the initial version In the future versions these two devices could be implemented to provide user a more realistic virtual experience 2 1 3 Software interface The application shall load the virtual campus data from the local file system An appropriate loader would be the interface between the application and VRML data The TIWI package is the interface between the application and wedge system TIWI is the platform developed by eScience department for creating wedge applications 2 2 High level functions 2 2 1 Load existing virtual campus data and display it to the user The starting scene shall be the campus street map from the top view 2 2 2 User can locate a building from the campus street map and look at the 5 building at pre defined viewpoints 2 2 3 User shall be able to walk around in the virtual campus using the domino or keyboard User shall be able to move ahead back move left right look up down and turn left right The scene displayed to the user through the wedge shall be nature and similar to the real environment Furthermore user shall be able to examine a target building in the virtual
23. hree are modeled KeyState is used to model the application state The application is started as menu state and then goes to different states The walk state can not go to examine directly and needs to go through menu then examine At state of walk or examine ESC key could call back the 3d menu thus changes to menu state One more ESC will hide the menu and go back to the previous state Software testing As this project is developed by one person only unit test and system test are executed 30 6 1 Unit test Unit is the test of the single unit of code The unit could be a single method function or a class This kind of test is done together with the application implementation 6 2 System test System test is that all software application external package and hardware being tested together e Platform pc with windows linux The software application is tested on different platform home pc with windows lab pc with linux and the wedge system The software could be run at both windows and linux platform I did both batch and make file for compile and run the application And the scenes presented to the user are identical 31 Figure9 Shot of the scene This is the screen shot of scene running at windows platform It is a top view of the campus The software is implemented with two screens as default it works well with the pc with one screen monitor All the behaviors of walk menu examine and
24. idden displayed Events for 2 2 2 User selects a building The menu will be hidden This None through levels of building displays from the submenu pre defined viewpoint User selects another User will be transformed to None building this selected building in a smooth transition way User select Building Viewpoint menu Pre defined viewpoints for selected building are available as menu items Viewpoints are pre defined in the building vrml file User select a building viewpoint The viewing camera is switched to the selected viewpoint This will be a smooth transition Viewpoints available User select another The viewing camera is Campus viewpoint campus viewpoint switched to the selected available viewpoint Events for 2 2 3 User press left right User moves to the left right Application in the arrow key This is Doom like behavior walk mode and the viewing camera moves to the left right The orientation doesn t change User press up down arrow key User moves ahead back This is Doom like behavior and user feels like walk ahead back Application in the walk mode User press page up down This is like user looks Application in walk keys up down mode User press L R keys User feels like turns left right Application in walk The viewing camera is rotated mode to the left right User select Examine
25. ms of sub will be displayed and items of submenu will be disabled 20 5 2 Exploring Menus Menu3D java amp SubMenu java In Menu3D a private variable called current is used to keep the current SubMenu object The root menu is a SubMenu with null parent so at start up current references to root menu Each SubMenu object contains a variable highlighted_item_num which means which item is selected currently Therefore current keeps submenu information highlighted_item_num which item is selected keeps in this submenu So current menu item at any time is determined by the both variables Methods for SubMenu java Method up When a user uses arrow up key to goes up application just makes variable highlighted_item_num 1 Method down If goes down just highlighted item num I Methods for Menu3D java Method left When a user uses arrow left key to goes to parent menu just sets current to the parent SubMenu Method right sets current to highlighted_item_num item if it is a submenu otherwise select this menuitem Furthermore the root menu is placed into the 3d scene graph as a branchgroup Regardless of wherever the user stays in the virtual 3d world the display of menu 21 should be identical and distance between user and menu should same all the time Thus I set the menu as viewpingplatform geometry Then user should be able to see the same menu wherever he she stays 5 3 Dynamic menu it
26. n x y z from current targetTG and set as position 0 Get Matrix4d from target viewpoint and set as quats 1 Get position x y z from target viewpoint and set as position 1 Create RotPosPathInterpolator object with above information and targetTG and attach it to the wedge Then the targetTG will be smoothly translated to the target viewpoint But this also introduces a small problem When user is successfully switched to the target viewpoint if he she wants to move around he she will be brought back to the starting viewpoint This is because the Transform3D of targetTG in the behavior object is not updated When user uses the behavior object to move around the old version of transform3D applies To solve this problem the tranform3D in behavior object needs to be updated But you can not update this directly after the smooth transition procedure because the Interpolator creates another thread to execute the animation the update will be executed before animation finishes Therefore the displayed frames would be like 26 this current viewpoint first then suddenly target viewpoint while animation running at the same time Lastly continue and finish the animation Frames will be overlapped In the implementation I put the update method into the behavior object for the key strokes after the animation finishes Then the tranform3D will be updated before any user input behavior 5 10 Tour animation The tour is defined a
27. s an animation which guides the user around some specific places In the implementation I just developed some demo tour without any interface provided for user to define such kind of tour The tour algorithm is similar to that of smooth transition For demo tour E W I defined 4 knots current viewpoint a viewpoint in the east of campus a viewpoint in the west and last back to the starting viewpoint The other demo tour N S is similar 5 11 Walk controller WalkController java The algorithm for walk behavior is from the Computer Graphics tutorial from Pascal Vuylsteker The algorithm is like this For movement Define t3dVals as Matrix4d then viewT3D get t3dVals 27 double xpos t3dVals getElement 0 3 double ypos t3dVals getElement 1 3 double zpos t3dVals getElement 2 3 double ix t3dVals getElement 0 0 double iy t3dVals getElement 1 0 double iz t3dVals getElement 2 0 double jx t3dVals getElement 0 1 double jy t3dVals getElement 1 1 double jz t3dVals getElement 2 1 double kx t3dVals getElement 0 2 double ky t3dVals getElement 1 2 double kz t3dVals getElement 2 2 xpos dx ix dy jx dz kx ypos dx iy dy jy dz ky zpos dx iz dy jz dz kz t3dVals setElement 0 3 xpos t3dVals setElement 1 3 ypos t3dVals setElement 2 3 zpos viewT3D set t3d Vals For yaw an angle rotateT3D rotY da viewT3D mul rotateT3D 28
28. stem render it and display to the user in the wedge Through the functions provided by the software users shall be able to explore the virtual campus 1 2 Project Management Timetable Week Dates Notes 1 21 27 Feb Chose a supervisor client subiect and Get started 2 4 28Feb 20March Details of requirements 5 6 21 3 April Modelina and Learnina of Chosen Technics Phase 7 8 4 17 April Implementation 9 18 24 April Mid proiect result prototype report draft first implementation due 10 25 1 Mav Comments by supervisors 11 2 8 Mav Implementation of Comments 1213 9 22 Mav Debuaaina amp Documentation Week Dates Notes 14 15 23Mav 5June aa Ch completed 16 6 12 June Proiect presentation 17 18 20 24 June Final Reports due at 4 00 pm on Friday 24nd of June A timetable is well defined at the starting phase of the project and the timetable will be used to manage and control the project development process 2 Overall Description 2 1 Product perspective 2 1 1 Context diagram Virtual campus User operation f Selection of Request operation for data Local File System Figure1 context diagram 2 1 2 User interface The menus will be the main interface for user to interact with the VACIW The available operations at specific stage for exploring the virtual campus will be provided through the menus Users are able to display or hide menus at any time The domino or k
29. unch the software with some specific buildings he she wishes to see These command line arguments will then be processed and thus the related options will be provided as menu items Before those menu items could be displayed application needs to check if these buildings are available by the input data Method addPreVisitItems This method gets the building argument list then compare with the list of available building list Only menu items of matched buildings will be created 5 5 Viewpoint BuildingDataSet java amp Campus java From the pre analysis of the input data the viewpoint information of a specific building is separated into two parts one is the transformgroup of this building and the other is the tranformgroup of viewpoint relative to the building Therefore the viewpoint information is locally and can not be applied into the whole scene directly The viewpoints provided by the Xj3D loader which loads the input campus data are simply the relative viewpoints Thus we need to process and get the absolute transform group of the viewpoints The solution is to multiply Transform3D of building and Transform3D of viewpoints In Campus java I try to get the Transform3D of a specific building when I use 23 ObjectScene to load the campus data scene wrl Since every building TransformGroup in VRML file has a unique name TM Building id eg TM Building 107 I use interface getNamedObject to get the transform3d of this
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