Tutorial 2 Data Visualization
Contents
1. BE JAA Corners mm ZZ Za Z E BS Z l A Ee JE 53 21983 1243 358 0 105747 Lian za zz E em z La a ES bone Include Cal Matrix only applied for E RG A HA E Ez ES P KS KE type 4 5 and 6 platforms Lon De ee en et lr en lee ess ss N BI An IMPORTANT CHANGE was made to this dialog in Visual3D Version 3 07 First a TYPE 5 Force Platform has been introduced for AMTI s portable force platform with 8 analog channels In Version 3 23 a TYPE 6 Force Platform has been introduced for force platforms with 12 analog channels Second the order of the CalMatrix edit boxes was changed to be more conceptual The matrix is specified to reflect the calculation of the analog scaling CalM atrix 4nalog S caled Analog A change was made only in the presentation of the edit boxes No change was made to the C3D Parameters LI gt 3 w e Dei LLLLL RRRRRR 2 Click on the Get Current C3D Parameters button to populate the dialog box The Force Platform Zero Baseline Interval indicates that the first 10 frames of data will be averaged to define a baseline which is then subtracted from every frame of data The ORIGIN mm shows a 21 mm Z component The manufacturer manual will show a positive z component The c3d format assumes that this value will be a vector from the ORIGIN to the center of the top surface of the platform in the force platform coordinate system which means that the value in the C3D file should be negative2. NOTE For multiple selections hold down the CTRL key while you select files The 3D Animation Viewer should now display a skeleton of the lower body that has been associated with your movement data You can animate the skeleton by selecting the PLAY button NOTE If you do not see the skeletal structure click on the View Segments icon If you still do not see the skeleton the directory containing the animation models may not be set correctly Check the paths near the bottom left of the Workspace Tab 2 oi The 3D Animation Viewer Once you have assigned a motion file to a model Visual3D creates a new folder KINETIC_KINEMATIC in the Data Tree of Signal and Events Processing mode This folder contains basic kinematic and kinetic data for the trial This information is actually intermediate data and the user should create Model Based Data rather than analyze this data see Tutorial5 For more information on the types of FOLDERS and their contents please see the online reference documentation modeling sample cmo Visual3D L Tell File View Model Pipeline Properties Help La A CAT w C C MotiontuserManualsStutorials tutorial24W alkina Trial 1 c JH Be Model Building E Reporting KR lt 00 i orkspace Status pr Signal and Evert Processing Tk Real Time Capture j TARGET CJ ANALOG GRFORCE 3 COFP j FREEMOMENT Ho eee See ee OOMOMOOOOO L j HEADER INFORMATION j PAR
3. Close the graph by clicking on the X in the top right hand corner of the graph To display a signal graph Signal graphs different from signal data graphs in QuickView are interactive and offer different viewing options of the data Signal graphs appear on the right side of the screen and can be used to visualize or add event labels 1 Right click the target file in the ORIGINAL file e g RTF1 2 Select Graph X Y and Z and select New Graph A set of graphs will open on the right side of the screen NOTE Use the Add to Existing option to add new signals to an existing graph tutorial 2 cmo isual3D 0 x File View Model Pipeline Properties Help D Geb E lta BRE Watking Trial 1 034 JH ER og Workspace Status ke Signal and Event Processing E Model Building SS Reporting gt IL ORIGINAL Can Oe RF Graphx O6 RF Graphy OS LFT Graphz Oe tt OS LFT Remove All Graphs E PO Ganeta Matric y vo de Man Colo to ona no no 4 x 4 amp x 3 5 S Real Time skips frames e Draw Every Frame siower O E Current Frame ES 131 Loop Bi Direct 3 ss Bu 1x Zu 3x de 5x H Tam oe 3 jpooooon bi Hd n su pas 4 For Help F 3 Place the mouse on any point of the line on any graph and click This will display information about that point or event To format and animate a signal graph 1 In the View menu click on Vie
4. Corner 1 Corner 2 Corner 3 and Corner 4 are the locations of the force platform corners specified in the laboratory coordinate system This information is used to 12 transform the signals from the force platform coordinate system to the laboratory coordinate system In principle the force platform can be located in any orientation in the 3D data collection volume e g the force platform does not have to be on the floor The Analog Channels column shows the analog channel assignment number in the order the ANALOG channels appear in the c3d file 3 Click Done or Cancel when finished examining data Thresholding the force platform signals in Visual3D When force platform data exists Visual3D attempts to assign the signal to a segment that comes into contact with it If there is a low level of background noise in the signal it will appear that something must be in contact with the force platform at all times To ensure that only sensible real contacts are used a threshold values is specified such that any ground reaction force signal below this value is assumed to be zero This ensures clean contacts with the force platform 1 Select the Properties menu 2 Click on the Modify Minimum Force Platform Value A dialog box will open to allow you to set a higher or lower threshold than the default Properties Help Enter the minimum gravitational direction value you would like to use for the force Modify 3D Viewer Mouse Sen
5. M Show Legend T Steen Peti ke Show Basel ke E Sech to AN Selected Tes Sane these zeiten ac the dell Reme a Graph Save Graph Layout Load Graph Layout 3 To format the signal graph right click anywhere on the graph to open an options menu Select Format Graph Enter your desired changes and click Apply 10 Force Platform Data Force Platforms provide critical data for biomechanical analysis because they measure the interaction between the subject and the environment If the subject is in contact with the floor the joint forces moments and powers have no physical meaning unless the reaction force data are included in the analysis NOTE The Analog signals that are collected from the force platform are NOT the force signals The force signals must be computed from these Analog signals using several parameters that specify the type of computations required different force platforms require different computations For information about force platforms see the c3d file format manual stored at www c3d org or the Visual3D online reference documents To create graphs of a force plate signal 1 If the graph area at the right is still occupied right click anywhere on the graph area and select Remove all graphs 2 In the Data Tree select the ANALOG folder then ORI GI NAL Right click FZ1 select Graph Z and New Graph This will open a graph of the Fz ANALOG channel of force platform1 3 In the Data Tree se
6. To activate the animation click on the arrowhead PLAY button at the bottom of the screen The marker figure should walk across the screen However no 3D form will appear modeling sample cmo Yisual3D loj x File View Model Pipeline Properties Help D S E E 68 BRS Walking Trial 1 634 _ la iit M W ER Twy Si ikspace Status H Signal and Event Processing FR Model Building ZE Reporting J TARGET J ANALOG 1 GRFORCE EUR _j FREEMOMENT HEADER INFORMATION J PARAMETERS O SHm O SU SU O d C Real Time skips frames Q Al TH uM popr 20 Draw Every Frame slower Current Frame fi 45 fi 31 Loop BiDirect E ES F ta lt i gt i gt am gag N ir Help press F1 2 In the Model menu select Assign Model to Motion Files A dialog box will open Select the Lower body Static Trial c3d file and the Walking Trial 1 c3d file and click modeling sample cmo isual3D l Ioj x File View Model Pipeline Properties Help O l Create Add Static Calibration File gt sr Compute Model Based Data ez OQ C S gal a SEH Modry Frame Ra libret C5 n Models to Motion Data x Edit Landmarks uS Workzt Select a model Lower Body Static Trial c3d Delete Selected Model Select trials to use with this model ctrl click to select deselect motion data Color Item with Signal alu
7. 28 f na w m I PICO H VISUAL3D Tutorial 2 Data Visualization Revision 3 30 C Motion Inc 15821 A Crabbs Branch Way Rockville MD 20855 USA 301 840 1919 phone 301 840 0271 fax Support c motion com Table of Contents How to Use the Visual3D Tutorials 3 To legen ere e in LEE 3 OD CctiVes OF TUCO AAA AA A 3 Preparado Tor TUtO Ha EE 3 LOadINg ENE Fleitas dada cada E 3 Associating Movement Trials and Model Fies nr rr rr 4 The 3DAnimation VIS Wed 6 To FEA AME a Mal Kel Jabel ii AAA AAA AS 6 To exporta corrected cs da Te ODUIONGL sui rodante aloe 7 Beleeg 8 TOTO cUS O BONES CO Men Es nr doo A des podes 8 Animation Controls pan ZOOM TIE ODUONS arcano rota basado 8 EXPONE VOUP Data ASA ANO a Tf TJT3 1 How to Use the Visual3D Tutorials There are four tutorials covering 1 Building a Model 2 Data Visualization 3 The Command Processing Pipeline 4 Signal and Event Processing 5 Analysis and Reporting Each tutorial starts where the previous one ends The results of each tutorial are automatically saved as a cmo file So you can skip parts or try different features To locate sample input files All the sample input files you will need for this tutorial can be downloaded from the C Motion website http www c motion com support tutorials htm Objectives of Tutorial 2 This tutorial assumes that Visual3D has been installed and that a model has been created as described in Tu
8. AMETERS Real Time skips frames Draw Every Frame slower FEU Tam pepr opie Current Frame 1 49 131 Loop Bi Direct Au lx dy Se de Pn pa 1 ore ote mer po No Target selected For Help pri wc oa r c v v v7o ooo v f rmv r r o o rVv v oror rc wvovovV o v vo0ovoeorb v c oV OO Simple errors in the labeling of markers in the data files may become apparent at this stage For example the missing right foot segment in the above figure In this example the RFT1 marker was accidentally labeled RFT1A when the marker was identified in the data collection program These types of errors can be corrected in Visual3D To rename a marker label 1 Click on the TARGET folder to open the inner folders Then click on the ORI Gl NAL folder This will open the original data file 2 Right click on RFT1A the erroneous marker label to open an options box 3 Select Rename Label and enter a new target RFT1 You can add a description as well optional Click OK 4 The data file has now been corrected However the Workspace has not been updated so the segment will not appear Select the RECALC button on the toolbar or switch to Model Builder mode and select Build Model The 3D figure will now have the missing foot modelino sample omo Saa el x Ela Weu Model Pipeline Properties Help New IN fa pr Crecd ckt hh y doss bino IR Model nukan
9. and Evert Processing RN Model Biei EN Fleposing Model Cba abr Files Lsap Been babe 1 nd e AA ES Los Fils Repon Pages r gt Deag Caro Pap Folge gt gt gt E et sen F schen ul 30 Bali Pech Segment Geapshecs Falder JO Preg Fiscal 30 Detaiogele Se Plepositony JO Progra Fier Visual 30 Baca Fer Hola press FI 3 From the File menu select Open and select the downloaded file Walking Trial 1 c3d 4 Select Add the new files to your currently open files and click OK Rc Z E Els Yew Model Decke Properties Het Ci c EU IINE J HE Workspace Stanat EE Signal and Event Processing RN Model Duiding DEl Peporing Models T abba acn Fier Her Fiet talking Tod cd Loss Body Static Tialc 3d lies Already Oper These ic besch a fle open in thet Visual rod ipaca oe sed paia Re Los Putre Ear reia lea C Doze al open files before loading ihe rasa Bez Associating Movement Trials and Model Files Visual3D saves the Walking Trial 1 file in the Motion Files column but not directly beside the static trial file 1 Click on the Signal and Event Processing Tab The viewing area will open At this point the file has not be associated or mapped to the model In the viewing area only the markers will be animated NOTE If no image appears verify that the filename Walking Trail 1 c3d appears in the file name box instead of ALL FILES
10. animation before proceeding To focus on one segment 1 Right click a segment of the 3D figure to select that segment eg SLK A list of segment options will open 2 Select Track Segment Center of Mass with Camera An animation will open which keeps the selected segment centered on the screen EE m C TARGET O 9R161MAL O mT Oe nrt Cle ara O FT Oe ue Deum Lef Axi d g Os assi le nsa O ki O L E LEI z i EE HE De nm Map Segment Color Le a Berl Valve Oe ate 0 ano Track Samen Cerber of Macs wath Camera Oe ates Roto jScale Segment Graphic Model Dem A Man ks De ine wf Views Laria est Wee Model Center of Mass Oe ms Verse Segments D U sete s Wee Force Pain C LANDMARE Q UMETIC_EMEMATE Vim Lab Ames 5 HEADER MEDIADA TION e Ss Tees o Ce KE ES fi 5a lx Ze he de Se 18 A ec Randy 3 De select this option before continuing Right click on the segment then remove the checkmark Note That the camera orientation relative to the segment can be modified Under the View Menu select Set Camera Perspective Orient the camera looking at the Laboratory Origin e g at the x y z axes that are drawn this will orient the camera relative to the laboratory Select Save Current Segment Perspective Now you can select Move Camera to Track Segment and the camera orientation will follow the selected segment rather than the laboratory orign Animation Controls pan zoom tilt option
11. d incorrectly by the motion capture software The scale factor will need to be changed see later section Modifying the Force Platform Parameters in the C3D File Force Platform data are perhaps the most confusing aspects of the C3D file format All of the required Force Platform parameters for the type of Force Platform must be defined correctly Some of the parameters are specified by the Force Platform manufacturer these values are provided in the Manufacturers User Manual Note that some of these parameters can not be transferred directly in the C3D file The C3D format assumes consistency between units throughout the file If the Motion Capture data has been collected in millimeters ALL distance measures in the file must be consistent This means that the corner locations and Force Platform ORIGIN values must be in millimeters and the moment channels of the force platform must be expressed in Newton millimeters To examine or modify the parameters 1 In the File menu select Modify Force Platform Parameters Modify Force Platform Parameters Select Force Platform to Modify Add an Additional Force Platform Delete Selected Force Platform Get Current C3D Parameters Force Platform Zero Baseline Interval 11 10 Update C3D File l Delete all Calibration Matrices if prese ce a OS Calibration Matrix Type 4 6x6 and Type 5 6x8 force platforms Force AE Type TYPE hz Nu TC ES Iz bay fan y Ez Lz EE TJ YAA NANA s ca rl
12. g ill Reporting E Cores Erre As A Modify Ponca Platform Parsinabirs Sarte y Fis Lage Add Madly yeechronced Vid o Ples ack Mody Synchronized Motion Files Append Report Template E Save Report Template Ciber Export Animation frame bo EMP heri j 7 Boal Tenc ps ha De ed Frei y Des Every Frame loser Cis ANALOG Caner Frat L NEE F fez bz ie Bimal ft A E J e a SM Ss Lal Lm Le fi PERS s icimi cee gt r F o To export a corrected c3d file optional 1 In the File menu select Export C3D File Export C3D File File to Export CACM otion user anuales tutorials tutorial walking Trial 1 c New File Name CACM otion userh annuals stutorials tutorial all Select Old 4 78 Character Event Labels ln Header to Export Processed Data Endian MAR k 4 Character Labels Truncate Parameters Section Export Old 4 19 Character Event Labels in Header Number Of Frames To Export ALL Export Cancel 2 A dialog box will open Select Walking Trial 1 c3d 3 Select the filename to be exported It is permissible to overwrite the existing file 4 Leave all other options at the default values Many of these options are available to handle quirks in the c3d file format and should only be used when necessary 5 Select Export Changing Views You can reset the camera perspective to lock onto a segment and keep it centered on the screen You may want to stop the
13. lect the GRFORCE folder FP1 Z component and New Graph This will open a graph of Z component of the Ground Reaction Force signal Note that the two signals are related to each other but they are not identical The ANALOG signal is stored in the coordinate system of the force platform The GRFORCE signal is stored in the Laboratory Motion Capture Coordinate System modeling sample cmo Visual3D File View Model Pipeline Properties Help D ws G LA D C C Motion userM anuals tutorials tutorial2 W alking Trial 1 c Y Event OB uq space Siche Ne Sie aLand Fvent Procession FRA a uilinn SS D apo JA Deg be _ em O Fx LBE FZ1 O MXi O My O 21 Co CH7 CO CH8 QO Fx2 O Fr O F22 LI Mx2 LI MY2 O Mz2 CL EMG9 O EM O gt EMG1 O EMG2 O gt EMG3 O EMG4 O EMG5 CL EMG6 CL EMG O EMG8 TL GRFORCE A OZ ORIGINAL FP1 ls FP2 2 611 O core PT FREEMOMENT 17 5 SIGNAL 419 8 822 0 0 0 1 3 790 1 395 1 FilFiTam popo ie Sc r ff to Da 1x EI KT R rm p 1 0 0 No Target selected NOTE We often get questions from users claiming that the ANALOG signals for the force platform exist but the GRFORCE signal is zero Check to see that the Fz Channel of the ANALOG signals is negative If not then the ANALOG scale factor in the C3D file has probably been store
14. s The camera orientation is controlled using the mouse This was described in Tutorial 1 but here is a summary Hold the mouse button down as you move the mouse across the viewing area Left mouse button rotation Right mouse button or scroll zoom Middle or both buttons translate Visual3D Tutorial 2 October 2005 Exploring Your Data Data exploration is a key aspect of attempting to ensure that the original data has been recorded correctly To create a QuickView of Data You can use a QuickView Signal Graph to display targets or analog data You can use Quickview to help plan for interpolating missing data or using low or high pass filters to eliminate excessive noise from signals From the Quickview screen you can also export a single signal file to an ASCII file 1 Click on the TARGET file to open the inner files and then click on ORI GI NAL to open the original data Click left click on the desired file e g RTF1 2 Select the Signal Quickview tab to view analog graphs A Quickview can help you to locate obviously incorrect or noisy data 3 Select Signal Data to see raw data or to export to an ASCII file lt ex Al modeling sample cmo Visual3D File View Model Pipeline Properties Help FIFE De ta cetonas io Vu LIHE os Data View Data View 1 00 CAC MotionvwuserManuale tutorials tutorial Walking Trial 1 c3d TARGET RFT3
15. sitivity platform Modify Lab Coordinate System NOTE New values are only applied to the currently active file s and may be Modify Size of the Displayed Target selected for the default value for newly opened motion files Modify Trajectory Trail Lengths d Modify Vertical Height of Objects on FP Default Force Platform Minimum Threshold 20 000000 Current Minimum 20 000 Use correct FORCE_PLATFORM ORIGIN vector Modify FP Center Of Pressure distance to segment New Minimum 20 Modify Minimum Force Platform Value IV Make delos ls ders dt v Use Processed Targets for Model Segment LinkModelBased items 3 You can also choose one of the other options for modifying force platforms Select Modify FP Center of Pressure Distance to Segment to specify a minimum distance 2m default This option allows you to verify that a particular signal has been caused by a segment 2K K OK OK K K OK OK K OK OK OK OK OK OK OK OK Xx X You have now successfully completed Tutorial 2 Save the Workspace as Tutorial2 cmo Tutorial 3 will show you the Command Processing Pipeline
16. torial 1 Tutorial 2 has three objectives 1 exploring the content of the C3D data files 2 assigning a c3d movement data file to a model 3 description of force platform parameters The file Tutorial2 cmo contains the results of this tutorial You need at least two input files to perform an analysis a standing calibration file of the subject and a movement trial These files must be saved in c3d format for use with this program Most motion capture systems can save data in this form Otherwise use C Motion s file converters Check our website for details Preparing for Tutorial 2 1 Create the sample model model sample cmo in Tuturial 1 OR download the finished version from the C Motion website http www c motion com support tutorials htm 2 Download the movement trial file Walking Trial 1 c3d 3 Save the file where you would normally save motion capture files NOTE The activities in this tutorial will not alter the data in these files Visual3D copies the data into the workspace Even in the workspace the original data is maintained for recalculation purposes Loading the Files 1 Open an empty Visual3D workspace 2 Open the model from Tutorial 1 From the File Visual3D Getting Started Guide The workspace status screen will show the model with no corresponding motion file FA modeling sample oman Visual 30 Die Ye Be Pepe Propertie Leo Osa eee 33 BE workspace Status Lor Signal
17. w Graph Animation Frame Line This will create a line on the graph to correspond to a point in an animation Then click PLAY in the VCR control panel to activate the animation The vertical line on the signal graph will move along with the 3D figure 2 In the View menu try these other viewing options View Lab View Trail of Segment Target Paths View GRF Butterfly and View White Background DI ORIGINAL FEN AFTI 0 46 IR Toolbar w Status Bar Y View Force Platforms View Ground Reaction Force Butterfly v View Ground Reaction Force Vector v View Joints View Lab v View Lab Axes v View Landmarks View Model Center of Mass view Muscles J View SCS Axes at Segment Center of Mass L v View Segments FS 1 4 v View Segment Colorizations d View Segment Coordinate System Axes Fs View Segment Geometry EZ View Segment Lines Stick Figure v View Targets F6 v View Trail of Center of Mass Path View Trail of Segment Paths View Trail of Target Paths View White Background in 3D View 0 40 0 0 Ve 26 Walking Trial 1 c3d RFT1 Frame 82 Time 1 620 Signal 1 614 2 6 X Pode Conta Anh Control v View Graph Animation Frame Line v View Synchronized Video Set Camera Perspective Graph Formal Erop 5 gt inde Modify X vs Scale V Modi Aen Scale Min Y Mig E Gen Ma F Ad to use Selection Orde FP Dra and Y Suz propa bo und lenge Long Filenames E Show Ged gt H Gjidineg C Rz
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