Abstract. This paper proposes a new user interface paradigm for motion capture based animation systems, providing intuitive and efficient ways to visualize the main motion capture concepts and operations. A prototype system was built, implementing the prop

PlaybackControls

Followingthepost-productionvideointerface,wedevelopedacontrolpanel,whichallowsinteractivecontrolofanimationsinoursystem(Figure

17).

Figure17:Playbackandrenderingwindows.

TheplaybackofmotionsorcompositionsproduceduserareexecutedinadedicatedOpenGLrenderingwindow(inFigure17,Thecontrolpanelisintegratedwithit(inFigure17,),supplyingasetofcontrolssimilartothoseusedinvideorecorders.

ObjectsforOtherAnimationTools

Asdiscussedbefore,thearchitectureusedinthesystemallowstheintegrationofotheranimationtechniqueslikekeyframing,forwardandinversekinematicstohelpintheprocessingofcapturedmotions.

Inthecurrentimplementation,thesystemusesforwardkinematicsasanauxil-iarytooltoadjustthepositionofspeci cjointswhennecessary.Theadditionofkeyframingandinversekinematictoolsisplannedforfutureimplementations.

3.5ImplementationIssues

ThepresentedinterfaceparadigmandprototypesystemwereimplementedintheprogramminglanguageC,usingaSGIIndigo2graphicworkstationasthebaseplatform.WeemployedOpenGL[14]forrenderingandXForms[13]for