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

Figure12:Filteringoperationwindow.

Theinterfaceobjectthatrepresentstheconcatenationoperationwasdesignedtoprovideagoodvisualperceptionofthecompositionasawhole.

ThemotionsselectedbytheuserintheScratchPadaredroppedintotheCon-catenationWindow.Initially,theyarepositionedinsuchawaytoperformadirectconcatenation(i.e.,withoutblendinginterval),asshowninFigure

13.

Figure13:Concatenationoperationwindow(initialmotionarrangement).

Usingtheexistingtoolsformotionpositioningandreparametrization,theusercande neblendingintervalsthatwillpermitasmoothtransitionbetweenthecombinedmotions(inFigure14,representedbythedarkerregionsbetweenmotions).

However,someinterfaceconstraintswerecreatedtoavoidundesirableresults.Theseconstraintsensurevisualcoherence,andguidetheuserintheoperationprocess.