【正文】 ows: Motion Representation MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 Parameterizing Rotations ? Goal: encode rotations in a vector 187。 actor should have similar proportions as the performer ? joint rotations of the actor are applied to the character ? there are still issues with proportions Alias Motionbuilder: actor and markers Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 retargeting problems Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 retargeting problems Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 Applications ? Entertainment ? Medicine ? Arts / Education ? Science / Engineering Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 Entertainment: Live Action Films ? Computer generated characters in live action films (. Battle Droids and many others in Star Wars Prequels, Gullum in The Lord of the Rings, King Kong in King Kong , Davy Jones in Pirates of Caribbean) Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 Entertainment: 3D puter animations ? Characters in puter animated files (. Polar Express, Monster House) Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 Entertainment: Video Games ? Video games by Electronic Arts, Gremlin, id, RARE, Square, Konami, Namco, and others, (. Enemy Territory, Devil May Cry) Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 Medicine ? Medicine (., gait analysis, rehabilitation) ? Sports medicine (. injury prevention, performance analyses, performance enhancement) Gait Analysis Service Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 Arts / Education ? Dance and theatrical performances ? Archiving (., Marcel Marceau) OSU/ACCAD Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 Science / Engineering ? Computer Science (., human motion database, indexing, recognitions) ? Engineering (., Biped robot developments) ? Ergonomic product design ? Military (., field exercises, virtual instructors, and roleplaying games) Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 Aspects of the Problem ? “Gross” Body movement NOT: 187。 problem: occlusion, marker is not seen ? use more cameras ? markers need to be labeled 187。 capture area can be limited by transmitter 187。 Spider Man ? Games 187。 Matrix 187。 high quality capture 187。 cables unwieldy 187。 portable, unlimited range 187。 sensors on body 187。 David J Sturman, “A Brief History of Motion Capture for Computer Character Animation”, Character Motion Systems, SIGGRAPH 94, Course 9 “The creation of a 3d representation of a live performance” 187。 sources and sensor on body 187。 no built in positional reference ? disadvantages 187。 sound reflections can reduce accuracy Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 optical capture (passive) ? markers are attached to a performer 187。 marker crossover, which marker are you looking at? 187。 Grand Theft Auto III 187。 Everquest II 187。 motions need to be able to blend into one an another 187。 positions of markers are recorded ? retarget motion on a virtual character 187。 Cloth, clothing, secondary movement 187。 Use the best one for the job Motion Representation MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 Goals for Parameterization ? Compact 187。 Sparse samples + interpolation 187。 Popovic 95] Motion Signal Processing MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 Manipulating motion ? Manipulate time 187。 Be sure to make time correspondence ? Transition between motions ? Time varying blend (a=0 1) 187。 Can create long and novel “streams” (keep putting clips together) ? Challenges: