【正文】 ND VIRTUAL ENVIRONMENTS FALL 2022 acoustic capture ? InsideOut ? still developing ? Active Markers – 187。 transmitters are attached to the performer and sequentially emit audio signal, a “click” ? receivers measure the time to receive the signal, triangulate and pute the position of the transmitter ? advantages 187。 no occlusion ? disadvantages 187。 cables unwieldy 187。 rate of transmission not high enough to support enough transmitters 187。 size of the capture area is limited 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。 passive reflective markers 187。 more on active markers later ? a system of cameras record the position of the markers 187。 2many cameras Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 optical capture (passive) ? advantages 187。 freedom of movement 187。 high quality capture 187。 high throughput ? fast sampling (200 fps at a high resolution) ? can capture fast motions ? can have a large capture space ? can capture many markers ? disadvantages 187。 occlusion, markers are can be hidden from the camera ? additional performers will increase occlusion ? may be able to add redundant cameras 187。 marker crossover, which marker are you looking at? 187。 cost $$$ 187。 extensive post processing (the marker?s have to be located and identified) Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 major optical players Motion Analysis ? ? Films 187。 Lord of the Rings 187。 King Kong 187。 Matrix 187。 Final Fantasy ? Games 187。 NBA Live 2022 187。 Grand Theft Auto III 187。 Mortal Kombat 4 (Midway) ViconPeak ? m/ ? Films 187。 Polar Express 187。 Harry Potter and the Prisoner of Azkaban 187。 The Hulk 187。 Spider Man ? Games 187。 AllStar Baseball 2022 187。 Buffy the Vampire Slayer 187。 Everquest II 187。 NHL 2K3 (Mocap by Red Eye Studio) Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 magic capture ? Outside/In ? receivers are attached to the performer?s body ? pute the position and orientation from receiver to central magic transmitter 187。 AC and DC systems ? originally developed for targeting in tactical military aircraft ? advantages 187。 no occlusion ? disadvantages 187。 cabling can interfere with movement (improvements?) 187。 capture area can be limited by transmitter 187。 metal in vicinity can interfere with system 187。 capture volume can be limited Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 Mocap pipeline ? Planning for capture ? Setup and calibrate system ? Capture performer, obtain marker positions ? Retarget to a character ? Edit/cleanup Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 planning ? motion capture requires serious planning ? anticipate how the data will be used ? garbage in garbage out ? shot list ? games 187。 motions need to be able to blend into one an another 187。 capture base motions and transitions 187。 which motions transition into which other transitions 187。 cycles/loops Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 movement flowchart for games ?Planning and Directing Motion Capture For Games By Melianthe Kines Gamasutra January 19, 2022 URL: Mocap Overview MOTION PLANNING IN REAL AND VIRTUAL ENVIRONMENTS FALL 2022 processing passive markers ? each camera records capture session ? extraction: markers need to be identified in the image 187。 determines 2d position 187。 problem: occlusion, marker is not seen ? use more cameras ? markers need to be labeled 187。 which marker is which? 187。 problem: crossover, markers exchange labels ? may require user intervention ? pute 3d position: if a marker is seen by at l