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Convergence vs accommodation start learning
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it happens when your brain recieves mismatching ues between the distance of virtual object and the focusing distance required for the eyes to focus on that object
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start learning
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It's the process of changing the shape of eye, contracting or relaxing muscles in the eye. This helps us to judge distance from an object we look at
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Stereo vision as depth cue start learning
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each eye recives slightly different view of world, which is then combined to percieve 3D depth. Object is projected onto 2 reinae depening on the distance of object. The disparity varies with the object distance
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Cave and HMD rendering frame? start learning
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60 fps for CAVE, 90 for HMD
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Human field of view (horizontal, vertical, stereoscopic) start learning
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horizontal - 2*90, vertical - 120, stereoscopic - 100-120
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HMD, CAVE field of view od regard start learning
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HMD: FOV-much smaller than human eye, FOR - can get to 100% with good tracking system//// CAVE FOV-might get up to the same as human eye, FOR: depends on arragment and distance of projection surface
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color fidelity of polarization and infinitec start learning
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polarization +, infinitec -
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start learning
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can objects possibly intersect? Test bounding volume
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start learning
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Test the individual primitive intersections. Use individual triangles etc.
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gain of the screen material: polarization vs active stereo start learning
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polaritzation: screen material may not be destroyed, brightness uniformity(-), active stereo: screen material may be diffuse, brightness uniformity (+)
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pros and cons of passiive stereo with polarization and active stereo with shutter glasses in a projector based VR system start learning
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polarization: ghosting may occur, good colors, buffer snap, medicore cost, screen material must maintain polarization./////// Shutter Glasses: no ghosting, good colors, buffer snap, glasses, projector, cost: expensive, screen material: arbitary
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name cues that provide depth in VR start learning
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stereopsis, ocular motor factors, motion paralax
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describe HOMER and pros and cons of homer start learning
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Hand-cetnered Object Manipulation Extanding Ray-casting///selecting objects later manipulated by natural hand (+)unlimited selecation range (-)limited manipulation range
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start learning
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manipulating miniature copy of objects (+) manipulation independant of distance, size or occlusion (-) requires two 6DoF devices
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start learning
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+more precise than one handed +specify ray length via distance between hands, -2device, -fatigue, -cumbersome
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start learning
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+easy,+accurate, -hard to select small or far away objects, -high angular precision needed
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start learning
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+not high precision needed, -hard to point at small and crowded objects
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start learning
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+reduces jittering, +easy to select small, crowded, moving objects////////// -only works for lines/points/objects they can approximate
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start learning
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depth cue about focusing distance for the eye to focus on the object
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Name the difference between and the advantages/disadvantages of active and passive optical tracking. start learning
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active: LEDs, require cabling. ///// passive: retro-reflecting markers, no cabling.
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