Moja lekcja

 0    20 Datenblatt    koxg
mp3 downloaden Drucken spielen überprüfen
 
Frage English Antworten English
Convergence vs accommodation
Lernen beginnen
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
Accommodation
Lernen beginnen
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
Stereo vision as depth cue
Lernen beginnen
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
Cave and HMD rendering frame?
Lernen beginnen
60 fps for CAVE, 90 for HMD
Human field of view (horizontal, vertical, stereoscopic)
Lernen beginnen
horizontal - 2*90, vertical - 120, stereoscopic - 100-120
HMD, CAVE field of view od regard
Lernen beginnen
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
color fidelity of polarization and infinitec
Lernen beginnen
polarization +, infinitec -
Broad Phase?
Lernen beginnen
can objects possibly intersect? Test bounding volume
Narrow Phase
Lernen beginnen
Test the individual primitive intersections. Use individual triangles etc.
gain of the screen material: polarization vs active stereo
Lernen beginnen
polaritzation: screen material may not be destroyed, brightness uniformity(-), active stereo: screen material may be diffuse, brightness uniformity (+)
pros and cons of passiive stereo with polarization and active stereo with shutter glasses in a projector based VR system
Lernen beginnen
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
name cues that provide depth in VR
Lernen beginnen
stereopsis, ocular motor factors, motion paralax
describe HOMER and pros and cons of homer
Lernen beginnen
Hand-cetnered Object Manipulation Extanding Ray-casting///selecting objects later manipulated by natural hand (+)unlimited selecation range (-)limited manipulation range
Voodoo Dolls
Lernen beginnen
manipulating miniature copy of objects (+) manipulation independant of distance, size or occlusion (-) requires two 6DoF devices
2 handed ray
Lernen beginnen
+more precise than one handed +specify ray length via distance between hands, -2device, -fatigue, -cumbersome
ray
Lernen beginnen
+easy,+accurate, -hard to select small or far away objects, -high angular precision needed
flashlight
Lernen beginnen
+not high precision needed, -hard to point at small and crowded objects
interSelect
Lernen beginnen
+reduces jittering, +easy to select small, crowded, moving objects////////// -only works for lines/points/objects they can approximate
Convergence
Lernen beginnen
depth cue about focusing distance for the eye to focus on the object
Name the difference between and the advantages/disadvantages of active and passive optical tracking.
Lernen beginnen
active: LEDs, require cabling. ///// passive: retro-reflecting markers, no cabling.

Sie müssen eingeloggt sein, um einen Kommentar zu schreiben.