Quote:
Originally Posted by mpeg2
There's another issue which is going to be very hard to solve with technology: Human vision uses two mechanisms for depth perception - parallax (the different image that each eye sees) and the focus depth for the eye (conveyed via the muscular effort requred to focus at different distances). Unfortunately, for VR these disagree - the parallax is easily handled by having different views for each eye - but the focus depth is always the same - the distance from the eye to the display device is constant.
For many people, this difference causes nausea - with no good solution as yet.
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There are two solutions:
1. Complex variable optics that vary the apparent image distance / focus.
2. Less complex optics that involve direct laser scanning of the retina.
Neither of these is simple and they need to track the cornea / eye focusing to make the requisite Z axis distance sharp in both cases and vary the optics in system one.
It doesn't just cause nausea, but a breakdown of 3D effect for about 20% of people (the proportion who don't have perfect binocular vision and who "3D" TV doesn't work) and headaches due to eye(s) pointlessly trying to work focus.
A 3D system is merely stereoscopic if it doesn't work with one eye closed. You can easily test this in real life even indoors, because the slightest head movement reveals if the scene is a flat image or real 3D and
your eyes automatically focus on what you want to study in the scene. AFAIK no affordable domestic VR works well enough even apart from the focus distance issue, which can be solved (expensively). The scene has to be re-rendered even if eyes and head are not moved if your item of interest is reading a nearby scroll, a pair of feet under the curtain at the back of the room, or the creature / vehicle descending the mountain path /road (friend or foe).
Current VR is a waste of money for most. There is some value for so called "AR" where the information is simply what would be on a vehicle windscreen (Fighter aircraft, tank, regular aircraft or road vehicle).