[ansible]

I think if you're tracking the user's position, then it may be practical to beam different images to each eye for a good 3D experience.

That's actually how (kinda) Stephenson's VR system he describes in Snow Crash works.

This kind of gets away from many of the issues you have with the Oculus Rift where you have such a tiny window of time (20ms or so) to react to how the person is moving his head. You still have to change the image based on the user's position, but not as much on head rotation which is the really hard part. Just each eye's location in space matters.

Multiple users would likely require multiple projectors.