While watching a video on Oculus/Gear VR optimisations they mentioned an interesting technique for optimising large scenes with lots of objects far away from the user. The technique involves setting up 2 cameras; one for short distance rendering and another for long distance rendering. The short camera renders to both eyes and the far camera renders to one eye (left) then the image is copied to the other eye. The idea is that at a distance the offset of objects between each eye is so small...
Copying one eye image to another
Copying one eye image to another