Believe it or not, you don't actually need the barrier. If you go back to the sample stereogram image you posted (the black-and-white one) and adjust your eyes properly, it renders a single 3D image. The partition used to separate the images in old stereograms just made adjusting your eyes easier. Those old "magic eye" images worked on the same principle, though they only used a single image and did not require your eyes to cross quite as much.CRTGAMER wrote: Plus the older stereoscopic concept had to separate each eye to each screen to achieve the 3D effect.
Incidentally, there's actually a 3D stereogram mod for Quake II. You can see screenshots of it here:
http://www.leweyg.com/download/SIRD/q2/ ... ml#screens
