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29 April, 2005

Doing the 'Time for Space Wiggle'

Conventional stereographic imaging works by taking two photographs from slightly different viewpoints, displaying them next to one another, and viewing one with each eye, simultaneously.  The brain interprets the result as three-dimensional.
If he didn't actually invent it, Jim Gasperini has certainly popularised an alternative approach, which involves displaying two images in a simple animation (.gif or Flash), so that they are viewed with both eyes, one at a time but in rapid succession (12 frames per second is optimal, apparently) i.e. two images viewed in chronological separation, not spatial.  Again, the brain combines the two inputs into a 3D effect.

It really works, though more extreme stereographic separation tends to introduce a distracting 'wiggle'. I'm going to have to try this myself (not necessarily the wiggle).

It seems this site was quite famous in 2003, but I'm afraid I've just stumbled across it for the first time. Another disclaimer: some of the example images are of scenes from the Burning Man festival, so feature a small amount of nudity. If you have a problem with that... well, you're missing out.

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