﻿ Curved Spaces Help — Preferences — Perspective — Stereoscopic 3D

perspective preference

# Stereoscopic 3D

If you’ve got a pair of red-cyan (or red-blue or red-green) glasses, you can see the tilings in stereoscopic 3D. Just be sure to put the red lens over your left eye and the cyan (or blue or green) lens over your right eye. Otherwise the 3D effect won’t work and you’ll end up with a headache.

You can buy 3D glasses online for about 40 US cents per pair if ordered in quantities of 50 or more, for example from American Paper Optics. You want anaglyphic glasses, preferably red-cyan. (Red-blue or red-green would also work, but red-cyan lets your right eye see the blue and green channels combined.)

Stereoscopic 3D works fine with its default settings, but if you want to experience the exact depth effects that you would see if you lived in the given finite universe, you’ll need to tell Curved Spaces

• the spacing between your eyes, measured from the center of your left pupil to the center of right pupil, and
• the length in centimeters that you wish to assign to one intrinsic unit within the model, in effect making the model universe larger or smaller relative to the size of your body.
Curved Spaces combines those two measurements (dividing the former by the latter) to accurately determine how far apart your eyes are in the model universe, so the stereoscopic effect comes out right.

Stereoscopic 3D is most effective if you stand a meter or two in front of large screen in a lecture hall — so the image fills most of your field of view — and you provide the exact measurements of this environment. The results may surprise you: your Euclidean intuition will judge distances in hyperbolic spaces to be much smaller than they really are, while in spherical spaces some objects will have a negative parallax!