P3D Re: Multiple-image stereograms

[aifxtony@xxxxxxx (Tony Alderson)]

>Not familiar with a lot of the terminology, so the subject is a guess at
>what I think could be the term for a certain type of stereo image - one in
>which there is not just a pair of images but a whole string of them, which
>when viewed parallel- or cross-eyed give the effect of depth, and which
>allow the viewer to see much wider images than a pair on their own.<

These are called "wallpaper stereograms."  You should email George Themelis
(easy to find on this list) and request a copy of his latest newsletter;
which has an interesting interview with the inventor of the technique.

For crosseye viewing, you can just set up a repeating array of "columns" in
your 3D modeling program (there are some freeware/shareware programs on the
net). As an example, go find a flat, "head-on" photograph of a greek
temple. Cross your eyes to fuse adjacent columns--and see stereo!  (Note to
Dr. T--the greek origins of our craft's name was not mere coincidence!  ;-)
)

Parallel viewing is a little trickier-you either have to counter rotate the
colums, or rearrange the elements. The best way to figure this out is to
study the successful efforts of others. Try making some kind of overlay so
you can measure the stereo shifts.

Tony Alderson



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