After Chaps' posting regarding stereograms, I pounded away for a while and
finally came up with working stereogram 'camera'.  It creates the multiple
views using mirrors, no_image and a cylindrical projection camera.  I will
post the macro as well as a sample scene in p.b.s-f. Please let me know what
you think and if you have any suggestions.

This is what the sample image looks like at 800x400 with AA0.1:

tgq


--
camera{location z*13look_at 0}light_source{15 15looks_like{sphere{0 10
}pigment{rgb 1}finish{ambient 15}}}union{torus{3,0.5rotate x*90}cone{y
*4,.5,-y*8,0}cone{-x*4,.5,x*8,0}pigment{rgb<.7,.6,.4>}finish{ambient 0
diffuse 0reflection{1fresnel on metallic 1}}interior{ior 25}rotate 15}
plane{y,-7pigment{checker rgb 0rgb 1scale 4}finish{diffuse.1}}//   TGQ

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Download 'StereoSample.jpg' (40 KB)

Preview of image 'StereoSample.jpg'