Hi,
   I've rendered in povray what I am expecting with my trace scan script.

This way, you can clearly see what I have, what I expect and what I get 
instead!

First image shows my sphere { 0,1}
Second image shows the trace scan distortion on sphere { 0,1 }

Third image shows my torus { 0.7, 0.3 rotate x*90 }
Fourth image shows the trace scan distortion on the torus.

Hope this makes things more clear!...
   Xilo

-- 
Dedicated to audio/visual and interactive artwork.
Author of The Primary Colors of CSound:
http://www.geocities.com/simonlemieux/PCCS/index.html

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Download 'sphere-pov.jpg' (6 KB) Download 'sphere-gl.jpg' (31 KB) Download 'torus-pov.jpg' (8 KB) Download 'torus-gl.jpg' (23 KB)

Preview of image 'sphere-pov.jpg'

Preview of image 'sphere-gl.jpg'

Preview of image 'torus-pov.jpg'

Preview of image 'torus-gl.jpg'