I used PovRay to create a number of illustrations for a Vision Research
paper
   http://astronomy.swin.edu.au/~pbourke/papers/visres/visres.pdf
Most of the images where very harsh crisp colour, orthographic cameras,
minimal lighting, no shadows, etc. Not terribly satisfying .... here's a
page from the paper with one of those diagrams and the geometry the way it
was supposed to be seen. :-)

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