I'm somewhat surprised that no one has commented on your proposal; one possible
reason might be that POV-Ray is a much more 'mature' raytracer than Rayshade
(which appears to be an older application from the 1990's.)

However, the Rayshade project itself is interesting (I didn't know about it
until now.) Out of curiosity, I went to its original website...

http://www-graphics.stanford.edu/~cek/rayshade/rayshade.html

.....then clicked on one of the links there ("Notes on Rayshade" by Stephen
Peter)...

http://www-graphics.stanford.edu/~cek/rayshade/raynotes/contents.htm

I picked a subject at random--"Transforms"-- and was completely surprised
by how concise and well-written it is. It's the best description (with
examples!) of using a transform matrix that I've yet seen. Until now, that
subject has been quite a mystery to me. POV-Ray's documentation could use such
an excellent explanation!

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