> I want to make a realistic looking CD.

check out the excellent cd made by Rune S. Johansen
http://rsj.mobilixnet.dk/3d/cd/cd.html

> should get a bright spot in the center of its shadow as a result of
> light diffraction

I belive I've heard Megapov (a povray patch) can do that?
http://nathan.kopp.com/patched.htm
Correct me If I'm wrong.

--
Peter
http://hertel.no/bigone

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