That's the typical coincidence surface problem:
POV-Ray has no means of checking if two
objects actually have coincident surfaces. It just
happens to hit one or the other by random.

This is also true for internal calculations of light,
I guess.

"Timothy R. Cook" wrote:

> Why not assume it's on both sides?  Or neither...

--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html

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