On Thu, 24 Apr 2003 16:11:30 +0200, Achill <ach### [at] matumde> wrote:
> I must admit, I do not know how povray "knows" to distiguish "inside" > and "outside".
It's hardcoded definition of each primitive object. Like math representation of
its surface, function to calculate normal vectors, mapping uv space on its
surface etc.
ABX
tum