"Jaap Frank" <jjf### [at] xs4allnl> wrote in message
news:3f0b3299$1@news.povray.org...

I looked at your code, and the mesh behaves perfectly. Remember that the
"back" of the red triangle is green and vice-versa. This means that when
you flip the two of them <0,180,0>, you will see an image which looks
the same as before the flip. Try rotating by <180,0,0> (before
subtracting T) and see what I mean.

 -Shay

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