Well, it's surely depends of the order. But, what's the condition that
allows Pov-Ray to put interior_texture on the triangle? I mean, if by
computing the normal length and check if it's zero or greater, the surface
receive the texture, otherwise interior_texture...? Then, I would be able
to check for that in my C++ program that generate .pov file.

Right now, the vertices of the triangle is moving over time and there's a
"flip-flap" of the front/back texture in the animation.

regards,
Impress

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