> I still end up with the same shading problem.

I discovered myself at one point that, if a smooth triangle has all three
normals the same, POV-Ray ignores them and uses the triangle's actual normal
instead. A bug? Design flaw? Who knows.

You can fix the problem, I think, by very slightly changing one of the
normals:

smooth_triangle { P1, N, P2, N, P3, N + <0,0,.000001>}

 - Slime
 [ http://www.slimeland.com/ ]

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