> What causes povray to render some parts unsmooth although the
> norm-vectors seem to be calculated right?


That particular triangle mesh has some extremely thin triangles inbetween
the larger ones. This is most visible near the lower left of the wireframe
image, right below where the banding begins in the other image.

This is causing a large part of the interpolation of normals to be done in a
very tiny space, so the normals of the adjacent larger triangles which make
up 99% of the surface in the problem areas do not match up.

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

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