>
>   This is most probably caused by the inverted normals problem described
> here:
>
> http://tag.povray.org/povQandT/SmoothTriangleArtifact/index.html
>
>   Also this is good to know about smooth triangles:
>
> http://tag.povray.org/povQandT/TheShadowLineArtifact/index.html
>

I read those, but I found it strange that it all works for all the other
triangles. A small change in position or normal makes the artifact come or
disappear...


>   Increasing the mesh resolution (ie. more triangles) might help
> a bit (at least reduce the sice of the artifacts).
>

Indeed, but the data I have is on a 40x40 grid. And when the normals are
determined, the outer bounds are lost, so only 38x38 remains. Not really
fancy for face recognition...

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