Tim Nikias wrote:

> The problem is simple. Even though the triangles' normals have their part in
> the lighting calculations, the entire triangle has a distinct angle in which
> it is positioned in regard to the lightsource. And triangles still throw
> straight shadows, so even if they are "smooth-curved" you'll get shadows
> unterneath the triangles. See here:
> http://tag.povray.org/povQandT/TheShadowLineArtifact/index.html
> 
> What you'd need to do is raise the resolution of the mesh, and maybe use a
> true area-light (with "true" meaning several point lightsources, not the
> area_light feature of POV-Ray: it only calculates smooth shadows, not smooth
> lighting).
> 
> Regards,
> Tim

A fine idea, but thats not the solution. You can put the lightsources 
where you like and still get these results.

But i think i have found the reason for this. It seems to be a bad 
stl-output out of the cad-program. I can post a zoomed picture tommorow 
and show the triangles the cad-program produces in these parts. Awful ... :)
I will try an other stl-output with a newer version and perhaps other 
options, but this can take time, i don't have the dongle available today ...

Hartmut

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