That is what I suspected. By disturbing the normals slightly it worked.
I wonder why does POV-Ray behave like that.

Thanks for the information,

FlyerX

Shay wrote:
>"FlyerX" <fly### [at] yahoocom> wrote in message
>news:web.3f8f6510af4cd4389d6b971d0[at]news.povray.org...
>
>POV-Ray is going to treat your triangles like flat triangles when all or
>the vertex normals are equal. Inconvenient in this case. You could
>either use an ambient finish and no light_source, or change your normals
>to something like <0,.0001,1>, <0,.0002,1>, etc..
>
> -Shay
>

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