"Hasan3" <PRO### [at] Yahoocom> wrote:

> Florian, thanks for explanation. I have read this article :
> "Firstly, don't think that it is a bug in POV-Ray. It isn't a bug, but a
> real problem caused be the lighting model used in the renderer engine that
> is quite difficult to surpass. It's not a problem in POV-Ray in particular,
> but a problem in raytracing in general. Every raytracer will have this same
> problem when using perturbed surface normals (unless there's some fix coded
> into it)."
>
> I rendered this object with other engines, for example Yafray :
>
> I think, this is a deficiency for Povray..

Clearly, the other engines have a fix for this coded in. But it is a problem
with the raytracing algorithm and modified normals, rather than a defect in
the way POV implements the algorithm (a bug).

I think there is at least one unofficial version of POV with a fix for this.
I think Slime-POV had one (but IIRC it's based on POV 3.5). There may be
others.

Tom

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