> When I rendered this file, I got this:
>
http://news.povray.org/povray.binaries.images/thread/%3Cweb.551e92b74514bfb213709ea20%40news.povray.org%3E/
>
>
>
> And here is a discussion several days ago, which may be a similar phenomenon.
>
http://news.povray.org/povray.bugreports/thread/%3Cweb.5517c69b250fa02e5189b500%40news.povray.org%3E/
>

It looks like it could be a precision/accuracy isue as multiplying the 
dimentions by 50 makes the artefact disapear. You may hit the limits of 
double precision FP numbers.

Scaling up, even by 1000, DON'T improve the end result. In fact, when 
scalling up, I get a full black circle, not just parts of it.



Alain

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