Thomas de Groot <tho### [at] degrootorg> wrote:
> I read your message and I am almost sure this is an epsilon problem,
> same as when Bill Pragnell and me, and others, modelled the Ringworld a
> couple of years ago. For the POV version then in use, an unofficial
> patch was issued, but the problem appeared again with the 3.7 version
> and, as far as I know, has not been corrected. It is a simple matter of
> a more accurate epsilon value. Strictly speaking this is not a bug and
> you can try to avoid the problem by scaling down the HF and elevate the
> camera a bit more until it disappears. Personally I feel that as an
> inelegant solution though, and I would much prefer an appropriate
> epsilon value.
>
> Thomas

Thanks Thomas, that explains the effect. But it means 0.00003 < epsilon. I had
assumed it smaller. The actual value seems to be ok for most scenes. A smaller
value might result in a severe prolongation of the render times. Best would be
an option within the global settings.

Best regards,
Michael

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