Am 18.01.2013 19:49, schrieb timer:
> clipka <ano### [at] anonymous org> wrote:
>>
>> That's surprising to me. Can you give a sample scene?
>
>
> During generating a sample scene I realize that this work. So I worked reverse
> to localize my real problem.
>
> It look like a combination of two paraobolic mirrors generate this singularity.
It appears to me that the quadric solver goes berserk on the second
parabola whenever a ray is exactly parallel to the parabola's axis
(which happens when the camera is exactly in the first quadric's focal
point, but I suspect it would also happen with an orthographic camera).
At present my only idea would be to try modeling the second parabola
with some other primitive type (isosurface for instance) - and to file a
bug report on http://bugs.povray.org.
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