Tim Nikias schrieb:
>>Note the high precision!
> 
> 
> That's probably part of your problem, actually. Fractals are *very* busy
> objects. Try lowering the precision and see how your julia gets smoother.
> With high precision, POV-Ray interpolates less and you easily end up with
> clouds of particles.

Nah, I dont't think so.
It seems to be related to floating point precision.
Altering the precision statement can make some holes
(what the black spots are actually) appear
and disappear while some are not affected at all.
These ones disappear below max_iterations=9 approximately.
They also look different. Mostly they have a linear edge
which moves in parallel to camera movement and disappears
at some angle just to reappear later (in animation) somewhere else.
There is an example in p.b.i. and there is an animation
rendering at the moment which I'll post later.

Regards,
Sebastian

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