In article <O+WoS### [at] econymdemoncouk> , Mike Williams 
<mik### [at] nospamplease>  wrote:

> It almost makes sense. However, if that were the case, then I'd expect
> to see the root solver die on any partial image render that included the
> offending pixel. This is not the case. It wasn't easy to find any
> partial render that exhibited the problem. The smaller partials that
> I've tried, including the area around where it starts to go wrong, don't
> exhibit the problem.

The random number stuff inside POV-Ray can really be complicated sometimes.
I do know that the way you render something can have an effect on the result
with the "more" random patterns.  As I never looked into any part of that
code I do not know what in particular happens for each and every request to
evaluate a pattern at a specific point.  You have to see the random numbers
simply as a stream on numbers.  Every time you start a render you start at a
particular position in the stream (which may or may not be the same, I don't
know).  So, as for every different starting point a different number of
random numbers is requested, the effect changes its position and so on.

Anyway, I am really not the right person to explain how and why patterns
work the way they do...


    Thorsten


____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

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