Slime schrieb:
> 
> > Thanks, the sample scene from Nicolas was very useful.  I am not yet
> > completely sure what is the best solution but the source of the problem
> > is identified.
> 
> Noticed you posted a bug report in povray.bugreports. I'm just curious why
> you think that Compensate_For_Alpha_AA is the source of the problem? 

I tested it...

> I had
> also suspected that it was the source, but then I noticed that it didn't
> change from POV-Ray 3.5 to 3.6.
> 
> Do you think that it worked wrong in 3.5 also, but it never caused a problem
> because color clipping occured earlier in the process?

What's done in Compensate_For_Alpha_AA() is not really accurate
scientific method and therefore it is not working properly for all kind
of input values.  It is not yet decided what will ultimately be the
solution but of course there will be one.

-- Christoph

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