> If you get stray black splotches in your shot, increasing the global
> max_trace_level will reduce their number.
> ...
> These stray splotches are due to an implementation blunder in POV-Ray, and
> basically appear in any scene that has reflection or refraction; I'll make sure
> it gets fixed in the next 3.7 beta.

   You're absolutely right: I discovered this cause of artifacts while doing 
some tests last month, and I was going to publish an article about it on my 
site, but Real Life got in the way and I forgot about it...

   Usually, just increasing a bit the default max_trace_level to 7 is 
enough, and it doesn't have much impact on regular scenes. It is really 
evident when you have a perfectly square room with reflecting walls: the 
corners receive a lot of artifacts. So I figured out it was something to do 
with max_trace_level without looking at the code... ;)

--
Jaime

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