Am 18.05.2011 00:13, schrieb aaz:

> Rendering produces dark splotches at the centers of the pretrace
> blocks. Blocks rendered earlier have darker splotches. They also differ
> in shape between renders even with +HR (but not with +WT1). Turning
> "always_sample" on removes them, as does increasing "count" past 1000.
>
> I wonder if this might be a bug, as 3.6 doesn't produce these artifacts
> regardless of "always_sample" and "count".

Yuck!

The radiosity settings are a poor choice (low error_bound and a low 
number of pretrace passes don't mix well), but it seems there /is/ 
something else fishy. I'll have a look at it. Would you mind filing a 
bug report at http://bugs.povray.org in the meantime?

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