> Would you mind filing a bug report

http://bugs.povray.org/task/203

> Changing pretrace_end to 0.01 make those spots disapear.

You can still make out their shapes at very high contrast. Actually,
it looks like "always_sample" doesn't remove them completely either.
The render produced by 3.6 is also not entirely uniform, but it doesn't
have this distinct pattern.

Originally I was rendering the shadow of a "no_image" object standing
on a plane and tuned "error_bound" all the way to .01 to get an
accurate edge where the object touched the plane. At this setting these
artifacts appear as random black dots and it's very hard to get rid of
them within a reasonable render time.

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