> The third image shows the result when using a completely uniform
> distribution and weighting the samples according to cosine theta.  The
> result seems worse although a final conclusion would require further
> tests.  The interesting thing is that turning off the different weighting
> strongly weakens the artefacts (fourth image).

there is an error in the comment in povray source code, the samples are
distributed according to cos(theta)*sin(theta) (we can also confirm this by
looking at the illuminance integral)
I've made a graph with the distribution for the pov samples (compared to cos
and cos*sin) at http://195.221.122.126/samples/proba.jpg

M

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