I have made some first actual renders with new distributions, here are
some results:

http://www.schunter.etc.tu-bs.de/~chris/files/rad_test.html

The sample sets i generated have 300 samples which are sorted afterwards
for best results at lower count values.  The scene uses a count of 50. 
Sorting is somewhat tricky with non uniform distributions so the 50
samples are probably quite different from a perfect cosine theta
distribution.

The first two images are the old and the new distribution.  It can be seen
that the differences are not that strong but i think that the second one
is somewhat better.  Testing with a distribution optimized for exactly 50
samples could be worth trying too.

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).  

The final image shows the same settings with randomly rotated sample set
(based on an idea by Michael Andrews:

Subject: Fluorescent strip radiosity test scene  (22K + 24K)
Date: Thu, 28 Nov 2002 13:25:06 +0000
From: Michael Andrews <m.c### [at] readingacuk>
Newsgroups: povray.binaries.images

Christoph

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