4720abd9$1@news.povray.org...
> Actually I'd have presumed that they would focus attention of rays to 
> those areas that are still noisy to prevent that some surfaces are noisy 
> much longer than others, but it still might perhaps explain why the 
> details seen though the windshield etc. are so much more noisy...

For the technically-inclined, here's a discussion of the technique and of 
the noise issue.
http://renderspud.blogspot.com/2006/10/biased-vs-unbiased-rendering.html

G.

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