"Gilles Tran" wrote:
> It seems to work like the other unbiased renderers I've tested: the image 
> starts black, then grainy, then less grainy, and is progressively 
> refined... until the user decides it's good enough and stops the render.

I'd guess that whenever rays hits a both reflective and refractive surface, 
each ray is not split in two, but some of the rays go through while others 
are reflected (say, 50/50). So a surface seen through a glass pane will be 
noise for twice as long as a surface seen directly. A surface seen through 
*two* glass panes will take four times as long to get smooth etc.

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...

Rune

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