POV Manual Quote...

6.11.11.2.13  Pretrace
To control the radiosity pre-trace gathering step, use the keywords
pretrace_start and pretrace_end within the radiosity{} block. Each of
these is followed by a decimal value between 0.0 and 1.0 which specifies
the size of the blocks in the mosaic preview as a percentage of the
image size. The defaults are 0.08 for pretrace_start and 0.04 for
pretrace_end 


Yes, but does the pretrace affect the quality of radiosity or is it just
a mosaic effect for the render-window? 

It's not quite clear from the above if smaller values will give better
results. 

I know for sure it will generate smaller squares in the mosaic!

object {
   Grey_Matter
   photons { target Need_More_Info }
}

Thanks

-- 
(MIKA) Marc Champagne
marcch.AT.videotron.DOT.ca
Montreal, CANADA

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