OK, well, I've never tried to do a scene using radiosity before, so here
goes...

As I understand it, anything with a non-zero ambient setting will in effect
"glow". My experiments seem to back this up. Only trouble is, they don't
glow very much; I'm having to use things like "ambient 10" to get enough
light in my scene! (That's fine if the thing is white - doesn't work too
well for pastel shades though.)

Also, the images are very patchy. Now, when I just dunked an empty
radiosity{} block into my scene, I wasn't suprised that the defaults didn't
magically work perfectly. But... I've been fiddling with the settings for
ages, and it's still blotchey. I've managed to improve it quite a bit, but
it's still there. POV-Ray is obviously trying its hardest to smudge out
those pixel artifacts from the pretrace step... but now quite suceeding.

Oh, and about that pretrace step... It seems to interact with the normal
mosaic preview INI setting... Is this correct? Does changing the INI
settings affect the final image, or only the preview process?

Any help would be appreciated. I can post an image if it helps - but
basically it's a large empty room with a smallish opening in the roof that
lets in the light from a superambient object outside. My radiosity settings
at the moment are:

radiosity
{
  adc_bailout 0.01 / Cheat
  recursion_limit 5

  count 400
  nearest_count 7
  error_bound 1.5

  pretrace_start pow(2, -6)
  pretrace_end   pow(2, -9)
}

(It's a giggahertz CPU ;-)

Thanks.
Andrew.

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