Hi,

> All the maps of his that I have tried have had very strange
> effects on the surfaces, almost like "light noise".

I tried your scene, with some other maps, too... and I got the
same splotchy look. I fiddled with the radiosity parameters for
a while, and I came up with the following:

Use max_sample (somewhere in the range 5..10), it makes the whole
scene a bit darker (which would be ok for the grace probe, it's a
rather dark place after all)... but you can adjust that with the
brightness parameter if you want. The result looks a bit different
and I don't know if it's "realistic" any more, but at least it looks
relatively smooth and it didn't look too bad when I tested it.

  radiosity {
    max_sample 5
    count 1600 error_bound 0.05
    pretrace_start 8/100 pretrace_end 1/100
    recursion_limit 2
    brightness 1.5
  }

Cheers,
Artur.

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