MegaPov radiosity is a whole other animal.  Certainly is easier to use and get
moderate enough
results just by having a 'radiosity { }' in the global block and turning it on (+qr).
'brightness' in the official version doesn't do anything really, far as I know, except
show a
change in the mosaic preview.
Most important probably would be the 'gray_threshold' and 'recursion_limit', the
threshold being
how much color-bleed to do with near zero being more and nearer 1 least.  Recursion is
how many
times to recalculate the samples I believe, MegaPov breaks the 2 barrier for it. 
Count is the
samples so it's a prime factor in smoothness.
The 'minimum_reuse' is a kind of stepping stone into how the samples are checked,
whether nearer or
farther apart.  Of course I can only try and explain those things in my own way so
that's not
altogether a good thing.
And distance maximum is the difficult part, being scene scale dependant, but once
again using 0 or
MegaPov is a easy way around it.

Bob

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