After Nathan Kopp's great "box with no lights" discovery, I tried to
adapt it to an old scene of mine. Note that it's just an experiment,
I'll turn it into a real scene with good textures and all only if I can
get it to work.
As you can see, overall lighting could be fine, but the result is
horribly patchy on the back wall in spite of "high" radiosity settings.
Any clue on how to fix that ? Lowering the distance_maximum make it
slooow. Having more samples doesn't change anything. I'll post the scene
if somebody wants to have a try.
One funny (logical ?) thing : I had to remove the transparent window
panes for radiosity to work. I guess it didn't like the ambient 0 value
of the glass texture.

Gilles Tran

Radiosity settings :
    count 800
    error_bound 0.2
    gray_threshold 0.4
    distance_maximum 0.4
    low_error_factor 0.6
    nearest_count 9
    minimum_reuse 0.006
    brightness 3.3
    recursion_limit 2

The "light" is background{color White*10}
The box size is approximately 20 pov units wide.
Rendering time at 800x600, no aa, was 7 hours on a Pentium Pro 200, NT.

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