>     pretrace_start 0.08
>     pretrace_end   0.01
>     count 500
>     nearest_count 20
>     error_bound 0.08
>     recursion_limit 4
>     low_error_factor .9
>     gray_threshold 0
>     minimum_reuse 0.015
>     brightness 0.8
>     adc_bailout 0.01/2
>     save_file "museum.rad"

I find that if the surfaces in my scene have a bit of texture, I can get by with
much lower count settings, since a little blotchiness blends in with the texture
anyway.  That's a very low error_bound setting!!

Is there any media in the scene?  I had a scene a while ago in which I had
allowed interaction between media and radiosity, and some strange things
happened.

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