I simply never before had the courage to use radiosity in the scenes I'm 
working on: interiors of a complex building. The big surprise was the 
nice natural-looking lighting of the scene and the not much longer 
render time. But:
I see artifacts on the lit ceiling and I could not find anything about 
this although I seem to remember having read something about this 
problem. The image is in p.b.I. and the radiosity setting is:
global_settings
  { 
  assumed_gamma 2.2 
  ambient_light color rgb 0.1
  ini_option "+QR"
  radiosity
    {
    recursion_limit 4
    brightness 1.0
    normal on
    error_bound 0.2
    pretrace_start 0.08
    pretrace_end 0.02
    }
  }

Possibly more data are required to see what is wrong, but I hesitate to 
burden anybody with the spaghetti code I use... ;(

Question: what could be wrong?
-- 
Regards,  Sander

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