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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Sander wrote:
> 
> 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:
> [...]

Try increasing count (default is 35 IIRC) and maybe nearest_count.

If things become too slow or it uses very much memory i would reduce
recursion_limit, 2 or 3 instead of 4 is often not much worse.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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In article <3AAE0EDC.DBB2D6A6@gmx.de>, Christoph Hormann says...
> 
> Try increasing count (default is 35 IIRC) and maybe nearest_count.
> 
> If things become too slow or it uses very much memory i would reduce
> recursion_limit, 2 or 3 instead of 4 is often not much worse.
> 
> Christoph

Thanks for your quick answer: I will do some experiments with those 
settings. Chris Huff pointed me to the adverse effect of very bright 
objects in the scene - which I had indeed! That I will also take care 
of.
-- 
Regards,  Sander

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