With about 100 objects in the scene it seems to be slower than 1 bounce
radiosity. The area light scene took 9 minutes to render while radiosity
handled it in 2 minutes.

I used this for the area light scene.

  #declare lc=SkyColor/2.8
  #declare lb=light_source{<0,500,-500> color lc
area_light<1000,0,0>,<0,1000,0>,20,20 adaptive 2}
  object{lb}
  object{lb rotate 90*y}
  object{lb rotate 180*y}
  object{lb rotate 270*y}
  object{lb translate -500*y rotate 90*x translate 500*y }

and this for the radiosity version

global_settings{
  assumed_gamma 1.0
  ini_option "+qr"
  radiosity{
    pretrace_start 0.04
    pretrace_end 0.02/4
    count 500
    recursion_limit 1
    nearest_count 3
    error_bound 1/4
  }
}

http://www.pp.htv.fi/kkivisal/hemi.jpg
http://www.pp.htv.fi/kkivisal/rad.jpg

_____________
Kari Kivisalo

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