I set up a page concerning hemispherical lighting in POV-Ray. The URL is
http://roy.gmxhome.de/
If you are interested, please have a look at it and share your opinions,
ideas, critics or whatever.
Thanks.
Roy

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It reminds me of a picture posted some time ago in the binary group of a
tulip, according to the comment it used about 100 lights evenly distributed
in a sphere form. I guess the result is pretty similar, but I do like your
result.

Maybe you could try that as well and see what the differences are, result
wise and rendering time wise.


Thomas

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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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Kari Kivisalo wrote:

> area_light<1000,0,0>,<0,1000,0>,20,20 adaptive 2}

I got the rendering time down to 4 minutes with: 10,10 jitter adaptive 1.
I was trying to match the overall shadow quality with the rad image.


_____________
Kari Kivisalo

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I didn't try megapov yet, which has better radiosity support. With povray
3.1g area lights are much better than radiosity. But your results in quality
and rendering time are very impressive. I'll try megapov, if I have time.
After all, I prefer creating beautiful images to doing experimental
renderings. But the latter is the basis for the former :-(

Roy

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