in <3aeef957@news.povray.org> Geoff Wedig wrote:

> Yeah.  Maybe try it with no light sources at all, and ambient set
> to 0. That would give a good idea exactly how much radiosity is
> doing in different cases.
> 

 Is this what you mean. Radiosity data gathering passage, one white 
light_source and a sky:
pigment {gradient y color_map {[0, rgb 0.6] [1, rgb 1]}}
 Rendering passage no light, no sky.

Ingo

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