Why don't you try using a skysphere with ambient light set to 1? With Pov
3.1 I can't make it work, but with MegaPov you can really get good results.
You can find MegaPov here: http://nathan.kopp.com/patched.htm
For a good tutorial about MegaPov radiosity (and about lighting without
light sources) check http://www.schunter.etc.tu-bs.de/~chris/eindex.html

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