> Thanks, Alain, that showed some improvement. However I am still getting weird
> artifcats, although more subtle ones. Here is a scene with your suggested
> improvement, however you can still see black rings on the halo of the sphere
> across the plane. I feel like I am missing something in this radiosity
> buisness..

I once had a similar issue with horrible black circles inside a bit of 
furniture I was modelling. That's when someone introduced me to mcpov - 
I've never looked back.

mcpov can be found easily via Google, it's an unbiased patch for POV 
v3.6. That means the resulting render always tends to *exactly* the 
physically correct value over time, no need to fiddle with any radiosity 
parameters or worry about artefacts.

The main downsides are that you can't use any new v3.7 features, 
including multi-core rendering (so you need to run several instances and 
then average the results), and that you cannot use point light sources, 
you need to use physical geometry as light (not such a big issue as it 
sounds). There's also a minor bug with the brightness of pigments, but 
that is easy to compensate for in your code.

Hopefully there will be an unbiased patch for v3.7 soon - I think 
someone is working on it... :-)

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