Christopher James Huff wrote:

>>Actually, I suppose you could program POV-Ray to try to illuminate an 
>>entire scene with photon maps. I imagine that would go real slow, 
>>compute a lot of photons you can't see, and generally not look so great. 
> 
> 
> What you describe is "global photons". Possible, can very accurately 
> simulate actual physical effects which are otherwise difficult or 
> impossible, but extremely memory hungry and not really efficient. 
> Multi-pass techniques might be useful...shoot a few million photons, do 
> a render pass with the radius of effect of each photon limited (get a 
> really dim, spotty picture), and continue to shoot photons and add the 
> results together until you get a final picture. Jitter each pass 
> slightly, and you get some antialiasing or focal blur in the bargain.
> 
> 
> 

Seems that WinOsi does something similar : http://www.winosi.onlinehome.de/

But indeed, it is very slow... But then it's supposed to be very 
accurate as well...

-- 
Vincent

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