Ben Chambers schrieb:
> 
>  From a quick look at Wikipedia, it seems that POV-Ray almost implements 
> bidirectional pathtracing as it is.

No, POV-Ray radiosity only traces rays in direction camera -> light 
source and not the other way round.  Also POV-Ray uses an irradiance 
cache to speed up computations and to avoid high frequency noise.  This 
only works reasonably well for diffuse light transport.  So path tracing 
would allow rendering some lighting situations that can't be 
realistically done in POV-Ray right now but OTOH it would be much less 
efficient for most cases which can be handled by POV-Ray radiosity.

-- Christoph

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