Can anybody explain to me how the sampling parameters for media actually 
work? This is one of the few areas where POV-Ray's documentation seems a 
little unclear. (In particular, apparently there are 3 sampling 
methods... but I'm really fuzzy on how they work.)

In particular, the documentation says that the default setting for 
invertals is 10. However, when I put that into my scene, the render 
slows down *drastically*. (And the image quality improves.) What's going on?

Also, do the sampling parameters still have an effect when you're using 
media photons? Do the photon sampling parameters override that? Do the 
media parameters control how much POV-Ray samples the photon map it's 
already built? How does this part work??

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