> Seriously, "physically correct" would mean it accounts for polarized 
> surfaces and handles interference fringes and diffraction, and traces 
> the rays of light from the light source to the camera, rather than 
> starting at the camera. :-)
> 

OK, let's say more physically correct then ;-) I don't know, something 
that conserves energy, for a start :-)

Starting at the camera and not at the light source is no big deal to me. 
What matters is finding a path joining the light to the camera. Starting 
from the camera or the light is purely a matter of what's more practical...

-- 
Vincent

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