marky.addison schrieb:

> what I need are differential equations that POV-Ray uses.
> Can you send me some link. Thanks!

Could you be somewhat more specific?

At its core, raytracing is about vector math, not differential 
equations. There are pretty likely some underlying differential 
equations involved for stuff like the fresnel formula used in 
refraction, or the phong / blinn-phong highlights, but someone else 
wrecked their brains earlier to come up with quite simple equations, 
with all integrals or derivatives either solved or approximated already.

As for radiosity, it does perform some integration, but it does so 
numerically using a monte-carlo-like approach.

I really wouldn't know off the top of my head where you expect to be 
differential equations involved.

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