I'd like to know how POV-Ray calculates a pixels color, especially if 
both, transmit and filter are non-zero. I'm not looking for equations 
for diffuse or specular illumination (I've already found them), I'm only 
interested how POV-Ray sums up diffuse, specular (highlight), reflected, 
transmitted and filtered light...

Can someone tell me a formula or at which file/method to look in the 
source-code?

Thanks a lot,
-Sascha

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