Yes, thanks for pointing that out. I so easily forget to mention things that seem obvious to me :(

Ahah, not good for a programmer :D

I'm joking, thanks for suggesting that book, I don't know much about this stuff but i might actually read it!

Tell me about it :P

Since a physically-based ray tracer involves a lot of different theory and math, it can be quite interesting even if your not in it for the actual ray tracing. For example there's sampling low-discrepancy sequences, kd-trees and other bounding volumes, color representation and conversion etc.