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Lecture 13: Global Illumination and Path Tracing (37)

Could someone explain the operator K? I understand that we want to calculate the light that is being reflected and transmitted at a certain point but how exactly do the two operators work on L_o?


First T works on Lo to transform it into Li, then R works on the result of previous transformation to give the final function. Operators are just linearly transforming functions in the same way as matrices linearly transform vectors.


^ exactly yeah, and to add on to that, by definition, K is a composition operator, which means that it is actually composed of at least two linear operators that can be expressed separately.

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