Lecture 13: Global Illumination & Path Tracing (38)
selinafeng

The equation Lo=Le+(RT)(Lo)L_o = L_e + (R \circ T)(L_o) means taking the outgoing light in all directions (LoL_o), transporting it to the next surface that the light will arrive at (TT), and then reflecting off of the surface depending its material properties (RR). For one bounce, we only compose (RTR \circ T) once but we can compose the operators repeatedly to represent many bounces.

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