For anyone out of the loop, his paper "The Rendering Equation" is very readable. https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.63.1402 https://cites

For anyone out of the loop, his paper "The Rendering Equation" is very readable. https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.63.1402 https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.63....