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Disclaimer: I am assuming that you are implementing a classical Monte Carlo estimator. The Problem Discarding samples will change PDF of your sampling technique. You are cutting off part of the sampled domain where PDF is non-zero, which effectively leads to a trimmed version of the original PDF but implicitly re-normalized so the remaining part integrates ...


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A BRDF is a 4D function, but as we cannot really visualize a 4D function in a comprehensible way, if we want to understand its behavior it can be instructive to fix 2 or 3 of the parameters and graph the others. This kind of graph can be called a "slice". (The mental image I have is like: the BRDF is some oddly shaped fruit, and we're taking a ...


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