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How to properly combine the diffuse and specular terms?
However, that's not what you're doing with a diffuse BRDF. A diffuse BRDF is intended to represent the average of all those possible diffusion paths. … Crucially: a diffuse BRDF will already include the aggregate effect of some paths being reflected back into the medium to diffuse further and some passing out immediately. $1 - F_{out}$ is already "baked …