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Computer Graphics

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  • $\begingroup$ You could add a third sampling strategy that samples in the general direction of that bright light (e.g., a spherical Gaussian) and compute the MIS weights accordingly. This will remain unbiased. $\endgroup$ Commented Nov 21, 2024 at 19:36
  • $\begingroup$ There can be more than two strategies. For example, use one-sample model with three different sampling methods: (1) BRDF sampling (2) precomputed inverse transform importance sampling of the env-map (in PBR-book) (3) cosine-weighted sampling: you know the normal of the hit position, then sample around the normal using cosine-weighted sampling. Method (1) (3) will ensure to have front-facing samples, while method (2) can yield high contribution samples. $\endgroup$ Commented Jan 1 at 4:52