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Reference Papers

Microfacet BSDFs / GGX

  • Walter et al., 2007 — Microfacet Models for Refraction through Rough Surfaces EGSR 2007. Introduces the GGX (Trowbridge-Reitz) normal distribution and Smith G1 for it.

  • Heitz, 2014 — Understanding the Masking-Shadowing Function in Microfacet-Based BRDFs JCGT 2014. Definitive analysis of Smith G1/G2; derives the height-correlated G2 used here. https://jcgt.org/published/0003/02/03/

  • Heitz, 2018 — Sampling the GGX Distribution of Visible Normals JCGT 2018. VNDF importance sampling — samples only microfacets visible from V, reducing variance at grazing angles. https://jcgt.org/published/0007/04/01/