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Improving Direct Lighting Material Occlusion - Part 2

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Pablo Zurita

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Improving Direct Lighting Material Occlusion - Part 2 is a March 2026 irradiance.ca article by Pablo Zurita on microsurface-aware micro-shadowing for direct lighting.

Building on a prior micro-occlusion post, it frames geometric normals, roughness microsurfaces, and a visibility cone, then proposes VNDF-based micro-shadowing that tests visible microfacet normals against the cone and weights by G2/G1 under Smith GGX, including anisotropic notes and HLSL-oriented listings. It relates the approach to micro-occlusion maps and roughness-aware diffuse BRDFs that share a microsurface with specular.

It is for advanced real-time shading engineers familiar with microfacet theory and VNDF sampling who already read part 1.

The post is free HTML with notation tables, diagrams, and shader-style listings as part of a short series.

It is useful for improving contact occlusion on rough surfaces where geometric-only micro-shadowing looks flat.