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Raytracing Prefiltered Occlusion For Aggregate Geometry

Raytracing Prefiltered Occlusion for Aggregate Geometry

IEEE Symposium on Interactive Raytracing 2008

Dylan Lacewell, Brent Burley, Solomon Boulos

We prefilter occlusion of aggregate geometry, e.g., foliage or hair, storing local occlusion as a directional opacity in each node of a bounding volume hierarchy (BVH). During intersection, we terminate rays early at BVH nodes based on ray differential, and composite the stored opacities.