DISNEY ANIMATION CAREERS
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.