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• W2108032976 abstract "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. This makes intersection cost independent of geometric complexity for rays with large differentials, and simultaneously reduces the variance of occlusion estimates. These two algorithmic improvements result in significant performance gains for soft shadows and ambient occlusion. The prefiltered opacity data depends only on geometry, not lights, and can be computed in linear time based on assumptions about the statistics of aggregate geometry." @default.
• W2108032976 created "2016-06-24" @default.
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• W2108032976 date "2008-08-01" @default.
• W2108032976 modified "2023-10-17" @default.
• W2108032976 title "Raytracing prefiltered occlusion for aggregate geometry" @default.
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• W2108032976 doi "https://doi.org/10.1109/rt.2008.4634616" @default.
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