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Adaptive Volumetric Shadow Maps
Authors:Marco Salvi  Kiril Vidim e  Andrew Lauritzen  Aaron Lefohn
Abstract:We introduce adaptive volumetric shadow maps (AVSM), a real‐time shadow algorithm that supports high‐quality shadowing from dynamic volumetric media such as hair and smoke. The key contribution of AVSM is the introduction of a streaming simplification algorithm that generates an accurate volumetric light attenuation function using a small fixed memory footprint. This compression strategy leads to high performance because the visibility data can remain in on‐chip memory during simplification and can be efficiently sampled during rendering. We demonstrate that AVSM compression closely approximates the ground‐truth correct solution and performs competitively to existing real‐time rendering techniques while providing higher quality volumetric shadows.
Keywords:Computer Graphics [I  3  3]: Three‐Dimensional Graphics and Realism—  Color  shading  shadowing  and texture  Coding and Information Theory (H  1  1) [E  4]: Data compaction and compression—  Bitmap and framebuffer operations
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