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Variance Soft Shadow Mapping

Yang, BG; Dong, Z; Feng, JQ; Seidel, HP; Kautz, J; (2010) Variance Soft Shadow Mapping. COMPUT GRAPH FORUM , 29 (7) 2127 - 2134. 10.1111/j.1467-8659.2010.01800.x.

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We present variance soft shadow mapping (VSSM) for rendering plausible soft shadow in real-time. VSSM is based on the theoretical framework of percentage-closer soft shadows (PCSS) and exploits recent advances in variance shadow mapping (VSM). Our new formulation allows for the efficient computation of (average) blocker distances, a common bottleneck in PCSS-based methods. Furthermore, we avoid incorrectly lit pixels commonly encountered in VSM-based methods by appropriately subdividing the filter kernel. We demonstrate that VSSM renders high-quality soft shadows efficiently (usually over 100 fps) for complex scene settings. Its speed is at least one order of magnitude faster than PCSS for large penumbra.

Type: Article
Title: Variance Soft Shadow Mapping
DOI: 10.1111/j.1467-8659.2010.01800.x
URI: http://discovery.ucl.ac.uk/id/eprint/407993
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