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Journal Article

Variance Soft Shadow Mapping


Dong,  Zhao
Computer Graphics, MPI for Informatics, Max Planck Society;


Seidel,  Hans-Peter       
Computer Graphics, MPI for Informatics, Max Planck Society;


Kautz,  Jan
Computer Graphics, MPI for Informatics, Max Planck Society;

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Yang, B., Dong, Z., Feng, J., Seidel, H.-P., & Kautz, J. (2010). Variance Soft Shadow Mapping. Computer Graphics Forum, 29(7), 2127-2134. doi:10.1111/j.1467-8659.2010.01800.x.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-1793-7
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 highquality 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.