Hardware-Accelerated Colored Stochastic Shadow Maps

"Hardware-Accelerated Colored Stochastic Shadow Maps"
Morgan McGuire (NVIDIA), in NVIDIA Technical Report NVR-2010-003, May 2010
Research Area: 3D Graphics
Author(s): Morgan McGuire (NVIDIA)
Date: May 2010

This paper extends the stochastic transparency algorithm that models partial coverage to also model wavelength-varying transmission. It then applies this to the problem of casting shadows between any combination of opaque, colored transmissive, and partially covered (i.e., alpha-matted) surfaces in a manner compatible with existing hardware shadow mapping techniques. Colored Stochastic Shadow Maps have a similar resolution and performance profile to traditional shadow maps, however they require a wider filter in colored areas to reduce hue variation.