Tuesday, November 29, 2011

Spotted: Colored stochastic shadow maps

Handling colored translucency in real time. 

Colored stochastic shadow maps

Morgan McGuire, Eric Enderton

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., α-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.

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