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From Odwiki

A deep shadow map is a shadow map which is able to encode opacity values at multiple depths. Each pixel's depth information is specially compressed to converse disk space and stored in an ascending opacity, making looking at total opacity at a specified depth very quick.

Motion blur, transparency and even depth of field can be encoded in deep shadow maps.

Deep shadow maps are based on work done by Eric Veach (formerly of Pixar) and further information can be found at: http://graphics.stanford.edu/papers/deepshadows/

Mantra supports Deep Shadow Maps using the RAT file format.

Also See

• DeepCameraMap