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Single Sample Soft Shadows

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Has anyone tried to adapt the soft shadows method presented in the paper at http://www.cs.utah.edu/~bes/papers/coneShadow/ to modern hardware? Perhaps not the exact algorithm, but it seems that the idea of using a regular-sized version of the model and also a larger scaled version is rather clever, and somehow applicable to hardware techniques. Shadow buffers, in particular might possibly be modified to use this approach. The problem then seems finding a method to smoothly interpolate the area of the penumbra. Otherwise you could have a constant dark umbra, and a constant slightly less-dark penumbra. This itself might be a nice effect if you are doing NPR like cell-shading, but probably not desirable for photorealism. Perhaps you can share your ideas if you are working on a similar approach.

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