This paper proposes a real-time solution that is a hybrid between standard shadow mapping and any of the current methods based on perspective shadow mapping. Existing methods are known to have aliasing problems. At little extra cost, we combine two methods to minimize aliasing errors. This is done by computing a plane equation that separates the two resulting shadow maps to get the best possible area-based sampling density. An additional property of this separation plane is that objects entirely on one side of the plane only need to be rendered into one map.
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