Separating-Plane Perspective Shadow Mapping

Abstract

Abstract.This paper proposes a real-time hybrid solution between standard shadow mapping and any of the current perspective shadow mapping based methods. Existing methods are known to have undersampling problems. At little extra cost we combine two methods to minimize undersampling errors. This is done by computing a plane equation which 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.

A Survey of Real‐Time Hard Shadow Mapping Methods

“…One special case of such a combination is to use one uniform shadow map and one perspective shadow map and calculate a plane equation that separates areas where the one or the other provides the best quality [Mik07]. Figure 18 shows the overall error (here called storage factor), which takes into account error in both shadow map…”

“…One special case of such a combination is to use one uniform shadow map and one perspective shadow map and calculate a plane equation that separates areas where the one or the other provides the best quality [Mik07].…”