Parallel Detection Algorithm of Covered Primitives Based on Geometry Shadow Map

In this paper we present a method to generate high-quality hard shadows in real-time based on geometry shadow map. The method focuses on addressing the aliasing artifacts due to the large number of overlapping primitives which cannot be stored sufficiently and yields error of depth reconstruction. We call it Covered Primitives Parallel Detection algorithm (CPPD). In CPPD, a parallel detection algorithm according to the texel edges is proposed without increasing storage of different triangles. Experiments show that CPPD algorithm can improve the accuracy of depth reconstruction and reduce the jagged shadows effectively.