Perspective shadow maps

Marc Stamminger, George Drettakis
2002 ACM Transactions on Graphics  
¡ £ ¢ ¡ ¤ ¢ Figure 1: (Left) Uniform 512x512 shadow map and resulting image. (Right) The same with a perspective shadow map of the same size. Abstract Shadow maps are probably the most widely used means for the generation of shadows, despite their well known aliasing problems. In this paper we introduce perspective shadow maps, which are generated in normalized device coordinate space, i.e., after perspective transformation. This results in important reduction of shadow map aliasing with almost
more » ... no overhead. We correctly treat light source transformations and show how to include all objects which cast shadows in the transformed space. Perspective shadow maps can directly replace standard shadow maps for interactive hardware accelerated rendering as well as in high-quality, offline renderers.
doi:10.1145/566654.566616 fatcat:vw6s7xnk7zb6xbclfch6qrqhhm