Perspective Shadow Maps
1University of North Carolina at Chapel Hill
perspective shadow map (LogPSM) parameterization can reduce perspective
aliasing artifacts for both point and directional light sources. The
parameterization is a simple combination of a perspective projection with
a logarithmic transformation. that produces tighter bounds on the aliasing
error in the view frustum than other parameterizations. We extend three
existing shadow map algorithms to use our parameterization. Compared with
competing algorithms, LogPSMs produce significantly less aliasing error.
Equivalently, for the same error, LogPSMs require significantly less
storage and bandwidth. With hardware support, LogPSMs would have
performance similar to the algorithms upon which they are based.
Practical logarithmic rasterization for low-error shadow maps
ACM SIGGRAPH/EUROGRAPHICS symposium on Graphics Hardware, pp.17-24, 2007
Logarithmic perspective shadow maps
Transactions on Graphics, vol. 27, no. 4, October 2008
My dissertation has more details not included in these papers.