Warping and partitioning for low error shadow maps

Authors:
D. Brandon Lloyd;David Tuft;Sung-eui Yoon;Dinesh Manocha
Affiliations:
University of North Carolina at Chapel Hill;University of North Carolina at Chapel Hill;University of North Carolina at Chapel Hill;University of North Carolina at Chapel Hill
Venue:
EGSR'06 Proceedings of the 17th Eurographics conference on Rendering Techniques
Year:
2006

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Abstract

We evaluate several shadow map algorithms based on warping and partitioning using the maximum perspective aliasing error over the entire view frustum. With respect to our error metric, we show that a range of warping parameters corresponding to several previous warping algorithms have the same error. We also analyze several partitioning schemes to determine which produces the least maximum error using the least number of partitions. Finally, we show how warping and partitioning can be combined for interactive rendering of low error shadows in scenes with a high depth range.