Tiled Shadow Maps

Authors:
Jukka Arvo
Affiliations:
University of Turku and Turku Centre for Computer Science
Venue:
CGI '04 Proceedings of the Computer Graphics International
Year:
2004

Citing 0
Cited 17

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Abstract

Shadow mapping is a commonly used technique for generatinghard shadows in computer graphics, but the generatedshadow boundaries often suffer from aliasing due tothe discrete nature of the shadow map. In this paper weintroduce a new hardware accelerated algorithm which iscapable of adjusting shadow map sampling rates inside ashadow map of constant size. This is achieved by tiling thelight view and changing the sampling quality according to aheuristical analysis. The implementation is straightforwardon current consumer level graphics hardware and the algorithmcan therefore be included into existing applications.In our test scenarios the cost of the improved image qualitywas moderate, making this method a viable option forincreasing the quality of hard shadows.