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Sub-pixel shadow mapping

Published: 21 July 2013 Publication History

Abstract

The limited resolution of shadow maps may result in erroneous shadowing, yielding artificially jagged edges (Figure 1) and temporally crawling shadows even using perspective optimization techniques. Dai et al. [2008] propose an explicit storage of geometry within shadow map texels to avoid aliasing. Each texel stores the coordinates of the closest triangle only, potentially leading to false negatives in the intersection computation while incurring large memory consumption. These artifacts are reduced by intersecting the triangles stored in numerous neighboring texels, resulting in significant performance hit while still missing some intersections.
We introduce Sub-Pixel Shadow Maps (SPSM) for real-time shadow mapping with sub-pixel precision. Our technique is based on the storage of a fixed-size partial representation of the scene geometry using conservative rasterization, combined with an original reconstruction of shadow edges.

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References

[1]
Dai, Q., Yang, B., and Feng, J. 2008. Reconstructable geometry shadow maps. In Proceedings of I3D, 4:1--4:1.
[2]
Hasselgren, J., Akenine-Möller, T., and Ohlsson, L. 2005. Conservative rasterization. In GPU Gems 2, M. Pharr, Ed. Addison-Wesley, 677--690.

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  • (2014)Exact reachability analysis for planning skew-line needle arrangements for automated brachytherapy2014 IEEE International Conference on Automation Science and Engineering (CASE)10.1109/CoASE.2014.6899376(524-531)Online publication date: Aug-2014

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cover image ACM Conferences
SIGGRAPH '13: ACM SIGGRAPH 2013 Talks
July 2013
25 pages
ISBN:9781450323444
DOI:10.1145/2504459
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Published: 21 July 2013

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  • (2014)Exact reachability analysis for planning skew-line needle arrangements for automated brachytherapy2014 IEEE International Conference on Automation Science and Engineering (CASE)10.1109/CoASE.2014.6899376(524-531)Online publication date: Aug-2014

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