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混合软影绘制算法

DOI: 10.11834/jig.20130314

Keywords: 实时软影,面光源,物体空间,轮廓边提取,反投影

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Abstract:

实时软影映射算法能够使用一张阴影映射图绘制出复杂动态场景的真实的软影效果。结合物体空间和图像空间的算法,提出一种在物体空间中提取面光源轮廓边的方法;然后利用面光源轮廓边的属性,提出一个在图像空间中确定轮廓边像素走向的方法;最后反投影拟合的轮廓边计算最终的几何可见性。实验结果表明,本文算法减少了提取轮廓边的消耗,提高了绘制效率;增加了拟合轮廓边的精度,提高了绘制效果。

References

[1]  Guennebaud G, Barthe L, Paulin M. Real-time soft shadow mapping by backprojection [C]//The 17th Eurographics Symposium on Rendering. Aire-la-Ville: Eurographics Association Press, 2006: 227-234. [DOI: 10.2312/EGWR/EGSR06/227-234]
[2]  Guennebaud G, Barthe L, Paulin M. High-quality adaptive soft shadow mapping [J]. Computer Graphics Forum, 2007, 26(3): 525-533. [DOI: 10.1111/j.1467-8659.2007.01075.x]
[3]  Zhou W, Liu L, Li H. Fast soft shadow mapping by backprojection[J]. Journal of Computer-Aided Design & Computer Gra-phics, 2011, 23(8): 1285-1293. [周炜,刘浏,李华. 快速反投影软影绘制算法[J]. 计算机辅助设计与图形学学报,2011,23(8):1285-1293.]
[4]  Liu L, Zhou W, Li H. Soft shadow mapping by line fitting[J]. Journal of Computer-Aided Design & Computer Graphics, 2012, 24(12): 1533-1541.[刘浏, 周炜, 李华. 基于轮廓边拟合的软影映射算法[J]. 计算机辅助设计与图形学学报, 2012, 24(12): 1533-1541.]
[5]  Hasenfratz J, Lapierre M, Holzschuch N, et al. A survey of real-time soft shadows algorithms [J]. Computer Graphics Forum, 2003, 22(4): 753-774. [DOI: 10.1111/j.1467-8659.2003.00722.x]
[6]  Crow F C. Shadow algorithms for computer graphics [C]//Proceedings of Annual Conference on Computer Graphics and Interactive Techniques. ACM SIGGRAPH. New York: ACM Press 1977: 242-248[DOI: 10.1145/965141.563901]
[7]  Williams L. Casting curved shadows on curved surfaces [C]//Proceedings of Annual Conference on Computer Graphics and Interactive Techniques. New York: ACM Press, 1978: 270-274.[DOI: 10.1145/965139.807402]
[8]  Akenine-M?ller T, Assarsson U. Approximate soft shadows on arbitrary surfaces using penumbra wedges [C]// Proceedings of the 13th Eurographics Workshop on Rendering. Aire-la-Ville: Eurographics Association Press, 2002: 297-306.
[9]  Assarsson U, Akenine-M?ller T. A geometry-based soft shadow volume algorithm using graphics hardware [J]. ACM Transactions on Graphics, 2003, 22(3): 511-520. [DOI: 10.1145/882262.882300]
[10]  Assarsson U, Dougherty M, Mounier M, et al. An optimized soft shadow volume algorithm with real-time performance [C]// Proceedings of the Eurographics Conference on Graphics Hardware. Aire-la-Ville: Eurographics Association Press, 2003: 33-40.
[11]  Forest V, Barthe L, Paulin M. Realistic soft shadows by penumbra-wedges blending [C]//The 21st Eurographics Symposium on Graphics Hardware. New York: ACM Press, 2006: 39-46. [DOI: 10.1145/1283900.1283907]
[12]  Chan E, Durand F. An efficient hybrid shadow rendering algorithm [C]//The 15th Eurographics Symposium on Rendering. Aire-la-Ville: Eurographics Association Press, 2004: 1-11.
[13]  Wyman C, Hansen C. Penumbra maps: approximate soft shadows in real-time [C]// Proceedings of the 14th Eurographics Workshop on Rendering. Aire-la-Ville: Eurographics Association Press, 2003: 202-207.
[14]  Lv W W, Meng W L, Xue G C, et al. Real-time approximate soft shadow rendering on GPU[J]. Journal of Computer-Aided Design & Computer Graphics, 2009, 21(3):275-288. [吕伟伟,孟维亮,薛盖超,等.基于GPU的近似软影实时绘制[J].计算机辅助设计与图形学学报,2009,21(3):275-288.]
[15]  Blythe D. The Direct3D 10 system [C]//Proceedings of Annual Conference on Computer Graphics and Interactive Techniques. New York: ACM Press, 2006: 724-734. [DOI: 10.1145/1179352.1141947]
[16]  Sun M Y, Lu W W, Liu X H, et al. Approximate soft shadow algorithm based on depth peeling and GPU[J]. Journal of Image & Graphics, 2010, 15(9): 1391-1397. [孙明彦, 吕伟伟, 刘学慧, 等. 深度剥离与GPU结合的近似软影算法[J]. 中国图象图形学报, 2010, 15(9): 1391-1397]
[17]  Atty L, Holzschuch N, Lapierre M, et al. Soft shadow maps: efficient sampling of light source visibility [J]. Computer Gra-phics Forum, 2006, 25(4): 725-742. [DOI: 10.1111/j.1467-8659.2006.00995.x]
[18]  Schwarz M, Stamminger M. Bitmask soft shadows [J]. Computer Graphics Forum, 2007, 26(3): 515-524. [DOI: 10.1111/j.1467-8659.2007.01074.x]
[19]  McGuire M. Observations on silhouette sizes [J]. Journal of Graphics Tools, 2004, 9(1): 1-12. [DOI: 10.1080/10867651.2004.10487594]
[20]  Yang B, Feng J, Guennebaud G, et al. Packet-based hierarchal soft shadow mapping [J]. Computer Graphics Forum, 2009, 28(4): 1121-1130. [DOI: 10.1111/j.1467-8659.2009.01489.x]
[21]  更多...
[22]  Laine S, Aila T, Assarsson U, et al. Soft shadow volumes for ray tracing [C]//Proceedings of Annual Conference on Computer Graphics Interactive Techniques. New York: ACM Press, 2005: 1156-1165. [DOI: 10.1145/1186822.1073327]

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