Cascaded Shadow Map

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http://http.developer.nvidia.com/GPUGems3/gpugems3_ch10.html

http://www.gamedev.net/community/forums/topic.asp?topic_id=399014

http://appsrv.cse.cuhk.edu.hk/~fzhang/pssm_vrcia/

http://hax.fi/asko/PSSM.html

hardware shadow map
http://developer.nvidia.com/object/hwshadowmap_paper.html
http://developer.nvidia.com/forums/index.php?showtopic=34
http://forum.beyond3d.com/showthread.php?t=43182
http://www.gamedev.net/community/forums/topic.asp?topic_id=515318

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