学步园

Shadow Mapping

http://www.codesampler.com/oglsrc/oglsrc_8.htm

http://www1.cs.columbia.edu/~ravir/6160/papers/shadowmaps.ppt

Stencil Shadow
Volume

http://www.codesampler.com/oglsrc/oglsrc_8.htm

http://www.niksula.cs.hut.fi/~jkainula/pdfs/stencilshadows.pdf