Convolution&Exponential shadow map

http://citeseerx.ist.psu.edu/viewdoc/download;jsessionid=52FCE20899526C5E8C5A3EA5D70E4681?doi=10.1.1.146.177&rep=rep1&type=pdf http://research.edm.uhasselt.be/~tmertens/slides/csm.ppt 这哥们是作者之一，非常喜欢这哥们

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