Perspectively-Correct Interpolation

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感觉自己对graphics还是没有入门，很多graphics里的基本方法不能自然而然的应用到平时自己写得程序中，感觉没什么长进。比如以前的camera 的up，right vector，到现在的text mapping的方法，在visual hull里都有应用，可是自己还不知道，？

http://www.cs.unc.edu/~geom/HOFF/techrep/persp/persp.html

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