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shadow volumes Zfail help

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i am new to computer graphics and i am currently researching shadowing for my final year computer graphics project where i compare the implementation of a few shadowing techniques in opengl i am doing my research part of the assignment and currently i understand the theory behind the zpass method of shadow volumes but i dont understand the theory behind the zfail method, nvidia have been rather good with the documentation they provide and i cant recommend their material enough but they seem to only touch on zfail rather than explain it if anyone could help it would be a great help also i am currently researching planar shadows, z-buffer shadows, shadow mapping and shadow volumes if anyone has any others that would be worth my while looking at that they would also help a great deal Thanks

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Guest Anonymous Poster
Hun Yen Kwoon's article has a pretty good explanation on z-fail, and it can be found on GD at http://www.gamedev.net/columns/hardcore/shadowvolume/page2.asp.

you might also want to go to the GD articles at http://www.gamedev.net/reference/ and enter something like "shadows z-fail" into the search box to see if there are any good forum discussion threads, which i'm sure there are.

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