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Game Development Dictionary


Carmack's Reverse


Refers to a modification to Heidmann's original stenciled shadow volumes technique generally attributed to John Carmack, although others came up with the same modification at about the same time. Rather than incrementing and decrementing for the front and back faces (respectively) when the depth test passes, the method increments for back faces and decrements for front faces when the depth test fails. This prevents shadow volumes from being clipped by the near plan, but introduces the problem of them being clipped by the far plane.

You can find out more about the algorithm here.


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