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How to get the plane equations from projection matrix?

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I need to get all equations of all six planes from projection matrix. Is it possible? How? Edited: Explanation: I'm in clipping stage of my 3d engine. I store all about clipping frustum in matrix, so I wonder if this is enough or I have to store it by easiest way. [edited by - TheVoid on June 2, 2004 11:55:58 AM]

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