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D3D8X: How do I get the planes of my frustrum?

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I''m using D3DX functions to create my view and projection matricies. I want to get the plane equations for the pyramid of my frustrum, hopefully directly from the projection matrix values. Can somebody please help me with this, or point me to some good information? Obvisouly I''m hoping to be able to perform some quality clipping. I''ve been using projected test points (to see if they are on screen), but my landscapes zap in and out of visibility. It''s possible for none of my test points to be on the screen, yet part of the landscape to still be visible. So I need to perform mathematically accurate clipping now. Thanks! Malachii.

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