Modifying the Projection Matrix to Perform Oblique Near-Plane Clipping Eric Lengyel   â¢Â  May 28, 2004 [Edit: This topic is covered in much greater detail in Foundations of Game Engine Development, Volume 2: Rendering.] The following code modifies the OpenGL projection matrix so that the near plane of the standard view frustum is moved so that it coincides with a given arbitrary plane. The far pla
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