Hi DirectX experts.
I have found a weird problem.
The ZBuffer is behaving strange when i change the projection matrix.
I experienced these problems while building my engine, so i used one of
the SDK samples to reproduce it. Here is my code (Its pascal):
Problems with ZBuffer and Projection matrix
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Problems with ZBuffer and Projection matrix
Ben Hall (UK)
The projection matrix, along with the view and world matrix, is used to compute transformed vertex position and thus final pixel Z value. The Z value range is given by the projection matrix according to its construction parameters (near, far, fov, width, ...). This range is used for clipping and enable comparing Z values within its limits. Changing one of this values, and especialy swaping from orthogonal to perspective projection, changes Z value range. It means that Z values obtained using different projection matrices cannot be compared.