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OpenGL Direct3D and OpenGL Rendering

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In a project I am working on, I need to write renderers for OpenGL and Direct3D8. These renderers need to produce identical results. So far, I''ve learned to use the right-handed D3D functions instead of the left-handed ones to get the coordinate syutem to match up, but the perspective matrix seems to still cause problems. Using gluPerspective and the equivalent D3DX***RH function, The OpenGL view seems to be zoomed in a bit closer on the object. Does anyone know what could be causing and this?

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