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     摘要: D3DFVF_XYZ和D3DFVF_XYZRHW有什么區(qū)別？以前好像沒有仔細思考過，只是見到Beginning DirectX9中如是說：The RHW value, which stands for Reciprocal of Homogeneous W[1], tells Direct3D that the vertices that are being used are already in screen coordinates. This value is normally used in fog and clipping calculations and should be set to 1.0.   閱讀全文