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Some questions about programming

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Hello ! I'm very new to DirectX and I have a lot of questions ... I. cannot understand why we use foloat for pointing Pixel on screen(for example CUSTOMVERTEX (D3DFVF_XYZ)) II.Is it good to begin game programming with DirectX 9 ?

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I. You're not specifying a pixel on screen, you're specifying a coordinate in 3D space.
II. Definitely not. You need a good grasp of C++, and a reasonable understanding of Win32 before even attempting DirectX stuff, otherwise you'll just keep running into problems.

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