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OpenGL implementation document
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Referred to each book on getting started with OpenGL OpenGL Select mode, it uses a method makes it possible to obtain the geometry of the current mouse click. This way is simple, first adjust the Projection matrix, allowing you through from a square near the mouse click (size can be set) see in the world. And then start drawing, and when each one draws, you will see it. If you see, then you select geometry. More specific procedures can be found in the relevant books.
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