Description: Is put forward for 3 d coordinate and implement the chosen RIP the Ray Intersection computes - Penetration) method. Describes how to choose a specific 3d object using a mouse or related device in a 3d scene that has been rendered to a window. This method for orthogonal projection and perspective projection are effective, relative to the OpenGL's own choice and feedback mechanism, this method both has chosen precision and algorithm efficiency is much higher, a more general solution. - the programs and implemented for three - dimensional coordinates of a selected RIP (Ray - Intersection computes - Penetration) method. Introduce how to have a window of three - dimensional rendering to the scene, using the mouse or the related devices to choose a particular method of three - dimensional object. This method is orthogonal to the projection or perspective the projection are effective, as opposed to OpenGL
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