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In computer graphics, the viewing frustum or view frustum is the region of space which may appear on the screen; it is the field of view of the notional camera. The exact shape of this region varies depending on what kind of camera lens is being simulated, but typically it is a frustum of a rectangular-based pyramid, cut by a near plane (objects closer to the camera than this are not drawn) and possibly by a far plane (objects further away from the camera are not drawn).Viewing frustum culling or view frustum culling is the process of discovering which objects do not appear in the viewing frustum and so need not be drawn. The culling is usually done using bounding volumes surrounding the objects, rather than the objects themselves.
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