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The faces of any object represented by a solid polyhedron completely enclose its volume. For example, the faces have their surface normals pointing outwards and if none of the object's interior is exposed by the near clipping plane and the view point is outside the object, all faces whose surface normals point away from the view point will be completely hidden by closer faces. Back face culling eliminates all invisible back facing faces from view, and is particularly efficient in that no account need be taken of any other faces. The technique is often adopted during visibility determination.
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