In computer graphics and games, an important problem is to discover if two objects are intersecting. For performance reasons, we often perform two gross estimates between objects to determine if they intersect before testing whether the small parts of the objects intersect.-In computer graphics and games, an important problem is to discover if two objects are

intersecting. For performance reasons, we often perform two gross estimates between

objects to determine if they intersect before testing whether the small parts of the

objects intersect.