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Depending on the mapping situation, we may need to bound an object with a box, a cylinder, or a sphere.  Itís often useful to transform the bounding geometry so its coordinates range between zero and one.  Transformed bounding boxes have coordinates that range from (0,0,0) to (1,1,1).  For a bounding cylinder, we set the circumference to one and the height to one.  For a sphere, we scale the latitude and the longitude so that they both range between zero and one.

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