Precompute the front/back test for a bounding sphere. Tags all nodes that the sphere falls into with a NF_IsBack tag (if the sphere is entirely in back of the node), a NF_IsFront tag (if the sphere is entirely in front of the node), or neither (if the sphere is split by the node). This only affects nodes that the sphere falls in. Thus, it is not necessary to perform any cleanup after precomputi
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