Subdivides a root box for an OCTREE tile — like deriveBoxQuadtree but ALL THREE half-axes shrink and the center shifts along the z (vertical) axis too (an octree subdivides height as well as the horizontal extent).
box
Subdivides a root
boxfor an OCTREE tile — like deriveBoxQuadtree but ALL THREE half-axes shrink and the center shifts along the z (vertical) axis too (an octree subdivides height as well as the horizontal extent).