Octree-based Generation of Hexahedral Element Meshes
Schneiders, R., R. Schindler and F. Weiler
5th International Meshing Roundtable, Sandia National Laboratories, pp.205-216, October 1996
We present a new algorithm for the generation of hexahedral element meshes. The algorithm starts with an octree discretization of the interior of the input object which is converted to a conforming hexahedral element mesh. Then the isomorphism technique  is used to adapt the mesh to the object boundary.
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