Decompositions and boundary coverings of non-convex fat polyhedra

  • Authors:
  • Mark de Berg;Chris Gray

  • Affiliations:
  • Department of Computing Science, TU Eindhoven, PO Box 513, 5600 MB Eindhoven, The Netherlands;Department of Computer Science, TU Braunschweig, Germany

  • Venue:
  • Computational Geometry: Theory and Applications
  • Year:
  • 2010

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Abstract

We show that any locally-fat (or (@a,@b)-covered) polyhedron with convex fat faces can be decomposed into O(n) tetrahedra, where n is the number of vertices of the polyhedron. We also show that the restriction that the faces are fat is necessary: there are locally-fat polyhedra with non-fat faces that require @W(n^2) pieces in any convex decomposition. Furthermore, we show that if we want the tetrahedra in the decomposition to be fat themselves, then their number cannot be bounded as a function of n in the worst case. Finally, we obtain several results on the problem where we want to only cover the boundary of the polyhedron, and not its entire interior.