Straight skeletons and mitered offsets of nonconvex polytopes

F. Aurenhammer, G. Walzl

Research output: Contribution to journalArticlepeer-review


We give a concise definition of mitered offset surfaces for nonconvex polytopes in ℝ3, along with a proof of existence and a discussion of basic properties. These results imply the existence of 3D straight skeletons for general nonconvex polytopes. The geometric, topological, and algorithmic features of such skeletons are investigated, including a classification of their constructing events in the generic case. Our results extend to the weighted setting, to a larger class of polytope decompositions, and to general dimensions. For (weighted) straight skeletons of an n-facet polytope in ℝd, an upper bound of O(nd) on their combinatorial complexity is derived. It relies on a novel layer partition for straight skeletons, and improves the trivial bound by an order of magnitude for d≥3.
Original languageEnglish
Pages (from-to)743-801
JournalDiscrete & Computational Geometry
Issue number3
Publication statusPublished - 2016


  • 3D straight skeleton
  • Mitered offset surface
  • Arrangement of planes


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