Computing a canonical polygonal schema of an orientable triangulated surface

  • Authors:
  • Francis Lazarus;Michel Pocchiola;Gert Vegter;Anne Verroust

  • Affiliations:
  • CNRS and University of Poitiers, France;Dépt d'Informatique, Ecole Normale Supérieure, Paris, France;Dept. of Math. and CS, University of Groningen, The Netherlands;INRIA Rocquencourt, France

  • Venue:
  • SCG '01 Proceedings of the seventeenth annual symposium on Computational geometry
  • Year:
  • 2001

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Abstract

A closed orientable surface of genus $g$ can be obtained by appropriat e identification of pairs of edges of a $4g$-gon (the polygonal schema). The identified edges form $2g$ loops on the surface, that are disjoint except for their common end-point. These loops are generators of both the fundamental group and the homology group of the surface. The inverse problem is concerned with finding a set of $2g$ loops on a triangulated surface, such that cutting the surface along these loops yields a (canonical) polygonal schema. We present two optimal algorithms for this inverse problem. Both algorithms have been implemented using the CGAL polyhedron data structure.