Inhalt des Dokuments
Preprint 519-1996
Combinatorial Optimization & Graph Algorithms group (COGA-Preprints)- Title
- Minimum Strictly Convex Quadrangulations of Convex Polygons
- Authors
- Publication
- an extended abstract appeared in the Proceedings of the 13th Annual ACM Symposium on Computational Geometry, SoCG'97, June 4-6, 1997, Nice, France, pages 193-202
- Classification
-
not available
- Keywords
-
not available
- Abstract
-
We present a linear-time algorithm that decomposes a convex polygon conformally into a minimum number of strictly convex quadrilaterals. Moreover, we characterize the polygons that can be decomposed without additional vertices inside the polygon, and we present a linear-time algorithm for such decompositions, too. As an application, we consider the problem of constructing a minimum conformal refinement of a mesh in the three-dimensional space, which approximates the surface of a workpiece. The latter problem has resulted from a cooperation with an engineering company that sells CAD packages. We have proved that this problem is strongly NP-hard, and we present a linear-time algorithm with a constant approximation ratio of 4.
- Source
- Download as [ps.Z]
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