A Pivoting Algorithm for Convex Hulls and Vertex Enumeration of Arrangements and Polyhedra

We present a new pivot-based algorithm which can be used with minor modification for the enumeration of the facets of the convex hull of a set of points, or for the enumeration of the vertices of an arrangement or of a convex polyhedron, in arbitrary dimension. The algorithm has the following properties: (a) No additional storage is required beyond the input data; (b) The output list produced is free of duplicates; (c) The algorithm is extremely simple, requires no data structures, and handles all degenerate cases; (d) The running time is output sensitive for non-degenerate inputs; (e) The algorithm is easy to efficiently parallelize. For example, the algorithm finds the v vertices of a polyhedron in Rd defined by a nondegenerate system of n inequalities (or dually, the v facets of the convex hull of n points in Rd , where each facet contains exactly d given points) in time O(ndv) and O(nd) space. The v vertices in a simple arrangement of n hyperplanes in Rd can be found in O(n2 d...

• Type: Conference
• Year: 1991
• Where: COMPGEOM
• Authors: David Avis, Komei Fukuda
• Keywords: Algorithms, COMPGEOM 1991, Convex Hull, Convex Polyhedron, Discrete Geometry