Publisher's Synopsis
Excerpt from Generalized Voronoi Diagrams for a Ladder: II. Efficient Construction of the Diagram
The boundary of a sheet is composed of edges, linked together by (voronoi) vertices. Roughly speaking, a free (resp. Semi-free) edge is a connected 1-dimensional set of free (resp. Semi-free) placements simultaneously nearest to three (resp. Two) distinct objects in S. Similarly a free (resp. Semi-free) vertex is a free (resp. Semi-free) placement simultaneously nearest to four (resp. Three) disfinct objects in S (see [cey] for refinements and spedal cases of this definin'on).
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