The union of balls and its dual shape

@article{Edelsbrunner1993TheUO,
  title={The union of balls and its dual shape},
  author={Herbert Edelsbrunner},
  journal={Discrete \& Computational Geometry},
  year={1993},
  volume={13},
  pages={415-440}
}
  • H. Edelsbrunner
  • Published 1 July 1993
  • Mathematics
  • Discrete & Computational Geometry
Efficient algorithms are described for computing topological, combinatorial, and metric properties of the union of finitely many spherical balls in ℝd. These algorithms are based on a simplicial complex dual to a decomposition of the union of balls using Voronoi cells, and on short inclusion-exclusion formulas derived from this complex. The algorithms are most relevant in ℝ3 where unions of finitely many balls are commonly used as models of molecules. 

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    Proceedings Computer Graphics International, 2004.
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A new algorithm is presented for computing a polygonal surface from a union of balls that uses the dual shape of the balls to give the resulting surface the correct topology.

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References

SHOWING 1-10 OF 36 REFERENCES

Improved Algorithms for Discs and Balls Using Power Diagrams

On the complexity of computing the homology type of a triangulation

  • Bruce Randall DonaldDavied Renpan Chang
  • Computer Science
    [1991] Proceedings 32nd Annual Symposium of Foundations of Computer Science
  • 1991
The algorithm could be used in computer-aided design to tell whether two finite-element meshes or Bezier-spline surfaces are of the same topological type, and whether they can be embedded in R/sup 3/.

On the shape of a set of points in the plane

A generalization of the convex hull of a finite set of points in the plane leads to a family of straight-line graphs, "alpha -shapes," which seem to capture the intuitive notions of "fine shape" and "crude shape" of point sets.

Elements of algebraic topology

Elements of Algebraic Topology provides the most concrete approach to the subject. With coverage of homology and cohomology theory, universal coefficient theorems, Kunneth theorem, duality in

Algorithms in Combinatorial Geometry

  • H. Edelsbrunner
  • Mathematics
    EATCS Monographs in Theoretical Computer Science
  • 1987
This book offers a modern approach to computational geo- metry, an area thatstudies the computational complexity of geometric problems with an important role in this study.

HOMOTOPY TYPE COMPARISON OF A SPACE WITH COMPLEXES ASSOCIATED WITH ITS OPEN COVERS

1. Introduction. This paper deals with the homotopy type comparison of a space with certain complexes (such as the nerve) associated with suitably "well pieced together" open covers of the space by

Three-dimensional alpha shapes

This article introduces the formal notion of the family of α-shapes of a finite point set in R, a well-defined polytope, derived from the Delaunay triangulation of the point set, with a parameter α ε R controlling the desired level of detail.

INCLUSION-EXCLUSION-BONFERRONI IDENTITIES AND INEQUALITIES FOR DISCRETE TUBE-LIKE PROBLEMS VIA EULER CHARACTERISTICS

Improvements to the classical inclusion-exclusion identity are developed. There are two main results: an abstract combinatoric result and a concrete geometric result. In the abstract result

Simulation of simplicity: a technique to cope with degenerate cases in geometric algorithms

This paper describes a general-purpose programming technique, called Simulation of Simplicity, that can be used to cope with degenerate input data for geometric algorithms and it is believed that this technique will become a standard tool in writing geometric software.

Simulation of simplicity: a technique to cope with degenerate cases in geometric algorithms

A general purpose programming technique, called the Simulation of Simplicity, which can be used to cope with degenerate input data for geometric algorithms, and it is believed that this technique will become a standard tool in writing geometric software.