Algorithms in combinatorial geometry
Algorithms in combinatorial geometry
Simulation of simplicity: a technique to cope with degenerate cases in geometric algorithms
ACM Transactions on Graphics (TOG)
A geometric consistency theorem for a symbolic perturbation scheme
Journal of Computer and System Sciences
A solid modelling system free from topological inconsistency
Journal of Information Processing
Efficient Delaunay triangulation using rational arithmetic
ACM Transactions on Graphics (TOG)
Symbolic treatment of geometric degeneracies
Journal of Symbolic Computation
Spatial tessellations: concepts and applications of Voronoi diagrams
Spatial tessellations: concepts and applications of Voronoi diagrams
A General Approach to Removing Degeneracies
SIAM Journal on Computing
Implementation of a randomized algorithm for Delaunay and regular triangulations in three dimensions
Computer Aided Geometric Design
Topology-oriented divide-and-conquer algorithm for Voronoi diagrams
Graphical Models and Image Processing
Guaranteed-quality Delaunay meshing in 3D (short version)
SCG '97 Proceedings of the thirteenth annual symposium on Computational geometry
Tetrahedral mesh generation by Delaunay refinement
Proceedings of the fourteenth annual symposium on Computational geometry
On degeneracy in geometric computations
SODA '94 Proceedings of the fifth annual ACM-SIAM symposium on Discrete algorithms
LEDA: a platform for combinatorial and geometric computing
LEDA: a platform for combinatorial and geometric computing
Journal of the ACM (JACM)
Perturbations and vertex removal in a 3D delaunay triangulation
SODA '03 Proceedings of the fourteenth annual ACM-SIAM symposium on Discrete algorithms
Geometry and Topology for Mesh Generation (Cambridge Monographs on Applied and Computational Mathematics)
Toward superrobust geometric computation
Proceedings of the 2008 ACM symposium on Solid and physical modeling
Perturbations for Delaunay and weighted Delaunay 3D triangulations
Computational Geometry: Theory and Applications
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This paper studies symbolic perturbation schemes in the context of Delaunay meshing in the three-dimensional space. Symbolic perturbation is a general and powerful technique for removing geometric degeneracy. However, a straightforward application of this technique to Delaunay meshing does not work well, because the perturbation generates volume-zero tetrahedra, called slivers, which should not appear in meshes for the finite element method. First we characterize the set of directions in which a point can be perturbed without generating slivers. Next, as an application of this characterization, we construct a graph-theoretic method for finding a sliver-free perturbation. We also show that an ordinary symbolic perturbation cannot avoid slivers for integer-grid points, and point out that there is a generalized type of perturbation that can avoid slivers completely.