Geometric and combinatorial properties of well-centered triangulations in three and higher dimensions
An n-simplex is said to be n-well-centered if its circumcenter lies in its interior. We introduce several other geometric conditions and an algebraic condition that can be used to determine whether a simplex is n-well-centered. These conditions, together with some other observations, are used to des...
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Published in | Computational geometry : theory and applications Vol. 46; no. 6; pp. 700 - 724 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
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01.08.2013
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Abstract | An n-simplex is said to be n-well-centered if its circumcenter lies in its interior. We introduce several other geometric conditions and an algebraic condition that can be used to determine whether a simplex is n-well-centered. These conditions, together with some other observations, are used to describe restrictions on the local combinatorial structure of simplicial meshes in which every simplex is well-centered. In particular, it is shown that in a 3-well-centered (2-well-centered) tetrahedral mesh there are at least 7 (9) edges incident to each interior vertex, and these bounds are sharp. Moreover, it is shown that, in stark contrast to the 2-dimensional analog, where there are exactly two vertex links that prevent a well-centered triangle mesh in R2, there are infinitely many vertex links that prohibit a well-centered tetrahedral mesh in R3. |
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AbstractList | An n-simplex is said to be n-well-centered if its circumcenter lies in its interior. We introduce several other geometric conditions and an algebraic condition that can be used to determine whether a simplex is n-well-centered. These conditions, together with some other observations, are used to describe restrictions on the local combinatorial structure of simplicial meshes in which every simplex is well-centered. In particular, it is shown that in a 3-well-centered (2-well-centered) tetrahedral mesh there are at least 7 (9) edges incident to each interior vertex, and these bounds are sharp. Moreover, it is shown that, in stark contrast to the 2-dimensional analog, where there are exactly two vertex links that prevent a well-centered triangle mesh in R 2 , there are infinitely many vertex links that prohibit a well-centered tetrahedral mesh in R 3 . An n-simplex is said to be n-well-centered if its circumcenter lies in its interior. We introduce several other geometric conditions and an algebraic condition that can be used to determine whether a simplex is n-well-centered. These conditions, together with some other observations, are used to describe restrictions on the local combinatorial structure of simplicial meshes in which every simplex is well-centered. In particular, it is shown that in a 3-well-centered (2-well-centered) tetrahedral mesh there are at least 7 (9) edges incident to each interior vertex, and these bounds are sharp. Moreover, it is shown that, in stark contrast to the 2-dimensional analog, where there are exactly two vertex links that prevent a well-centered triangle mesh in R2, there are infinitely many vertex links that prohibit a well-centered tetrahedral mesh in R3. |
Author | Ramos, Edgar A. Guoy, Damrong Zharnitsky, Vadim VanderZee, Evan Hirani, Anil N. |
Author_xml | – sequence: 1 givenname: Evan surname: VanderZee fullname: VanderZee, Evan organization: Argonne National Laboratory, Lemont, IL, USA – sequence: 2 givenname: Anil N. surname: Hirani fullname: Hirani, Anil N. email: hirani@illinois.edu organization: Department of Computer Science, University of Illinois at Urbana-Champaign, 201 N. Goodwin Avenue, Urbana, IL 61801, USA – sequence: 3 givenname: Damrong surname: Guoy fullname: Guoy, Damrong organization: Synopsys Inc., Mountain View, CA, USA – sequence: 4 givenname: Vadim surname: Zharnitsky fullname: Zharnitsky, Vadim organization: Department of Mathematics, University of Illinois at Urbana-Champaign, Urbana, IL, USA – sequence: 5 givenname: Edgar A. surname: Ramos fullname: Ramos, Edgar A. organization: Escuela de Matemáticas, Universidad Nacional de Colombia, Colombia |
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Cites_doi | 10.1137/060669073 10.1016/0045-7825(73)90019-4 10.1137/0729003 10.1137/090748214 10.1073/pnas.95.15.8431 10.1007/s00454-006-1244-0 10.1142/S0129054102001059 10.1145/2382585.2382588 10.1107/S0567739473000963 10.1016/j.cad.2012.10.038 10.1109/ISVD.2007.26 |
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SubjectTerms | Acute triangulations Algebra Circumcentric dual Combinatorial analysis Computational geometry Constrictions Discrete exterior calculus Finite element method Links Mesh generation Triangles Triangulation |
Title | Geometric and combinatorial properties of well-centered triangulations in three and higher dimensions |
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