TET_MESH
Routines for a Tet Mesh
TET_MESH
is a C++ library which
constructs, describes, or modifies a mesh of tetrahedrons.
Linear and Quadratic Meshes
The simplest tet mesh, which we term an order 4
or linear mesh, uses four points to define each tetrahedron.
A second type of mesh, known as an order 10 or quadratic
mesh, uses ten points.
While an order 4 mesh can naturally be constructed directly from
most sets of data points, a mesh of order 10 is not usually
constructed directly from the data; at least in the simplest case,
one wants the 6 extra nodes to be the midpoints of the sides
determined by the 4 vertices.
Thus, an order 10 tet mesh is typically generated in two steps:
-
generate an order 4 mesh, in which every tetrahedral vertex
comes from a user data point;
-
generate an order 10 mesh from the order 4 mesh, in which
the new midside points are not user data points, but rather
averages of pairs of tetrahedral vertices.
Licensing:
The computer code and data files described and made available on this web page
are distributed under
the GNU LGPL license.
Languages:
TET_MESH is available in
a C++ version and
a C++ version and
a FORTRAN90 version and
a MATLAB version.
Related Programs:
CVT_TET_MESH,
a FORTRAN90 library which
uses CVT methods to compute a tet mesh in a region.
GEOMETRY,
a C++ library which
includes a number of routines for
making computations involving tetrahedrons.
GEOMPACK,
a C++ library which
contains a routine
DTRIS3 that can compute the tet mesh for a set of 3D points,
as well as the adjacency information.
KEAST,
a C++ library which
defines a number of quadrature rules
for a tetrahedron.
NCC_TETRAHEDRON,
a C++ library which
defines Newton-Cotes closed quadrature
rules on a tetrahedron.
NCO_TETRAHEDRON,
a C++ library which
defines Newton-Cotes open quadrature
rules on a tetrahedron.
QUADRATURE_RULES_TET,
a dataset directory which
contains triples of files defining various quadrature
rules on tetrahedrons.
TABLE_TET_MESH,
a FORTRAN90 program which
can compute the tet mesh for a given set of points.
TEST_TET_MESH,
a FORTRAN90 library which
defines a few test regions for the generation
of a tet mesh.
TET_MESH_BOUNDARY,
a C++ program which
returns the nodes and faces of the boundary of a tetrahedral mesh,
which themselves form a 3D triangular mesh or "TRI_SURFACE".
TET_MESH_DISPLAY,
a MATLAB program which
can read in the
node and tetra files defining a tet mesh and display a wireframe
image.
TET_MESH_DISPLAY_OPENGL,
a C++ program which
can read in the
node and tetra files defining a tet mesh and display a wireframe
image.
TET_MESH_L2Q,
a C++ program which
converts a linear to quadratic
tet mesh.
TET_MESH_ORDER4,
a directory which
contains a description and
examples of a tet mesh using order 4 elements.
TET_MESH_ORDER10,
a directory which
contains a description and
examples of a tet mesh using order 10 elements.
TET_MESH_Q2L,
a C++ program which
converts a quadratic to linear tet mesh.
TET_MESH_QUAD,
a C++ program which
estimates the integral of a function over a region defined by a tetrahedral mesh.
TET_MESH_QUALITY,
a C++ program which
computes the quality of a tet mesh.
TET_MESH_RCM,
a C++ program which
takes a tet mesh and
relabels the nodes to reduce the bandwidth of the
corresponding adjacency matrix.
TET_MESH_REFINE,
a C++ program which
can refine a tet mesh.
TET_MESH_TET_NEIGHBORS,
a C++ program which
computes the tetrahedral adjacency information.
TET_MESH_VOLUMES,
a C++ program which
computes the volume of each tetrahedron in a tet mesh;
Reference:
-
Herbert Edelsbrunner,
Geometry and Topology for Mesh Generation,
Cambridge, 2001,
ISBN: 0-521-79309-2,
LC: QA377.E36.
-
Barry Joe,
GEOMPACK - a software package for the generation of meshes
using geometric algorithms,
Advances in Engineering Software,
Volume 13, Number 5, 1991, pages 325-331.
-
Anwei Liu, Barry Joe,
Quality Local Refinement of Tetrahedral Meshes Based
on 8-Subtetrahedron Subdivision,
Mathematics of Computation,
Volume 65, Number 215, July 1996, pages 1183-1200.
-
Per-Olof Persson, Gilbert Strang,
A Simple Mesh Generator in MATLAB,
SIAM Review,
Volume 46, Number 2, June 2004, pages 329-345.
Source Code:
Examples and Tests:
List of Routines:
-
I4_MAX returns the maximum of two I4's.
-
I4_MIN returns the minimum of two I4's.
-
I4_SWAP switches two I4's.
-
I4_UNIFORM returns a scaled pseudorandom I4.
-
I4COL_COMPARE compares columns I and J of an I4COL.
-
I4COL_SORT_A ascending sorts the columns of an I4COL.
-
I4COL_SORT2_A ascending sorts the elements of each column of an I4COL.
-
I4COL_SORTED_UNIQUE_COUNT counts unique elements in an I4COL.
-
I4COL_SWAP swaps two columns of an I4COL.
-
I4I4_SORT_A ascending sorts a pair of I4's.
-
I4I4I4_SORT_A ascending sorts a triple of I4's.
-
I4MAT_TRANSPOSE_PRINT prints an I4MAT, transposed.
-
I4MAT_TRANSPOSE_PRINT_SOME prints some of an I4MAT, transposed.
-
I4VEC_PRINT prints an I4VEC.
-
I4VEC_SUM sums the entries of an I4VEC.
-
I4VEC_ZERO zeroes an I4VEC.
-
R4_ABS returns the absolute value of an R4.
-
R4_NINT returns the nearest integer to an R4.
-
R8_HUGE returns a "huge" R8.
-
R8_MAX returns the maximum of two R8's.
-
R8_MIN returns the minimum of two R8's.
-
R8_SWAP switches two R8's.
-
R8_UNIFORM_01 returns a unit pseudorandom R8.
-
R8MAT_DET_4D computes the determinant of a 4 by 4 R8MAT.
-
R8MAT_MV multiplies a matrix times a vector.
-
R8MAT_PRINT prints an R8MAT, with an optional title.
-
R8MAT_PRINT_SOME prints some of an R8MAT.
-
R8MAT_SOLVE uses Gauss-Jordan elimination to solve an N by N linear system.
-
R8MAT_TRANSPOSE_PRINT prints an R8MAT, transposed.
-
R8MAT_TRANSPOSE_PRINT_SOME prints some of an R8MAT, transposed.
-
R8MAT_UNIFORM_01 fills a double precision array with unit pseudorandom values.
-
R8VEC_CROSS_3D computes the cross product of two vectors in 3D.
-
R8VEC_IS_NONNEGATIVE is true if all entries in an R8VEC are nonnegative.
-
R8VEC_IS_ZERO is true if the entries in an R8VEC are all zero.
-
R8VEC_LENGTH returns the Euclidean length of a R8VEC
-
R8VEC_MAX returns the maximum element in an R8VEC.
-
R8VEC_MEAN returns the mean of a R8VEC.
-
R8VEC_MIN returns the minimum element in an R8VEC.
-
R8VEC_PRINT prints an R8VEC.
-
R8VEC_SUM returns the sum of an R8VEC.
-
R8VEC_UNIFORM_01 returns a unit pseudorandom R8VEC.
-
R8VEC_VARIANCE returns the variance of a double vector.
-
R8VEC_ZERO zeroes a real vector.
-
S_LEN_TRIM returns the length of a string to the last nonblank.
-
SORT_HEAP_EXTERNAL externally sorts a list of items into ascending order.
-
TET_MESH_NEIGHBOR_TETS determines tetrahedron neighbors.
-
TET_MESH_NODE_ORDER: determines the order of nodes.
-
TET_MESH_ORDER4_ADJ_COUNT counts the number of nodal adjacencies.
-
TET_MESH_ORDER4_BOUNDARY_FACE_COUNT counts the number of boundary faces.
-
TET_MESH_ORDER4_EDGE_COUNT counts the number of edges.
-
TET_MESH_ORDER4_EXAMPLE_SET sets an example linear tet mesh.
-
TET_MESH_ORDER4_EXAMPLE_SIZE sizes an example linear tet mesh.
-
TET_MESH_ORDER4_REFINE_COMPUTE computes a refined order 4 tet mesh
-
TET_MESH_ORDER4_REFINE_SIZE sizes a refined order 4 tet mesh.
-
TET_MESH_ORDER4_TO_ORDER10_COMPUTE computes a quadratic tet mesh from a linear one.
-
TET_MESH_ORDER4_TO_ORDER10_SIZE sizes a quadratic tet mesh from a linear one.
-
TET_MESH_ORDER10_EXAMPLE_SET sets an example quadratic tet mesh.
-
TET_MESH_ORDER10_EXAMPLE_SIZE sizes an example quadratic tet mesh.
-
TET_MESH_ORDER10_TO_ORDER4_COMPUTE linearizes a quadratic tet mesh.
-
TET_MESH_ORDER10_TO_ORDER4_SIZE sizes a linear tet mesh from a quadratic one.
-
TET_MESH_QUAD approximates an integral over a tet mesh.
-
TET_MESH_QUALITY1 returns a tet mesh quality factor.
-
TET_MESH_QUALITY2 returns a tet mesh quality factor.
-
TET_MESH_QUALITY3 returns a tet mesh quality factor.
-
TET_MESH_QUALITY4 returns a tet mesh quality factor.
-
TET_MESH_QUALITY5 returns a tet mesh quality factor.
-
TET_MESH_SEARCH_DELAUNAY searches a Delaunay tet mesh for a point.
-
TET_MESH_SEARCH_NAIVE naively searches a tet mesh.
-
TETRAHEDRON_BARYCENTRIC returns the barycentric coordinates of a point.
-
TETRAHEDRON_CIRCUMSPHERE_3D computes the circumsphere of a tetrahedron in 3D.
-
TETRAHEDRON_EDGE_LENGTH_3D returns edge lengths of a tetrahedron in 3D.
-
TETRAHEDRON_INSPHERE_3D finds the insphere of a tetrahedron in 3D.
-
TETRAHEDRON_ORDER4_PHYSICAL_TO_REFERENCE maps physical points to reference points.
-
TETRAHEDRON_ORDER4_REFERENCE_TO_PHYSICAL maps reference points to physical points.
-
TETRAHEDRON_QUALITY1_3D: "quality" of a tetrahedron in 3D.
-
TETRAHEDRON_QUALITY2_3D: "quality" of a tetrahedron in 3D.
-
TETRAHEDRON_QUALITY3_3D computes the mean ratio of a tetrahedron.
-
TETRAHEDRON_QUALITY4_3D computes the minimum solid angle of a tetrahedron.
-
TETRAHEDRON_REFERENCE_SAMPLE samples points in the reference tetrahedron.
-
TETRAHEDRON_SAMPLE returns random points in a tetrahedron.
-
TETRAHEDRON_VOLUME_3D computes the volume of a tetrahedron in 3D.
-
TIMESTAMP prints the current YMDHMS date as a time stamp.
You can go up one level to
the C++ source codes.
Last revised on 20 August 2009.