TET_MESH_Q2L is a FORTRAN90 program which reads information describing a tet mesh of a set of points using 10-node ("quadratic") triangles, and creates a 4-node ("linear") tet mesh.
The same nodes are used, but each 10-node tetrahedron is broken up into 8 smaller 4-node tetrahedrons.
tet_mesh_q2l prefixwhere prefix is the common file prefix:
The input and output files use the simple TABLE format; comment lines begin with a "#" character. Otherwise, each line of the file contains one set of information, either the coordinates of a node (for a node file), or the indices of nodes that make up a tetrahedron, (for a tetrahedron file).
The input file tetras.txt contains the tetrahedron information for the 10-node tet mesh. Each line contains the indices of 10 nodes that form a tetrahedron, in a particular order. The first 4 indices are the vertices. Subsequent nodes can be described by the pair of vertices they lie between, as follows:
1 2 3 4 (1+2) (1+3) (1+4) (2+3) (2+4) (3+4)
The output file tetras.l2q.txt contains the tetrahedron information for the 4-node tet mesh.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
TET_MESH_Q2L is available in a C++ version and a FORTRAN90 version and a MATLAB version.
CVT_TET_MESH, a FORTRAN90 library which uses CVT methods to compute a tet mesh in a region.
GEOMPACK, a FORTRAN90 library which contains a routine DTRIS3 that can compute the tet mesh for a set of 3D points, as well as the adjacency information.
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, a FORTRAN90 library which includes a variety of routines for working with tetrahedral meshes.
TET_MESH_DISPLAY, a MATLAB program which reads the node and tetra files defining a tet mesh and displays a wireframe image.
TET_MESH_DISPLAY_OPENGL, a C++ program which reads a tet mesh and displays the nodes and edges using OpenGL.
TET_MESH_L2Q, a FORTRAN90 program which takes a 4-node tet mesh and makes a 10-node tet mesh, by inserting new nodes.
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_QUALITY, a FORTRAN90 program which computes the "quality" of a mesh.
TET_MESH_RCM, a FORTRAN90 program which takes a 4-node or 10-node tet mesh and relabels the nodes to reduce the bandwidth of the corresponding adjacency matrix.
TET_MESH_REFINE, a FORTRAN90 program which can refine a tet mesh.
TET_MESH_TET_NEIGHBORS, a FORTRAN90 program which computes the tetrahedral adjacency information.
TET_MESH_VOLUMES, a FORTRAN90 program which computes the volume of each tetrahedron in a tet mesh;
TETRAHEDRON_PROPERTIES, a FORTRAN90 program which computes properties of a given tetrahedron.
TETRAHEDRONS, a dataset directory which contains examples of tetrahedrons;
You may copy data for an example problem:
You can go up one level to the FORTRAN90 source codes.