TET_MESH_TO_XML
Convert Tetrahedral Mesh to DOLFIN XML File

TET_MESH_TO_XML is a FORTRAN90 program which reads a file of node coordinates and a file of elements defined by node indices, which define a tetrahedral mesh of a 3D region in terms of 4, 10, or 20-node tetrahedrons, and creates a corresponding DOLFIN XML mesh file.

DOLFIN is the C++ interface to FENICS.

Usage:

tet_mesh_to_xml prefix

• 'prefix'_nodes.txt contains the node coordinates,
• 'prefix'_elements.txt contains the element definitions.
• 'prefix'.xml will contain the DOLFIN XML mesh file.

Licensing:

The computer code and data files made available on this web page are distributed under the GNU LGPL license.

Languages:

TET_MESH_TO_XML is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

DOLFIN-CONVERT, a Python program which can convert mesh file from Gmsh, MEDIT, METIS or SCOTCH format to an XML format suitable for use by DOLFIN or FENICS, by Anders Logg.

TET_MESH, a FORTRAN90 library which includes a variety of routines for working with tetrahedral meshes.

TET_MESH_L2Q, a FORTRAN90 program which takes a 4-node tet mesh and makes a 10-node tet mesh.

TET_MESH_ORDER4, a dataset directory which contains a description and examples of a tet mesh using order 4 elements.

TET_MESH_ORDER10, a dataset directory which contains a description and examples of a tet mesh using order 10 elements.

TET_MESH_ORDER20, a dataset directory which contains examples of order 20 tetrahedral meshes.

TET_MESH_Q2L, a FORTRAN90 program which takes a 10-node tet mesh and makes a 4-node tet mesh.

TRIANGULATION_TO_XML, a FORTRAN90 program which reads information defining a trinagulation, namely a file of node coordinates and a file of elements defined by node indices, and creates a corresponding DOLFIN XML mesh file.

XML, a data directory which contains examples of XML files, a standard, general datafile format.

Reference:

1. Anders Logg, Kent-Andre Mardal, Garth Wells,
   Automated Solution of Differential Equations by the Finite Element Method: The FEniCS Book,
   Lecture Notes in Computational Science and Engineering,
   Springer, 2011,
   ISBN13: 978-3642230981,
   LC:

Source Code:

• tet_mesh_to_xml.f90, the source code.
• tet_mesh_to_xml.sh, commands to compile the source code.

Examples and Tests:

• mesh_nodes.txt, the nodes for the 4-node tet mesh.
• mesh_elements.txt, the elements for the 4-node tet mesh.
• mesh.msh, the DOLFIN XML mesh file version of the data.

List of Routines:

• MAIN is the main program for TET_MESH_TO_XML.
• CH_CAP capitalizes a single character.
• CH_EQI is a case insensitive comparison of two characters for equality.
• CH_TO_DIGIT returns the value of a base 10 digit.
• FILE_COLUMN_COUNT counts the number of columns in the first line of a file.
• FILE_ROW_COUNT counts the number of row records in a file.
• GET_UNIT returns a free FORTRAN unit number.
• I4MAT_DATA_READ reads data from an I4MAT file.
• I4MAT_HEADER_READ reads the header from an I4MAT.
• I4MAT_TRANSPOSE_PRINT_SOME prints some of the transpose of an I4MAT.
• MESH_BASE_ZERO ensures that the element definition is zero-based.
• R8MAT_DATA_READ reads data from an R8MAT file.
• R8MAT_HEADER_READ reads the header from an R8MAT file.
• R8MAT_TRANSPOSE_PRINT_SOME prints some of an R8MAT, transposed.
• S_TO_I4 reads an I4 from a string.
• S_TO_I4VEC reads an I4VEC from a string.
• S_TO_R8 reads an R8VEC from a string.
• S_TO_R8VEC reads an R8VEC from a string.
• S_WORD_COUNT counts the number of "words" in a string.
• TIMESTAMP prints the current YMDHMS date as a time stamp.
• XML_WRITE writes the triangulation data as a DOLFIN XML mesh file.

You can go up one level to the FORTRAN90 source codes.