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fem_to_mesh.html
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<html>
<head>
<title>
FEM_TO_MESH - Convert finite element mesh data from FEM to MESH format
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
FEM_TO_MESH <br> Convert finite element mesh data from FEM to MESH format
</h1>
<hr>
<p>
<b>FEM_TO_MESH</b>
is a FORTRAN90 program which
reads a pair of FEM files defining the node coordinates and elements
of a finite element mesh, and rewrites the data as a MESH file.
</p>
<p>
The program can convert 2D meshes of triangles, or 3D meshes of
tetrahedrons.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>fem_to_mesh</b> prefix
</blockquote>
where <i>prefix</i> is the file name prefix, so that:
<ul>
<li>
<i>prefix</i><b>_nodes.txt</b> is a file containing node coordinates;
</li>
<li>
<i>prefix</i><b>_elements.txt</b> is a file listing the nodes
forming each element;
</li>
<li>
<i>prefix</i><b>_boundary_node_mask.txt</b> is a file listing a "0" for
each interior node and a "1" for each boundary node; (This file can
be created by the <b>triangulation_boundary_nodes</b> or
<b>tet_mesh_boundary</b> programs.)
</li>
<li>
<i>prefix</i><b>.mesh</b> is the name of the MESH file to be created.
</li>
</ul>
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this
web page are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>FEM_TO_MESH</b> is available in
<a href = "../../cpp_src/fem_to_mesh/fem_to_mesh.html">a C++ version</a> and
<a href = "../../f_src/fem_to_mesh/fem_to_mesh.html">a FORTRAN90 version</a> and
<a href = "../../m_src/fem_to_mesh/fem_to_mesh.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../f_src/fem_to_tec/fem_to_tec.html">
FEM_TO_TEC</a>,
a FORTRAN90 program which
converts FEM models into TECPLOT ASCII files.
</p>
<p>
<a href = "../../data/fem2d/fem2d.html">
FEM2D</a>,
a data directory which
contains examples of 2D FEM files,
text files that describe a 2D finite element geometry
and associated nodal values;
</p>
<p>
<a href = "../../data/fem3d/fem3d.html">
FEM3D</a>,
a data directory which
contains examples of 3D FEM files,
three text files that describe a 3D finite element geometry
and associated nodal values.
</p>
<p>
<a href = "../../f_src/ice_to_mesh/ice_to_mesh.html">
ICE_TO_MESH</a>,
a FORTRAN90 program which
reads a NETCDF file containing an ICE dataset and rewrites the
information as a MESH file.
</p>
<p>
<a href = "../../data/mesh/mesh.html">
MESH</a>,
a data directory which
contains examples of MESH files, which can be used to define the geometry
of a finite element mesh in 2D or 3D, using triangles, quadrilaterals,
tetrahedrons or hexahedrons.
</p>
<p>
<a href = "../../f_src/tet_mesh_boundary/tet_mesh_boundary.html">
TET_MESH_BOUNDARY</a>,
a FORTRAN90 program which
returns the nodes and faces of the boundary of a tetrahedral mesh,
which themselves form a 3D triangular mesh or "TRI_SURFACE".
</p>
<p>
<a href = "../../f_src/triangulation_boundary_nodes/triangulation_boundary_nodes.html">
TRIANGULATION_BOUNDARY_NODES</a>,
a FORTRAN90 program which
reads data defining a triangulation, determines which nodes
lie on the boundary, and writes their coordinates to a file.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Pascal Frey,<br>
MEDIT: An interactive mesh visualization software,<br>
Technical Report RT-0253,<br>
Institut National de Recherche en Informatique et en Automatique,<br>
03 December 2001.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "fem_to_mesh.f90">fem_to_mesh.f90</a>, the source code.
</li>
<li>
<a href = "fem_to_mesh.sh">fem_to_mesh.sh</a>,
BASH commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<b>ELL</b> is a 2D L-shaped region, with a grid of 65 nodes
and 96 elements of order 3 triangles.
<ul>
<li>
<a href = "../../data/fem2d/ell_nodes.txt">ell_nodes.txt</a>
</li>
<li>
<a href = "../../data/fem2d/ell_elements.txt">ell_elements.txt</a>
</li>
<li>
<a href = "../../data/fem2d/ell_elements.png">ell_elements.png</a>,
an image of the triangulation.
</li>
<li>
<a href = "../../data/fem2d/ell_boundary_node_mask.txt">ell_boundary_node_mask.txt</a>
</li>
<li>
<a href = "../../data/mesh/ell.mesh">ell.mesh</a>, the MESH file.
</li>
</ul>
</p>
<p>
<b>P01</b> is 3D FEM data for a rectangular channel of dimensions
3x1x1 physical units, using 584 nodes and 2568 tetrahedral elements.
<ul>
<li>
<a href = "../../data/fem3d/p01_nodes.txt">p01_nodes.txt</a>,
defines the FEM nodes.
</li>
<li>
<a href = "../../data/fem3d/p01_elements.txt">p01_elements.txt</a>,
defines the FEM elements.
</li>
<li>
<a href = "../../data/fem3d/p01.png">p01.png</a>,
an image of the mesh.
</li>
<li>
<a href = "../../data/fem3d/p01_boundary_node_mask.txt">p01_boundary_node_mask.txt</a>
</li>
<li>
<a href = "../../data/mesh/p01.mesh">p01.mesh</a>, the MESH file.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for FEM_TO_MESH.
</li>
<li>
<b>CH_CAP</b> capitalizes a single character.
</li>
<li>
<b>CH_EQI</b> is a case insensitive comparison of two characters for equality.
</li>
<li>
<b>CH_TO_DIGIT</b> returns the integer ( kind = 4 ) value of a base 10 digit.
</li>
<li>
<b>FEM_DATA_READ</b> reads data from a set of FEM files.
</li>
<li>
<b>FEM_HEADER_PRINT</b> prints the header to set of FEM files.
</li>
<li>
<b>FEM_HEADER_READ</b> reads the sizes of arrays in a set of FEM files.
</li>
<li>
<b>FEM_TO_MESH_HANDLE</b> copies data from a FEM dataset to a MESH data set.
</li>
<li>
<b>FILE_COLUMN_COUNT</b> counts the number of columns in the first line of a file.
</li>
<li>
<b>FILE_NAME_INC</b> increments a partially numeric filename.
</li>
<li>
<b>FILE_ROW_COUNT</b> counts the number of rows in a file.
</li>
<li>
<b>GET_UNIT</b> returns a free FORTRAN unit number.
</li>
<li>
<b>I4MAT_DATA_READ</b> reads data from an I4MAT file.
</li>
<li>
<b>I4MAT_HEADER_READ</b> reads the header from an I4MAT.
</li>
<li>
<b>MESH_WRITE</b> writes sizes and data to a MESH file.
</li>
<li>
<b>R8MAT_DATA_READ</b> reads data from an R8MAT file.
</li>
<li>
<b>R8MAT_HEADER_READ</b> reads the header from an R8MAT file.
</li>
<li>
<b>S_TO_I4</b> reads an integer ( kind = 4 ) value from a string.
</li>
<li>
<b>S_TO_I4VEC</b> reads an integer ( kind = 4 ) vector from a string.
</li>
<li>
<b>S_TO_R8</b> reads an R8 from a string.
</li>
<li>
<b>S_TO_R8VEC</b> reads an R8VEC from a string.
</li>
<li>
<b>S_WORD_COUNT</b> counts the number of "words" in a string.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../f_src.html">
the FORTRAN90 source codes</a>.
</p>
<hr>
<i>
Last revised on 04 December 2010.
</i>
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