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/usr/bin/msh2geo is in rheolef 6.5-1+b1.

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The actual contents of the file can be viewed below.

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#!/bin/sh
#
# This file is part of Rheolef.
#
# Copyright (C) 2000-2009 Pierre Saramito 
#
# Rheolef is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# Rheolef is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Rheolef; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# -------------------------------------------------------------------------

#Prog:msh2geo
#NAME: @code{msh2geo} - convert gmsh mesh in geo format
#@cindex mesh
#@toindex msh2geo
#@pindex geo
#@fiindex @file{.msh} gmsh mesh
#@fiindex @file{.geo} mesh
#@toindex @code{gmsh}
#SYNOPSIS:
#@example
#  msh2geo [-zr|-rz] @var{input}[.msh] > @var{output}.geo
#@end example
#
#DESCRIPTION:
#Convert a gmsh @file{.msh} into @file{.geo} one.
#The output goes to standart output.
#See the @code{gmsh} documentation for a detailed description
#of the @file{.mshcad} input file for @code{gmsh}.
#EXAMPLES:
#@example
#  gmsh -2 toto.mshcad -o toto.msh
#  msh2geo toto.msh > toto.geo
#
#  gmsh -2 -order 2 toto.mshcad -o toto2.msh
#  msh2geo toto2.msh > toto2.geo
#@end example
#COORDINATE SYSTEM OPTION:
#Most of rheolef codes are coordinate-system independant.
#The coordinate system is specified in the geometry file @file{.geo}.
#@table @code
#@cindex axisymmetric coordinate system
#@item -zr
#@itemx -rz
#       the 2d mesh is axisymmetric: @code{zr} (resp. @code{rz}) stands when the symmetry is related
#       to the first (resp. second) coordinate.
#@end table
#NOTES:
#Pk triangle, when k>=5, may have internal nodes renumbered: from the
#gmsh documentation:
#  @example
#  The nodes of a curved element are numbered in the following order:
#
#    the element principal vertices;
#    the internal nodes for each edge;
#    the internal nodes for each face;
#    the volume internal nodes. 
#
#  The numbering for face and volume internal nodes is recursive,
#  i.e., the numbering follows that of the nodes of an embedded face/volume.
#  The higher order nodes are assumed to be equispaced on the element. 
#  @end example
#
#In rheolef, internal triangle nodes are numbered from left to right and then
#from bottom to top. The numbering differ for triangle when k >= 5.
#Thus, @code{msh2geo} fix the corresponding internal nodes numbering during the 
#conversion.
#
#Pk tetrahedrons and hexaedrons in gmsh and rheolef has not the same edge-node order
#nd orientation.
#E.g. for tetrahedrons, edges 13 and 23 should be swaped
#and reoriented as 32 and 31.
#Thus, @code{msh2geo} fix the corresponding internal nodes numbering.
#
#TODO:
#Fix for P3-tetra: swap edges orientations for 3,4,5
#and swap faces 1 and 2. Check P4(T) for face orientation.
#Perform face visualisation with gnuplot face fill.
#
#See also hexa edges orient and faces numbers and orient.
#
#Check that node are numbered by vertex-node, then edge-node, then face(tri,qua)-node and then volume(T,P,H)-node.
#Otherwise, renumber all nodes.
#
#Support for high order >= 6 element ? not documented in gmsh, but gmsh supports it at run
#End:

opts=""
if test $# -eq 0; then
   echo "msh2geo: usage: msh2geo [-rz|-zr] file.msgh > file.geo" 1>&2
   exit 1
fi
if test x"$1" = x"-rz" -o x"$1" = x"-zr"; then
  opts=$1
  shift
fi
msh_file=$1
basename=`basename ${msh_file}`
basename=`expr ${msh_file} : '\(.*\).msh' \| ${msh_file}`
if test ! -f ${msh_file}; then
   echo "msh2geo: \"${msh_file}\" file not found" 1>&2
   exit 1
fi
pkglibdir=`rheolef-config --pkglibdir 2>/dev/null`
$pkglibdir/msh2geo_int $opts < ${msh_file} | geo -geo -upgrade -
status=$?
if test $status -ne 0; then
    echo "msh2geo: failed." >&2
    exit 1
fi