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\subsection{Unidimensional mesh with {\tt gmsh}}
% =============================================
The simplest unidimensional mesh is a line:
\fiindex{\filesuffix{.msh} gmsh mesh}%
\fiindex{\filesuffix{.mshcad} gmsh geometry}%
\pindex{gmsh}%
\exindex{line.mshcad}%
\cindex{geometry!line}%
\myexamplenocxx{line.mshcad}%
The mesh generation command writes:
\begin{verbatim}
gmsh -1 line.mshcad -format msh2 -o line.msh
\end{verbatim}
\pindex{msh2geo}%
\fiindex{\filesuffix{.geo} mesh}%
Then, the conversion to \filesuffix{.geo} format and the visualization:
\begin{verbatim}
msh2geo line.msh > line.geo
geo line
\end{verbatim}
% =============================================
\subsection{Bidimensional mesh with {\tt gmsh}}
% =============================================
\label{sec-gmsh}%
\begin{figure}[htb]
\mbox{} \hspace{-1cm}
\begin{tabular}{ccc}
\includegraphics[width=7cm]{square-gmsh-geo.pdf} &
\hspace{0.56cm}
\includegraphics[width=8cm]{cube-gmsh-geo.png} &
\stereoglasses
\end{tabular}
\caption{Visualization of the \code{gmsh} meshes \file{square.geo} and \file{cube.geo}.}
\label{fig-gmsh-meshes}
\end{figure}
We first create a \reffile{square.mshcad} file:
\cindex{geometry!square}%
\myexamplenocxx{square.mshcad}%
This is an uniform mesh with element size \var{h} = 0.1.
We refer to the \code{gmsh} documentation~\cite{gmsh} for the
complete file format description.
Next, enter the mesh generator commands:
\begin{verbatim}
gmsh -2 square.mshcad -format msh2 -o square.msh
\end{verbatim}
Then, enter the translation command:
\pindex{msh2geo}%
\fiindex{\filesuffix{.geo} mesh}%
\begin{verbatim}
msh2geo square.msh > square.geo
\end{verbatim}
This command creates a \file{square.geo} file.
Look at the mesh via the command:
\begin{verbatim}
geo square
\end{verbatim}
Remark that the domain names, defined in the .mshcad file,
are included in the gmsh .msh input file and are
propagated in the .geo by the format conversion.
% =============================================
\subsection{Tridimensional mesh with {\tt gmsh}}
% =============================================
First, create a \reffile{cube.mshcad} file:
\exindex{cube.mshcad}%
\cindex{geometry!cube}%
\myexamplenocxx{cube.mshcad}%
Next, enter the mesh generator commands:
\begin{verbatim}
gmsh -3 cube.mshcad -format msh2 -o cube.msh
\end{verbatim}
Then, enter the translation command:
\begin{verbatim}
msh2geo cube.msh > cube.geo
\end{verbatim}
This command creates a \file{cube.geo} file.
Look at the mesh via the command:
\begin{verbatim}
geo cube
geo cube.geo -cut
\end{verbatim}
The second command allows one to see inside the mesh.
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