[Gmsh] gmsh and FreeFem

[Geordie McBain]

2010/5/20 marco restelli <mrestelli at gmail.com>:
> Hi all,
>   I would be interested in working with gmsh and FreeFem++
> (http://www.freefem.org/ff++/), using FreeFem for the finite element
> computations and gmsh for data visualization and postprocessing. Does
> anybody have suggestions about the most effective way to get data from
> FreeFem into gmsh?

I note your previous post about VTK; FreeFem++ can output VTK, but
then Gmsh only reads the mesh, not the data.

I use Gmsh a lot for FreeFem++ pre- and postprocessing.  The way I get
the data from FreeFem++ into Gmsh is to write an ASCII .msh file,
following the format description at

http://geuz.org/gmsh/doc/texinfo/gmsh.html#MSH-ASCII-file-format

using some FreeFem++ macros I've written, exploiting the techniques
from Section 5.1.4 `Mesh connectivity' of the FreeFem++ manual.  I
attach a modification of FreeFem++ example 3.1 which uses the macros
in writemsh.edp to write the result file membrane.msh for Gmsh.
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