[Gmsh] gmsh and deal.ii

[gmsh at praveen.e4ward.com]

For 2-d grids, the normal (which is in the third direction) may not be
oriented in the same direction for all cells. The vertex ordering may be cw
for some cells and ccw for others. You can check this by showing the
normals. See this thread

http://www.geuz.org/pipermail/gmsh/2011/006213.html

praveen

On Wed, Sep 14, 2011 at 11:15 PM, Vijay S. Mahadevan <vijay.m at gmail.com>wrote:

> It might be appropriate to send this to the Deal.II mailing list since
> the exception is specific to their parser/mesh data structures. Also,
> try to replicate the problem with a small mesh and attach the test
> case if you want some quick help. Without any idea about your geometry
> or the meshing options you used, this will be hard to debug over
> email.
>
> Also I noticed that you said Gmsh v1.0 ?? You should really update to
> the latest version.
>
> Vijay
>
> On Wed, Sep 14, 2011 at 12:25 PM, Javier Munoz <josejmcriollo at gmail.com>
> wrote:
> > I'm trying import into deal.ii a mesh generated with Gmsh. The only thing
> I know
> > is that deal.ii doesn't accept triangular elements from imported files.
> >
> > I construct my grid in Gmsh and at the end I use the command 'Recombine
> Surface'
> > to recombine the triangular elements into quads. I save the file in Gmsh
> V1.0
> > and I make sure that all the elements were quads, i.e. all element types
> were 3
> > (4 node quadrangle).
> >
> > Then, when I tried to import the mesh into deal.ii and it gave the error:
> >
> > terminate called after throwing an instance of
> > 'dealii::StandardExceptions::ExcInternalError'
> >  what():  --------------------------------------------------------
> > An error occurred in line <642> of file
> > </home/zerpiko/FEM/deal.II/source/grid/grid_reordering.cc> in function
> static
> > void dealii::GridReordering<dim,
> > spacedim>::invert_all_cells_of_negative_grid(const
> > std::vector<dealii::Point<spacedim> >&, std::vector<dealii::CellData<dim>
> >&)
> > [with int dim = 2, int spacedim = 2]
> > The violated condition was:
> >    n_negative_cells==0 || n_negative_cells==cells.size()
> > The name and call sequence of the exception was:
> >    ExcInternalError()
> > Additional Information:
> > (none)
> > --------------------------------------------------------
> >
> > I'm not sure what was my mistake. Any clue?
> >
> >
> > _______________________________________________
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> > gmsh at geuz.org
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> >
>
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