> @Dave : I am using r3510. Could the problem arise from the fact that
> ex1.C uses the function mesh.read( ) .... is there something special
> that needs to be done for Gmsh
> meshes?
I did a loop over the elements in the mesh you provided and the element
subdomain IDs are set correctly, so you should be able to use the mesh
with no problems in a libmesh program. For example, try reading in the
mesh, and then doing:
MeshBase::const_element_iterator el =
mesh.active_local_elements_begin();
const MeshBase::const_element_iterator end_el =
mesh.active_local_elements_end();
for ( ; el != end_el; ++el)
{
const Elem* elem = *el;
const unsigned int sbd_id = elem->subdomain_id();
std::cout << "Element subdomain id = " << sbd_id << std::endl;
}
However, I never added any code to write out subdomain IDs when writing
out a gmsh file from libMesh, so that's why you didn't see the
appropriate physical information in out.msh. But yes, we should write
out the subdomain info when writing out .msh files...
- Dave
>
> On Wed, Oct 28, 2009 at 4:56 AM, Roy Stogner <[email protected]
> <mailto:[email protected]>> wrote:
>
>
> On Wed, 28 Oct 2009, Arvind Ajoy wrote:
>
> I am trying to read in a simple mesh created using Gmsh, which has
> two Physical regions. I use the example programme ex1.cc to read
> the .msh file, and write it out as another .msh file, i.e
> ./ex1 -d 2
> in.msh out.msh.
>
> I find that the output of ex1.cc mentions n_subdomains()=1, though
> there are two physical regions.
>
>
> Interesting...
>
> MeshBase::n_subdomains() has been around since 2005, when Ben added
> it (presumably to Mesh, back then?). MeshBase::set_n_subdomains()
> appears to be an easy accessor that Derek
> added earlier this year... but other than a little overloading in the
> BoundaryInfo::sync() method, I can't find anywhere that subdomain
> counts are actually getting *set* rather than just copied around!
>
> I suppose a typical use case is for the user code to set subdomain
> ids, but we do support them in Exodus, GMSH, Nemesis, and XDR I/O...
> yet none of that code seems to update the total mesh id count.
>
> Ben, Derek, anyone else know what I'm missing? It seems as if
> updating MeshBase::_n_sbd ought to be a standard part of
> prepare_for_use(), but isn't...
> ---
> Roy
>
>
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