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[Anders Logg <question150226@xxxxxxxxxxxxxxxxxxxxx>]

Question #150226 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/150226

    Status: Open => Answered

Anders Logg proposed the following answer:
On Wed, Mar 23, 2011 at 10:26:57PM -0000, Neilen Marais wrote:
> New question #150226 on DOLFIN:
> https://answers.launchpad.net/dolfin/+question/150226
>
> Hi,
>
> Is there a way I can access mesh regions defined in a gmsh mesh? For instance, if I define a .geo file with labled physical volumes:
>
> ....
> Volume(25) = {24};
> Surface Loop(26) = {14, 10, 12, 17};
> Volume(27) = {26};
> Physical Volume ( 1000 ) = { 25 };
> Physical Volume ( 2000 ) = { 27 };
>
> with the resulting .msh file:
>
> $Elements
> 10
> 1 4 3 1000 25 0 1 9 6 10
> ....
> 5 4 3 1000 25 0 10 6 2 8
> 6 4 3 2000 27 0 6 9 3 7
> ....
> 10 4 3 2000 27 0 6 9 7 8
> $EndElements
>
> IOW, tets 1 through 5 have label 1000, and 6 through 10  has label 2000.
>
> After putting the .msh file through dolfin-convert the label data seems to be lost. Is this simply a limitation of dolfin-convert not supporting the gmsh feature, or does the dolfin mesh type not support labels of such a kind?
>
> Thanks
> Neilen

DOLFIN uses the MeshFunction class to store subdomain labels. If there
are no MeshFunctions defined in the <data> section of the resulting
XML file, then it's not supported by the dolfin-convert script.

If you find it's missing and know how to fix it consider submitting a
patch.

--
Anders

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