dolfin team mailing list archive

[Bartosz Sawicki <sawickib@xxxxxxxxxxxxx>]

On 19/06/09 02:53 PM, kent-and@xxxxxxxxx wrote:
> When using VMTK the boundary indicators are stored as a set of arrays
> with names
> boundary facet cells,
> boundary facet numbers
> boundary indicators
> The two first arrays are used to find the global facet numbers.
> The function computes a mesh function based on these arrays.
>
> This was what Anders prefered since VMTK does not now anything
> about the global numbering of facets in Dolfin (without linking it into
> Dolfin).
>
> This is not a VMTK specific problem, but I do think VMTK is the only
> mesh-generator
> that let you store boundary indicators at the moment. I guess we should add
> this to NetGen as well, both Hans Petter Langtangen and Douglas Arnold has
> bugged
> me about this the last few days.

I'm every day user of this functionality. I use Netgen generated models, 
but also other software which add boundary indicators to existing 
meshes. Netgen supports boundary indicators quite well, both by geo 
files, and by GUI. I don't understand what you want to add?

Before Fenics I was using Diffpack, where boundary indicators are based 
 on vertices. Which was maybe easier to store, but Dolfin facet 
indicators are more natural. I have a script to convert diffpack models 
to dolfin xml (with boundary and material indicators). It can be used to 
convert Netgen meshes, via export to diffpack format.

cheers,
BArtek



> Kent
>
> > What's the function
> >
> >      Assembler::compute_mesh_function_from_mesh_arrays
> >
> > all about?
> >
> > Garth
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>
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