[Gmsh] How to separate faces in an *.STL file

[Velan]

Hi alex,

Same problem i faced. Now i solved it using engrid.

Export the volume mesh to *.msh format in gmsh. Then import to engrid and
create the physical boundary conditions using "set boundary codes" and
export it back to gmsh format.

Hope it helps !

On Tue, Jul 21, 2009 at 8:13 PM, Mark van Doesburg <
mark.van.doesburg at technolution.nl> wrote:

> Hello Alex,
>
> I am using BRL-CAD to generate input for gmsh as well. What I initially
> did was to use g-iges to generate a faceted brep model, for example:
>
>        g-iges -o region.iges -f brl.g region.r
>
>
> For each region I generated a seperate IGES file. If you merge the iges
> files using the Merge command in the .geo file you can add physical
> regions and surfaces.
>
> When using the IGES format, each triangle will be a seperate geometrical
> surface.
>
> regards,
>
> Mark van Doesburg
>
>
> Alexandre Pereira <iskandhar2000 at gmail.com> wrote:
>
>        Hi Forum
>
>        I want to use GMSH to mesh *.stl files that have been built
>        elsewhere ( In BRL CAD to be more exact ) which will be used as
>        models for FEA analysis in Code Aster.
>
>        I want to export them in *.med format containing the
>        mesh info as well as some topological info about physical
>        lines/surfaces/volumes.
>
>        In GMSH, I can import the *.stl, define a volume using the *.stl
>        boundary, mesh/refine the boundary, and mesh/refine the created
>        volume, what i cannot ( do not know how to ...) do is to separate
>        the boundary of my *stl in primitive faces to give the a physical
>        meaning ( they will be used on Boundary condition addressing in
>        ASTER ), can this be done in GMSH, or sould I build my geometry
>        in GMSH prior to do all this...?
>
>
>        My maisn issue is that BRL CAD contains some 3D primitives that do
>        not exist in GMSH, like elliptical/hyperbolic cones generalyzed
>        ellipsoids, etc, and I use the generated surfaces in my *.stl
>        as boundaries in some of my models....
>
>
>        Can someone please help...?
>
>
>        Best regards
>
>
>        Alex
>
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