[Gmsh] Eliminating geometric duplications in imported geometry

[Bram Sterling]

It looks like this did exactly what I needed, thank you.

Bram

On Sat, Mar 18, 2017 at 4:46 AM, Christophe Geuzaine <cgeuzaine at ulg.ac.be>
wrote:

>
> > On 17 Mar 2017, at 23:24, Bram Sterling <bram.sterling at ossiumhealth.com>
> wrote:
> >
> > I'm trying to mesh a 3D 2-material construct created in another program
> (FreeCAD) and brought into Gmsh by way of a BREP file.  After some
> troubleshooting downstream, I determined that Gmsh is turning the two
> volumes into two disjoint meshes despite their extensive shared surface.
> >
> > Poking around, I suspect the reason for this is that the two volumes
> share no elementary geometry.  Instead, the shared lines and surfaces are
> duplicated.
> >
> > If the original geometry had been defined in a Geo script this would
> seem straightforward to fix manually, but it seems a bit more complicated
> here, especially as this is bound to come up again with more complex
> geometry later.  Is deleting the redundant geometry and rebuilding other
> effected parts manually the best option, or is there a better way?
> >
>
> With a recent nightly build, create a .geo script that does the following
> (assuming the brep contains 2 volumes):
>
> SetFactory("OpenCASCADE");
> a() = ShapeFromFile("file.brep");
> BooleanFragments{ Volume{a(0)}; Delete; }{ Volume{a(1)}; Delete; }
>
> Note that you can now directly create your CAD inside Gmsh: see
> demos/boolean/*.geo for examples.
>
> Christophe
>
>
> >
> > Thank you,
> > Bram Sterling
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>
> --
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://www.montefiore.ulg.ac.be/~geuzaine
>
> Free software: http://gmsh.info | http://getdp.info | http://onelab.info
>
>
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