[Gmsh] Eliminating geometric duplications in imported geometry

[Bram Sterling]

I'll definitely consider that approach as a possibility for later work.

Thanks,
Bram

From: Bernd Hahnebach <gmsh at b75.ch>
>
>
> see https://www.freecadweb.org/wiki/Part_BooleanFragments
>
> the CompSolids greated with the tool above work great together with
> GMSH to make connected multi body meshes !
>
> It is even possible to invoke GMSH from within FreeCAD and make
> differet mesh size or mesh groups for the different bodies, by GUI or
> by python :-)
>
> bernd
>
>
> Zitat von Jeremy Theler <jeremy at seamplex.com>:
>
> > Just to complete, you can also get a compsolid through a boolean
> > fragment at FreeCAD. There has been a long discussion on FreeCAD's side.
> > See for example first this:
> >
> > https://forum.freecadweb.org/viewtopic.php?t=13830
> >
> > And lately this:
> >
> > https://forum.freecadweb.org/viewtopic.php?t=13830
> >
> > --
> > Jeremy Theler
> > www.seamplex.com
> >
> >
> >
> > On Sat, 2017-03-18 at 09:46 +0100, Christophe Geuzaine 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
> >> > _______________________________________________
> >> > gmsh mailing list
> >> > gmsh at onelab.info
> >> > http://onelab.info/mailman/listinfo/gmsh
> >>
> >
> >
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