[Gmsh] boolean partitioning

[Zenker, Dr. Matthias]

Thank you!

Does it work also with STEP data imported from CAD?

Matthias

> -----Ursprüngliche Nachricht-----
> Von: Christophe Geuzaine [mailto:cgeuzaine at ulg.ac.be]
> Gesendet: Mittwoch, 3. Mai 2017 10:34
> An: Zenker, Dr. Matthias
> Cc: andrew; gmsh at onelab.info
> Betreff: Re: [Gmsh] boolean partitioning
>
>
> Have a look at the new boolean examples, e.g.
>
> https://urldefense.proofpoint.com/v2/url?u=http-
> 3A__gitlab.onelab.info_gmsh_gmsh_blob_master_demos_boolean_comps
> olid.geo&d=DwIFaQ&c=7vND7vRFB1FzfxRXc-X80O-MJSZd5Q-IVyyYW-
> Ff2gY&r=3enlI3TuQDmO9BnMCnxq2Mfm4tAO6Z3_Ae1Yc57DMr4&m=2mpe
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> _YoQoMQy6J3MVGy7jh30SFFLo&e=
> https://urldefense.proofpoint.com/v2/url?u=http-
> 3A__gitlab.onelab.info_gmsh_gmsh_blob_master_demos_boolean_comps
> olid2.geo&d=DwIFaQ&c=7vND7vRFB1FzfxRXc-X80O-MJSZd5Q-IVyyYW-
> Ff2gY&r=3enlI3TuQDmO9BnMCnxq2Mfm4tAO6Z3_Ae1Yc57DMr4&m=2mpe
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> E2UBNMZprqYawTICL8jZpa7UfM&e=
>
> BooleanFragments does exactly what you need.
>
>
> > On 3 May 2017, at 10:14, Zenker, Dr. Matthias <Matthias.Zenker at erbe-
> med.com> wrote:
> >
> > Hi,
> >
> > I would also be interested in that functionality. It would resolve the old
> “duplicated surfaces” problem that forced me (and others) to leave gmsh
> and do the meshing with Salomé, even though IMHO gmsh does a better job
> especially in 3D meshing – in Salomé, only netgen is available as 3D algorithm
> in the free version.
> > BTW there seems to be a macro permitting to use gmsh in Salomé, see
> > this post at the Salomé forum:
> > https://urldefense.proofpoint.com/v2/url?u=http-3A__salome-
> 2Dplatform.
> > org_forum_forum-5F12_953948027-
> 23494327180&d=DwIFaQ&c=7vND7vRFB1FzfxRX
> > c-X80O-MJSZd5Q-IVyyYW-
> Ff2gY&r=3enlI3TuQDmO9BnMCnxq2Mfm4tAO6Z3_Ae1Yc57D
> >
> Mr4&m=2mpeDRom3Noibyq90RXwKUzWF1rJRcO6ZGHMbIFv5so&s=bweZW
> T8PCF107y-xPl
> > l629T-vfFUIANxsy48ZRnkG6Q&e=
> > I haven’t tested it, though.
> > To export a geometry from Salomé to gmsh, I have sometimes had success
> using brep format.
> >
> > Matthias
> >
> > Von: andrew [mailto:armitatz at gmail.com]
> > Gesendet: Dienstag, 2. Mai 2017 19:58
> > An: gmsh at onelab.info
> > Betreff: [Gmsh] boolean partitioning
> >
> >
> > hi,
> >
> > In Salome which uses the opencascade model there is a Boolean operation
> called partition. With this you can create a solid from two others but with a
> shared face. A usage of that is the creation of meshes with internal walls in it
> with zero thickness aka 'baffles'. Is there a procedure in gmsh that can give
> the same results given that it has implemented the same opencascade
> model? Obviously there is a way to have such results if you give the precise
> geometry but sometimes it is very difficult to cut geometries and it is easier if
> gmsh could do that.
> >
> > Attached is an image of a mesh with internal baffles created with
> partitioning and the geometry that created it. I would prefer t if gmsh could
> do the meshing but I haven't found a way to load the geometry to gmsh from
> Salome.
> >
> > kind regards
> >
> > Andrew
> >
> >
> > Erbe Elektromedizin GmbH Firmensitz: 72072 Tuebingen
> > Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede Registergericht:
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>
> --
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> https://urldefense.proofpoint.com/v2/url?u=http-
> 3A__www.montefiore.ulg.ac.be_-
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> IVyyYW-
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> THkiX9PY4exsvpqL5Sbt0HxU&e=

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