[Gmsh] 3D volume as tetrahedra only

[jeremy theler]

Defining physical groups or not control what is saved in the .msh file not
what is shown in the GUI.

--
jeremy theler
www.seamplex.com

On Mon, Jun 8, 2020, 04:40 Keith Sloan <keith at sloan-home.co.uk> wrote:

> I am new to Gmsh and trying to reproduce the following but still seeing
> triangles on the surface.
>
> Can I check that when it mentions sphere demo it is talking about
> sphere-discrete.geo
>
> // merge a surface mesh (any format will work: .msh, .unv, etc.)
>
> Merge "sphere-surf.stl";
>
> // add a geometrical volume
>
> Surface Loop(1) = {1};
> Volume(1) = {1};
> Physical Volume('tets') = {2};
>
> // use this to force a coarse mesh inside
> //Mesh.CharacteristicLengthExtendFromBoundary = 0;
> //Mesh.CharacteristicLengthMax = 0.5;
>
> I have also tried
> Physical Volume('tets') = {1};
>
> Previous discussion
>
> Mark Starnes mark.starnes at fttech.co.uk
> Tue May 1 10:42:09 CEST 2012
> Previous message: [Gmsh] 3D volume as tetrahedra only
> Next message: [Gmsh] 3D electrostatic BEM solver
> Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
>
> Hi Bartek,
>
> Yes:  use a Physical Group definition in your .geo
> file, like this:
>
> Physical Volume('tets') = {2};
>
> where `2' in this case would be the volume number
> assigned to your tetrahedra and 'tets' is a name I
> made up.
>
> Adding a `Physical Group' definition results in
> only the groups specified as being physical being
> exported.
>
> Search for, `Physical' in the manual:
>
> http://www.geuz.org/gmsh/doc/texinfo/gmsh.html
>
> Best regards,
>
> Mark.
>
>
> On Tue, May 01, 2012 at 09:15:31AM +0200, Bartek Grychtol wrote:
> > Hi,
> >
> > I'm new to gmsh, just seeing if it can do what I need.
> > I have a surface mesh in an stl file. I need to create a nice
> > tetrahedral volume mesh,
> > but without changing anything on the surface.
> > The sphere demo does exactly that.
> > However, the generated .msh file contains both triangles (for the
> > surface) and
> > tetrahedra (for the volume inside).
> > Is there a way (a command or file format) to have the complete mesh
> > represented as tetrahedra only?
> >
> > Best wishes,
> >
> > Bartek
> >
> > _______________________________________________
> > gmsh mailing list
> > gmsh at geuz.org
> > http://www.geuz.org/mailman/listinfo/gmsh
>
> --
> Dr. Mark Starnes
> Principal Physicist
> FT Technologies
> Church Lane
> Teddington
> TW11 8PA
>
> web:  www.fttech.co.uk
> DDI:  0208 614 2730
>
>
> _______________________________________________
> gmsh mailing list
> gmsh at onelab.info
> http://onelab.info/mailman/listinfo/gmsh
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://onelab.info/pipermail/gmsh/attachments/20200608/3364ad4f/attachment.html>