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 <ke...@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@onelab.info > http://onelab.info/mailman/listinfo/gmsh >
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