[Gmsh] How to mesh only the volume(s) and not the lines, surfaces etc?

[Jeremy Theler]

Fourth paragraph:
In the MSH file format (see File formats), if physical entities are
defined, the output mesh only contains those elements that belong to
physical entities. 
BTW, I have given this link several times answering the same question. Maybe this should be added to the FAQ as one of the most frequent.

On Thu, 2017-10-12 at 14:38 +0200, Shamsul Arefin wrote:
> Sorry Jeremy, did not get that. How does this link relate to the subject?
> Regards,
> Shamsul Arefin
> ph: 017655441319
>                                         
>                                         
> >                         On Thu 12 Oct 3:26:09 am, jeremy theler <jeremy at seamplex.com> wrote:http://gmsh.info/doc/texinfo/gmsh.html#Elementary-vs-physical-entities
> > 
> > On Wed, Oct 11, 2017, 17:36 Fernando Lorenzo <felorenzo at att.net> wrote:
> > > If you save your mesh as Tochnog format, you will only get the tetrahedron or hexahedron if that is what you choose. 
> > > Your file will be name.dat. It will have a lot of details on how to set up the input file for tochnog, but you will find all the nodes and connectivities.
> > > 
> > > 
> > > Fernando Lorenzo
> > > Sent from my iPhone
> > > On Oct 11, 2017, at 9:54 AM, Shamsul Arefin <mail.shanto at gmail.com> wrote:
> > > 
> > > > How to mesh only the volume(s) and not the lines, surfaces etc?
> > > > In my project I have imported a step-file of a bearing race (imagine a hollow cylinder). I want meshes on the volume only. The other geometric entities should be ignored. How do I make that happen?
> > > > 
> > > > Normally if I use the '3D' mesh from the command tree, i find elements on the line, surface and volumes. Whereas, I don't want any 2D elements rather only 3D tetrahedron was expected. 
> > > > 
> > > > 1# I have tried to delete the geometry items, the edges, and failed. >>> idea was to keep only the volume entity in the CAD and mesh only the volume.
> > > > 
> > > > 2# i tried to define physical entities of the volumes, to mesh only that physical entity, and failed. 
> > > >  a. I could not perform a selection (in coding) only for the volume elements.. 
> > > >  b. even if I could succeed to select the volumes, I don't find a Meshing command to mesh only a particular physical entity. 
> > > > 
> > > > 
> > > > Regards,
> > > > Shamsul Arefin
> > > > 
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> > -- 
> > --
> > jeremy theler
> > www.seamplex.com
> > 
> > 
> >                         
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