[Gmsh] 3D volume as tetrahedra only

Mark Starnes mark.starnes at fttech.co.uk
Tue May 1 10:42:09 CEST 2012

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

Search for, `Physical' in the manual:


Best regards,


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
> _______________________________________________
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> gmsh at geuz.org
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Dr. Mark Starnes
Principal Physicist
FT Technologies
Church Lane
TW11 8PA

web:  www.fttech.co.uk
DDI:  0208 614 2730

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