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

[Christophe Geuzaine]

> On 12 Oct 2017, at 22:10, Jeremy Theler <jeremy at seamplex.com> wrote:
> 
> 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.

Indeed: done.


> 
> 
> 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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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

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