[Gmsh] Access to full line or surface information

[jeremy theler]

what's wrong with using Gmsh' physical entities for defining boundary
conditions?

btw, the answer to what you asked is: export the model to brep and you will
get all the information there. Look for the brep format description in the
opencascade documentation.

On Fri, Aug 17, 2018, 13:46 Pieter Reumers <pieter.reumers at kuleuven.be>
wrote:

> Dear all,
>
>
>
> I’m trying to get access to the full geometry of a certain model created
> using gmsh. For example, consider the following *.geo file:
>
>
>
> Point(1)={0, 0, 0};
>
> Point(2)={1, 0, 0};
>
> Point(3)={0, 1, 0};
>
> Circle(1)={2,1,3};
>
> Line(2)={2,3};
>
>
>
> This *.geo file creates a quarter circle and a straight line. When using
> the Mesh.SaveTopology option, all entities are saved in the $Entities …
> $EndEntities section:
>
>
>
> $Entities
>
> 3 2 0 0
>
> 1 0                          // Point 1
>
> 2 0                          // Point 2
>
> 3 0                          // Point 3
>
> 1 2 2 3 0               // Line 1 (=circle)
>
> 2 2 2 3 0               // Line 2
>
> $EndEntities
>
>
>
> As you can see, lines 1 and 2 seem to be identical entities, while in
> reality they are not. Line 1 is a quarter circle, while line 2 is a
> straight line. Is there a way to export the full geometry/topology
> information from gmsh at the moment? Thus, for a circle, this would be
> three points (the input points provided to the Circle command). My goal is
> to use gmsh as a mesh generator and couple it to an existing MATLAB finite
> element solver. Extracting the precise topology from gmsh allows for the
> easy definition of boundary conditions (e.g. distributed load on a circular
> line segment or pressure on a curved surface).
>
>
>
>
>
> Thanks in advance.
>
>
>
> Kind regards,
>
> Pieter Reumers
> _______________________________________________
> gmsh mailing list
> gmsh at onelab.info
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>
-- 
--
jeremy theler
www.seamplex.com
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