[Gmsh] Gmsh Python API

[Christophe Geuzaine]

> On 21 May 2018, at 18:54, Alejandro Pina <ajpina at gmail.com> wrote:
> 
> Thanks Christophe for replying. I have attached a picture after adding the line you suggested. 
> In the picture you can also see the API version I am using and built number. The size of triangles does not respond to any value set on ‘lc’.

By default gmsh.intialize() reads the Gmsh configuration files it finds on your system; my guess is that you have some options set in .gmshrc or .gmsh-options to change the default meshing algorithm (your log shows that you're using Frontal, which is not the default) and the mesh size.

Try

   gmsh.initialize('', False)

which will disable reading of the config files.



> Best,
> Alejandro 
> 
> From: Christophe Geuzaine <geuzaine at gmail.com <mailto:geuzaine at gmail.com>>
> Date: Monday, May 21, 2018 at 7:36 AM
> To: Alejandro Pina <ajpina at gmail.com <mailto:ajpina at gmail.com>>
> Cc: <gmsh at onelab.info <mailto:gmsh at onelab.info>>
> Subject: Re: [Gmsh] Gmsh Python API
> 
> 
> It works fine over here: are you sure you are editing/examining the correct input/output files?
> 
> Add
> 
>   gmsh.fltk.run()
> 
> before gmsh.finalize() - it will launch the GUI so that you  can inspect the model interactively.
> 
>> On 20 May 2018, at 21:03, Alejandro Pina <ajpina at gmail.com <mailto:ajpina at gmail.com>> wrote:
>> 
>> Dear List,
>> 
>> I have been trying to use the Python API but my meshing does not respond to the mesh size that I set when adding the points. I reproduced my problem in the following example. So no matter what value I set on ‘lc’, the surface always happens to have only four triangles.
>> 
>> Hope you can help me figure it out and be able to control the meshing. I am also attaching the resulting 'MyTest.msh’ file. 
>> 
>> import gmsh
>> 
>> gmsh.initialize()
>> gmsh.option.setNumber("General.Terminal", 1)
>> gmsh.model.add("MyTest")
>> lc = 1e-4
>> gmsh.model.geo.addPoint(0, 0, 0, lc, 1)
>> gmsh.model.geo.addPoint(.1, 0,  0, lc, 2)
>> gmsh.model.geo.addPoint(.1, .3, 0, lc, 3)
>> gmsh.model.geo.addPoint(0, .3, 0, lc, 4)
>> gmsh.model.geo.addLine(1, 2, 1)
>> gmsh.model.geo.addLine(3, 2, 2)
>> gmsh.model.geo.addLine(3, 4, 3)
>> gmsh.model.geo.addLine(4, 1, 4)
>> gmsh.model.geo.addCurveLoop([4, 1, -2, 3], 1)
>> gmsh.model.geo.addPlaneSurface([1], 1)
>> gmsh.model.addPhysicalGroup(2, [1], 1)
>> gmsh.model.setPhysicalName(2, 1, "My surface")
>> gmsh.model.geo.synchronize()
>> gmsh.model.mesh.generate(2)
>> gmsh.write("MyTest.msh")
>> gmsh.finalize()
>> 
>> Thanks,
>> Alejandro
>> 
>> 
>> <MyTest.msh>_______________________________________________
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> 
> <Screen Shot 2018-05-21 at 5.47.04 PM.png>

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