[Gmsh] export .step file without duplicated geometry

Christophe Geuzaine cgeuzaine at uliege.be
Tue Apr 28 14:18:33 CEST 2020

Hi Kelal,

Indeed it's a known issue with the STEP exporter. Let's continue the discussion here:


We currently create a single compound for the model, and use the "STEPControl_AsIs" OpenCASCADE option to export STEP files. It's maybe not what we should do...


> On 28 Apr 2020, at 12:30, Kelal Raschket <mrkelalraschket at mail.com> wrote:
> Hello gmsh community,
> I found the following discussion in the gmsh mailing archive: http://onelab.info/pipermail/gmsh/2018/012233.html.
> There they discussed how to export a geometry in gmsh using the OpenCASCADE kernel. I used the .geo file attatched there and exported it as .step file as well. When I then loaded the resulting .step file into gmsh again to see if everything worked like expected I recognized that points, curves and surfaces are loaded multiple times. What can I do to only save all my geometry once?
> And a second, related question: Is there a similar function in gmsh for deciding to either save all the created geometry or only the ones also in a physical group? Something identical like the "Mesh.SaveAll" function just for geometry.
> Thank you,
> Kelal Raschket
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Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 

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