[Gmsh] GMSH renumbers elemntaty tags on reload

Christophe Geuzaine cgeuzaine at ulg.ac.be
Thu Jan 29 12:19:15 CET 2015


> On 29 Jan 2015, at 10:45, Mark Smith <piedycat at yahoo.com> wrote:
> 
> Hi Christophe,
> Unfortunately it makes no difference ;-(
> I used cadexchanger from http://www.cadexchanger.com/ to convert the step file into a .brep file but this suffers with the same problem.
> If is do file: save as and type say file2.geo and with the GEO options box "save physical group lables"  ONLY ticked I get a file with all the points, lines line loops etc. When I lad this the element tag numbers stay fixed, ( it is relatively simple geometry consisting of volumes bounded by plane surfaces) but I cannot get the surfaces to be filled (rendered) but only crossed faces even when I set

Mark - Do not save your .brep/.step as a .geo! Gmsh is designed to work directly with the native files - "translating" them to .geo is only there for very specific uses or debugging purposes: the .geo CAD kernel is far too rudimentary to handle all the complexities of .step/.brep


> Geometry.SurfaceType = 2   this makes it difficult to pick surfaces to put into surface physical groups infact changing Geometry.SurfaceType to 0 1 or 2 make no difference to the way the surfaces are displayed?
> Strangely if I load in my cad geometry file Merge "file.STEP"; etc then the surfaces displayed are as expected if one changes the setting of Geometry.SurfaceType, any ideas?
> 
> Thanks in advance.
> Best regards
> Mark
> 
>  
> From: Christophe Geuzaine <cgeuzaine at ulg.ac.be>
> To: Mark Smith <piedycat at yahoo.com> 
> Cc: "gmsh at geuz.org" <gmsh at geuz.org> 
> Sent: Wednesday, January 28, 2015 7:11 PM
> Subject: Re: [Gmsh] GMSH renumbers elemntaty tags on reload
> 
> 
> > On 28 Jan 2015, at 15:36, Mark Smith <piedycat at yahoo.com> wrote:
> > 
> >  
> > Gmsh version 2.8.5
> > 
> > Hi, I load a step file generated in solidworks saved in AP203 or AP214 format and load in into GMSH using a .geo file with the following lines
> > 
> > // in gmsh options-geometry make sure the "cut and merge faces" is checked 
> > // to remove duplicate entities on import of STEP file
> > Merge "file.STEP";
> > Geometry.AutoCoherence = 1;
> > Coherence;
> > 
> > in the options:geometry I get the model to display the surface labels with their elementary tags number, if I hit reload the tag numbers change this make defining physical surfaces impossible since the surfaces shown in the surface physical groups keep changing;-(
> > I have not had this behaviour before and at this moment it is a show stopper, is there a way of preventing this behaviour?
> > 
> 
> I don't see this behavior when I do the same thing over here (note that "Geometry.AutoCoherence = 1; Coherence;" will have no effect on your STEP data)... Does adding "Delete All;" before the "Merge" command help?
> 
> 
> 
> 
> 
> > Thanks in advance
> > Mark
> 
> > 
> > 
> > _______________________________________________
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> > gmsh at geuz.org
> > http://www.geuz.org/mailman/listinfo/gmsh
> 
> -- 
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science 
> http://www.montefiore.ulg.ac.be/~geuzaine
> 
> 
> 
> 
> 

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







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