[Gmsh] dxf or other 2D import?

Thu Jan 29 10:11:51 CET 2009

Thank you for this clarification.

The problem with STEP data is that it is always 3D, so in order to generate a 2D geometry, I have to convert to geo format and remove the 3rd dimension (volumes, surfaces, lines, points) manually. Or is there a more elegant way to do that?

I have observed that when STEP data is saved in geo format, circular arcs are converted to splines with many points, which makes handling (and maybe also meshing) more complicated.
Can this behaviour be influenced?

Thank you,

Matthias 

> -----Original Message-----
> From: Christophe Geuzaine [mailto:cgeuzaine at ulg.ac.be] 
> Sent: Wednesday, January 28, 2009 2:56 PM
> To: Zenker, Dr. Matthias
> Cc: gmsh at geuz.org
> Subject: Re: [Gmsh] dxf or other 2D import?
> 
> Zenker, Dr. Matthias wrote:
> > Thank you for the info.
> > Since I have no C/C++ compiler on my system (Windoze XP 
> SP2): Is there a binary available?
> > Are there plans to incorporate the converter into gmsh?
> 
> No, this converter is very limited (it only translates points 
> and curves). It can be useful to get the main features of an 
> autocad file, but you'll have to fix the sketch by hand.
> 
> At the moment I think your best bet is still to export/import STEP.
> 
> 
> > The link in the description is unfortunately dead.
> > 
> > Matthias
> > 
> >> -----Original Message-----
> >> From: David Colignon [mailto:David.Colignon at ulg.ac.be]
> >> Sent: Wednesday, January 28, 2009 1:24 PM
> >> To: Zenker, Dr. Matthias
> >> Cc: gmsh at geuz.org
> >> Subject: Re: [Gmsh] dxf or other 2D import?
> >>
> >> Hi Matthias,
> >>
> >> we have a very basic dxf to geo converter in 
> >> utils/converters/autocad/dxf2geo.cpp :
> >>
> >> ...
> >> ...
> >> // This is a simple AutoCAD DXF to Gmsh GEO Data File 
> Converter // // 
> >> It was created from the AutoCAD DXF file to DKB data file 
> converter 
> >> // written and placed in the public domain 8/13/90 by Aaron // A. 
> >> Collins (http://www.sdsc.edu/~mjb/mae152/dxf.spec.txt).
> >> //
> >> // It parses a limited, but useful, subset of the AutoCAD 
> DXF file // 
> >> format. No effort has been made to handle the complete range of // 
> >> possible DXF opcodes and commands.
> >> ...
> >> ...
> >>
> >> Cheers,
> >>
> >> Dave
> >>
> >>
> >> --
> >> David Colignon, Ph.D.
> >> Collaborateur Logistique du F.R.S.-FNRS CÉCI - Consortium des 
> >> Équipements de Calcul Intensif ACE - Applied & Computational 
> >> Electromagnetics Sart-Tilman B28 Université de Liège 4000 Liège - 
> >> BELGIQUE
> >> Tél: +32 (0)4 366 37 32
> >> Fax: +32 (0)4 366 29 10
> >> WWW:    http://hpc.montefiore.ulg.ac.be/
> >> Agenda: 
> >> http://www.google.com/calendar/embed?src=david.colignon%40gmail.com
> >>
> >>
> >>
> >> Zenker, Dr. Matthias wrote:
> >>> Hi,
> >>>
> >>> I need to import 2D data generated as cuts from a 3D model in 
> >>> SolidWorks. One possibility would be to define a cut in
> >> SolidWorks and
> >>> export it as dxf (AutoCAD format). But it seems like gmsh
> >> is not able to
> >>> read dxf. Is there something I am missing (I just tried
> >> File->Open in
> >>> gmsh, it gave me a an error message)? Or what would be the best
> >>> (quickest) way to get the cut into gmsh? Is there any 2D
> >> vector format
> >>> it can read?
> >>>
> >>> The way I have done it before is to take a slice instead 
> of a cut, 
> >>> export it to STEP format, import it into gmsh and delete
> >> manually all
> >>> volumes, surfaces, lines and points in the 3rd dimension,
> >> which can be
> >>> very tedious for complex geometries.
> >>>
> >>> Any suggestions would be welcome.
> >>>
> >>> BTW, is there a complete list of all formats gmsh can read
> >> and write? I
> >>> have not found it in the manual, but I may have overlooked it...
> >>>
> >>> Thanks,
> >>>
> >>> Matthias
> >>>
> >>> ----------------------------------------------------------------
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> > 
> _____________________________________________________________________
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> 
> 
> --
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer 
> Science http://www.montefiore.ulg.ac.be/~geuzaine
> 

_____________________________________________________________________
ERBE Elektromedizin GmbH
Firmensitz: 72072 Tuebingen
Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede
Registergericht: Stuttgart HRB 380137