[Gmsh] Double inner surfaces (RE: cross section from Solidworks into gmsh)

[Zenker, Dr. Matthias]

There is a still a problem, however: In the case of adjacent bodies, the
procedure below does not work. The reason is that each body is
represented by a closed outer surface (which becomes a line in 2D), so
that there are two surfaces (lines) between the two bodies. It follows
that SolidWorks cannot produce 2D data. So I have to take the 3D STEP as
before and manually remove the 3rd dimension and the second lines
between all adjacent bodies. This is rather tedious and takes time.
(First remove the 3rd dimension: volumes, surfaces, lines, points. Then
identify the problematic regionswhere there is a double line between
adjacent surfaces. Delete one of the adjacent surfaces. Delete the
corresponding line at the interface. Delete its points. Redefine the
surface which was deleted before.)
 
Any hint how this can be done in a more elegant way would be most
welcome.
 
Matthias
 


________________________________

	From: gmsh-bounces at geuz.org [mailto:gmsh-bounces at geuz.org] On
Behalf Of Zenker, Dr. Matthias
	Sent: Friday, February 06, 2009 8:54 AM
	To: gmsh at geuz.org
	Subject: [Gmsh] cross section from Solidworks into gmsh
	
	
	Hi all,
	 
	I had some problems to generate 2D data from a cross section of
a 3D geometry in SolidWorks. Thanks to a note from Rich Bayless, I have
solved this problem: If you know how to do it, it is possible to export
the cross section as a 2D STEP (or IGS) file which gmsh can read. Since
I may not be the only one for whom this is useful, I want to share the
information with the list. You can find it below.
	 
	Matthias


________________________________

		From: Rich Bayless [mailto:richard.bayless at att.net] 
		Sent: Friday, January 30, 2009 7:10 PM
		To: Zenker, Dr. Matthias
		Subject: Re: cross section from Solidworks into gmsh
		
		

			Hello Matthias,
			 
			your question about extracting a cross section
from solidworks was interesting.  Seems that once you create a 2D
drawing from a solidworks section view, that DWGeditor only allows
saving the 2D entities as DXF, which is not currently supported in gmsh.
			 
			I experimented a bit and was able to do what you
want, from within solidworks.  Open the 2D drawing with your desired
section view using solidworks.  Solidworks will show it as a drawing,
not a part.  Open a second window with a new, blank, part.  Select all
desired entities, and copy/paste the entities to the new part.  The new
part will show a sketch with your entities.  Select the sketch and
Insert, Surface, Planar, and it will make a surface.  You can then save
the surface as either igs or step, and it will open in gmsh.
			 
			I suspect that the above tactics will be useful
for anyone using a commercial 3D cad program.
			 
			Hope this helps,  Rich.

	
	
	
 	  	  	

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



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

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