[Gmsh] Gmsh - additional programming for constraints and materials

[Christophe Geuzaine]

mglocken at aol.com wrote:
> Hi,
> 
> I have done a bit of work with Gmsh and would like to continue using 
> this tool. A serious problem for me is the lack of functionality for 
> defining constraints and materials. So I´m thinking about adding this 

Hi Michael - It's actually something we are working on. But the GUI for 
this needs to be overhauled...

At the moment just define physical points/lines/surfaces/volumes. This 
allows you to tag elements in the mesh. You can then define your 
constraints based on these tags.


> functionality myself. If my work is successful, it may be useful for 
> other Gmsh users, too. But I´m not sure that it´s welcome, i.e. that it 
> fits the intention of Gmsh development. Does it?
> 
> But anyway I have some questions concerning the concept.
> 
> First I would like to learn how to build a new menu item, maybe 
> "Constraints". I have seen a lot of menu stuff in Fltk/GUI.cpp. Maybe 
> adding the menu item in 286:Context_Item menu_mesh[] is a good beginning?
> 
> Next I need to know the functions for identifying and activating nodes 
> in the GUI. Where are these functions in the code?
> 
> My first idea is to store the nodes, which have constraints, in an 
> array. But I´m not experienced enough to say, that its a good approach, 
> especially for big meshes. What do you think?
> 
> I think, there should be some code to identify those nodes, which are 
> connected to selected geometry entities (points, curves, surfaces, 
> volumes). If you know, which functions are dedicated to this, please let 
> me know.
> 
> Last but not least are the functions for writing to the output files of 
> interest.
> 
> 
> 
> Greetings,
> 
>    Michael Glockenmeier
> 
> ----------------------------------------------
> Fa. Michael Glockenmeier
> Dipl.-Ing. Michael Glockenmeier
> Hauptstr. 55 c
> D-86926 Greifenberg
> Germany
> 
> Tel ++49 (0) 8192/933 185
> Fax ++49 (0) 8192/933 186
> Email mglocken at aol.com
> 
> Visit my site: www.femcfd.com
> ------------------------------------------------------------------------
> *AOL eMail auf Ihrem Handy!*Ab sofort können Sie auch unterwegs Ihre AOL 
> email abrufen. Registrieren <http://www.aol.de/Webmail/> Sie sich jetzt 
> kostenlos.
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> gmsh mailing list
> 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