[Gmsh] Is there any "special magic" to Extrude?

[Christophe Geuzaine]

On 02 Dec 2012, at 17:10, wibr <lists at wibr.de> wrote:

> Hi,
> 
> I am currently in the process of rewriting a tool to create geometries in form of .geo files. The previous tool was not written by me.
> 
> For creating the geometry for 2D meshes it will just create a list of points, lines and a surface which will then be extruded. So far no problem.
> However for 3D meshes after this exact same process all the connecting lines/surfaces between the original surface and the extruded one are deleted and then recreated (otherwise the meshing won't produce the desired result).
> This seems rather inelegant to me. I would very much prefer to create the extruded part on my own, since deleting the items requires the numbers of those, which are determined from example geometries and must be hard coded, therefore the whole thing becomes really error-prone.
> 
> So, is there anything what the Extrude command does which can't be done manually using the basic elements and commands like Point/Line/Surface and Translate/Rotate?
> 

The only thing is that transformation in Extrude can be used to create structured meshes (cf. Layers).

Christophe

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