[Gmsh] Problem about 'Plugin Crack'

[Christophe Geuzaine]

> On 25 Oct 2016, at 16:12, Xiaoxin Lu <xiaoxin.lu at u-pem.fr> wrote:
> 
> Dear GMSH users and developers,
> 
> I have a question about 'Plugin crack' command. 
> In the manual, it is said that 'The elements touching the crack on the “negative” side are modified to use the newly generated vertices'.
> I was wondering how to define the 'negative' side for 2D crack. Is it defined by NormalX, Normal Y and Normal Z, which are the components of normal vector of the crack surface? 

No,  Normal{X,Y,Z} is only used to explicitly provide for "1D cracks" (curves) the normal to the surface in which these cracks live. For 2D cracks the normal is computed as usual, based on the orientation of the triangles/quadrangles.

> Thank you very much.
> 
> Best ragards,
> Xiaoxin
> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

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