[Gmsh] Problem about 'Plugin Crack'

Xiaoxin Lu xiaoxin.lu at u-pem.fr
Tue Oct 25 16:12:35 CEST 2016

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? 
Thank you very much. 

Best ragards, 

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