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, 
Xiaoxin 

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