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[Op3rAtor <>]

i can control the insert process of my meshing points. I can keep track of
mesh changes using standard methods of the triangualtion class but this is
very expensive. Before i insert a point i need to estimate the faces which
will be changed and so on ...  
This is too expensive for fast mesh processing thus an Observer for the
triangulation data structure would be nice. Currently i added my own face
class and in the constructor and destructor i notify a singleton class which
is able to keep track of changes but i'm not very confident with this
solution. 



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