[vtkusers] Need to pick a cell and it's neighbors

[tasnim]

tasnim wrote
> 
> You can set a member variable of the InteractorStyle subclass in which 
> you are implementing OnLeftButtonDown and use that as the input. 
> 
more explanation please. I tried to apply the triangleFilter on the picked
cell ( before that, i created a polyData from it ) in the OnLeftButtonDown()
, but nothing is done, i got an unhadled exception :( .

Thanks again,
  Tasnim



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