[vtkusers] How to pick a CellId in both global grids and local grids

[Li Qichong]

Hi, VTK Guru
    Sorry to bother everyone, I have a question about how to pick a Cell ID 
in in both global grids and local grids? For example, we have global grids: 
5*5*5, then the first cell in the global grid divided into 2*2*2 local 
grids, Now I need pick the cell ID for each block. I tried use CellPicker, 
but it only picked the global grid, skipping the local grid. Thanks!
Li

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