[Paraview] Probe cell index of unstructured grids

[waku]

Dear all,

I'd like  to know how to probe cell index number of  unstructured grids.
For example, after loading unstructured data (typically Hexa or Tetra),
I hope to know the cell index like below:
1) set x, y, and z
2) automatically probe the index number of the cell that includes the
above (x,y,z) point

Sincerely yours,
Waku
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waku2005 at gmail.com