[vtkusers] vtkDataSet::findcell with different tolerances in x y z ?

[Sebastien_MARAUX]

Is there a method of type FindCell, but with different 
tolerance in x, y and z ?

This could help locate a cell of a MNT containing (x,y) by setting tolerance to (x,y=0, z=dblmax). 

And finally to find z altitude at x,y by using interpolation 
methods of the cell.

Note : Final goal is to find z for a given (x,y) couple of values in a group of cells making a (x,y) irregular surface.

Sebastien MARAUX
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