[vtkusers] vtkImageInterpolator -> gradient

[Martin Genet]

Dear all:

On the wiki page on image interpolators 
<http://www.vtk.org/Wiki/VTK/Image_Interpolators#Gradients>, I read the 
following:

 > It would be possible to add methods to the interpolator classes so 
that they could return the gradient of the image at any (X,Y,Z) point.

I was wondering: has there been any progress on this side? It would 
quite useful. Any thought on the implementation? Thanks!

Martin

<http://www.vtk.org/Wiki/VTK/Image_Interpolators#Gradients>
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