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Change Gradient filter default for vtkImageData

Tiffany Chhim requested to merge tiffany.chhim/paraview:changeGradientFilterDefault into master

For vtkImageData objects, the default implementation for the computation of the gradient is changed to that of vtkGradientFilter (the old Gradient Of Unstructured DataSet filter), which offers more options and is more accurate.

Additionally, the Boundary Method property option names are changed to be more adequate as follows:

  • Central differencing -> Smoothed
  • Forward/backward differencing -> Non-Smoothed

Fix #20957 (closed).

Edited by Tiffany Chhim

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