[vtkusers] Finding Max and Min of Curvature Values?

[B.J.Prosser at cs.cardiff.ac.uk]

Firstly im new to vtk so excuse me if this seems a simple question. I am trying
to get the max and min values (ie the highest and lowest gaussian curvature
values for the whole mesh, not for each point) as worked out using
vtkCurvatures but i dont know how to get to the actual raw data. Something do
with GetOutput ?

Thanks

Bryan