[vtkusers] vtkDecimate or vtkDecimatePro

[<bourouis.sami@voila.fr]

hi all,
I would like used a Vtk class like vtkDecimate or vtkDecimatePro to reduce some faces(triangles) and points in my polydata, only triangles witch I would like simplify,
how can I simplify these triangles with one of these class ?
thanks,
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