[vtkusers] Strange rendering artifacts

[Keith]

Interestly if i remove the vtkCleanPolyData (which i'm setting up with the
code below) i don't see the issue with the dots anymore, but the shading now
looks flat shaded so i lost the smooth shading effect.

    vtkSmartPointer<vtkCleanPolyData> cleanPolyData =
        vtkSmartPointer<vtkCleanPolyData>::New();
    cleanPolyData->SetInputData ( polyData );
    cleanPolyData->Update();





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