    connectivityFilter = vtkConnectivityFilter()
    connectivityFilter.SetInputConnection(appendFilter.GetOutputPort())
    connectivityFilter.SetExtractionModeToAllRegions()
    connectivityFilter.ColorRegionsOn()
    connectivityFilter.Update()

--
    connect = vtkConnectivityFilter()
    connect.SetInputConnection(deci.GetOutputPort())
    connect.SetExtractionModeToLargestRegion()
    connect.Update()
    print('After Connectivity.')
    print('There are: ', NumberOfTriangles(connect.GetOutput()), 'triangles')
