    poly_vertex = vtkPolyVertex()
    poly_vertex.GetPointIds().SetNumberOfIds(number_of_vertices)

    for i in range(0, number_of_vertices):
        poly_vertex.GetPointIds().SetId(i, i)

--
    polyVertex = vtkPolyVertex()
    polyVertex.GetPointIds().SetNumberOfIds(numberOfVertices)

    for i in range(0, numberOfVertices):
        polyVertex.GetPointIds().SetId(i, i)

--
    polyVertex = vtkPolyVertex()
    polyVertex.GetPointIds().SetNumberOfIds(numberOfVertices)

    for i in range(0, numberOfVertices):
        polyVertex.GetPointIds().SetId(i, i)

