[vtkusers] How to Connect vtkUnstructuredGridReader with vtkUnstructuredGrid

[Guido Aselmann]

Hi,

I want to get the GetNumberOfPoints of a file read with
vtkUnstructuredGridReader 

I think vtkUnstructuredGrid.GetNumberOfPoints would do the job

I try 

import vtk
reader = vtk.vtkUnstructuredGridReader()
reader.SetFileName("tracking.vtk")

ugrid = vtk.vtkUnstructuredGrid()
print ugrid.GetNumberOfPoints(reader)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
TypeError: function takes exactly 0 arguments (1 given)



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