code: def points(self):
          
          x = vtk_to_numpy(self.GetXCoordinates())
          y = vtk_to_numpy(self.GetYCoordinates())
          z = vtk_to_numpy(self.GetZCoordinates())
          xx, yy, zz = np.meshgrid(x,y,z, indexing='ij')
          return np.c_[xx.ravel(), yy.ravel(), zz.ravel()]
docs: returns a pointer to the points as a numpy object