code: def _from_arrays(self, x, y, z):
          
          if not(x.shape == y.shape == z.shape):
              raise Exception('Input point array shapes must match exactly')
  
          # make the output points the same precision as the input arrays
          points = np.empty((x.size, 3), x.dtype)
          points[:, 0] = x.ravel('F')
          points[:, 1] = y.ravel('F')
          points[:, 2] = z.ravel('F')
  
          # ensure that the inputs are 3D
          dim = list(x.shape)
          while len(dim) < 3:
              dim.append(1)
  
          # Create structured grid
          self.SetDimensions(dim)
          self.SetPoints(vtki.vtk_points(points))
docs: Create VTK structured grid directly from numpy arrays.
  
          Parameters
          ----------
          x : np.ndarray
              Position of the points in x direction.
  
          y : np.ndarray
              Position of the points in y direction.
  
          z : np.ndarray
              Position of the points in z direction.