code: def load_structured():
      
      x = np.arange(-10, 10, 0.25)
      y = np.arange(-10, 10, 0.25)
      x, y = np.meshgrid(x, y)
      r = np.sqrt(x**2 + y**2)
      z = np.sin(r)
      return vtki.StructuredGrid(x, y, z)
docs: Loads a simple StructuredGrid