code: def plot_entities(self, show=False):
          
          import matplotlib.pyplot as plt
          from mpl_toolkits.mplot3d import Axes3D  # NOQA
          fig = plt.figure()
          axis = fig.add_subplot(111, projection='3d')
          for entity in self.entities:
              vertices = entity.discrete(self.vertices)
              axis.plot(*vertices.T)
          if show:
              plt.show()
docs: Plot discrete version of entities without regards
          for connectivity.
  
          Parameters
          -------------
          show : bool
             If False will not execute matplotlib.pyplot.show