code: def show(self, viewer=None, **kwargs):
          
  
          if viewer is None:
              # check to see if we are in a notebook or not
              from ..viewer import in_notebook
              viewer = ['gl', 'notebook'][int(in_notebook())]
  
          if viewer == 'gl':
              # this imports pyglet, and will raise an ImportError
              # if pyglet is not available
              from ..viewer import SceneViewer
              return SceneViewer(self, **kwargs)
          elif viewer == 'notebook':
              from ..viewer import scene_to_notebook
              return scene_to_notebook(self, **kwargs)
          else:
              raise ValueError('viewer must be "gl", "notebook", or None')
docs: Display the current scene.
  
          Parameters
          -----------
          viewer: str 'gl':       open a pyglet window
                  str,'notebook': return ipython.display.HTML
                  None: automatically pick based on whether or not
                            we are in an ipython notebook
          smooth : bool
            Turn on or off automatic smooth shading