text: from enthought.tvtk.api import tvtk
  
  cone = tvtk.ConeSource( height=3.0, radius=1.0, resolution=10 )
  cone_mapper = tvtk.PolyDataMapper( input = cone.output )
  cone_actor = tvtk.Actor( mapper=cone_mapper )
  cone_actor.property.representation = "w"
  
  ren1 = tvtk.Renderer()
  ren1.add_actor( cone_actor )
  ren1.background = 0.1, 0.2, 0.4
  ren_win = tvtk.RenderWindow()
  ren_win.add_renderer( ren1 )
  ren_win.size = 300, 300
  
  iren = tvtk.RenderWindowInteractor( render_window = ren_win )
  iren.initialize()
  iren.start()
  