code: def close(self):
          
          # must close out axes marker
          if hasattr(self, 'axes_widget'):
              del self.axes_widget
  
          # reset scalar bar stuff
          self._scalar_bar_slots = set(range(MAX_N_COLOR_BARS))
          self._scalar_bar_slot_lookup = {}
          self._scalar_bar_ranges = {}
          self._scalar_bar_mappers = {}
  
          if hasattr(self, 'ren_win'):
              self.ren_win.Finalize()
              del self.ren_win
  
          if hasattr(self, '_style'):
              del self._style
  
          if hasattr(self, 'iren'):
              self.iren.RemoveAllObservers()
              del self.iren
  
          if hasattr(self, 'textActor'):
              del self.textActor
  
          # end movie
          if hasattr(self, 'mwriter'):
              try:
                  self.mwriter.close()
              except BaseException:
                  pass
docs: closes render window