code: def bounds(self):
          
          the_bounds = [np.inf, -np.inf, np.inf, -np.inf, np.inf, -np.inf]
  
          def _update_bounds(bounds):
              def update_axis(ax):
                  if bounds[ax*2] < the_bounds[ax*2]:
                      the_bounds[ax*2] = bounds[ax*2]
                  if bounds[ax*2+1] > the_bounds[ax*2+1]:
                      the_bounds[ax*2+1] = bounds[ax*2+1]
              for ax in range(3):
                  update_axis(ax)
              return
  
          for actor in self._actors.values():
              if isinstance(actor, vtk.vtkCubeAxesActor):
                  continue
              if ( hasattr(actor, 'GetBounds') and actor.GetBounds() is not None
                   and id(actor) != id(self.bounding_box_actor)):
                  _update_bounds(actor.GetBounds())
  
          return the_bounds
docs: Bounds of all actors present in the rendering window