def active(self, state):
        """ Enables or disables this stage. In case the stage is disabled, it will
        not get updated anymore, and all stages are distabled """
        if self._active != state:
            self._active = state
            for target in itervalues(self._targets):
                target.active = self._active
 Enables or disables this stage. In case the stage is disabled, it will
        not get updated anymore, and all stages are distabled 
metadrive/render_pipeline/rpcore/render_stage.py