def _initialize_managers(self):
        """ Internal method to initialize all managers, after they have been
        created earlier in _create_managers. The creation and initialization
        is seperated due to the fact that plugins and various other subprocesses
        have to get initialized inbetween. """
        self.stage_mgr.setup()
        self.stage_mgr.reload_shaders()
        self.light_mgr.reload_shaders()
        self._init_bindings()
        self.light_mgr.init_shadows()
 Internal method to initialize all managers, after they have been
        created earlier in _create_managers. The creation and initialization
        is seperated due to the fact that plugins and various other subprocesses
        have to get initialized inbetween. 
metadrive/render_pipeline/rpcore/render_pipeline.py