mutli set switching, please help
 

hello i have a palace with two sets, interior and exterior, i want to do a walkthrough, firstly i want to display the exterior set, and when the camera enters the palace i want to display the interior set, my question is : whats the best way to do this, shall i use visibility control or load/unload? and how to apply i mean when to switch between these two sets?
thank you in advance

You could add the models to different scenes and switch between scenes or toggle the visibility of the models.