Unity Scene-to-Scene inter-object communication: HOW?

Question

Unity has an ability to have one scene act as a host for other sub-scenes, additively and asynchronously loaded, later in the game.

What are the ways an object in a host scene can know of and be sure of communicating with an object in an additively loaded sub-scene?

And the inverse, how can an object in the additively loaded scene communicate with an object in its host scene?

Answer 1

First, in Unity's UnityEngine.SceneManagement package, you can use SceneManager.GetSceneByName("scene name here") which returns Scene . If the scene is null, then the scene is not yet loaded. If it is, you can use isLoaded to check if it is loaded, SceneManager . You can either use Find after that, but I do not recommend this as it is a slow process.

Second, if the object you are referring to is a GameObject and you need a component attached to it, you can use Singleton pattern so you can access the only instance of the script. You can just assign instance = null under OnDestroy so that the instance will be gone when the scene is unloaded. This option is viable if the script is in the host scene since, I assume, it is not unloaded/destroyed.