How to wait until additive scene is set to active before calling Start() on GameObjects.

Unity Engine
1

I want to do some logic in a script’s Start() depending on which scene it’s GameObject is in.
However, Start() is called before the scene is set to active, so I cannot use if(!SceneManager.GetActiveScene().name.Equals(Constants.SCENE_MAIN)).

I load my scenes like this:

private IEnumerator LoadAsyncSceneAdditive(string scene)
    {
        AsyncOperation asyncLoad = SceneManager.LoadSceneAsync(scene, LoadSceneMode.Additive);

        Debug.Log("Loading Scene: " + scene + "...");

        while (!asyncLoad.isDone)
        {
            yield return null;
        }

        Debug.Log("Finished loading Scene: " + scene);

        SceneManager.SetActiveScene(SceneManager.GetSceneByName(scene));
    }

How can I switch from Scene A to Scene B, and make sure that no Start() functions are called in Scene B before it is set as the active scene?

Really any solution that will allow a reliable check of which scene the GameObject is in on Start()…

2

I’m not exactly sure, but have you tried playing around with the allow scene activation flag? It looks like it could work for you?

3

I have a little bit, it seems it’s for delaying the activation of a scene. Which is not what I want. Or did you have some other idea?

4

That’s a pity. If there really isn’t a way of delaying the calls, I wonder if you would be left with having to keep track of your own ‘current scene’ and refer to that rather than through the Unity API?

5

I think I might have figured out a solution that will work for me. I put all GameObjects in a Parent-Object with a Script referencing the scene name (manually input via inspector). Then I use transform.root and get the referenced Scene :slight_smile:

6

Glad you figured out a way round it. :slight_smile:

7

If you want the scene the GameObject is a member of:

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8

Another way is to change all the interesting Start’s to hand-called public inits(). After your waiting for the load is done, you can hand-set whatever you need to, in the new scene, then call init() on them all.

It’s a small pain, but it also makes it so you don’t have to play with script execution order, since you call the init()s in whatever order you want. It’s a “hammer” solution in that it’s not pretty and won’t impress anyone with clever use of Unity features, but it always works.

1 Like