Correct use of Application.UnloadLevel ?

Questions & Answers
1

I’m trying to use the newly added Application.UnloadLevel to unload an existing scene after loading a new one in additively in Unity 5.2 but keep getting the error:

Unloading the first loaded scene Temp/__EditModeScene (index -1), is currently not supported
UnityEngine.Application:UnloadLevel(Int32)

I can’t seem to find much on the correct use of this method, not even the docs give an example piece of code so I was wondering if someone could take a look at my code and see if there’s anything obvious I am doing wrong.

Cheers

public class SceneSwitcher : MonoBehaviour {

    private void Awake()
    {
        DontDestroyOnLoad(gameObject);
    }

    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.L))
        {
            StartCoroutine(SwitchScene());
        }
    }

    private IEnumerator SwitchScene()
    {
        //load new scene
        AsyncOperation loadNewScene = Application.LoadLevelAdditiveAsync(1);

        while (!loadNewScene.isDone)
        {
            yield return new WaitForEndOfFrame();
        }

        print("Scene Loaded");

        //unload current/old scene
        bool unloaded = Application.UnloadLevel(0);

        while (!unloaded)
        {
            yield return new WaitForEndOfFrame();
        }

        print("Scene Unloaded");

        //unload the unused assets/lightmaps
        AsyncOperation unloadCurrentSceneAssets = Resources.UnloadUnusedAssets();

        while (!unloadCurrentSceneAssets.isDone)
        {
            yield return new WaitForEndOfFrame();
        }

        print("Unused Assets Removed");
    }
}
2

@TheWoulfe You only can unload levels that was loaded additively (Application.LoadLevelAdditive or Application.LoadLevelAdditiveAsync).

And error means you trying to unload level that was loaded by Application.LoadLevel or Application.LoadLevelAsync.

So Maybe in first scene you should maybe just instantiate character (or something that you will not unload) and than additively load environment.