SceneManager.LoadSceneAsync is only working once

Question

So what's happening is that the LoadSceneAsync works perfectly...once. Then it fails to work the second time.

My game only has one level, so I only need to use this for the scene change between the main menu and the level scene. The first time this happens, it works perfectly, displaying the loading animation and then loading the level. However, after exiting the level and going back to the main menu and clicking the same start button, the script no longer works. The second time the loading script is called, the game switches to the loading screen, and then freezes.

Here is the script I am using: using UnityEngine; using System.Collections; using UnityEngine.UI; using UnityEngine.SceneManagement;

public class LoadingScreen : MonoBehaviour {

 AsyncOperation async;

 void Awake () {

 }

 // Use this for initialization
 void Start () {
     StartCoroutine("LevelSceneLoading");
 }
 
 // Update is called once per frame
 void Update () {
 
 }

 IEnumerator LevelSceneLoading() {
     yield return new WaitForSeconds (2);
     async = SceneManager.LoadSceneAsync("Level_Scene");
     while (!async.isDone) {
         Debug.Log(async.progress);
         yield return async;
     }
 }

}

The code has been revised to no longer include Destroy(gameObject); but still doesn't work.

Answer 1

Best Answer

Answer by TBruce · Oct 10, 2016 at 04:33 PM

Try removing this

 Destroy(gameObject);

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archelyte_vz · Oct 10, 2016 at 04:36 PM 0

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It unfortunately doesn't solve the issue. I actually added that after experiencing this problem, hoping it would reset the async.

TBruce archelyte_vz · Oct 10, 2016 at 06:28 PM 1

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It is important that you do not destroy the game object, otherwise you will not be able to continue processing in the current script or any other scripts attached to the current object (if any).

LoadSceneAsync() does not work completely as one would suspect. IsDone becomes true when progress reaches 1.0. Unfortunately progress only get to 90%. Check out the modified co-routine.

 IEnumerator LevelSceneLoading() {
     yield return new WaitForSeconds (2);
 
     async = Scene$$anonymous$$anager.LoadSceneAsync("Level_Scene");
 
     async.allowSceneActivation = false;
 
     while ((!async.isDone) && (async.progress <= 0.9f)) {
         Debug.Log(async.progress);
         yield return null;
     }
     async.allowSceneActivation = true;
     
     // now activate the scene
     Scene$$anonymous$$anager.SetActiveScene(Scene$$anonymous$$anager.GetSceneByName("Level_Scene")); 
 }

Answer 2

Answer by archelyte_vz · Oct 10, 2016 at 05:16 PM

The issue was in the return value

This is what the corrected Coroutine looks like: using UnityEngine; using System.Collections; using UnityEngine.UI; using UnityEngine.SceneManagement;

public class LoadingScreen : MonoBehaviour {

 AsyncOperation async;

 IEnumerator LoadLevelRealProgress () {
     yield return null;
     async = SceneManager.LoadSceneAsync("Level_Scene");
     StopCoroutine("LoadLevelRealProgress");
     while (!async.isDone) {
         Debug.Log(async.progress);
         yield return async;
     }
 }

}

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TBruce · Oct 10, 2016 at 06:50 PM 1

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The reason why this works is because the while loop never gets processed. See my latest response above.

Because async.progress never gets past 90%, async.isDone will always be false and the loop is never exited.

SceneManager.LoadSceneAsync is only working once

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