ARKit scene loading causes a flash / flicker

Question

I'm using the ARKit plugin and can't seem to track down the cause of this one. I have a main menu scene that loads a gameplay scene. The gameplay scene features all of the ARKit stuff from the MultiARManager asset.

When testing builds on iPhones, we see a flashing / flicker during the transition between these two scenes. It doesn't happen every single time the scene is loaded, but happens consistently when launching the app for the first time, or after manually closing it and re-opening it.

I tried creating a transition that would cover the screen during this but it didn't work. That seems kind of hacky anyways. I'm hoping someone else can help shed some light on the issue.

Here is my code that loads the scene.

 IEnumerator LoadingSceneRealProgress(string sceneName) {
             //yield return new WaitForSeconds(0);
             _scene = SceneManager.LoadSceneAsync(sceneName, LoadSceneMode.Single);
             
             
             // disable scene activation while loading to prevent auto load
             _scene.allowSceneActivation = true;
 
             while (!_scene.isDone) {
                 //loadingProgbar.value = _scene.progress;
                 LoadProgressPercent = _scene.progress;
                 
                 if (_scene.progress >= LoadReadyPercent)
                 {
                     
                     LoadComplete = true;
                     if (_applicationManager != null)
                     {
                         ApplicationManager.OnSceneLoaded(_scene);
                     }
                     if (_simulationManager != null)
                     {
                         SimulationManager.OnSceneLoaded(_scene);
                     }
                     
                     
                 }
                 //Debug.Log(_scene.progress);
                 yield return null;
             }
         }

Answer 1

Okay I believe I had fixed this by taking the following steps.

First I created a custom GameObject I called "ARCreator". This object has a script that references the MultiARController prefab, and also the ARKitRemoteController prefab for testing. It also refs the info text debug canvas, but that part isn't required.

Next, set your scene's camera background color to black for good measure. I am fading to black from my main menu so this may not be applicable for you.

On ARCreator object I use this script:

 public class ARCreator : MonoBehaviour
     {
 
         public static ARCreator Instance;
 
         public GameObject MultiARPrefab;
         public GameObject ARRemotePrefab;
         public Text InfoText;
     
         //
         void Awake()
         {
             Instance = this;
         }
         
         //
         public void Init ()
         {
             GameObject multiAR = Instantiate(MultiARPrefab, Vector3.zero, Quaternion.identity);
             multiAR.GetComponent<MultiARManager>().infoText = InfoText;
             Instantiate(ARRemotePrefab, Vector3.zero, Quaternion.identity);
         }
     }

And In my SimulationManager's Update method:

 //
         private void Update()
         {
             // Start the ARCreator
             // This delay exists to help resolve the screen flickering
             if (!_arInitialized && ARCreator.Instance != null)
             {
                 _arInitialized = true;
                 StartCoroutine(ARInitDelay());
             }
         }
         
         //
         IEnumerator ARInitDelay()
         {
             yield return new WaitForSeconds(1);
             ARCreator.Instance.Init();
         }

Answer 2

Answer by arturmandas · Nov 20, 2017 at 10:38 AM

Same thing here, I will try an inbetween scene with no camera.

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ifeltdave · Nov 20, 2017 at 05:35 PM 0

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Thanks for the input, I think I'll give that a shot today.

Another thing I plan to try is simply delaying the initialization of the AR$$anonymous$$it stuff in the second scene. I have a sneaking suspicion that things are still firing up with activating the camera, computing the 3D camera, all at once.

I'll report back with the results, knowing someone else has the issue makes me wanna make sure we can mark this resolved for future users who might be googling for it.

Answer 3

Answer by aledwa · May 09, 2018 at 08:01 AM

Hey there!

i have the same issue but the solution is not working. I am not using the MultiARManager Asset. I just have a startscene with a button to load the arkitscene. When loading arkitscene the flickering is there for about 1 second.

Does any other of the other ideas worked?

i have no idea how to fix..

Thanks a lot! Aljoscha

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Answer 4

Answer by slow_izzm · May 19, 2018 at 06:32 PM

I have this same issue, but a little different scenario. I am starting my scene with artoolkit and detecting an image that disables artk and enables arkit, but when arkit enables I get the flicker. I believe I have narrowed it down to the arcameramanager ... I don't want to pay for image detection, this is why I have chosen artk over vuforia, artk is working great when it comes to image detection, but I prefer arkit when it comes to everything else atm. If anyone has any ensight/directon on this, it would be much appreciated.

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ARKit scene loading causes a flash / flicker

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