Checking for AR availability BEFORE launching AR scene?

I am trying to build some logic to test the device after app start to decide whether to allow for AR scene or only conventional 3D scene.
I know we can use

ARSubsystemManager.systemState

to check that but this works only when AR Session component is present in the scene, which means that there needs to be an attempt to initialize AR Session.
This is pretty expensive task that I would like to avoid straight after launching the app.

Is there any way around?

 

Thanks Tim, I tried ARSubsystemManager.checkAvailability() in a coroutine but is doesn't work unless AR Session is initilized - systemState is returning "Unsupported". When checking systemState in AR-enabled scene it works ok.

I guess it is due to these lines of code inside ARSubsystemManager.checkAvailability():

Code (CSharp):

1.             if (sessionSubsystem == null)
2.             {
3.                 systemState = ARSystemState.Unsupported;
4.             }

For me this means you need to try to initialize AR Session first to check whether it will work.
Of course I am considering this for an "AR-optional" app, where depending on the device compatibility the user is given either 3D-only or 3D+AR options.

 

Ended up doing like you said, thanks!

 

Hi @Saicopate, would you be willing to share what you did to establish AR availability? Thx!

 

Sure.
I run this at the start of non-AR scene (replace Debug.Log with your own implementation).

Code (CSharp):

1.    
2. private void OnEnable()
3.     {
4.         ARSubsystemManager.CreateSubsystems();
5.         StartCoroutine(ARSubsystemManager.CheckAvailability());
6.         StartCoroutine(AllowARScene());
7.     }
8.  
9. IEnumerator AllowARScene()
10.     {
11.         while (true)
12.         {
13.             while (ARSubsystemManager.systemState == ARSystemState.CheckingAvailability ||
14.                 ARSubsystemManager.systemState == ARSystemState.None)
15.             {
16.                 Debug.Log("Waiting...");
17.                 yield return null;
18.             }
19.             if (ARSubsystemManager.systemState == ARSystemState.Unsupported)
20.             {
21.                 Debug.Log("AR unsupported");
22.                 yield break;
23.             }
24.             if (ARSubsystemManager.systemState > ARSystemState.CheckingAvailability)
25.             {
26.                 Debug.Log("AR supported");
27.                 yield break;
28.             }
29.         }      
30.     }
31.