Resolved how to change device cam?

Hi there! Let's see if we can get to the bottom of this issue.

First off, we need some more information. What version of AR Foundation are you using? What have you tried already? Is it acceptable for you to change camera direction by switching scenes, or do you need to change camera direction within the same scene?

If you're using AR Foundation 4, we expose the `requestedFacingDirection` via `IUsesCameraTexture.RequestCameraFacingDirection`. If you add a script to the scene that implements `IUsesCameraTexture`, you should be able to request a world-facing camera. However, having tried this on my end, I ran into some trouble in this version of MARS, so I think this is a bug. I'll update this thread if I can figure out a workaround.

In the meantime, if you can switch between to scenes, one set up for face tracking, and one for world tracking, you should be able to use both types of AR in a single app.

Thanks for using MARS. Hope this helps!

 

Hi again.

I thought I'd share the script I am using to test this feature. I'm able to switch cameras but I'm seeing issues where MARS proxies don't match again after switching. Thankfully, these seem to be fixed in the latest update, which should be coming soon. Not knowing exactly how you have your scene set up, I can't be sure if you will see the same issues. In the meantime, see if this script does the trick:

Code (CSharp):

1. using Unity.MARS.Data;
2. using Unity.MARS.Providers;
3. using Unity.XRTools.ModuleLoader;
4. using UnityEngine;
5.  
6. namespace SwitchCameraTest
7. {
8.     public class SwitchCameraController : MonoBehaviour, IUsesPlaneFinding, IUsesPointCloud, IUsesSessionControl, IUsesCameraTexture
9.     {
10.         IProvidesPlaneFinding IFunctionalitySubscriber<IProvidesPlaneFinding>.provider { get; set; }
11.         IProvidesPointCloud IFunctionalitySubscriber<IProvidesPointCloud>.provider { get; set; }
12.         IProvidesSessionControl IFunctionalitySubscriber<IProvidesSessionControl>.provider { get; set; }
13.         IProvidesCameraTexture IFunctionalitySubscriber<IProvidesCameraTexture>.provider { get; set; }
14.  
15.         public void SwitchCamera()
16.         {
17.             var currentDirection = this.GetCameraFacingDirection();
18.             var requestUserDirection = currentDirection == CameraFacingDirection.World;
19.             var requestedDirection = requestUserDirection
20.                 ? CameraFacingDirection.User
21.                 : CameraFacingDirection.World;
22.  
23.             if (requestUserDirection)
24.             {
25.                 this.StopDetectingPlanes();
26.                 this.StopDetectingPoints();
27.             }
28.             else
29.             {
30.                 this.StartDetectingPlanes();
31.                 this.StartDetectingPoints();
32.             }
33.  
34.             this.PauseSession();
35.             this.RequestCameraFacingDirection(requestedDirection);
36.             this.ResumeSession();
37.         }
38.     }
39. }
40.  

 

Hi there

I believe this is expected. Are you expecting to track faces that are in view of the back camera? If so, this is not supported on ARKit or ARCore. On ARKit, it is possible to show the rear camera and do world tracking, while also tracking a face through the front-facing camera, as described here https://developer.apple.com/documen...mbining_user_face-tracking_and_world_tracking

 

@guiga_h @hiagotruta - can you let me know the version of MARS, Unity & AR Foundation you are using, as well as what model of phone you are deploying to? Or even better file a bug report from the editor.

I haven't been able to reproduce this yet.