Unity Quest 3 Passthrough Mirroring to PC Screen via Oculus Link

Hi everyone,

I'm developing a Unity Mixed Reality app using the Meta All-in-One SDK with OVRCameraRig and OVRPassthroughLayer. The app runs on Quest 3 via Oculus Link (USB cable) and works perfectly inside the headset — passthrough and virtual content both display correctly.

However, I need to mirror the full passthrough view (real-world camera feed + virtual content) to a PC screen as a Screen Space UI inside my Unity app window.

What I've tried:

• OVRMirrorCapture using secondary Camera + RenderTexture → only shows virtual layer, passthrough background is black

• PassthroughCameraAccess (Meta MRUK Building Block) → fails with error: 'CameraGetLatestImage is only supported on Android'

• OVRDisplay.GetEyeTextureForMirror() → method doesn't exist in current SDK

• XRDisplaySubsystem APIs → methods not available in current Meta XR SDK

I've seen the official GitHub issue (#48 on Unity-PassthroughCameraApiSamples) where a Meta developer confirmed Passthrough Camera API is not supported over Link yet and will be in a future release.

My questions:

1. Is there any currently supported method to get the full passthrough feed (including real-world camera) into a Unity RenderTexture or UI element on PC via Link?

2. Is Mixed Reality Capture (MRC) a viable path for this use case?

3. Are there any workarounds available while we wait for official Link support?

Any help or direction would be greatly appreciated. Thank you!