OVRCameraRig - eye positions is different in GearVR to in Unity Editor

[rosss_mop]

I have an OVRCamearRIg (from the prefab) in my Unity Scene.. when i build and run the project on my Android Gear VR - the camera position... i.e. the player's head position is noticably lower than in the Unity Editor... OVRCameraRig and all its children is placed at 0,0,0 in the scene...
any clues?! thanks

[shomz]

I've noticed this as well, as of version 5.4.
There is no way to accurately position the camera for GearVR.

[Radiusmedia]

yes. somehow. can anyone fix that?

[bkane · Accepted solution]

We just ran into this today using Unity 5.4.2p4 and Oculus Utilities 1.9.0. It looks like there's some old code in OVRCameraRig.cs to work around a Unity bug that no longer applies. The workaround lowers the camera by a fair bit and I believe should be removed:

	private void Update()
	{
		EnsureGameObjectIntegrity();
		
		if (!Application.isPlaying)
			return;

		UpdateAnchors();

#if UNITY_ANDROID && !UNITY_EDITOR

        if (!correctedTrackingSpace)
        {
            //HACK: Unity 5.1.1p3 double-counts the head model on Android. Subtract it off in the reference frame.

            var headModel = new Vector3(0f, OVRManager.profile.eyeHeight - OVRManager.profile.neckHeight, OVRManager.profile.eyeDepth);
            var eyePos = -headModel + centerEyeAnchor.localRotation * headModel;

            if ((eyePos - centerEyeAnchor.localPosition).magnitude > 0.01f)
            {
                trackingSpace.localPosition = trackingSpace.localPosition - 2f * (trackingSpace.localRotation * headModel);
                correctedTrackingSpace = true;
            }
        }
#endif
	}

Lines 119-134 should probably be removed from Oculus Utilities altogether. By default this was in a folded region of "#region Unity Messages" so it's easy to miss.

[drash · Accepted solution]

Thanks bkane, this was very helpful!