How understand what user use (seated or standing position)?

Some of the games I've worked on provide internal values for both standing and seating positions. They measure the head GameObjects world position center, with values typically ranging from 1.10 to 1.40 for seated positions and above 1.40 for standing positions.

Under OVRCameraRig/TrackingAnchor is a "CenterEyeAnchor" object that gets updated with the real-time position of the bridge of your nose. That should give you a good position to base your panel position from.

In additional i noticed that this solution sometimes works not good. CenterEyeAnchor. Has wrong Y (when i sit it returns wrong Y like i stand)

I've made a little test. 

I add the following code to write Y from centerEyeAnchor.position.y :

private void LateUpdate()
    {
        if (App.Instance.OVRCameraRig.centerEyeAnchor != null)
        {
            Transform centerEyeAnchor = App.Instance.OVRCameraRig.centerEyeAnchor;

            DebugArea.Info(
                "centerEyeAnchor: {0} {1}",
                centerEyeAnchor.position.y,
                centerEyeAnchor.forward.y
            );
        }
    }

And i see that Y changed from 1.01 to 1.7 when i rotate headset around X without changes headset position. And this is cause of my issue. 

I'm happy to try your project in my environment if you want to make it available to me.

My issue easy fixed. When i calculate Y i add forward vector and it afcouse move Y 😉 It because i copy this part from another part of my code and forgot to delete it. 

Here is fixed component: 

public class EyeLevel : MonoBehaviour
{
    private void OnEnable()
    {
#if !UNITY_EDITOR
        PlaceToEyeLevel();
#endif
    }

    private void PlaceToEyeLevel()
    {
        if (App.Instance.OVRCameraRig.centerEyeAnchor != null)
        {
            Transform centerEyeAnchor = App.Instance.OVRCameraRig.centerEyeAnchor;
            var calculatedY = (
                centerEyeAnchor.position + new Vector3(0f, 0f, transform.position.z)
            ).y;

            transform.localPosition = transform
                .localPosition
                .Let(it =>
                {
                    it.y = calculatedY;
                    return it;
                });
        }
    }
}