NRCameraRigParent.cs

using UnityEngine;

public class NRCameraRigParent : MonoBehaviour
{
    [SerializeField]
    private Transform ARCameraTransform = null;

    private Transform NrCameraRigTransform;

    private void Awake()
    {
        this.NrCameraRigTransform = transform.GetChild(0);
    }

    private void Update()
    {
        transform.position = ARCameraTransform.position;
    }

    public void RecenterCamera()
    {
        // Android 端末の水平方向の回転と Nreal の回転を一致させる

        var arCameraYaw = GetYawRotation(this.ARCameraTransform.forward);
        var nrCameraYaw = GetYawRotation(this.NrCameraRigTransform.forward);
        var parentYaw = GetYawRotation(transform.forward);

        parentYaw = parentYaw + arCameraYaw - nrCameraYaw;
        var rotation = Quaternion.AngleAxis(parentYaw, Vector3.up);
        transform.rotation = rotation;
    }

    private float GetYawRotation(Vector3 forward)
    {
        var x = forward.x;
        var z = forward.z;
        return Mathf.Atan2(x, z) * Mathf.Rad2Deg;
    }
}