在现实世界中,如何将ARkit中的模型指向北极?

嗨,我试着做一个北向的模型。如何在现实世界中得到北极的方向。

public class PointNoeth : MonoBehaviour {

// Use this for initialization
//void Start () 
IEnumerator Start()
{
    // First, check if user has location service enabled
    if (!Input.location.isEnabledByUser)
        yield break;

    // Start service before querying location
    Input.location.Start();

    // Wait until service initializes
    int maxWait = 20;
    while (Input.location.status == LocationServiceStatus.Initializing && maxWait > 0)
    {
        yield return new WaitForSeconds(1);
        maxWait--;
    }

    // Service didn't initialize in 20 seconds
    if (maxWait < 1)
    {
        print("Timed out");
        yield break;
    }

    // Connection has failed
    if (Input.location.status == LocationServiceStatus.Failed)
    {
        print("Unable to determine device location");
        yield break;
    }
    else
    {
        // Access granted and location value could be retrieved
        print("Location: " + Input.location.lastData.latitude + " " + Input.location.lastData.longitude + " " + Input.location.lastData.altitude + " " + Input.location.lastData.horizontalAccuracy + " " + Input.location.lastData.timestamp);
    }

    // Stop service if there is no need to query location updates continuously
    Input.location.Stop();

    Input.compass.enabled = true;
}

// Update is called once per frame
void Update () 
{

    transform.rotation = Quaternion.Euler(0, -Input.compass.trueHeading, 0);

    /
}
}

在“更新”功能中,我设置了旋转。我将箭头标记保留为模型。最初,我将其指向z方向,但当我单击“播放”时,它将更改为-x轴。当我签入设备时,也会发生同样的情况。当我使用手机中的工具检查现实世界中的北极时,它指向的方向正好相反。因此,如何将模型指向北极 .