在VR场景完成统一（使用vuforia）后如何返回AR？

Question

我正在使用Unity + Vuforia进行AR / VR场景，我的VR场景由触发器调用，在场景之后我想回到AR。

public class GameManager : MonoBehaviour {

    public static GameManager instance;

    public GameObject[] planes;

    public TransitionManager mTransitionManager;

    public VideoPlayer[] vps;

    public void Awake(){
        instance = this;
    }

    // Use this for initialization
    void Start () {
        vps = new VideoPlayer[4];

        for (int i = 0; i < 4; i++) {
            vps [i] = planes [i].GetComponent<VideoPlayer> ();

            ARPort.SetActive (false);
        }

        StartCoroutine (StartSequence ());
    }

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

    }

    IEnumerator StartSequence(){
        //Wait for video [0] to finish

        yield return new WaitForSeconds((float)vps[0].clip.length);
        Destroy (planes [0]);

        planes [1].SetActive (true);

        //Wait for video [1] to finish
        yield return new WaitForSeconds((float)vps[1].clip.length);
        Destroy (planes [1]);
        planes [2].SetActive (true);

        //Wait for video [2] to finish
        yield return new WaitForSeconds((float)vps[2].clip.length);
        Destroy (planes [2]);
        planes [3].SetActive (true);

        //Wait for video [3] to finish
        yield return new WaitForSeconds((float)vps[3].clip.length);
        Destroy (planes [3]);

        //Now start AR part again

        MixedRealityController.Instance.SetMode (MixedRealityController.Mode.HANDHELD_AR);
    }

此代码启动相机几毫秒，之后再次打开VR场景。我怎样才能解决这个错误？

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