旋转捕捉回零

Question

下面的代码旋转一个对象并根据控制器上操纵杆的角度移动它们：

using UnityEngine;
using System.Collections;

public class PlayerControllerTEST : MonoBehaviour
{

    public float moveSpeed;
    public float h;
    public float v;
    public float moveX;
    public float moveZ;
    public Rigidbody rb;

    // Use this for initialization
    void Start()
    {

        rb = GetComponent<Rigidbody>();

    }

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

        h = Input.GetAxis("Horizontal");
        v = Input.GetAxis("Vertical");

        moveX = (h * moveSpeed) * Time.deltaTime;
        moveZ = (v * moveSpeed) * Time.deltaTime;

        transform.Translate(moveX, 0f, moveZ, Space.World);

        Quaternion rotate = Quaternion.Euler(0f, (Mathf.Atan2(h, v) * Mathf.Rad2Deg), 0f);

        Debug.Log(rotate);

        rb.MoveRotation(rotate);
    }
}

然而，当我松开操纵杆时，物体会回到0度的角度。我不知道在操纵杆基本上放开之前我怎么能保持角度。