unity HTC 模拟角色行走移动

public class WalkMove : MonoBehaviour 
{
    public SteamVR_Input_Sources Hand;
    [Header("vrHand与Hand是同一只手")]
    public Transform vrHand;      
    public Transform player;

    [Header("脚步声，跳跃声等的音频源")]
    public AudioSource audioSource;

   [Header("音效")]
   [Tooltip("脚步的音效")]        public AudioClip[] m_FootstepSounds;
   [Tooltip("角色的移动速度")]    public float walkSpeed = 5;
    private float currentSpeed;       //角色当前的速度

    private float m_NextStep;   //下一步的时间
    private float m_StepCycle;  //跳跃步骤周期
    [Range(0f, 1f)] public float m_RunstepLenghten=0.7f;  //步长加长
    public float m_StepInterval=5;                        //步入间隔

    public float angleSpeed = 2;            

    private CharacterController m_CharacterController;

    private Vector3 desiredMove;

    private bool m_IsWalking=false;

    private void Start()
    {
        m_StepCycle = 0f;
        m_NextStep = m_StepCycle / 2f;

        currentSpeed = walkSpeed;
        m_CharacterController = player.GetComponent<CharacterController>();
    }

    private void LateUpdate()
    {
        ControlMove();
    }

    /// <summary>
    /// 控制人物的移动
    /// </summary>
    private void ControlMove()
    {
        if (Input.GetKeyDown(KeyCode.LeftShift))
        {
            currentSpeed = 7;
        }
        if (Input.GetKeyUp(KeyCode.LeftShift))
        {
            currentSpeed = walkSpeed;
        }
    }

    private void FixedUpdate()
    {
     if (SteamVR_Actions._default.GrabPinch.GetState(Hand))
        {
            m_CharacterController.SimpleMove(new Vector3(vrHand.forward.x, 0, vrHand.forward.z) * 5);
            ProgressStepCycle(currentSpeed);
        }
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="speed"></param>
    private void ProgressStepCycle(float speed)
    {
        //Vector3.sqrMagnitude 是指长度的平方，也就是Vector3.magnitude的平方
        //比较向量的大小sqrMagnitude比magnitude的平方快，magnitude需要开平方
        if (m_CharacterController.velocity.sqrMagnitude > 0)
        {
            m_StepCycle += (m_CharacterController.velocity.magnitude + (speed * (m_IsWalking ? 1f : m_RunstepLenghten))) *
                         Time.fixedDeltaTime;
        }
        if (!(m_StepCycle > m_NextStep))
        {
            return;
        }
        m_NextStep = m_StepCycle + m_StepInterval;
        PlayFootStepAudio();
    }

    /// <summary>
    /// 角色移动时的音效
    /// </summary>
    private void PlayFootStepAudio()    
    {
        if (!m_CharacterController.isGrounded)
        {
            return;
        }
        int n = Random.Range(1, m_FootstepSounds.Length);
        audioSource.clip = m_FootstepSounds[n];
        audioSource.PlayOneShot(audioSource.clip);
        m_FootstepSounds[n] = m_FootstepSounds[0];
        m_FootstepSounds[0] = audioSource.clip;
    }
}