unity3d：htcvive vrtk擷取搖桿的速度

方案1：VRTK原生api方式

void CtrlReferInit1()
    {
        m_leftCtrlRefer = VRTK_ControllerReference.GetControllerReference(m_leftController);

        Debug.Log("Left: " + VRTK_SDK_Bridge.GetControllerIndex(VRTK_DeviceFinder.GetControllerRightHand()));


        m_rightCtrlRefer = VRTK_ControllerReference.GetControllerReference(m_rightController);

        Debug.Log("Right:" + VRTK_SDK_Bridge.GetControllerIndex(VRTK_DeviceFinder.GetControllerRightHand()));
    }      

public float GetControllerVelocity(SDK_BaseController.ControllerHand handType )
    {
        float speed = 0;
        switch (handType)
        {
            case SDK_BaseController.ControllerHand.Left:
                speed = VRTK_DeviceFinder.GetControllerVelocity(m_leftCtrlRefer).magnitude;
                break;
            case SDK_BaseController.ControllerHand.Right:
                speed = VRTK_DeviceFinder.GetControllerVelocity(m_rightCtrlRefer).magnitude;
                break;
            default:
                break;
        }
        return speed;
    }      

但是這樣得到速度很不準确，有時候靜止也會有速度産生。并且初始化條件苛刻，要開始運作時，搖桿就處于激活狀态。

protected virtual void Update()
        {
            float dis = Vector3.Distance(transform.position, m_lastPos);
            float speed = dis / Time.deltaTime;
            m_lastPos = transform.position;
         }