AR开发-（三）Leap Motion的上手使用

终于到了要应用的时候了，我们可以摆放一些3D物体让我们的物体丰富起来，这也是做项目的初衷。

修改触碰到方块的颜色

具体做法也比较简单，可以控制是那一个指头碰到的。达到这种程度也就没有什么可以说的了。足够用了！

Leap Motion 的具体用法

• LeapMotion 用法一：
  如何抓取一个物体？

public class MyFinger : MonoBehaviour {

LeapProvider pro;
public LeapTransform t;
void Start () {
    pro = FindObjectOfType () as LeapProvider;

}

void Update () {
    Frame frame = pro.CurrentFrame;

    foreach (Hand hand in frame.Hands) {
        if (hand.IsLeft) {
            if ( Vector3.Distance (this.transform.position, hand.PalmPosition.ToVector3 ()) < 1f) {
                transform.position = hand.PalmPosition.ToVector3 () + hand.PalmNormal.ToVector3 () * (transform.localScale.y * .5f + .02f);
                transform.rotation = hand.Basis.CalculateRotation ();
            }
        }
    }
}

}
```

• LeapMotion 用法二：
  hand.grabAngle()返回的是除却大拇指四根手指的平均弯曲程度，所以紧握拳头的时候数值为3.14

public class MyPinch : MonoBehaviour {

    public float minDistance;
    public float maxdistance;
    public float pinchStart;
    public float pinchToEnd;
    public HandModel m_hand;
    public GameObject m_cube;
    private bool m_isPinching = false;

    void Start () {
        m_hand = GetComponent ();
    }

    void Update () {
        Vector3 indexPosition = m_hand.fingers [1].GetBoneCenter (3);
        Vector3 thumbPosition = m_hand.fingers [0].GetBoneCenter (3);
        float distance = (indexPosition - thumbPosition).magnitude;
        float nomalizedDistance = (distance - minDistance) / (maxdistance - minDistance);
        float pinch = 1.0f - Mathf.Clamp01 (nomalizedDistance);
        Debug.Log ("Current pinch strength" + pinch);
        Debug.Log ("pinch" + m_hand.GetLeapHand ().PinchStrength);

        if (pinch > pinchStart) {
            m_isPinching = true;
        } else if (pinch< pinchToEnd){
                m_isPinching = false;
        }
    }
}