LeapMotion + Unity：基于手指的角度在3D世界中移动对象

Question

I am trying to create an aiming system in Unity, where index finger is being used to control a crosshair. The game is being played with Oculus and Leap Motion is mounted on to the Oculus headset.

I have tried to calculate the position for the crosshair based on the angle of the index finger and draw a ray based on a given distance. I have also tried calculating the crosshair location just based on the direction of the index finger and given distance like this:

Vector3 targetPoint = direction * direction;

Here is what I have tried:

void Start () {
    crossHair = GameObject.Find("Crosshair Component");
    myCamera = GameObject.Find("CenterEyeAnchor");
    target = crossHair.transform;
    controller = new Controller(); 
    indexFinger = new Finger();

    void Update () {

    crossHair.transform.position = myCamera.transform.position;
    frame = controller.Frame();
    List<Hand> handList = new List<Hand>();
    for (int h = 0; h < frame.Hands.Count; h++)
    {
        Hand leapHand = frame.Hands[h];
        handList.Add(leapHand);
    }

    if (handList != null && frame.Hands.Count > 0) {
        indexFinger = frame.Hands[0].Fingers[(int)Finger.FingerType.TYPE_INDEX];
        if (indexFinger.IsExtended)
        {
            Vector3 fingerTipPos = indexFinger.TipPosition.ToUnityScaled();

            Vector3 originAngle = indexFinger.TipPosition.ToUnityScaled();
            Vector3 targetAngle = crossHair.transform.position;
            float distance = 1; 

            Vector3 direction = indexFinger.Direction.ToUnityScaled();
            Ray rayToTest = new Ray(originAngle, targetAngle);
            Vector3 targetPoint = rayToTest.GetPoint(distance);

            //Problem is here. How should these targetPoint values be used to calculate correct position for the crosshair?
            crossHair.transform.position = new Vector3(crossHair.transform.position.x + (targetPoint.x), y,
                                                    crossHair.transform.position.z + (targetPoint.z));
        }


    }
}

}

With similar calculations as these I have been able to move the crosshair accordingly on horizontal level by modifying x and z values but the y-axis seems to be the biggest problem. Y-axis seems to always receive too low values. The crosshair element is placed as a child element for the CenterEyeAnchor camera object in Unity.

So questions are: Is the way of calculating the target point position right as I have been trying to make it? What kind of calculations would I have to make for the crosshairs position based on the new target point value to make it behave accordingly to the index finger movement? Scaling factors for the values?

Answer 1

Pictures of the project setup and current object positions attached.

Here is the image for the setup of objects

Here is the image of the crosshair's false position