How to make Touch Controls like mini Golf King - unity3d

Question

Goal
Hello Guys! I am new with unity 3-D . I want to make controls exactly like Mini Golf king . Like when ball stops pointers becomes visible on the screen . On clicking that pointer and dragged its scale changes and points always towards ball.
This is what I want to achieve
MY Approach
Initially according to my knowledge I Have implemented something using ray-cast. In the pointer I placed 3-d pointer as child object of ball . when i touch on the screen I send a ray cast to world from screen that detects Ball if i am touching Ball the i show Pointer and on every point on the screen i am continuously sending ray-casts on the world and changing pointer direction accordingly but i think it is not the good way on performance point
RaycastHit GenerateRayCast(Vector2 position, Camera camera,LayerMask mask) { // GENERATE RAY CAST AT GIVEN DIRECTION IN 3D WORLD
RaycastHit hito;
Ray ray = camera.ScreenPointToRay(position);
Physics.Raycast(ray, out hito, rayLength, mask);
return hito;
}
#endregion
#region Updatemethod
void FixedUpdate () {
if (IsBallInStopPos) { // IF BALL IN STATIC POSITOIN THEN LISTEN FOR TOUCH INPUTS
//if (Input.GetMouseButton(0) && !EventSystem.current.IsPointerOverGameObject())
if (Input.touchCount > 0 && !EventSystem.current.IsPointerOverGameObject()) // CHECK FOR SREEN TOUCH
{
touchInput = Input.touches[0];
// touchInput = Input.mousePosition; // get touch information
hitObject = GenerateRayCast(touchInput.position, Camera.main, mask);
if (touchInput.phase == TouchPhase.Began)
{
if (hitObject.collider.name == "Pointer") { // IF TOUCHED ON POINTER :
if (touchPointSet == false) {
touchPointSet = true;
touchStartPoint = hitObject.point; // SETTING START TOUCH POINT
}
}
}
else if (touchInput.phase == TouchPhase.Moved) {
newScale= Mathf.Clamp (Vector3.Distance(pointerChild.transform.position , hitObject.point),1f,2f);
pointerPivot.transform.localScale = Vector3.one * newScale;// SETTING SCALE ACCORDING TO DRAG VALUE
if (touchPointSet == true) { // WHEN TOUCH DRAGGED AND PREVIOULY POINTER IS TOUCHED ROTATE THE POINTER AT GIVEN DIRECTION
newDirection = new Vector3(hitObject.point.x, transform.position.y, hitObject.point.z);
transform.LookAt(2 * transform.position - newDirection);
canShoot = true;
}
}
}
else if (touchInput.phase == TouchPhase.Ended)
{
if (newScale <= 1f)
return;
if (IsBallInStopPos && canShoot )
{
//shooted = true;
newScale = newScale -1;// AS SCALE VALUE IS BETWEEN 1 AND 2 SO SUBSTACT FROM TO MAKE IT BETWEEN
pointerPivot.gameObject.SetActive(false);
rigidBody.constraints = RigidbodyConstraints.None;
GetComponent<Rigidbody>().AddRelativeForce(new Vector3(0f, 0f, 10000f * newScale));
// Time.timeScale = 2f;
canShoot = false;
IsBallInStopPos = false; // AFTER SHOOT : after the ball is shooted now the ball is not in staticstatic condition
}
}
}