Pointer.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PointerTest : MonoBehaviour {

	private LineRenderer pointer;

	private void Start () {

		pointer = this.GetComponent<LineRenderer>();

		pointer.numPositions = 2;

	}

	private void Update () {

		pointer.SetPosition (0, this.transform.position);   

		RaycastHit hit;

		if (Physics.Raycast (this.transform.position, this.transform.forward * 10f, out hit, 100)) {

			if (hit.collider.tag == "Point") {
				pointer.SetPosition (1, hit.point);
				EnablePointer ();
			} else {
				DisEnablePointer ();
			}
		} else {
			DisEnablePointer ();
		}
	}

	private void EnablePointer () {
		pointer.enabled = true;
	}

	private void DisEnablePointer () {
		pointer.enabled = false;
	}
}