How to do it...

To create a point-and-click game using a Raycast, do the following:

1. Remove the Tile Manager (Script) component from the Main Camera GameObject.
2. Create a new 3D Sphere, named Sphere-destination, scaled to (0.5, 0.5, 0.5).
3. Create a new Material object that's red and assign it to the Sphere-destination GameObject.
4. Create a new MoveToClickPoint C# script class containing the following and add an instance object as a component to the Sphere-arrow GameObject:

using UnityEngine;
using UnityEngine.AI;

public class MoveToClickPoint : MonoBehaviour {
   public GameObject sphereDestination;
   private NavMeshAgent navMeshAgent;
   private RaycastHit hit;

   void Start() {
      navMeshAgent = GetComponent<NavMeshAgent>();
      sphereDestination.transform.position = transform.position;
    }

    void Update() {
       Ray rayFromMouseClick = Camera.main.ScreenPointToRay(Input.mousePosition);

       if (FireRayCast(rayFromMouseClick)){
         ...