Setting up the player tank and aspect

Our Target object is a simple sphere game object with the mesh render removed, so that we end up with only the Sphere Collider. 

Look at the following code in the Target.cs file:

using UnityEngine;

public class Target : MonoBehaviour
{
    public Transform targetMarker;

    void Start (){}

    void Update ()
    {
        int button = 0;

        //Get the point of the hit position when the mouse is being clicked
        if(Input.GetMouseButtonDown(button)) 
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hitInfo;

            if (Physics.Raycast(ray.origin, ray.direction, out hitInfo)) 
            {
                Vector3 targetPosition = hitInfo.point;
                targetMarker.position = targetPosition;
            }
        }
    }
}

Note

You'll notice we left in an empty Start method in the code. While there is a cost in having empty Start, Update, and other MonoBehaviour events that...