targeting particle

The targeting code below changes the color of the enemy with tab button to:

Target enemy= change color of enemy to 'green'

Deselect enemy = change color of enemy to 'blue' (press tab again)

I would like to change the target code to:

• target enemy = A transparent animated spotlight appears over the enemy (press tab)

• deselect enemy = spotlight disappears over time.0.08f. (press tab again)

I have the images for the spotlight ready! I just don't know how to implement them correctly! check it out!

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class Targetting : MonoBehaviour {
     public List<Transform> targets;
     public Transform selectedTarget;
 
     private Transform myTransform;
 
     // Use this for initialization
     void Start () {
         targets = new List<Transform>();    
         selectedTarget = null;
         myTransform = transform; 
 
         AddAllEnemies();
     }
 
     public void AddAllEnemies()
     {
         GameObject[] go = GameObject.FindGameObjectsWithTag("Enemy");
 
         foreach(GameObject enemy in go)
             AddTarget(enemy.transform);
     }
 
     public void AddTarget(Transform enemy)
     {
         targets.Add(enemy);
     }
 
 
     private void SortTargetsByDistance()
     {
         targets.Sort(delegate(Transform t1,Transform t2) { 
                 return Vector3.Distance(t1.position, myTransform.position).CompareTo(Vector3.Distance(t2.position, myTransform.position)); 
                 });
     }
 
 
     private void TargetEnemy()
     {
         if(selectedTarget == null)
         {
             SortTargetsByDistance();
             selectedTarget = targets[0];
         }
         else 
         {
             int index = targets.IndexOf(selectedTarget);
 
             if(index < targets.Count -1)
             {
                 index++; 
             }
             else
             {
                 index = 0;
             }
             DeselectTarget();
             selectedTarget = targets[index];
         }
         SelectTarget(); 
     }
 
     private void SelectTarget()
     {
         selectedTarget.renderer.material.color = Color.green;
     }
 
     private void DeselectTarget()
     {
         selectedTarget.renderer.material.color = Color.blue;
         selectedTarget = null;
     }
 
     // Update is called once per frame
     void Update()
     {
         if(Input.GetKeyDown(KeyCode.Tab))
         {
             TargetEnemy();
         }
     }
 
 }
 

 

any pointers in the right direction would be MUCH appreciated! I'm very new to this stuff! Thanks so much