How to make a laser effect?

Question

Unity

I have a turret that shoots projectiles (TD type game), here is an implementation example

spoiler

public class TowerBullet : MonoBehaviour{
  public float FindRadius = 2f;
  public float TimeShot = 0.5f;
  Enemy enemy;
  Transform towerHead;
  private float timerShot = 0f;
  public GameObject bullet;
    
    void Start(){
    towerHead = transform.Find("Head");
    	}
  
    void Update(){
    if(enemy == null) FindEnemy();
      else{
        towerHead.LookAt(enemy.transform);
        shot();
        float dist = Vector3.Distance(enemy.transform.position, transform.position);
        if(dist > FindRadius) enemy = null;
        }
    	}
  
  public void shot(){
    timerShot -= Time.deltaTime;
    if(timerShot <= 0){
      timerShot = TimeShot;
      GameObject obj = (GameObject)Instantiate(bullet, towerHead.transform.position, towerHead.transform.rotation);
      Bullet b = obj.GetComponent<Bullet>();
      b.Enemy = enemy;
      }
    }
  
  public void FindEnemy(){
    GameObject[] enemies = GameObject.FindGameObjectsWithTag("Enemy") as GameObject[];
    float min = FindRadius;
    Enemy minEnemy = null;
    foreach(GameObject e in enemies){
      float dist = Vector3.Distance(e.transform.position, transform.position);
      if(dist <= min){
        min = dist;
        minEnemy = e.GetComponent<Enemy>();
        }
      }
    enemy = minEnemy;
    }
  }

public class Bullet : MonoBehaviour{
  public float Speed = 15f;
  public float TimeLife = 0.1f;
  float timerLife = 0f;
  public Enemy Enemy;
  public float Damage = 25f;
  public float Accuracy = 90f;
  public float Critical = 2f;
  public float Chance_Critical = 20f;
    void Start(){
    timerLife = TimeLife;
    }
  
    void Update(){
    timerLife -= Time.deltaTime;
    float _speed = Speed * Time.deltaTime;
    if(timerLife <= 0){
      timerLife = TimeLife;
      Object.Destroy(gameObject);
      }else if(Enemy != null && Vector3.Distance(transform.position, Enemy.transform.position) <= _speed){
        Enemy.SetDamage(Damage);
        Object.Destroy(gameObject);
        return;
        }
    transform.Translate(new Vector3(0,0, _speed));
    }
  }

A TowerBullet is attached to the tower, and everything works as it should to the Bullet bullets themselves - the tower tracks down the enemy, the bullets fly out and disappear when they hit, while causing the necessary damage.

How can I modify the script so that this tower fires a laser? (a beam that will start from the tower to the enemy and stretch when removed until it leaves the radius)

Answer 1

Try to look here about the beam (just on the example of TD)

Answer 2

1. Create a beam model
2. Stretch and rotate it
3. Repeat n2 in update