Building a turret without shooting

Unity Engine
1

Hi there, I’m trying to build a turret in a tower defence that kills the enemies but doesn’t shoot, so it’s a range tower. When I find the enemy then I want to destroy() but it doesn’t let me do it.

using UnityEngine;

using UnityEngine;

public class Firewall : MonoBehaviour
{



    [Header("Attributes")]
    public float range = 0.6f;

    [Header("Unity Setup")]
    public string enemyTag = "Enemy";
    public Transform target;


    void Start(){
      InvokeRepeating("UpdateTarget", 0f, 0.5f);
    }

    private void UpdateTarget()
    {
      GameObject[] enemies = GameObject.FindGameObjectsWithTag(enemyTag);
      float shortestDistance = Mathf.Infinity;
      GameObject nearestEnemy = null;

      foreach(GameObject enemy in enemies)
      {
        float distanceToEnemy = Vector2.Distance(transform.position, enemy.transform.position);
        if(distanceToEnemy < shortestDistance)
        {
          shortestDistance = distanceToEnemy;
          nearestEnemy = enemy;
       
        }
      }

      if(nearestEnemy != null && shortestDistance <= range)
      {
        target = nearestEnemy.transform;
      } else
      {
        target = null;
      }

    }


    public void Impact()
    {
      Debug.Log("Impact with virus");
      Destroy(target.gameObject);
    }

    void OnDrawGizmosSelected()
    {
      Gizmos.color = Color.red;
      Gizmos.DrawWireSphere(transform.position, range);

    }

  }
2

When is Impact() called? It looks like your logic for finding the nearest enemy is working fine, but I don’t see when that nearest enemy is supposed to be destroyed.

3

Sorry I uploaded the wrong one, When I add impact() here, the it kills only the first one

if(nearestEnemy != null && shortestDistance <= range)
      {
        target = nearestEnemy.transform;
        Impact();
      } else
      {
        target = null;
      }