Vision cone with obstacles?

Hello !, I made a script of a collider trigger because it was my only alternative, it works, when the player enters the cone trigger (mesh) the enemy is disturbed, but you can see me through obstacles like walls, someone knows something?

 using System.Collections;
 
 public class VisionCone : MonoBehaviour {
 
     public GameObject EnemyGameObject;
     public GameObject Player;
 
     void Start () 
     {
 
     }
     
     void OnTriggerEnter (Collider other) 
     {
         if (other.tag == "Player") {
 
         EnemyGameObject.gameObject.GetComponent<Enemy>().Distancia = EnemyGameObject.gameObject.GetComponent<Enemy>().DetectedDistance; 
         EnemyGameObject.gameObject.GetComponent<Enemy>().LastDistance = EnemyGameObject.gameObject.GetComponent<Enemy>().DetectedLastDistance;  
     }
   }
 }