How do I make an enemy ai to stop shooting when the target is behind an object with a collider?

Physics
1

I found this C# code on the internet and it works fine but the enemy shoots even when the player is behind a wall:

blaster is the gun where the bullet comes out off

using UnityEngine;
using System.Collections;
public class enemy_ai_c : MonoBehaviour {
    public Transform player;
    public float range = 50.0f;
    public float bulletImpulse= 10.0f;
    private bool onRange= false;
    public Rigidbody projectile;
public GameObject blaster;
    void Start(){
        float rand = Random.Range (1.0f, 2.0f);
        InvokeRepeating("Shoot", 2, rand);
    }
    void Shoot(){
        if (onRange){
            Rigidbody bullet = (Rigidbody)Instantiate(projectile, blaster.transform.position + transform.forward, transform.rotation);
            bullet.AddForce(transform.forward*bulletImpulse, ForceMode.Impulse);
      
            Destroy (bullet.gameObject, 2);
        }

 
 
}
    void Update() {
        onRange = Vector3.Distance(transform.position, player.position)<range;
        if (onRange)
            transform.LookAt(player);
    }
 
}
2

You have to create a script to tell what are directions. Once you have created that. You need to create another class to check that if enemy or game character left/right/front/back is wall don’t shoot.

3

Your best bet would be to use raycast.

4

Or even a simpler one. Use 4 box collider(tick trigger) and OnTriggerEnter. It’s a bit messy however it will work for a start.

5

Just do a raycast, if they are in range do a raycast from the npc to the target, and check if it hits anything that isn’t the npc

6

I’m thinking of that too as last resort but yeah Raycast would be idea. Good suggestions.

Here is the finished code for some beginners to use:

The enemy ai would face the player if it was at a certain distance and the ai will face the player if it is behind it but will shoot only if it is the player.

using UnityEngine;
using System.Collections;
public class enemy_ai_c : MonoBehaviour {
    public Transform player;
    public float range = 50.0f;
    public float bulletImpulse= 10.0f;
    private bool onRange= false;
    public Rigidbody projectile;
public GameObject blaster;
    void Start(){
        float rand = Random.Range (1.0f, 2.0f);
        InvokeRepeating("Shoot", 0.50f, rand);
    }
    void Shoot(){
        if (onRange){
            Ray ray = new Ray(transform.position, transform.forward);
RaycastHit hit;
  if (Physics.Raycast(ray, out hit, 100))
{
     if (hit.collider.gameObject.layer == 0) {
            Rigidbody bullet = (Rigidbody)Instantiate(projectile, transform.position + transform.forward, transform.rotation);
            bullet.AddForce(transform.forward*bulletImpulse, ForceMode.Impulse);
      
            Destroy (bullet.gameObject, 2);
        }}}

 
 
}
    void Update() {



        onRange = Vector3.Distance(transform.position, player.position)<range;
       if (onRange)
          transform.LookAt(player);
    }
 
}
7

Well, you could use a Raycast to detect the Obstacles in the same range as the Player detection range, and if it finds noting, then Raycast to see if there is a player, and if there is a player, shoot.

8

I wouldn’t do an instantiate each time you shoot. You should look into object pooling.