How can I make my enemy AI stop shooting the player if they are behind the wall?

Unity Engine
,
1

I am pretty new to unity and now working with enemy AI for my game. I made some progress and added attack, chase and patroling states but now I am stuck with one issue where enemy tries to shoot through walls. Is there any way to fix this? Here is my enemy AI script:

using UnityEngine;
using UnityEngine.AI;

public class EnemyAi : MonoBehaviour
{
    public NavMeshAgent agent;

    public Transform player;

    public LayerMask whatIsGround, whatIsPlayer;

    public int maxHealth;
    public int currentHealth;
    Ragdoll ragdoll;
    public bool isDead;

    //Patroling
    public Vector3 walkPoint;
    bool walkPointSet;
    public float walkPointRange;

    //Attacking
    public float timeBetweenAttacks;
    bool alreadyAttacked;
    public GameObject projectile;
    public Transform projectilePos;

    //States
    public float sightRange, attackRange;
    public bool playerInSightRange, playerInAttackRange;

    Animator animator;

    private void Awake()
    {
        currentHealth = maxHealth;
        player = GameObject.Find("Player").transform;
        agent = GetComponent<NavMeshAgent>();
        animator = GetComponent<Animator>();
        ragdoll = GetComponent<Ragdoll>();
    }

    private void Update()
    {
        //Check for sight and attack range
        playerInSightRange = Physics.CheckSphere(transform.position, sightRange, whatIsPlayer);
        playerInAttackRange = Physics.CheckSphere(transform.position, attackRange, whatIsPlayer);

        if (!playerInSightRange && !playerInAttackRange) Patroling();
        if (playerInSightRange && !playerInAttackRange) ChasePlayer();
        if (playerInAttackRange && playerInSightRange) AttackPlayer();

        animator.SetFloat("Speed", agent.velocity.magnitude);
    }

    private void Patroling()
    {
        if (!walkPointSet) SearchWalkPoint();

        if (walkPointSet) agent.SetDestination(walkPoint);

        Vector3 distanceToWalkPoint = transform.position - walkPoint;

        //Walkpoint reached
        if (distanceToWalkPoint.magnitude < 0.1f) walkPointSet = false;
    }

    private void SearchWalkPoint()
    {
        //Calculate random point in range
        float randomZ = Random.Range(-walkPointRange, walkPointRange);
        float randomX = Random.Range(-walkPointRange, walkPointRange);

        walkPoint = new Vector3(transform.position.x + randomX, transform.position.y, transform.position.z + randomZ);

        if (Physics.Raycast(walkPoint, -transform.up, 2f, whatIsGround)) walkPointSet = true;
    }

    private void ChasePlayer()
    {
        agent.SetDestination(player.position);
    }

    private void AttackPlayer()
    {
        //Make sure enemy doesn't move
        agent.SetDestination(transform.position);

        transform.LookAt(player);

        if (!alreadyAttacked)
        {
            //Attack code here
            Rigidbody rb = Instantiate(projectile, projectilePos.position, projectilePos.rotation).GetComponent<Rigidbody>();
            rb.AddForce(transform.forward * 32f, ForceMode.Impulse);
            rb.AddForce(transform.up * 0f, ForceMode.Impulse);
            animator.SetTrigger("Shoot");

            alreadyAttacked = true;
            Invoke(nameof(ResetAttack), timeBetweenAttacks);
        }
    }

    private void ResetAttack()
    {
        alreadyAttacked = false;
    }

    public void TakeDamage(int damage)
    {
        currentHealth -= damage;
        if (currentHealth <= 0)
        {
            Die();
        }
    }

    private void Die()
    {
        isDead = true;

        EnemyAi enemyMovement = GetComponent<EnemyAi>();
        NavMeshAgent enemyMovement2 = GetComponent<NavMeshAgent>();
        if (enemyMovement != null)
        {
            enemyMovement.enabled = false;
            enemyMovement2.enabled = false;
        }


        ragdoll.ActivateRagdoll();
        Invoke("Delay", 5f);
    }

    private void Delay()
    {
        Destroy(gameObject);
    }
}
2

After the player is nearby, you also need to raycast to him. And if the ray did not collide with the player, then there is a wall between you.

2 Likes