How do i make my enemy AI attack?

Questions & Answers
1

So i’m really new and i want that my Enemy would attack me and do a certain amount of damage (would be nice if there was a range and delay)

Here’s my Enemy script:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;

public class EnemyAII : MonoBehaviour {

Transform playerTransform;
UnityEngine.AI.NavMeshAgent myNavmesh;
public float checkRate = 0.01f;
float nextCheck;

// Start is called before the first frame update
void Start() {

    if (GameObject.FindGameObjectWithTag("Player").activeInHierarchy)
        playerTransform = GameObject.FindGameObjectWithTag("Player").transform;

    myNavmesh = gameObject.GetComponent<UnityEngine.AI.NavMeshAgent>();       
    }

// Update is called once per frame
void Update()
{
    if (Time.time > nextCheck)
    {
        nextCheck = Time.time + checkRate;
        FollowPlayer();
    }
}

void FollowPlayer()
{
    myNavmesh.transform.LookAt(playerTransform);
    myNavmesh.destination = playerTransform.position;
}

}

And here’s my playerHealth script:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

public class PlayerHealth : MonoBehaviour
{
public int maxHealth = 100;
public int currentHealth;

public HealthBar healthBar;

// Start is called before the first frame update
void Start()
{
	currentHealth = maxHealth;
	healthBar.SetMaxHealth(maxHealth);
}

// Update is called once per frame
void Update()
{
    if // I don't know what to do here
	{
		TakeDamage(20);
	}
	if (currentHealth <= 0)
	{
		Die();
	}
}	

void Die()
{
    SceneManager.LoadScene(SceneManager.GetActiveScene().name);
}

void TakeDamage(int damage)
{
	currentHealth -= damage;

	healthBar.SetHealth(currentHealth);
}

}

So basicly i want the enemy do damage until my health bar is at 0.

2

My answer is completely untested, and might not be very good, but I think I have a solution
To cause damage to the player, maybe you could use void OnTriggerEnter(Collider other){}to detect when the enemy makes contact with the player. Then you would need to add a trigger collider around the enemy for the enemy’s attack range, so that the player will take damage when in that range. The script could be something like this:

public class EnemyAttack : MonoBehaviour
{

    public float enemyCooldown = 1;
    public float damage = 1;

    private bool playerInRange = false;
    private bool canAttack = true;

    private void Update()
    {
        if (playerInRange && canAttack)
        {
            GameObject.Find("Player").GetComponent<ControllerForPlayer>().currentHealth -= damage;
            StartCoroutine(AttackCooldown());
        }
    }

    void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.CompareTag("Player"));
         {
            playerInRange = true;
        }
    }
    void OnTriggerExit(Collider other)
    {
        if (other.gameObject.CompareTag("Player"));
         {
            playerInRange = false;
        }
    }
    IEnumerator AttackCooldown()
    {
        canAttack = false;
        yield return new WaitForSeconds(enemyCooldown);
        canAttack = true;
    }
}

Make sure to make the currentHealth variable in the player script public and everything else should work. IMPORTANT: DO NOT forget to add a trigger collider to the enemy to specify it’s attack radius.

I really hope this works for you. Please let me know if it does! This was a really fun thing to try and figure out, so thanks for that.

EDIT: I’ve revised this code a couple of times now, and I can verify that it does indeed work for me, so hopefully it will work for you too.