How do I make my enemy chase the player?

Unity Engine
1

Hello,

I’m a beginner and I would like some help with this subject. I’m making a top down shooter (using all the same scripts and animations from this playlist https://www.youtube.com/playlist?list=PLFt_AvWsXl0ct75VmGXskJnzrStEbPD6d) and right now I’ve already got a moving player and a non-moving enemy. How do I make the enemy chase the player? After this I want the player to do die instantly when the distance between the enemy and player is 0. Once again I’m a newbie so please go easy on me. Any help would be appreciated.

Enemy script so far:

using UnityEngine;
using System.Collections;

public class Enemy : Entity {
  
    public float expOnDeath;
    private Player player;
  
    void Start() {
        player = GameObject.FindGameObjectWithTag("Player").GetComponent<Player>();
    }
  
  
    public override void Die () {
        player.AddExperience(expOnDeath);
        base.Die ();
    }
}

Player script:

using UnityEngine;
using System.Collections;

public class Player : Entity {
  
    private int level;
    private float currentLevelExperience;
    private float experienceToLevel;
  
    void Start() {
        LevelUp ();
    }
  
  
    public void AddExperience(float exp) {
        currentLevelExperience += exp;
        if (currentLevelExperience >= experienceToLevel) {
            currentLevelExperience -= experienceToLevel;
            LevelUp();
        }
      
        Debug.Log("EXP: " + currentLevelExperience + "   Level: " + level);
    }
  
    private void LevelUp() {
        level++;
        experienceToLevel = level * 50 + Mathf.Pow(level * 2,2);
      
        AddExperience(0);
    }
}

Entity script:

using UnityEngine;
using System.Collections;

public class Entity : MonoBehaviour {
   
    public float health;
   
   
    public virtual void TakeDamage(float dmg) {
        health -= dmg;
       
        if (health <= 0) {
            Die();
        }
    }
   
    public virtual void Die() {
        Destroy(gameObject);
    }
}
2

I’m not sure how you’re moving your player/character (whether they’re rigidbodies, character controllers, etc), but to get the direction between the player and the enemy you can use:

Vector3 direction = (player.gameObject.transform.position - transform.position).normalized;

You can then rotate the enemy to face the player and move towards him using Quaternion.LookRotation.

3

Use NavMesh to make the enemies walk towards to player with pathfinding.

Here’s a script that will point you into the right direction:
(Put this script on the enemy)

using UnityEngine;
using System.Collections;

public class EnemyAI : MonoBehaviour {
    public Transform player;
    public NavMeshAgent agent;

    void Start () {
        if (player == null) {
            player = GameObject.FindGameObjectWithTag("Player").transform;
        }
        if (agent == null) {
            agent = GetComponent<NavMeshAgent>();
        }
    }

    void FixedUpdate () {
        agent.SetDestination(player.position);
   
        //Kills player when distance is below 1, you wanted it to be 0.
        //but that would man that the enemy is inside of the player, at the exact same position o_o
        if(Vector3.distance(transform.position, player.position < 1) {
            //player.GetComponent<Player>().Kill();
        }
    }
}
4

Thank you for your response. Though I’ve encountered another error. I’ve attached the enemy NavMeshAgent and the Player to the EnemyAI script but when I try to run it, it says: “SetDestination can only be called on an active agent that has been placed on a NavMesh.” (line 18). Any idea how to fix this? EDIT: Fixed.

Next question: I am able to shoot through my walls but I don’t want this. How do I stop this?
Also I get a parsing error at the last 3 accolades.

5

That was a mistake on my part, sorry for that.
line 22:

if(Vector3.distance(transform.position, player.position) < 1) {
6

hey man, I can make my enemy run and hide but not shoot.