How do I make my enemy chase the player?

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:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Enemy : Entity {
5.  
6.     public float expOnDeath;
7.     private Player player;
8.  
9.     void Start() {
10.         player = GameObject.FindGameObjectWithTag("Player").GetComponent<Player>();
11.     }
12.  
13.  
14.     public override void Die () {
15.         player.AddExperience(expOnDeath);
16.         base.Die ();
17.     }
18. }
19.  

Player script:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Player : Entity {
5.  
6.     private int level;
7.     private float currentLevelExperience;
8.     private float experienceToLevel;
9.  
10.     void Start() {
11.         LevelUp ();
12.     }
13.  
14.  
15.     public void AddExperience(float exp) {
16.         currentLevelExperience += exp;
17.         if (currentLevelExperience >= experienceToLevel) {
18.             currentLevelExperience -= experienceToLevel;
19.             LevelUp();
20.         }
21.      
22.         Debug.Log("EXP: " + currentLevelExperience + "   Level: " + level);
23.     }
24.  
25.     private void LevelUp() {
26.         level++;
27.         experienceToLevel = level * 50 + Mathf.Pow(level * 2,2);
28.      
29.         AddExperience(0);
30.     }
31. }
32.  

Entity script:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Entity : MonoBehaviour {
5.    
6.     public float health;
7.    
8.    
9.     public virtual void TakeDamage(float dmg) {
10.         health -= dmg;
11.        
12.         if (health <= 0) {
13.             Die();
14.         }
15.     }
16.    
17.     public virtual void Die() {
18.         Destroy(gameObject);
19.     }
20. }
21.  

 

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:

Code (csharp):

1. 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.

 

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)

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class EnemyAI : MonoBehaviour {
5.     public Transform player;
6.     public NavMeshAgent agent;
7.  
8.     void Start () {
9.         if (player == null) {
10.             player = GameObject.FindGameObjectWithTag("Player").transform;
11.         }
12.         if (agent == null) {
13.             agent = GetComponent<NavMeshAgent>();
14.         }
15.     }
16.  
17.     void FixedUpdate () {
18.         agent.SetDestination(player.position);
19.    
20.         //Kills player when distance is below 1, you wanted it to be 0.
21.         //but that would man that the enemy is inside of the player, at the exact same position o_o
22.         if(Vector3.distance(transform.position, player.position < 1) {
23.             //player.GetComponent<Player>().Kill();
24.         }
25.     }
26. }

 

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.

 

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

Code (CSharp):

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

 

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