2D top down Enemy AI Needed

Unity Engine
1

so i found this enemy ai code. but when i use it, it seems to confliuct with my player movement code, and they move at the same time but slightly out of sync

Enemy AI code:

using UnityEngine;
using System.Collections;

public class EnemyAI : MonoBehaviour {
    public Transform target;
    public int moveSpeed;
    public int rotationSpeed;
    public int maxdistance;
   
    private Transform myTransform;
   
    void Awake(){
        myTransform = transform;
    }


    void Start () {
        GameObject go = GameObject.FindGameObjectWithTag("Player");
       
        target = go.transform;
   
        maxdistance = 2;
    }
   

    void Update () {
        Debug.DrawLine(target.position, myTransform.position, Color.red);
       

        myTransform****tation = Quaternion.Slerp(myTransform****tation, Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed * Time.deltaTime);
       
        if(Vector3.Distance(target.position, myTransform.position) > maxdistance){
        //Move towards target
        myTransform.position += myTransform.forward * moveSpeed * Time.deltaTime;
   
        }
    }
       
}

and this is my player code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerController : MonoBehaviour {

   
    public float moveSpeed;

    private Animator anim;
    private Rigidbody2D myRigidbody;

    private bool playerMoving;
    private Vector2 lastMove;

    // Use this for initialization
    void Start () {

        anim = GetComponent<Animator>();
        myRigidbody = GetComponent<Rigidbody2D>();

    }

    // Update is called once per frame
    void Update() {

        playerMoving = false;

        if (Input.GetAxisRaw("Horizontal") > 0.5f || Input.GetAxisRaw("Horizontal") < -0.5f)
        {

            transform.Translate(new Vector3(Input.GetAxisRaw("Horizontal") * moveSpeed * Time.deltaTime, 0f, 0f));
            myRigidbody.velocity = new Vector2(Input.GetAxisRaw("Horizontal"), myRigidbody.velocity.y);
            playerMoving = true;
            lastMove = new Vector2(Input.GetAxisRaw("Horizontal"), 0f);
        }


        if (Input.GetAxisRaw("Vertical") > 0.5f || Input.GetAxisRaw("Vertical") < -0.5f)
        {
             transform.Translate(new Vector3(0f, Input.GetAxisRaw("Vertical") * moveSpeed * Time.deltaTime, 0f));
            myRigidbody.velocity = new Vector2(myRigidbody.velocity.x, Input.GetAxisRaw("Vertical") * moveSpeed);
            playerMoving = true;
            lastMove = new Vector2(0f, Input.GetAxisRaw("Vertical"));
        }

        if(Input.GetAxisRaw("Horizontal") < 0.5f && Input.GetAxisRaw("Horizontal") > -0.5f)
        {
            myRigidbody.velocity = new Vector2(0f, myRigidbody.velocity.y);
        }

        if (Input.GetAxisRaw("Vertical") < 0.5f && Input.GetAxisRaw("Vertical") > -0.5f)
        {
            myRigidbody.velocity = new Vector2(myRigidbody.velocity.x, 0f);
        }



            anim.SetFloat("MoveX", Input.GetAxisRaw("Horizontal"));
        anim.SetFloat("MoveY", Input.GetAxisRaw("Vertical"));
        anim.SetBool("PlayerMoving", playerMoving);
        anim.SetFloat("LastMoveX", lastMove.x);
        anim.SetFloat("LastMoveY", lastMove.y);
    }
}
2

Hello Mongpong!

Could you be more specific about what is wrong and what is the result you expect from the AI?

3

basic random motion, and for the ai to attack the player within a radius

my ai doesnt seem to be doing much at all apart from being controlled the same as the player

4

Ok, so from what I can see in the AI script, what makes it move is this part:

if(Vector3.Distance(target.position, myTransform.position) > maxdistance)
{
        //Move towards target
        myTransform.position += myTransform.forward * moveSpeed * Time.deltaTime;
}

Now, if you want your AI to move towards the player (and attack him) only when the player is within the radius of the AI, you could attach to the AI a Sphere Collider, and make the AI move towards the player only when he collides with that Sphere Collider (using the method OnTriggerStay and OnTriggerExit for example).

bool isInRadius = false;

void Update ()
{
    if(Vector3.Distance(target.position, myTransform.position) > maxdistance && isInRadius == true)
        {
            //Move towards target
            myTransform.position += myTransform.forward * moveSpeed * Time.deltaTime;
        }
}

void OnTriggerStay (Collider ai) //isInRadius will stay true as long as the Player is within the radius
{
    If (ai.CompareTag("Player"))
        isInRadius = !isInRadius;
}

void OnTriggerExit (Collider ai) //isInRadius will become false when the Player exit the radius of the AI
{
    if (ai.CompareTag("Player"))
        isInRadius = !isInRadius;
}

Also, don’t forget to tag your Player game object as “Player”.

As for random motion, there’s a “Wander” script on the Unity wiki, that you can find right here.

1 Like