2D AI Multiple Targets

Unity Engine
1

Hi, I’m making a 2D, top-down, game. I’m trying to program an AI ally to help fight enemy’s.

the way it should work is, when multiple enemy’s are in range. it will chase the nearest enemy, unfortunately, the way it actually works is, if multiple enemy’s are within range, it will chase whichever enemy is first in the Hierarchy. I could really use some help.

Here’s my code, thanks in advance!

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

public class AllyMove : MonoBehaviour {



    public float StartSpeed;

    private float speed;

    public string TargetsTag;

    public string SecondaryTarget;


    private Transform target;
    private Transform target2;


    public float chaseRange;

    public float stopRange;

    public float PlayerStopRange;

    private bool FacingLeft = true;


    void flip()
    {
        FacingLeft = !FacingLeft;
        Vector3 Scaler = transform.localScale;
        Scaler.x *= -1;
        transform.localScale = Scaler;
    }


    // Use this for initialization
    void Start()
    {
        speed = StartSpeed;

        target = GameObject.FindGameObjectWithTag(TargetsTag).GetComponent<Transform>();

        target2 = GameObject.FindGameObjectWithTag(SecondaryTarget).GetComponent<Transform>();

    }

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



        if (Vector2.Distance(transform.position, target.position) > stopRange && Vector2.Distance(transform.position, target.position) < chaseRange)
        {
            transform.position = Vector2.MoveTowards(transform.position, target.position, speed * Time.deltaTime);

            if (target.position.x > transform.position.x && FacingLeft == true)
                flip();
            else if (target.position.x < transform.position.x && FacingLeft == false)
                flip();

        }
        if (Vector2.Distance(transform.position, target.position) > chaseRange && Vector2.Distance(transform.position, target2.position) > PlayerStopRange)
        {
            transform.position = Vector2.MoveTowards(transform.position, target2.position, speed * Time.deltaTime);
            if (target2.position.x > transform.position.x && FacingLeft == true)
                flip();
            else if (target2.position.x < transform.position.x && FacingLeft == false)
                flip();


        }
    }
}
2

try:

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

public class AllyMove : MonoBehaviour {



    public float StartSpeed;

    private float speed;

    public string TargetsTag;

    public string SecondaryTarget;


    private Transform target;
    private Transform target2;


    public float chaseRange;

    public float stopRange;

    public float PlayerStopRange;

    private bool FacingLeft = true;


    void flip()
    {
        FacingLeft = !FacingLeft;
        Vector3 Scaler = transform.localScale;
        Scaler.x *= -1;
        transform.localScale = Scaler;
    }


    // Use this for initialization
    void Start()
    {
        speed = StartSpeed;

        target = GameObject.FindGameObjectWithTag(TargetsTag).GetComponent<Transform>();

        target2 = GameObject.FindGameObjectWithTag(SecondaryTarget).GetComponent<Transform>();

    }

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



        if (Vector2.Distance(transform.position, target.position) > stopRange && Vector2.Distance(transform.position, target.position) < chaseRange && Vector2.Distance(transform.position, target2.position) > Vector2.Distance(transform.position, target.position))
        {
            transform.position = Vector2.MoveTowards(transform.position, target.position, speed * Time.deltaTime);

            if (target.position.x > transform.position.x && FacingLeft == true)
                flip();
            else if (target.position.x < transform.position.x && FacingLeft == false)
                flip();

        }
        if (Vector2.Distance(transform.position, target.position) > chaseRange && Vector2.Distance(transform.position, target2.position) > PlayerStopRange)
        {
            transform.position = Vector2.MoveTowards(transform.position, target2.position, speed * Time.deltaTime);
            if (target2.position.x > transform.position.x && FacingLeft == true)
                flip();
            else if (target2.position.x < transform.position.x && FacingLeft == false)
                flip();


        }
    }
}
3

sorry, I think i might’ve not put in enough detail.

the “target” is something with the “enemy” tag, and “target2” is something with the “Player” tag.

also, i moved the code that assigned the targets to the update function.

4

This didnt work because i didnt give you the proper information, but i managed to get it working after a while.

Thanks Anyway!