How do keep the value of the Transform variable in script which is instantiated with a Game Object?

Questions & Answers
1

I am making a Player Detection System in c#. When the scene starts the game will instantiate the entity at a random point on the map. The problem is that for the Player Detection System to work, it needs to know the player’s Transform coordinates to detect how far away the player is. The Transform is stored in a variable that looks like this:
public Transform player;
The issue is every time I instantiate the entity (The entity with the script on it), it resets the value that I set the variable to, in this case, the Player.

The rest of the script looks like this:

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

public class CotruxMovement : MonoBehaviour {

	// Animation Control Variable 
	public Animator walk;
	
	// Wandering Control Variables
	public float moveSpeed = 3f;
    public float rotSpeed = 100f;
	public float chargeSpeed = 12f;
    private bool isWandering = false;
    private bool isRotatingLeft = false;
    private bool isRotatingRight = false;
    private bool isWalking = false;
	
	// Attacking Control Variables
	public Transform player;
	public float attackBack;
	public bool hostile = false;
	private bool attacking = false;
	
	// Knockback Variable
	Rigidbody rigid;
	
	void Start () {
		
		rigid = GetComponent<Rigidbody>();
		
		walk = GetComponent<Animator>();
	}
	
	void Update () {
		// Wandering Controls Part 1
		// ---
			if (isWandering == false & !attacking)
			{
			
				StartCoroutine(Wander());
			}
			if(isRotatingRight == true & !attacking)
			{
				// Rotoate Right
				transform.Rotate(transform.up * Time.deltaTime * rotSpeed);
				walk.Play("CotruxIdle");
			}
			if (isRotatingLeft == true & !attacking)
			{
				// Rotate Left
				transform.Rotate(-transform.up * Time.deltaTime * -rotSpeed);
				walk.Play("CotruxIdle");
			}	
			if(isWalking == true & !attacking)
			{
				// Moving Fowards
				transform.position += transform.forward * moveSpeed * Time.deltaTime;
			
			
				walk.Play("CotruxWalk");
			}
		// ---
	
		// Player Detection & Attack Rotation
		// ---
		if (hostile == true)
		{
			if(Vector3.Distance(player.position, this.transform.position) < 33)
			{
			
				attacking = true;
				Vector3 direction = player.position - this.transform.position;
				direction.y = 0;
				this.transform.rotation = Quaternion.Slerp(this.transform.rotation,
										Quaternion.LookRotation(direction), 0.5f);
			
			
			
			
			
				transform.position += transform.forward * chargeSpeed * Time.deltaTime;
				walk.Play("CotruxCharge");
			} else {
				attacking = false;
			}
			
		}
		
	
	}
	
	// Wander Timing
	IEnumerator Wander()
    {
        int rotTime = Random.Range(1, 3);
        int rotateWait = Random.Range(1, 3);
        int rotateLorR = Random.Range(0, 3);
        int walkWait = Random.Range(1, 3);
        int walkTime = Random.Range(1, 5);

        isWandering = true;


        yield return new WaitForSeconds(walkWait);
        isWalking = true;
        yield return new WaitForSeconds(walkTime);
		walk.Play("CotruxIdle");
        isWalking = false;
        yield return new WaitForSeconds(rotateWait);
        if(rotateLorR == 1)
        {
            isRotatingRight = true;
            yield return new WaitForSeconds(rotTime);
            isRotatingRight = false;
        }
        if (rotateLorR == 2)
        {
            isRotatingLeft = true;
            yield return new WaitForSeconds(rotTime);
            isRotatingLeft = false;
        }
        isWandering = false;
    }
	
	// Player Collision Detection
	void OnCollisionEnter(Collision col)
	{
		if(col.gameObject.tag == "Player")
		{
			rigid.AddRelativeForce(-Vector3.forward * attackBack);
		}
	}
	
}

I also tried to set the variable to the Player by looking for the player’s tag:

balls = GameObject.FindGameObjectsWithTag ("Ball").transform;

But this did not work.

2

Next time, I would really advise you to post a piece of code that contains the bare minimum to illustrate the problem and show what you’ve tried. You’ll greatly increase your chances of getting help.

Also, you haven’t shown us the code that does the instantiation (unless I just missed it). If the instantiation occurs inside the script that has the “Transform player” property then simply do this:

var playerObject = instantiate (...);
player = playerObject.transform;

You seem to be using the wrong Find method. The one you used returns an array and then you tried to access “transform” inside the array which doesn’t make sense.

Do it like this:

var ballGameObject = GameObject.FindWithTag ("Ball");
if (ballGameObject != null)
{
	player = ballGameObject.transform;
}
else
{
	Debug.Log ("Failed to find Ball object");
}