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Question by brusrecenthusky · Mar 26, 2021 at 06:18 PM · c#variable

How to get updated variable from another script?

I can't seem to get the updated variable "isInPosition" from another script to work on a different script.

ScriptA

 using UnityEngine;
 
 public class EnemyMovement : MonoBehaviour
 {
     public InputManager input;
 
     float speed = 2f;
 
     Vector2 target;
     Vector2 position;
 
     // Start is called before the first frame update
     void Start()
     {
         target = new Vector2(1.66f, -1.762784f);
     }
 
     // Update is called once per frame
     void Update()
     {
         position = gameObject.transform.position;
         float step = speed * Time.deltaTime;
 
         transform.position = Vector2.MoveTowards(transform.position, target, step);
     }
 
     public bool isInPosition()
     {
         if (position == target)
         {
             return true;
         }
         return false;
     }
 }
 


Script B

 using UnityEngine;
 
 public class InputManager : MonoBehaviour
 {
     public EnemySpawnScript enemySpawn;
     public EnemyMovement enemyMove;
 
     void Update()
     {
         
         for (int i = 0; i < Input.touchCount; i++)
         {
             if (Input.GetTouch(i).phase == TouchPhase.Began)
             {
                 Debug.Log("Working");
             } 
         }
 
         if (Input.GetKeyDown(KeyCode.Space) && enemyMove.isInPosition())
         {
             enemySpawn.EnemyKilled();
         }
         else if (Input.GetKeyDown(KeyCode.Space) && !enemyMove.isInPosition())
         {
             Debug.Log("You lose");
         }
     }
 }
 

If I use a debug.log in the first script, it works as it should. But if I use a debug.log on the second script calling the same variable inside the update method, it's always true even though on the first script, it is false first and then true.

I would like to understand why this Isn't working and if there is a way I can make this work without using methods. Thank you.

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avatar image dylan1812 · Mar 26, 2021 at 06:27 PM 0
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since isInPosition is a method and not a variable you should include the brackets after the call. enemyMove.isInPosition should be enemyMove.isInPosition()

avatar image brusrecenthusky dylan1812 · Mar 26, 2021 at 06:41 PM 0
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Oops, sorry. That was a typo. I have already tried using a simple public global variable as well and that did not work too.

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Answer by SharonReytan · Mar 26, 2021 at 07:18 PM

Try adding some tolerance to isInPosition MoveTowards will take you closer to the point but not exactly to it

Something like

private const float Tolerance = 0.0001f;

public bool isInPosition() { if (Vector3.Distance(position, target) <= Tolerance) { return true; } return false; }

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avatar image KoenigX3 · Mar 26, 2021 at 08:49 PM 1
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The official documentation states that Vector2.operator == returns true only if the magnitude of their difference is less than 1e-5.

avatar image SharonReytan · Mar 26, 2021 at 08:53 PM 0
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Good to know! But still, this is a very small number, and probably the author wants something less precise that will just work when the gameobject is close enough to the point. I use this tolerance pattern all the time when moving and lerping

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