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Question by wetbiscuits27 · Jul 18, 2018 at 12:32 PM · c#booleanif-statements

Why doesn't this if-statement work?

I'm creating a game where you click boxes and gain points by doing so. I want to create new boxes when the game starts and when the box gets destroyed. Instead, this script just creates new boxes every frame. I don't know why this doesn't work, maybe I'm doing it all wrong, I'm pretty new to Unity and c#.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class BoxScript : MonoBehaviour {
 
     private bool boxExists = false;
     private Vector3 startPos = new Vector3(-10, 0, 0);
     public GameObject box;
 
     private void Update() {
         if (!boxExists) {
             Instantiate(box, startPos, Quaternion.identity);
             Destroy(box);
             boxExists = true; }
         }
 }
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avatar image Hellium · Jul 18, 2018 at 01:45 PM 0
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What gameObject is box ? Is a gameObject holding the BoxScript? If so, it's probably because the newly instantiated box run once the Update function, and thus, creates a new box before it's itself destroyed.

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Answer by Sgt_Spike · Jul 18, 2018 at 12:59 PM

Hi there. Don't quote me on this but I'm pretty sure it's not working because you are using Update(). Update executes so quickly that your code won't even get to 'boxExists = true', so basically it always equals false and creates a new box using 'Instantiate'. Try changing your code to this:

      using System.Collections;
      using System.Collections.Generic;
      using UnityEngine;
      
      public class BoxScript : MonoBehaviour {
      
          private bool boxExists = false;
          private Vector3 startPos = new Vector3(-10, 0, 0);
          public GameObject box;
      
          private void Start()
          {
               InvokeRepeating("YourMethod", 0f, 0.05f);
          }
 
          private void YourMethod() {
              if (!boxExists) {
                  Instantiate(box, startPos, Quaternion.identity);
                  Destroy(box);
                  boxExists = true; }
              }
      }

'YourMethod' you can change to what you want, and '0.05f' is how long until 'YourMethod' will be executed again. Try that and let me know if it works. :D

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avatar image wetbiscuits27 · Jul 18, 2018 at 01:43 PM 0
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Thanks for replying @HyperGamer87 ! I will try the code and let you know if it worked.

avatar image wetbiscuits27 · Jul 18, 2018 at 06:11 PM 0
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@HyperGamer87 I have implemented your code to my game and now it works perfectly, thanks a lot!

avatar image Sgt_Spike wetbiscuits27 · Jul 18, 2018 at 08:45 PM 0
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No problem. Glad I could help!

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