When I merge 2 objects it spawns 2 objects

Questions & Answers
1

I just started to make a merge game. I try to merge 2 objects but because the script is in both of the objects it repeats the script 2 time and it spawn 2 objects instead of 1. Here is the code.

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

public class merge : MonoBehaviour
{
    public GameObject box2Prefab;
    private void OnTriggerEnter2D(Collider2D other)
    {
        if (other.transform.tag == "box1")
        {
            GameObject box2z = Instantiate(box2Prefab);
            box2z.transform.parent = transform.parent; 
            box2z.transform.position = this.transform.position;
            Destroy(other.gameObject);
            Destroy(gameObject);
        }
    }
}

I cant delete the script on the other object because if I put a spawner it won’t work.

2

You could try DestroyImmediate instead of Destroy, which might get rid of the other object fast enough for it not to spawn its own copy of the new object. If that doesn’t work just set a flag in the script to signify if the new box has been spawned already or not. Something like

bool newBoxAlreadySpawned = false;

OnTriggerEnter()
if(newBoxAlreadySpawned) return;
else
    other.GetComponent<Merge>().newBoxAlreadySpawned = true;
    //the rest of your stuff