when I was watching on YouTube, tutorials about endless runner on part 2, the game object wouldn't disappear when it hits the player

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

public class Obstacle : MonoBehaviour
{
    public int damage = 1;
    public float speed;

    private void Update()
    {
        transform.Translate(Vector2.left * speed * Time.deltaTime);
    }

    void onTriggerEnter2D(Collider2D other)
    {
        if (other.CompareTag("rocket"))
        {
            //rocket takes damage 1
            other.GetComponent<rocket>().health -= damage;
            Debug.Log(other.GetComponent<rocket>().health);
            Destroy(gameObject);
        }
    }
} 

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

public class rocket : MonoBehaviour
{
    private Vector2 targetPos;
    public float Yincrement;

    public float speed;
    public float maxHeight;
    public float minHeight;

    public int health = 3;

    void Update()
    {
        if (health <= 0)
        {
            SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
        }

        transform.position = Vector2.MoveTowards(transform.position, targetPos, speed * Time.deltaTime);

        if (Input.GetKeyDown(KeyCode.UpArrow) && transform.position.y < maxHeight)
        {
            targetPos = new Vector2(transform.position.x, transform.position.y   Yincrement);
        }
        else if (Input.GetKeyDown(KeyCode.DownArrow) && transform.position.y > minHeight)
        {
            targetPos = new Vector2(transform.position.x, transform.position.y - Yincrement);
        }
    }
}

from this one https://www.youtube.com/watch?v=FVCW5189evI and I'm confused why it didn't work, can someone tell me what is wrong?

CodePudding user response：

if you want to destroy use this, Correct Method to get the game object when collide is: other.gameObject

void onTriggerEnter2D(Collider2D other)
 {
 if (other.CompareTag("rocket"))
  {
    //rocket takes damage 1
    other.gameObject.GetComponent<rocket>().health -= damage;
    Debug.Log(other.gameObject.GetComponent<rocket>().health);
    Destory(other.gameObject);
  }
}

CodePudding user response：

Use SetActive instead of Destroy Function.

void onTriggerEnter2D(Collider2D other)
{
    if (other.CompareTag("rocket"))
    {
        //rocket takes damage 1
       
          other.gameObject.GetComponent<rocket>().health -= damage;
     
        Debug.Log(other.gameObject.GetComponent<rocket>().health);

      gameObject.SetActive(false);// it'll Hide GameObject instead of Destroying
       // gameObject.SetActive(true);// to show again
    }
}