5 seconds after i hit play a projectile that hasnt been triggered launches and removes the tilemap, HELP

Questions & Answers
1

Hi, Extremely new to unity and c#

I’m following the Ruby’s Adventure 2D tutorial and have just wrote the script for launching a projectile when triggered ( by pressing “c” on a keyboard" , that works fine apart from the fact that 5 seconds after i press play in the editor a projectile that hasn’t been launched goes on to hit a robot and for some unknown reason completely removes the tilemap in game.

The projectile is linked to the character “ruby” as she launches it here’s the scripts i’ve used.

Projectile

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

public class Projectile : MonoBehaviour
{

Rigidbody2D rigidbody2d;

void Awake()
{
    rigidbody2d = GetComponent<Rigidbody2D>();

}

// Update is called once per frame
void Update()
{
    
}

public void Launch(Vector2 direction, float force)
{
    rigidbody2d.AddForce(direction * force);
}

void OnCollisionEnter2D(Collision2D other)
{
    //we also add a debug log to know what the projectile touch
    Debug.Log("Projectile Collision with " + other.gameObject);
    Destroy(gameObject);
}

}

RubyController

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

public class RubyController : MonoBehaviour
{
public float speed = 3.0f;

public int maxHealth = 5;

public float timeInvincible = 2.0f;


public GameObject projectilePrefab;

int currentHealth;
bool isInvincible;
float invincibleTimer;

public int health { get { return currentHealth; } }



Rigidbody2D rigidbody2d;

Animator animator;
Vector2 lookDirection = new Vector2(1, 0);



// Start is called before the first frame update
void Start()
{
    rigidbody2d = GetComponent<Rigidbody2D>();

    currentHealth = maxHealth;

    animator = GetComponent<Animator>();

}

// Update is called once per frame
void Update()
{
    if (Input.GetKeyDown(KeyCode.C))
    {
        Launch();
    }

    float horizontal = Input.GetAxis("Horizontal");
    float vertical = Input.GetAxis("Vertical");

    Vector2 move = new Vector2(horizontal, vertical);

    if (!Mathf.Approximately(move.x, 0.0f) || !Mathf.Approximately(move.y, 0.0f))
    {
        lookDirection.Set(move.x, move.y);
        lookDirection.Normalize();
    }

    animator.SetFloat("Move X", lookDirection.x);
    animator.SetFloat("Move Y", lookDirection.y);
    animator.SetFloat("Speed", move.magnitude);

    Vector2 position = rigidbody2d.position;

    position = position + move * speed * Time.deltaTime;

    rigidbody2d.MovePosition(position);

    if (isInvincible)
    {
        invincibleTimer -= Time.deltaTime;
        if (invincibleTimer < 0)
            isInvincible = false;
    }

    
}

public void ChangeHealth(int amount)
{
    if (amount < 0)
    {
        if (isInvincible)
            return;

        isInvincible = true;
        invincibleTimer = timeInvincible;

        animator.SetTrigger("Hit");
    }

    currentHealth = Mathf.Clamp(currentHealth + amount, 0, maxHealth);

    Debug.Log(currentHealth + "/" + maxHealth);
}

void Launch()
{
    GameObject projectileObject = Instantiate(projectilePrefab, rigidbody2d.position + Vector2.up * 0.5f, Quaternion.identity);

    Projectile projectile = projectileObject.GetComponent<Projectile>();
    projectile.Launch(lookDirection, 300);

    animator.SetTrigger("Launch");
}

}

Hopefully someone can help me out as the tutorial is kinda buggy and some stuff doesnt actually work as it should :frowning:

2

Did you delete the original projectile prefab so there are none at the start of your scene?
What do you mean by “tilemap”, what is that?

3

You haven’t, accidentally, put the Projectile script onto the Tilemap (or somewhere else it isn’t supposed to be)?

Throwing some logic at it:

  • You did not launch a Projectile gameobject, so it is not likely to actually be one of those.
  • The Projectile script destroys the gameobject it is attached to - which appears to be the tilemap (or an ancestor).
  • Collissions work both ways - so it could be that the robot is what is moving.

Try to add the name of the gameobject the Projectile script is added to in the Debug.Log() output and change the code to:

void OnCollisionEnter2D(Collision2D other)
{
    //we also add a debug log to know what the projectile touch
    Debug.Log(this.gameObject + " collided with " + other.gameObject);

    Selection.SetActiveObjectWithContext(this.gameObject, this);
    EditorApplication.ExecuteMenuItem("Edit/Frame Selected");
    EditorApplication.isPaused = true;
    // Destroy(gameObject);
 }

So that you can have a look at it happening in the editor.