3D platform tutorial - Destroying dead bots

Unity Learn
1

I just finished the 3D platformer tutorial and now I am trying some of the next steps. I am trying to remove the dead robot guard in the EnemyDamage.js.

I thought “Destroy(deadModel, 2)” would work nicely but I am getting this:
Can’t remove component.
Can’t remove Transform because BoxCollider, SphereCollider, AudioSource depends on it

I tried removing the rigidbody and then the model but that didn’t work either. How should I be removing this dead robot guard?

2

Hi, welcome to the forum!

The Destroy function is indeed what you need here, but it will destroy the specific object you pass to it. In this case, you are passing a transform, but you actually need to pass the GameObject it is attached to:-

Destroy(deadModel.gameObject, 2);
3

Thanks! That works perfectly.

I got another method to work as well. I was just coming to post it :slight_smile:

I made an “EnemyIsDead” script with the Destroy() in the Update and put the script on the CopperDead prefab.

4

Hi

I’m trying to do something similar so thought it best to post here. I too am trying to kill a randomly spawned prefab in the middle of a sequence:

var nooby : GameObject[]; 

function Start() { 
   Spawn(); 
} 

function Spawn() { 
   for (i=0;i<1;i++) { 
      yield WaitForSeconds(0.5); 
  
     Instantiate(noobys[Random.Range(1, nooby.Length)], transform.position, transform.rotation);
     Debug.Log("First nooby spawned");
   } 
   yield WaitForSeconds(5); 
   Destroy (GameObject());
   Debug.Log("First nooby is DESTROYED");
   

    for (i=0;i<4;i++) { 
      yield WaitForSeconds(10); 
      Debug.Log("Next round - 4 noobys");
    
      Instantiate(noobys[Random.Range(1, noobys.Length)], transform.position, transform.rotation);
   } 
}

The Debug shows that the Destroy function is working, however, the spawned prefab remains on screen. How do i kill it!!

Cheers

5

With the line:-

Destroy (GameObject());

…what you are actually doing is creating a new, empty GameObject and then immediately destroying it (which is why you don’t see anything). If you want to destroy the object to which the script is attached, you should use:-

Destroy(gameObject);

…which is subtly different.

6

sorry to revive an old thread…

but I am trying to do something similar but with a sound;

Can’t remove Transform because AudioSource depends on it

I also tried the audio.PlayOneShot(shotSound); but had no idea how to destroy it on the GetButtonUp. Is it better to make it a prefab like I did or make it an AudioClip instead of a prefab?

7

You are instantiating a new object but destroying the original prefab. You need to keep a reference to the instance and destroy that when you’ve done with it:-

var windSound : Transform;
var windInstance: GameObject;

function Update()
{
if( Input.GetButtonDown("w") )
{
windInstance = Instantiate(windSound, gameObject.transform.position, Quaternion.identity);
}

if( Input.GetButtonUp( "w") )
{
Destroy(windInstance);
}
}
8

ahhh, so close… thx.

I grew frustrated so eventually came up with;

var windSound : AudioClip;

function Update()
{
	if( Input.GetButtonDown("w") )
	{
		audio.clip = windSound;
		audio.Play();
	}
	
	if( Input.GetButtonUp( "w") )
	{
		audio.clip = windSound;
		audio.Pause();
	}

Is there any reason to use one or the other?

9

A bit late, but I might as well put info here for future capsulers(Yes im an Eve fan) :wink:

Here’s how I did it.

I just copied some of the code from the respawn script and made a new one called DestroyMe.js

just add the new script to your copperDead prefab, then link the copperDead prefab to your new script’s GameObject.

here’s the complete code:

/*
	DestroyMe.js
	This script checks if the player is out ofrange. If so, the enemyPrefab is automatically destroyed.
*/

var triggerRange = 0.0;	// the distance within which the enemyPrefab should be destroyed.
var enemyPrefab : GameObject;

// Cache variables, used to speed up the code.
private var player : Transform;

// Called on Scene startup. Cache a link to the Player object.
// (Uses the tagging system to locate him.)
function Start ()
{
	player = GameObject.FindWithTag("Player").transform;
}

// Called at least once every game cycle. This is where the fun stuff happens.
function Update ()
{
	// how far away is the player?
	var distanceToPlayer = Vector3.Distance(transform.position, player.position);
	
	// is he out of range?
	if (distanceToPlayer > triggerRange)
		Destroy(enemyPrefab);	// kill the prefab...
}

@script AddComponentMenu("Third Person Enemies/DestroyMe")

Im not an programmer so i dont know if this is the right way to do it, but it works.

note: don’t forget to set an initial value to triggerRange.