Destroy Projectile on Impact?

Questions & Answers
1

I’m a noob making a disc golf game. I think I’d have trouble getting the discs to stick in the chains on impact, so I’d like to just destroy the discs on impact with the chains. The chains have a sphere collider and it’s marked as a trigger. I also have an explosion set to detect collision. The collision is working.

However, I’m having a hard time figuring out how to simply destroy the discs. All discs are tagged as “discs”. They’re defined in a different script. Here is my code:

var explosion : Transform;

function OnTriggerEnter(hit : Collider)

{
if(hit.gameObject.tag == “discs”)
{

Destroy gameObject.tag == "discs";
		
	var exp = Instantiate(explosion, gameObject.transform.position, Quaternion.identity);	
		
				
			
					StrokeCount.STROKES = 0;
					StrokeCount.BASKETHITS += 1;
}

}

Trust me, I understand that I’m noob. I appreciate any help that’s offered.

2

Hi there and welcome. The Unity Answers forum is more for focused Q&A on Unity as opposed to general discussion topic so you may want to look at the Unity Community forums for questions such as this. Looking at your code, I see that you have a line which reads:

Destroy gameObject.tag == "discs";

I am actually surprised this even compiles. The syntax for the Destroy command can be found here:

http://unity3d.com/support/documentation/ScriptReference/Object.Destroy.html

As you will see, it expects an Object as a parameter and this is commonly an instance of GameObject to be destroyed. In your code, you are passing in:

gameObject.tag == "discs"

Which is a “boolean” (a true/false value) and most certainly not an object. As such, your discs are not disappearing.

3

From what I understand this destroying projectiles on impact is very similar behaviour to shooting rockets that explode when colliding, right?

http://unity3d.com/support/resources/tutorials/fpstutorial.html

I don’t know why this tutorial is hided for people. It’s pretty old but when you’re searching for some ideas it will do…
And some colliding/destroying things you can also find in… Lerpz 3D platform tutorial:

I found also this:

http://unity3d.com/support/documentation/ScriptReference/Object.Instantiate.html

And I guess that will be the best resource for your problems. It’s overcommented so noone should have problems with understanding and implementing this in their projects.

4

If your original script was attached to the disc, it should be:

var explosion : Transform;

function OnTriggerEnter(hit : Collider){
  if (hit.tag == "chain") { // if hit a chain object...
    Destroy(gameObject); // destroy himself...
    // and instantiate the explosion in its place:
    var exp = Instantiate(explosion, transform.position, Quaternion.identity);  
    StrokeCount.STROKES = 0;
    StrokeCount.BASKETHITS += 1;
  }
}

Your second script will not work unless you uncheck Is Trigger in the chain collider: OnCollision events only occur when the rigidbody hits a regular collider - OnTrigger events are reported when the collider has Is Trigger checked.

Your disc script could be something like this:

var explosion : Transform;

function OnCollisionEnter(col : Collision){
  if (col.gameObject.tag == "chain") { // if hit a chain... 
    Destroy(gameObject); // destroy itself
    // instantiate the explosion at its own position:
    var exp = Instantiate(explosion, transform.position, Quaternion.identity);  
    StrokeCount.STROKES = 0;
    StrokeCount.BASKETHITS += 1;
  }
}