Instantiate prefab OnTriggerEnter

Question

I would like to Instantiate a rock prefab to fall from the sky when you enter a trigger, then be destroyed after a few seconds.

I am having trouble getting it to work though. I have made a prefab rock with rigid body. I have made a collider marked as trigger and added this java script.

 var rock : GameObject;
 
     function OnTriggerEnter (other : Collider) 
     {
         var clone : GameObject = Instantiate (rock, transform.position, transform.rotation);
                 Destroy(gameObject);
     }

Answer 1

Answer by kobal · Jan 11, 2013 at 03:46 AM

Figured it out. I was dumb and had the script on both the Rock and the Trigger.

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Answer 2

Answer by DaveA · Jan 11, 2013 at 01:18 AM

What you have, assuming it's on the collider object, will destroy that collider when you enter it, just making sure you want to do that.

It will also put the rock in the same place that the collider object was. My guess is you want to put it a few unit above that? Like:

Instantiate (rock, transform.position+Vector3.up*3, transform.rotation);

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kobal · Jan 11, 2013 at 01:27 AM 0

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Hey Dave. Yes that is correct. I do not want the rock to fall every time you enter the collider, just once. You are also correct on having the rock spawn higher than the collider. Do you have any idea why this is not working? The error I get is "UnassignedReferenceException: the variable rock of 'fallingRock' has not been assigned." I did put the rock prefab on the script in the inspector.

kobal · Jan 11, 2013 at 01:36 AM 0

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BTW it almost works. I see the rock spawn and start to fall. Then I get the error.

DaveA · Jan 11, 2013 at 01:38 AM 0

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Is 'fallingRock' the name of the above script? I'd say you forgot to assign it in the Inspector. If you have more than one of these in the scene, be sure to do it for all of them.

kobal · Jan 11, 2013 at 01:50 AM 0

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Yes. fallingRock is the name of the script. I guess I am confused on how to assign it. I thought I did. I put the script on the game object that is the trigger. I then put the rock prefab on the script.

kobal · Jan 11, 2013 at 02:21 AM 0

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I figured out what is causing the error, but I dont know how to fix it. The rock spawns and falls as intended. When the falling rock hits the collider I am using as a trigger I get the error.

Instantiate prefab OnTriggerEnter

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