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Question by Cheenodash · Feb 16, 2013 at 04:27 AM · javascriptcollisiongameobjectprefabdestroy

Destroying a prefab on collision with a cube?

Hey, I'm relatively new to Unity3D, and I have to make a game for a piece of course work. The game I am making is a 2D shooter, where the play controls an object that can be moved left and right at the top of the screen. The objective is to protect a cube in the bottom center of the screen, while enemies attack from the left and right. I want the enemies to be destroyed when the hit the cube, but I can't get it to work! here is the code I've been trying to use, which has worked in other parts of the game:

 function OnCollisionEnter(collision : Collision) {
     if(collision.gameObject.tag == "Player")
     Destroy(gameObject);  
     }

The enemies come from a prefab called SpawnPrefab, and the cube is called Monument. I have tagged both the cube and the prefab/target as player, but it doesn't work! Thanks in advance! :)

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avatar image robertbu · Feb 16, 2013 at 05:14 AM 0
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I don't see anything wrong here. Put a Debug.Log() statement inside the function to see if you are getting collisions at all. Something like:

 Debug.Log("Collision: "+collision.gameObject.name);

How are you moving the enemies? Are you using the Rigidbody or are you manipulating the transform.

avatar image Arithan · Feb 16, 2013 at 05:18 AM 0
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What object is the script attached to? Also, OnCollisionEnter only works if the collider is not a trigger. If it is a trigger, use OnTriggerEnter ins$$anonymous$$d:

http://docs.unity3d.com/Documentation/ScriptReference/Collider.OnTriggerEnter.html

avatar image Cheenodash · Feb 16, 2013 at 10:46 AM 0
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@robertbu I am manipulating the transform as far as I know. It's just weird, because the very same prefabs are destroyed when a bullet with the same code on them hits!

avatar image Cheenodash · Feb 16, 2013 at 10:50 AM 0
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I also ran the debug, and nothing happened when my enemies hit, but when my bullet hit the cube, it registered collision :/

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Answer by Vonni · Feb 16, 2013 at 11:13 AM

Rhey, I don't know how you set up your game, but if you just move something through something else, it might not trigger collision. Try putting on a rigidbody with isKinematic on to force collision tests.

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avatar image Cheenodash · Feb 16, 2013 at 11:29 AM 0
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I added rigidbodies to all of my prefabs, and it works now! Thank you to all who commented, got loads of work to do and not much time to do it!

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