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Question by ratboy · Mar 31, 2012 at 01:23 AM · collisionrigidbodyoncollisionenter

OnCollisionEnter function problem. JS

Hi, Im have a game object with lots of children (as a 2d person with 'limbs' containing rigid bodies) and an object which hits it, but i need to detect when the collision occurs.

I am using the following script:

 #pragma strict


function Start (){

}

function Update (){ var other : Collision; OnCollisionEnter(other);

}

function OnCollisionEnter(other : Collision){ if (other.gameObject.name == "character"){ Debug.Log("Smash");

     }

}

The problem is that firstly, I get an error saying the if(other.gameObject.name == "character") line 'object reference not set to an instance of an object', and also the function doesn't work as the Debug.Log isn't activated when the objects collide. I have tried using tags and the name of the whole character with the children inside, but the problem persists, any ideas? cheers guys :)

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Answer by rutter · Mar 31, 2012 at 02:10 AM

This part seems like a very bad idea:

 function Update ()
 {
     var other : Collision; 
     OnCollisionEnter(other);
 }

Firstly, you should probably avoid calling collision functions from your own code -- how will you distinguish between those calls and actual collisions?

Secondly, you're passing in a null reference, which seems to be causing that error you're getting.

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Answer by ratboy · Mar 31, 2012 at 12:03 PM

Of course! Seems so obvious now, I think I saw that on someone else's script and copied it across... Thanks a lot I'll sort it in the morning and let you know if it works, thanks for the quick response.

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