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Question by Leroterr · May 15, 2014 at 11:18 AM · c#collisioninstantiatecolliderdestroy

Instantiate 1 object after 2 objects collide. ( C# )

How can I make it so that when 2 objects collide, they will be destroyed and instantiate only 1 object at their contact point?

These 2 objects are also clones of each other.

Here is my current code: When they collide, they will instantiate an object. This code instantiates an object per object though so they instantiate a total of 2 objects instead of 1.

 public Vector3 rocket;
 
 void OnCollisionEnter2D(Collision2D col)
     {
     if (col.gameObject.CompareTag ("rocketTag"))
         {
             //Assigns the 'Vector3 'rocket'' to the position of the collision.
             ContactPoint2D contactPositioned = col.contacts[0];
             Vector3 contactPosition = contactPositioned.point;
             rocket = new Vector3(contactPosition.x, contactPosition.y);
 
             //This instantiates the Explosion object on the rocket's position / Vector3.
             Instantiate(Resources.Load("Explosion"), rocket, Quaternion.identity);
             
             //Destroys the rocket.
             Destroy (gameObject);
 
             //When 2 rockets collide, they instantiate a total of 2 explosions, but I only need 1 explosion.
         }
     }

Thanks! I saw someone asking about the same question here though, but it was in Javascript, and when I tried to convert it to C#, it didn't work. I also couldn't ask them there because it was locked and it was also from 2 years ago, so I just decided to make another one.

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Answer by torrente · May 15, 2014 at 12:11 PM

How about comparing the ID? Something like:

 if (GetInstanceID() < col.gameObject.GetInstanceID())
 {
 //Instantiate code here
 }

Could go either way as far as the greater than, less than part.

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avatar image Leroterr · May 15, 2014 at 12:23 PM 0
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Thanks! It worked. If you have the time, what did GetInstanceID do actually? Like, why did you have to compare them with > or <. I'm new to Unity and it's the first time I saw that code. The documentation about it from the Unity Script Reference didn't seem to help. Thanks again :)

avatar image torrente · May 15, 2014 at 12:27 PM 1
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Every game object you make will have a unique instance ID. you can use that code to look up the object (instance) ID. It returns an INT value that is compared to the other INT.

avatar image Leroterr · May 15, 2014 at 12:29 PM 0
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Oh okay, thanks! :)

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