How do i get the source collider on an OnTriggerEnter?

Questions & Answers
1

I have two gameObjects, both with several colliders attached.

On the OnTriggerEnter event, i get the "otherCollider" info, so that i know which of the "target" colliders that have collided.

But how do i get information on which of the "source" colliders that is causing the collision? In other words, is there any way to get a "thisCollider"?

3

If you have a single collider in your "source" object, then just fetching it with the collider property will do it.

If you have several colliders in your "source" object, I think you can get the colliders through the Collision structure, in the contactPoints.

4

I do have a solution my self that might work, but I'm not sure if it will make problems in the long run or affect the performace too much.

My solution is to add a rigidbody to all the child objects with a collider atteched to it, and then add the OnTriggerEnter script to every one of these objects.

This way, I can do like this:

void OnTriggerEnter(Collider otherCollider)
{

    print("This collider: " + name);
    print("Other collider: " + otherCollider.name);

}

But as mentioned, I'm bit worried that attaching several child objects with their own rigidbody, will affect performance. Or even worse, result in unexpected behaviour.

6

May work for your collider if you do not have rigidbody. Dosnt if you have.

2

That would be the collider that is attached to the same gameObejct as your script :o) , so just access it as "collider":

print("Object "+collider.name+" has hit object "+other.name);
5

void OnTriggerEnter(Collider other)
{

if(other.CompareTag(“YourCollider”))
{

//do somthing;

}

}