1

Okay, so i have these robots, big robots, that i want to kill people when it gets near them, so i have a sphere that follows their feet. and it is scripted with the following instadeathcollider:

function OnTriggerEnter (col : Collider) {
    var player : FPSPlayer = col.GetComponent(FPSPlayer);

    if (player) {
        player.ApplyDamage(10000);
    } else if (col.rigidbody) { 
        Destroy(col.rigidbody.gameObject);
    } else {
        Destroy(col.gameObject);
    }
}

function Reset () {
    if (collider == null)   
        gameObject.AddComponent(BoxCollider);
    collider.isTrigger = true;
}

How do i make it so it ignores the collision between the sphere and the robot ???? Physics.IgnoreCollision?

2

You could set up your robots with tags and then query whether or not the object you're colliding with has your robot tag. If it does, you early out.

http://unity3d.com/support/documentation/Components/Tags.html

Like this

function OnCollisionEnter(collision:Collision)
{
    if(collision.gameObject.tag == "Robot")
    {
        Debug.Log("it's a robot");
        return;
    }

    // rest of your code
}
3

Yes. Physics.IgnoreCollision is exactly how you'd ignore physics collisions between two objects.