Compound collider fires events for each child collider per enter/re-enter the trigger! Is there a reliable way to make it fire only once per compound collider per trigger enter?

Questions & Answers
1

My gameobject is a parent with a rigidbody and children containing colliders. This Object (compound collider) should trigger only once per entering/re-entering the trigger. The standard behaviour on this is that for each child collider in the compound collider a trigger event is fired, actually this makes sense. But, is there any smart way to limit it to the compound collider firing only once per entering/re-entering the trigger and not for each child? In my situation it would be nice to have it fire only once per trigger enter.

Currently I have this code running, it improves the situation but it is not reliable enough:

private var collisionTimeDelta : float = .2;
private var collisionTime : float = 0;

function OnTriggerEnter (collider : Collider) 
{
    if (Time.time > collisionTime)
    {
        collisionTime = Time.time + collisionTimeDelta;
        if(collider.gameObject.tag == "myCollider")
        {   
            DoSomething();      
        }
    }
}
2

I’m imagining this scenario being needed for something like a healing area trigger–where you want your object to get the “Heal Thyself!” message only once, and not once for each collider, when the game object passes through the healing area.

What I would try is designating one collider as the one which acts on the healing message, letting the others ignore it. Or you could add a distinct healing collider to the center of your object so that when it (the healing collider) passes through your healing area trigger, it fires.