koobas.hobune.stream
OnTriggerExit not called on Destroy()
I instantiate a gameObject that immediately intersects with another gameObject. For both OnTriggerEnter is being fired. When I now destroy one of them, OnTriggerExit is not being fired on the one that is still there. Is this a bug or does this count as intended?
I need to get notice of the fact that the intersection no longer persists, and OnTriggerExit would have been handy here.
Is there another way to do this?
This is almost certainly intended, as after you destroy the object there's no Collider component left to pass to the other object's OnTriggerExit function.
Here's a simple way to handle it, by putting your exit trigger logic in Update where you can check whether the triggering object has been destroyed:
boolean triggered = false;
Collider other;
void OnTriggerEnter( Collider other )
{
triggered = true;
this.other = other;
// put other enter trigger logic here
}
void Update()
{
// check if we've been triggered but the other object has been destroyed
if ( triggered && !other )
{
// put exit trigger logic here
}
// put other update logic here
}
I saw the date, but i need to thank you for the reply. You method fix my problem.
This bug seems to be back in Unity 2018.2.0f2, but I worked around it by implementing observers, so I notify the objects interested in the subject's status, including when it's destroyed.
This shit is in Unity 2018.3.5f, although maybe it should work?
Sorry, dont know if it's a bug or not. As an alternative you could use sendmessage or broadcastmessage
I guess it is not triggerd because the OnTriggerExit() would not have a parameter anymore since the other object does no longer exist. (OnTriggerExit hads over the collider of the object that caused the collision).
I´m thinking of moving the object very far away first and then call Destroy() on it. But I´m not sure if this will be reliable (ti$$anonymous$$g).
Should work do a delayed destroy of you're concerned about ti$$anonymous$$g
hm... OnTriggerStay(), and check if the other's still there? OnTriggerExit() won't be called because that's a kind of collision, just a "negative" one.. you can't compute collision with an object marked for deletion, there would be no point in calling Destroy() then. You can use a Send$$anonymous$$essage although an event would be better.. Any object could subscribe to any other object to get notified of it's destroyment :)
I just use
this.GetComponent<SphereCollider>().radius = 0f;
Destroy(this.gameObject);
Then when the radius it 0 the collider exit before you destroy it
I dont think that this work.
When you reduce radius/size to 0 it will trigger a OnTriggerExit event but also a OnTriggerEnter event subsequently.
So -1 +1 = 0, no effect.
