Why is OnTriggerExit2D called before OnTriggerEnter2D?

Question

I have a scene with lots of 2D colliders (aircraft) flying about, that sometimes get destroyed.

I have a trigger CircleCollider2D that keeps track of all the aircraft that have entered and exited its collider.

Very rarely (less than 1 in 1000) the aircraft collider is destroyed, triggering the OnTriggerExit2D callback slightly before the OnTriggerEnter2D callback:

 08:50:16.942-TargetDetector:  OnTriggerExit2D()  collider id: -31498
 08:50:16.949-TargetDetector:  OnTriggerEnter2D()  collider id: -31498

Has anyone else run into this? Am I doing something stupid?

I'm using Unity 5.6.1f1.

Answer 1

Answer by felixmann · Aug 24, 2017 at 02:22 AM

My work around is to ignore OnTriggeredExit2D callbacks for colliders I have not had a preceding OnTriggeredEnter2D, and OnTriggeredEnter2D callbacks for colliders whose game object is already destroyed (as they will never receive a subsequent OnTriggeredExit2D callback).

This seems like an ugly hack, so any suggestions are welcome :)

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Why is OnTriggerExit2D called before OnTriggerEnter2D?

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