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Question by plotnus · Nov 10, 2018 at 03:45 AM · 2d2d game2d-physics

OnTriggerStay2D skipped every 25th frame? -- collider turns light green

I have an OnTriggerStay2D that updates a frame variable used by another classes Update function. The frame variables are reset to default values in every LateUpdate. The issue I am running into is that every 25th frame OnTriggerStay2D is not called while Update() is called.

I looked at it in the editor and I noticed that the trigger region becomes duller for the 25th frame.

Do you know what I can do to ensure that OnTriggerStay2D is called every frame when it is triggered?

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Answer by UnityCoach · Nov 10, 2018 at 11:53 AM

As it's physics related, OnTriggerStay2D() is called along FixedUpdate, not Update.

What you can do is store every object entering/exiting the trigger in a List, and do things in Update.

 List<Collider2D> colliders = new List<Collider2D>();
 
 void OnTriggerEnter2D (Collider2D other)
 {
     colliders.Add(other);
 }
 
 void OnTriggerExit2D (Collider2D other)
 {
     colliders.Remove(other);
 }
 
 void Update ()
 {
     foreach (Collider col in colliders)
     {
         // do what you want with every collider here
     }
 }
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