[SOLVED] OnTriggerEnter2D first collision causes lag/freeze

Unity Engine
1

Hey all, I’m currently developing a mobile game and I ran into a small problem. When my player first collides with an enemy, the game freezes for a bit.

The weird thing is that this happens only when first time OnTriggerenter2D is called. Enemies that collide with my player afterwards do not cause any lag. I profiled the game and it shows that three things cause this issue, specifically: Physics2D.CompileContactCallbacks, Physics2D.SendContactcallbacks and Physics2D.SendTriggerContactCallbacks.

My player has a dynamic rigidbody2D attached as well as BoxCollider2D that has set OnTrigger to true. The same applies to the enemies, except the rigidbody2D is set to kinematic.

Here’s a screenshot from the profiler: Imgur: The magic of the Internet

I’m testing it on Samsung S4 mini.

Any ideas how to fix this?

Thanks!

2

The profiler seems to be indicating that it’s something that is happening in your Enemy.OnTriggerEnter2D script and not the internal methods you mention above. Something is taking half a second! I presume you’ve tried taking out all the code there to check this is the case?

1 Like
3

You’re definitely right! I was so tired yesterday that I didn’t even notice or realize that, I must be blind. After getting some sleep I found out that in the Enemy.OnTriggerEnter2D I’m using a method that saves picked up coins using (System.IO) File.Open that caused the freeze.

Thanks a lot for your time to answer my question I really appreciate that!

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