How to check if object is off-screen?

Hi! I'm trying to make a 2D, dungeon crawler, and I'm trying to make it so that if an ally is off-screen, then it will teleport to the player. unfortunately I have absolutely no idea where to even start with this, I would show you my code, but since i have no idea where to start with this, I don't have any relevant code to post. if you need to see my code, then I will post it though.

I originally just thought i could just check the distance between the Ally and the camera but that would check if it were in a circular area within the camera, and that wouldn't work. i tried doing a bit of research, but i couldn't find anything i could understand.

I could really use some help. Thanks in advance!

TLDR: how do i check if an object is off-screen in my 2D game?

 

I'm not an experienced 2D expert, so I'm not entirely sure, but in theory this should work in 2D too: https://docs.unity3d.com/ScriptReference/Renderer.OnBecameVisible.html

 

Thanks, but it doesn't seem to be working, here's what i wrote,

Code (CSharp):

1.  
2.     void OnBecameInvisible()
3.     {
4.         transform.position = Player.transform.position;
5.     }
6.  

I tried it with OnBecameInvisible and OnBecameVisible, I also made sure to have the scene editor closed so that it wont mess with anything, any idea why it isn't working?

 

@False_Baconator

If it's a dungeon crawler, why don't you just calculate tile distance to player?

If x amount of tiles fit in X and Y directions in camera view, you can make it so that if tile distance is larger than let's say 5 in X and 3 in Y, then teleport the enemy. Although this depends on how you move your player relative to camera...


If you don't want to experiment with tile distances, this seems to work but I haven't used it in my own experiments:

Code (CSharp):

1. var pos = cam.WorldToScreenPoint(transform.position);
2.  
3. outOfBounds = !Screen.safeArea.Contains(pos);
4.  
5. spriteRenderer.color = outOfBounds ? Color.red : Color.white;

So this is just an artificial example. Sprite turns red if it's out of bounds of orthographic camera.

You actually didn't tell, if you are using ortho or perspective camera...