How to ignore collisions on the same layer?

Questions & Answers
1

I want to use Physics.IgnoreCollision to avoid bullets hitting themselves.
The bullets are spawned on layer 8. Why is this not working?

// bulletscript.cs
gameObject.layer = 8;

// maingamescript.cs
Physics.IgnoreCollision(8,8);

There may also be other objects on layer 8 that should also be ignored.
(for example, the player ship).

2

You tagged your question as 2D Game, so i belive you should be using Physics2D.IgnoreLayerCollision();

Also note that it has to be IgnoreLayerCollision and not IgnoreCollision. Your code above shouldn’t even compile.

I don’t know much about the Project, but can’t you use the Edit → Project Settings → Physics2D and uncheck the layers you don’t want to collide ?

@KokodokoGames