How does IgnoreCollision work? [SOLVED]

Unity Engine
1

I’m spawning bullets inside the player.

The bullets are rigidbodies, and therefor I need to ignore the collision with the player.

This is exactly what the documentation says that Physics.IgnoreCollision is good for. I try and use it exactly like in the documentation:

Instantiate(pistolBullet, player.transform.position, player.transform.rotation);
                Physics.IgnoreCollision(pistolBullet.collider, collider);

But when I do this, I get an error when I instantiate a bullet saying “Ignore collision failed. Both colliders need to be activated when calling this IgnoreCollision”.

I tried putting the code right after I instantiate, like shown here. But I also tried putting it in the awake of the bullet. But that didn’t help.

I’m not sure how it works, so I’d be greatly appreciative if I could get some help.

Thank you.

2

Both your bullet prefab and the player do have a box collider attached, correct?

 Physics.IgnoreCollision(pistolBullet.collider, collider);

In addition you might want to change that line to…

Physics.IgnoreCollision(pistolBullet.collider, player.collider);

Just so it follows the same convention in the line above. Not critical but good form so you don’t have to think about it next time you read the code.

3

Hey.
Thanks, I got some help and figured it out.

My problem was that I couldn’t use a prefab, I had to use the instantiated object. So I used the code:

                GameObject bullet = (GameObject) Instantiate(pistolBullet, player.transform.position, player.transform.rotation);
                Physics.IgnoreCollision(bullet.collider, collider);

But to answer your question. Yes, they use box colliders. :slight_smile: And yeah, I agree that the second line might follow the convention better. Thanks.