Getting x and y from an angle. (Unity 2D)

Questions & Answers
1

I have a top-down 2D space shooter. To rotate my ship I use angles. So to fire bullets I have to get x and y to use rigidbody2D.AddForce(). I use this code:

	void Update () {
			GameObject instance = (GameObject)Instantiate (Resources.Load ("Bullet"), bulletSpawn.transform.position, bulletSpawn.transform.rotation);
instance.rigidbody2D.AddForce (new Vector2 ((bulletSpawn.transform.position.x - transform.position.x)*shotPower, (bulletSpawn.transform.position.y - transform.position.y)*shotPower));
			}
//bulletSpawn is the GameObject in the front of my ship, where I fire bullets from. Script is attached to the ship.

The code works fine. The only problem is that when the ship goes fast, the shots are fired not in the way they are intended to (they go more left the faster you go). Hope at least someone will understand this. Sorry for crude grammar.

2

I’m assuming that you want to fire the bullets on whatever angle that the ship is facing. In this case, you don’t want to subtract the bulletSpawn.transform.position by the transform.position, but rather use rigidbody.AddForce( transform.up * shotPower ); assuming that your forward vector of your ship is originally facing the top of the screen.