Getting Bullets to fire in Direction of Gun Barrel (104279)

[michellejean]

I am making a game which involves two turrets which rotate 360 degrees and fire when I press the space bar. I am stuck with making the bullets actually fire in the direction the turret is facing. I am trying to get the rotation from the parent object of the turret because that part that actually swivels. When I am running the game and I rotate the turrets using the keyboard it is the pivot (the parent object of the turret) y-axis which changes. I need to find a way to get the rotation of the y-axis and have the bullet fire in that direction. The way I am currently trying to get the rotation is leaving me with numbers which are barely above zero (might as well be zero) even though I can see in the inspector that the y value is changing so obviously I am grabbing the wrong value.

    using UnityEngine;
    using System.Collections;
     
    public class TurretScript : MonoBehaviour {
     
        public Rigidbody2D Bullet;
        public float bulletSpeed = .01f;
        private float turretRotationSpeed = 5f;
        void Update () {
            if(Input.GetKey(KeyCode.S) && gameObject.tag == "T1")
                counterClockwise();
            if(Input.GetKey(KeyCode.J) && gameObject.tag == "T2")
                counterClockwise();
            if (Input.GetKey (KeyCode.F) && gameObject.tag == "T1")
                clockwise ();
            if (Input.GetKey (KeyCode.L) && gameObject.tag == "T2")
                clockwise ();
            if (Input.GetKey (KeyCode.Space)) {
                fire ();
            }
        }
    fire(){
        Rigidbody2D newBullet = (Rigidbody2D) Instantiate(Bullet, transform.GetChild(0).position, transform.rotation);
	    float xDir = transform.parent.rotation.x;
	    float yDir = transform.parent.rotation.y;
	    Debug.Log (xDir + "    " + yDir);
	    Vector2 force = new Vector2 (xDir * bulletSpeed, yDir * bulletSpeed);
	    newBullet.AddForce(force);}
    }

[Clet]

You could put an empty game object child of the rotating part of your turret. Place its local position at the tip of the cannon and add a reference to this gameObject’s transform from your turret script.

Make sure the zAxis of the transform is pointing towards the direction you want the bullet to go when fired and then, spawn bullets at this location and add use the empty gameObject’s transform.forward to know which way to shoot.

Here’s a script example

using UnityEngine;

public class Bullet : MonoBehaviour {

	public float speed;
	public Vector3 direction;

	private void Update () {
		transform.position += direction * speed * Time.deltaTime;
	}
}

public class Turret : MonoBehaviour {

	public Transform bulletSpawnT;
	public Bullet bulletPrefab;
	
	private void Update () {
		if(Input.GetKeyDown (KeyCode.Space)) {
			FireBullet();
		}
	}

	private void FireBullet () {
		Bullet newBullet = (Bullet)(Instantiate (bulletPrefab,bulletSpawnT, Quaternion.identity) as GameObject);
		newBullet.direction = bulletSpawnT.forward;
	}
}