Issue with shooting projectiles in the direction of the arrow keys

Questions & Answers
1

I’m trying to make a small shooter “Binding of Isaac” kind of game and I’m attempting to use the arrow keys to shoot a projectile object. My issue is that I can shoot LEFT and RIGHT perfectly fine but no force is added for the Z axis when shooting UP and DOWN.

if (Input.GetKey (KeyCode.RightArrow) && Time.time > nextFire) {
			//Instantiate (prefab, new Vector3 (playerBody.transform.position.x + 1f, 0.5f, playerBody.transform.position.z), playerBody.rotation);
			GameObject projectile = Instantiate (prefab, new Vector3 (playerBody.transform.position.x + 1f, 0.5f, playerBody.transform.position.z), playerBody.rotation);
			projectile.GetComponent<Rigidbody> ().AddForce (new Vector3(1000, 0));
			nextFire = Time.time + fireRate;
		}

		if (Input.GetKey (KeyCode.LeftArrow) && Time.time > nextFire) {
			GameObject projectile = Instantiate (prefab, new Vector3 (playerBody.transform.position.x - 1f, 0.5f, playerBody.transform.position.z), playerBody.rotation);
			projectile.GetComponent<Rigidbody> ().AddForce (new Vector3(-1000, 0));
			nextFire = Time.time + fireRate;
		}

		if (Input.GetKey (KeyCode.UpArrow) && Time.time > nextFire) {
			Instantiate (prefab, new Vector3 (playerBody.transform.position.x, 0.5f, playerBody.transform.position.z + 1f), playerBody.rotation);
			GameObject projectile = Instantiate (prefab, new Vector3 (playerBody.transform.position.x, 0.5f, playerBody.transform.position.z + 1f), playerBody.rotation);
			projectile.GetComponent<Rigidbody> ().AddForce (new Vector3(0, 0, 1000));
			nextFire = Time.time + fireRate;
		}

		if (Input.GetKey (KeyCode.DownArrow) && Time.time > nextFire) {
			GameObject projectile = Instantiate (prefab, new Vector3 (playerBody.transform.position.x, 0.5f, playerBody.transform.position.z - 1f), playerBody.rotation);
			projectile.GetComponent<Rigidbody> ().AddForce (new Vector3(0, 0, -1000));
			nextFire = Time.time + fireRate;
		}

I really don’t see where the issue lies. Any ideas?

EDIT: I just realised that I froze the projectiles Z axis movement instead of Y which is what I had originally intended). The AddForce was working fine.

2

if I’m correct, when you shoot projectile UP and DOWN it has to fly on Y axis, not Z. For example you should have

projectile.GetComponent<Rigidbody> ().AddForce (new Vector3(0, -1000, 0));

instead of

projectile.GetComponent<Rigidbody> ().AddForce (new Vector3(0, 0, -1000));