Having trouble with instantiating bullets at multiple points via a list of transforms.

Questions & Answers
1

Hi,
I am having trouble with Instantiating bullets at six different transforms that are stored in a List of transforms. It keeps throwing the error (NullReferenceException: Object reference not set to an instance of an object Gun.Shoot() (at Assets/Scripts/Gun.cs:21). I already threw in some Debug.Logs to see if the points I put in the list were null and they weren’t so I am confused, I am also a beginner so that might be why I am stuck on this simple issue.

Here is the code:

Bullet.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class Bullet : MonoBehaviour {
	public float bulletVelocity = 100f;

	public List<Gun> gunSpots = new List<Gun> ();
	[HideInInspector]
	public List<Transform> muzzleSpots = new List<Transform>();

	void Start(){
		FindGunPositions ();

	}

	public void FindGunPositions(){
		foreach (Gun gun in gunSpots) {
			muzzleSpots.Add (gun.transform);
			//Just checking that the gun positions were not null
			//Debug.Log (gun.transform.position);
		}
	}

	void Update(){
		
	}
	

}

Gun.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class Gun : MonoBehaviour {

	public Bullet bulletPrefab;
	Bullet bulletInstance;
	Bullet bulletClass;

	void Start () {
		bulletClass = GetComponent<Bullet> ();
	}
	
	void Update () {
		Shoot ();
	}

	void Shoot(){
		if (Input.GetButton ("Fire1")) {
			foreach (Transform gun in bulletClass.muzzleSpots) {
				Debug.Log (gun.transform.position);
				bulletInstance = Instantiate (bulletPrefab, gun.position, Quaternion.identity) as Bullet;
				bulletInstance.transform.position = bulletInstance.transform.position * Time.deltaTime * bulletClass.bulletVelocity;
			}
		}
	}
}

Thank you for the help in advance!

2

I assume your bulletClass reference is null here:

foreach (Transform gun in bulletClass.muzzleSpots) {
                 Debug.Log (gun.transform.position);

I see you try to get that reference in Start, here:

bulletClass = GetComponent<Bullet> ();

… but I assume that’s failing.

Are both of the above-posted scripts on the same game object?