Hey guys, still learning C# but getting there. Making a shmup and having an issue with my homing missles. When they fire the homing mechanic isn’t working and I’m getting the below error.
NullReferenceException: Object reference not set to an instance of an object
shmup.Bullet.FindEnemies () (at Assets/Shmup/script/misc/Bullet.cs:74)
shmup.Bullet.AimNow () (at Assets/Shmup/script/misc/Bullet.cs:53)
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
namespace shmup
{
public class Bullet : Weapon
{
[Tooltip("Each different bullet prefab MUST have a different Id")]
public int myId;//for garbage
[Space]
[Tooltip("You can have multiple bullet speeds subsequent, in order to create special behavior")]
[SerializeField] float[] speed = new float[1];
int speedSelected;
[Tooltip("If you have mutiple speeds, set here the duration of everyone here")]
[SerializeField] float[] speedDuration = new float[1];
[SerializeField] float acceleration = 0;
float currentAcceleration;
float scaledAcceleration;
//Rigidbody rb;
Transform myTransform;
[Tooltip("You can use it only if harm == Harm.player")]
[SerializeField] bool aimed = false;
bool targetAcquired;
Transform target;
Vector3 targetPosition;
[SerializeField] float aimingDelay = 0;
[Tooltip("The rotation speed of the autoAiming player missile")]
[SerializeField] float maneuverability;
float maneuverabilityIncrement = 0.01f;//to avoid infinite orbit
Color debugColor;
List<Transform> enemyTargets; //avaible enemy targets on the screen
[Tooltip("Partilce FX when the bullet hit something")]
public GameObject sparkFX;
void Start()
{
myTransform = this.transform;
}
void AimNow()
{
if (harm == Harm.enemy)
FindEnemies();
else
AimTarget(1000);
}
void FindEnemies()
{
enemyTargets.Clear();
//find all avaible enemies
GameObject[] enemies = GameObject.FindGameObjectsWithTag("Enemy");
foreach (GameObject enemy in enemies)
{
if (!enemy.activeSelf)
continue;
EnemyAvatar enemyAvatar = enemy.GetComponent<EnemyAvatar>();
BossElement bossElement = enemy.GetComponent<BossElement>();
if (enemyAvatar != null && enemyAvatar.enemy.enabled && enemyAvatar.enemy.vulnerable)//if this enemy is avaible
{
enemyTargets.Add(enemy.transform);
continue;
}
else if (bossElement != null && bossElement.myBoss.vulnerable)
{
enemyTargets.Add(enemy.transform);
continue;
}
}
if (target == null && (enemyTargets.Count > 0))
{
print("enemyTargets.Count: " + enemyTargets.Count);
//sort enemies by distance
enemyTargets.Sort(delegate (Transform t1, Transform t2)
{
return (Vector3.Distance(t1.position, myTransform.position).CompareTo(Vector3.Distance(t2.position, myTransform.position)));
});
//pick most close enemy
target = enemyTargets[0];
targetAcquired = true;
}
}
void ChangeSpeed()
{
if (speedSelected+1 < speed.Length)
{
Invoke("ChangeSpeed", speedDuration[speedSelected]);
speedSelected++;
}
}
// Update is called once per frame
void Update () {
if (targetAcquired)
AimTarget(maneuverability);
MoveForward();
}
void MoveForward()
{
float move = speed[speedSelected] * Time.deltaTime;
if (acceleration>0)
{
currentAcceleration += scaledAcceleration;
myTransform.Translate(Vector3.forward* (move * currentAcceleration));
}
else
myTransform.Translate(Vector3.forward* move);
}
void AimTarget(float rotationSpeed)
{
if (target == null || !target.gameObject.activeSelf)
{
//change target
targetAcquired = false;
target = null;
FindEnemies();
return;
}
Debug.DrawLine(target.position, myTransform.position, debugColor);
//aim
myTransform.rotation = Quaternion.Slerp(myTransform.rotation, Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed * Time.deltaTime);
maneuverability += maneuverabilityIncrement;
}
public override void OnTriggerEnter(Collider coll)
{
base.OnTriggerEnter(coll);
//don't destroy if hit another bullet
/*
Bullet bullet = coll.gameObject.GetComponentInParent<Bullet>();
if (bullet == null)
GarbageMe();*/
}
public override void DestroyMe()
{
GarbageMe();
GarbageManager.THIS.InstantiateGameObj(sparkFX, this.transform.position, 10);
/*
if (sparkFX)
{
GameObject fx = GarbageManager.THIS.GetGameObject(sparkFX, 10);
if (fx != null)
{
fx = Instantiate(fx, this.transform.position, Quaternion.identity);
fx.SetActive(true);
}
}*/
}
public void ExitFromScreen()
{
GarbageMe();
}
void GarbageMe()
{
CancelInvoke();
this.gameObject.SetActive(false);
BulletGarbage.THIS.AddBulletToGarbage(myId, this);
}
public void InstantiateMe(Vector3 startPosition, Quaternion startRotation)
{
destroyMeAtContact = true;
speedSelected = 0;
currentAcceleration = 0;
targetAcquired = false;
target = null;
if (myTransform == null)
myTransform = this.transform;
myTransform.position = startPosition;
myTransform.rotation = startRotation;
if (aimed)
{
if (harm == Harm.player)
{
debugColor = Color.yellow;
target = ShumpSceneManager.sceneManager.playerTransform;
myTransform.SetParent(ShumpSceneManager.sceneManager.bulletsParent);
}
else if (harm == Harm.enemy)
{
debugColor = Color.blue;
enemyTargets = new List<Transform>();
}
}
//Start
if (acceleration > 0)
{
scaledAcceleration = acceleration * 0.1f;
currentAcceleration = scaledAcceleration;
}
this.gameObject.SetActive(true);
if (speed.Length > 1)
Invoke("ChangeSpeed", speedDuration[speedSelected]);
if (aimed)
Invoke("AimNow", aimingDelay);
}
}
}