Im using overlapSphere to get targets for AI, but if there is no targets - i got exception (NullReferenceException), i know, thats ok, no target - no return. But that is so annoying to see tons of this exceptions in console. Is there any way to fix it? Code here.
Error:
NullReferenceException: Object reference not set to an instance of an object
ShellScript.OnCollisionEnter (UnityEngine.Collision collider) (at Assets/Scripts/ShellScript.cs:33)
using System.Collections;
using System.Linq;
using UnityEngine;
public class GunTurret : MonoBehaviour
{
public Animation anim;
Collider curTarget;
public GameObject Shell;
public GameObject Stvol;
public float maxAttackDistance = 20.0f;
public float minAttackDistance = 5f;
public static GameObject shootObject;
GameObject nearestmob;
GameObject temp;
GameObject temp2;
bool canFire = true;
public float RotationSpeed =5;
float maxHP = 100;
float curHP = 100;
public float incDamage;
private GlobalVars gv;
void Start()
{
}
private void Update()
{
takeDamage();
SortTargets();
if (curTarget == null)
{
randomIdle();
SortTargets();
curTarget = nearestmob.collider;
}
else
Targeting();
}
void Targeting()
{
float distance = Vector3.Distance(transform.position, curTarget.transform.position);
var targetRotation = Quaternion.LookRotation((curTarget.transform.position) - transform.position);
if (distance < maxAttackDistance && distance > minAttackDistance)
{
transform.rotation = Quaternion.Lerp(transform.rotation, targetRotation, RotationSpeed * Time.deltaTime);
if (Vector3.Angle(transform.forward, curTarget.transform.position - transform.position) < 20)
if (canFire)
StartCoroutine(fire());
}
else
curTarget = null;
}
private Collider SortTargets()
{
var minDist = minAttackDistance*minAttackDistance;
var turretPosition = this.transform.position;
//Debug.Log("scan");
Collider[] cols = Physics.OverlapSphere(turretPosition, maxAttackDistance);
float closestMobDistance =0.0f;
foreach (Collider col in cols)
{
if (col.tag == "Monster")
{
var dist = ((col.transform.position - turretPosition).sqrMagnitude);
if (dist > minDist)
{
if ((dist < closestMobDistance) || (closestMobDistance == 0))
{
closestMobDistance = dist;
nearestmob = col.gameObject.gameObject;
}
}
}
}
if (nearestmob != null)
return nearestmob.collider;
else
return null;
}
void randomIdle()
{
// Debug.Log("idle");
var x = Random.Range(1, 3);
if (x==1)
anim.CrossFadeQueued("idle1");
if (x==2)
anim.CrossFadeQueued("idle2");
if (x == 3)
anim.CrossFadeQueued("idle3");
}
private IEnumerator fire()
{
{
anim.CrossFade("fire");
canFire = false;
yield return new WaitForSeconds(0.9f);
Instantiate(Shell, Stvol.transform.position, Quaternion.LookRotation(curTarget.transform.position - transform.position));
StartCoroutine(reload());
}
}
IEnumerator reload()
{
anim.CrossFade("reload");
yield return new WaitForSeconds(5.0f);
canFire = true;
}
private void takeDamage()
{
curHP -= incDamage;
incDamage = 0;
if (curHP <= 0)
Destroy(gameObject);
}
private void OnDestroy()
{
if (gv != null)
{
gv.TurretList.Remove(gameObject);
gv.TurretCount--;
}
}
}
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