I have a Problem in Unity where where When when i use specific weapon in game i created and try to instantiate the lauching of a projectile i receive the following error:
Object reference not set to an instance of an object
I dont undestand the problem in my code as i have instantiated the prefab. I am currently following a tutorial in a booki have also searched on the internet and cant find someone with the same problem any help is appreciated:
if (currentWeapon == WEAPON_GRENADE && ammos [WEAPON_GRENADE] >=1 && canShoot)
{
ammos [currentWeapon]--;
GameObject launcher = GameObject.Find("launcher");
GameObject grenadeF = (GameObject) (Instantiate (grenade, launcher.transform.position, Quaternion.identity));
grenadeF.GetComponent<Rigidbody>().AddForce(launcher.transform.forward*200);
canShoot = false;
timer = 0.0f;
timerStarted = true;
}
This is the piece of code;
i have tried to change:
grenadeF
to
grenade
.
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class ManageWeapons : MonoBehaviour {
private const int WEAPON_GUN = 0;
private const int WEAPON_AUTO_GUN = 1;
private const int WEAPON_GRENADE = 2;
private int activeWeapon = WEAPON_GUN;
private float timer;
private bool timerStarted;
private bool canShoot = true;
private int currentWeapon;
private bool [] hasWeapon;
private int [] ammos;
private int [] maxAmmos;
private float [] reloadTime;
private string [] weaponName;
// Use this for initialization
Camera playersCamera;
Ray rayFromPlayer;
RaycastHit hit;
public GameObject sparksAtImpact;
private int gunAmmo = 10;
public GameObject grenade;
// Use this for initialization
void Start ()
{
ammos = new int [3];
hasWeapon = new bool [3];
maxAmmos = new int [3];
reloadTime = new float [3];
weaponName = new string [3];
hasWeapon [WEAPON_GUN] = true;
hasWeapon [WEAPON_AUTO_GUN] = true;
hasWeapon [WEAPON_GRENADE] = true;
weaponName[WEAPON_GUN] = "GUN";
weaponName[WEAPON_AUTO_GUN] = "AUTOMATIC GUN";
weaponName[WEAPON_GRENADE] = "GRENADE";
ammos [WEAPON_GUN] = 10;
ammos [WEAPON_AUTO_GUN] = 10;
ammos [WEAPON_GRENADE] = 10;
maxAmmos [WEAPON_GUN] = 20;
maxAmmos [WEAPON_AUTO_GUN] = 20;
maxAmmos [WEAPON_GRENADE] = 10;
currentWeapon = WEAPON_GUN;
playersCamera = GetComponent<Camera>();
reloadTime [WEAPON_GUN] = 2.0f;
reloadTime [WEAPON_AUTO_GUN] = 0.5f;
reloadTime [WEAPON_GRENADE] = 3.0f;
}
// Update is called once per frame
void Update ()
{
if (timerStarted)
{
timer += Time.deltaTime;
if (timer >= reloadTime [currentWeapon])
{
timerStarted = false;
canShoot = true;
}
}
rayFromPlayer = playersCamera.ScreenPointToRay (new Vector3 (Screen.width/2, Screen.height/2, 0));
Debug.DrawRay(rayFromPlayer.origin, rayFromPlayer.direction * 100, Color.red);
//if (Input.GetKeyDown(KeyCode.F) && gunAmmo>0)
//if (Input.GetKeyDown(KeyCode.F))
if (Input.GetKey(KeyCode.F))
{
//if (currentWeapon == WEAPON_GUN && ammos [WEAPON_GUN] >=1 && canShoot)
if ((currentWeapon == WEAPON_GUN || currentWeapon == WEAPON_AUTO_GUN) && ammos [currentWeapon] >=1 && canShoot)
{
ammos [currentWeapon]--;
GetComponent<AudioSource>().Play();
if (Physics.Raycast(rayFromPlayer, out hit, 100))
{
print (" The object " + hit.collider.gameObject.name +" is in front of the player");
Vector3 positionOfImpact;
positionOfImpact = hit.point;
Instantiate (sparksAtImpact, positionOfImpact, Quaternion.identity);
GameObject objectTargeted;
if (hit.collider.gameObject.tag == "target")
{
objectTargeted = hit.collider.gameObject;
objectTargeted.GetComponent<ManageNPC>().gotHit();
}
}
canShoot = false;
timer = 0.0f;
timerStarted = true;
//gunAmmo --;
//print ("You have "+gunAmmo + " bullets left");
}
if (currentWeapon == WEAPON_GRENADE && ammos [WEAPON_GRENADE] >=1 && canShoot)
{
ammos [currentWeapon]--;
GameObject launcher = GameObject.Find("launcher");
GameObject grenadeF = (GameObject) (Instantiate (grenade, launcher.transform.position, Quaternion.identity));
grenadeF.GetComponent<Rigidbody>().AddForce(launcher.transform.forward*200);
canShoot = false;
timer = 0.0f;
timerStarted = true;
}
}
if (Input.GetKeyDown(KeyCode.Tab))
{
if (hasWeapon[WEAPON_GUN] && hasWeapon[WEAPON_AUTO_GUN] && hasWeapon[WEAPON_GRENADE])
{
currentWeapon++;
if (currentWeapon>2) currentWeapon = 0;
}
else if (hasWeapon[WEAPON_GUN] && hasWeapon[WEAPON_AUTO_GUN])
{
if (currentWeapon == WEAPON_GUN) currentWeapon = WEAPON_AUTO_GUN;
else currentWeapon = WEAPON_GUN;
}
else if (hasWeapon[WEAPON_GUN] && hasWeapon[WEAPON_GRENADE])
{
if (currentWeapon == WEAPON_GUN) currentWeapon = WEAPON_GRENADE;
else currentWeapon = WEAPON_GUN;
}
else if (hasWeapon[WEAPON_AUTO_GUN] && hasWeapon[WEAPON_GRENADE])
{
if (currentWeapon == WEAPON_AUTO_GUN) currentWeapon = WEAPON_GRENADE;
else currentWeapon = WEAPON_AUTO_GUN;
}
else
{
}
print ("Current Weapon: "+ weaponName[currentWeapon] + "("+ammos[currentWeapon]+")");
}
GameObject.Find("userInfo").GetComponent<Text>().text = weaponName[currentWeapon]+ "("+ammos[currentWeapon]+")";
}
public void manageCollisions (ControllerColliderHit hit)
{
/*print ("Collided with " + hit.collider.gameObject.name);
if (hit.collider.gameObject.tag =="ammo_gun")
{
gunAmmo +=5;
if (gunAmmo > 10) gunAmmo = 10;
Destroy (hit.collider.gameObject);
}*/
string tagOfTheOtherObject = hit.collider.gameObject.tag;
if (tagOfTheOtherObject == "ammo_gun" || tagOfTheOtherObject == "ammo_automatic_gun" || tagOfTheOtherObject == "ammo_grenade")
{
int indexOfAmmoBeingUpdated = 0;
if (tagOfTheOtherObject =="ammo_gun") indexOfAmmoBeingUpdated = WEAPON_GUN;
if (tagOfTheOtherObject =="ammo_automatic_gun") indexOfAmmoBeingUpdated = WEAPON_AUTO_GUN;
if (tagOfTheOtherObject =="ammo_grenade") indexOfAmmoBeingUpdated = WEAPON_GRENADE;
ammos [indexOfAmmoBeingUpdated] +=5;
if (ammos [indexOfAmmoBeingUpdated] > maxAmmos[indexOfAmmoBeingUpdated]) ammos[indexOfAmmoBeingUpdated] = maxAmmos[indexOfAmmoBeingUpdated];
Destroy (hit.collider.gameObject);
}
}
}
This is the full script if anyone is interest
And here are images of unity:
As you can see the prefabs are here.
