koobas.hobune.stream
How do you find the distance of multiple objects in a array
I am trying to find the distance of multiple enemys in the scene but the code i have only works for one of the enemys then when the other enemys try to attack it does not do any damage. When the one zombie that the code calculates the distance for is destroyed and the other zombies try to attack this error message pulls up:
MissingReferenceException: The object of type 'GameObject' has been destroyed but you are still trying to access it. Your script should either check if it is null or you should not destroy the object.
This is my code:
using UnityEngine; using UnityEngine.UI; using System.Collections; using System.Collections.Generic;
public class FPS_Health : MonoBehaviour { public int count; public Text health; public int ammo_count; public Text ammo; public GameObject bullet; public float dist;
public float time;
public GameObject ammo_weapon;
private AudioSource reload;
public AudioClip reload_weapon;
Transform enemy;
public GameObject player_reload;
public GameObject[] zombie;//The array of zombies (enemys)
public void Start()
{
reload = player_reload.GetComponent<AudioSource> ();
zombie = GameObject.FindGameObjectsWithTag("zombie");
time = 2;
ammo_count = 100;
count = 100;
}
public void Update()
{
foreach (GameObject zombies in zombie) {
dist = Vector3.Distance(zombies.transform.position, transform.position);//only calculates the distance of one of the enemys not all of them
}
if (dist <= 2) {
time -= 1 * Time.deltaTime;
}
if (time <= 0) {
count = count - 10;
SetCountText();
time = 2;
}
if (Input.GetKey (KeyCode.Escape)) {
Application.LoadLevel ("Menu");
}
if (Input.GetKey (KeyCode.R)) {
Application.LoadLevel(Application.loadedLevel);
}
if (count <= 0) {
Application.LoadLevel (Application.loadedLevel);
} else if (count >= 100) {
count = 100;
}
if(Input.GetButtonDown("Fire1"))
{
ammo_count = ammo_count - 1;
SetCountText();
}
if (ammo_count < 0) {
ammo_count = 0;
bullet.SetActive (false);
} else if (ammo_count > 0) {
bullet.SetActive(true);
}
}
void OnCollisionEnter (Collision col)
{
if (col.gameObject.name == "zombie_normal 1 2") {
count = count - 10;
SetCountText();
}
if (col.gameObject.name == "ammo") {
ammo_count = ammo_count + 25;
SetCountText();
Destroy(col.gameObject);
reload.Play ();
}
if (col.gameObject.name == "Health") {
count = count + 10;
SetCountText();
Destroy(col.gameObject);
}
}
void OnTriggerEnter(Collider other)
{
if(other.gameObject.tag == ("ammo"))
{
ammo_count = ammo_count + 25;
SetCountText();
Destroy(other.gameObject);
}
}
void SetCountText ()
{
health.text = "Health: " + count.ToString ();
ammo.text = "Ammo: " + ammo_count.ToString ();
}
}
Here, you overwrites the previously calculated distance dist and ends up keeping the last one:
foreach (GameObject zombies in zombie) {
dist = Vector3.Distance(zombies.transform.position, transform.position);//only calculates the distance of one of the enemys not all of them
}
So your code should look like:
foreach (GameObject zombies in zombie) {
dist = Vector3.Distance(zombies.transform.position, transform.position);//only calculates the distance of one of the enemys not all of them
if (dist <= 2) {
time -= 1 * Time.deltaTime;
}
if (time <= 0) {
count = count - 10;
SetCountText();
time = 2;
}
}
//... Rest of the Update() code
Regarding error message:
MissingReferenceException: The object of type 'GameObject' has been destroyed but you are still trying to access it. Your script should either check if it is null or you should not destroy the object.
Once you do a Destroy() Destroy(other/col.gameObject); you should check this object other/col.gameObject in zombie[] array and remove it from the array too. So on next iteration of Update() the deallocated object will be excluded from for loop:
foreach (GameObject zombies in zombie) { ... }
Hope it helps!
How would i check to see if it is destroyed and remove it from the array?
using OnTriggerEnter and OnCollisionEnter functions. When these events raises you can get the game object.
You wrote: "When the one zombie that the code calculates the distance for is destroyed.." The same code that destroys the zombie needs to remove it from the array. Tip: I'm guessing the FPS_Health class is not the one that destroys the zombie. But the zombie array is in the FPS_Health class for some reason. Two ways to handle this: either move the zombie array out of FPS_Health, or, when a zombie dies, broadcast a message to all game objects to let them know. Then each object can do whatever they want about it (FPS_Health would remove that zombie from its array.)
So what would the code look like because i cant seem to find what i need to type in order to remove the gameobject from the array
