koobas.hobune.stream
Need help with enemy spawner
Hi guys,
Iv been trying to make a spawner for my enemies but iv hit a wall. At the moment I have a object (with a script) that deals with the spawning of the enemies and I have a script connected to the enemy object that makes it move towards the player. The problem is that when I destroy all the enemy objects, I cant spawn any more cuz there is no rigidbody to clone. I not sure what to do so any help would be very appreciated (still new to unity).
The following if the code that is in the enemy's and the code in the spawner.
enemy's code
using UnityEngine;
using System.Collections;
public class enemyscript : MonoBehaviour {
float speed = 2.0f;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update ()
{
movement();
}
void movement()
{
transform.position = Vector3.MoveTowards(transform.position,GameObject.Find("player").transform.position,speed * Time.deltaTime);
}
void OnTriggerEnter(Collider other)
{
if(other.gameObject.tag == "Player" || other.gameObject.tag == "bullet")
{
Destroy(gameObject);
}
}
}
spawner code
using UnityEngine;
using System.Collections;
public class enemyspawnman : MonoBehaviour {
public Rigidbody Enemyprefeb;
float delay = 5.0f;
float canspawn = 5;
public float randx, randy, randz;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
enemyspawn ();
}
public void enemyspawn()
{
if (Time.time >= canspawn)
{
randx = Random.Range(-7.0f,7.0f);
randy = Random.Range(-3.0f,4.0f);
randz = Random.Range(4.0f,5.0f);
Enemyprefeb = Instantiate (Enemyprefeb, new Vector3(randx,randy,randz), transform.rotation) as Rigidbody;
canspawn += delay;
}
}
}
Take the Enemy you are cloning currently and save it as a prefab
(Drag it from the Hierarchy to the Project tab)
Now your Enemy is saved as a prefab.
In your script change your public rigidbody to a public GameObject.
In the editor drag the prefab (From the Project View) into the public GameObject slot in the Inspector Tab
Your spawner will now clone the prefab instead of a preexisting GameObject in the scene
Here is a copy of a spawner script I use, be aware of the disclaimer at the top of the code.
/*
* This confidential and proprietary software may be used only as
* authorised by a licensing agreement from ARM Limited
* (C) COPYRIGHT 2014 ARM Limited
* ALL RIGHTS RESERVED
* The entire notice above must be reproduced on all authorised
* copies and copies may only be made to the extent permitted
* by a licensing agreement from ARM Limited.
*/
using UnityEngine;
using System.Collections;
public class SpawnerScript : MonoBehaviour
{
//Public Variables
public GameObject prefabToSpawn;
public float spawnTime;
public float spawnTimeRandom;
//Private Variables
private float spawnTimer;
//Used for initialisation
void Start ()
{
ResetSpawnTimer();
}
//Update is called once per frame
void Update ()
{
spawnTimer -= Time.deltaTime;
if (spawnTimer <= 0.0f)
{
Instantiate(prefabToSpawn, transform.position, Quaternion.identity);
ResetSpawnTimer();
}
}
//Resets the spawn timer with a random offset
void ResetSpawnTimer()
{
spawnTimer = (float)(spawnTime + Random.Range(0, spawnTimeRandom*100)/100.0);
}
}
I hope this helps
P.S : A little tip for the future, avoid using .tag, use CompareTag() instead, ontop of that avoid FindObject or FindObjects, this is really inefficient especially when done on an Update. Try and define as much as possible using the inspector and public variables to avoid searching through every object in your scene unnecessarily
You're very welcome, feel free to mark the question as answered by the way :)
I had the same problem, but I used your script and it worked. The enemy I'm trying to spawn uses a Nav$$anonymous$$eshAgent, and when it spawns the Nav$$anonymous$$eshAgent doesnt work and I get this warning :
Failed to create agent because it is not close enough to the Nav$$anonymous$$esh
When doing this spawning, use a true prefab, not a scene object. Prefabs are like blueprints, and don't exist in the scene. More info:
http://docs.unity3d.com/Documentation/Manual/Prefabs.html
Then in your scene, you don't assign the results of your Instantiate to your prefab. So leave out the 'Enemyprefab =' on line 34.
Iv made the enemy a prefab now but if i take away the 'Enemyprefab =' I get an error since it does not know what to duplicate. Would I move this script onto the enemy true prefab?
What you say doesn't make sense given the changes I recommend. Please post your amended script and the a copy of the error. You still leave 'public Enemyprefab;' at the top of the file, and you initialize this variable with the true prefab you created. You just don't assign the result of the Instantiate back to the 'EnemyPrefab' variable.
so iv changed the line to Instantiate (Enemyprefeb, new Vector3(randx,randy,randz), transform.rotation); and the enemy is a prefab.
the error I when i destroy it is "the object type rigidbody has been destroyed but you are still trying to access it" (since i'm destroying the original still)
You need to destroy the GameObject, not the rigidbody. The Rigidbody is an attribute of the GameObject
This is a separate issue. Nothing in the scripts above attempt to accessing anything in the Rigidbody component. Whatever script is generating this error, need to reacquire the the rigid body either when the current one is destroyed or alternately every frame.
Note if you are always going to be spawning a new copy of this prefab right after the original is destroyed, and alternate solution is to simply move the rigid body to a new position and reset any state to the initial state of the object. This would solve your reference problem since the object is never destroyed.
public Rigidbody Enemyprefeb;
dark_reaper IS accessing the Rigidbody component
Secondly, robertbu's suggestion is also great from optimisation, Instantiate is an expensive function, better to transform to a position out of sight, reset all variables and prepare to reuse the GameObject.
