want to target rocket to nearest gameobject who is tag as Enemy, after instintiate !

can anybody help , after spawning rocket its going towards left direction , this issue can be fixed if it automatically locked its target when get instantiate

Code (CSharp):

1. public class HelicopterRocket : MonoBehaviour
2. {
3.     private new Rigidbody rigidbody;
4.     private bool launched;
5.     public float Speed;
6.     public GameObject ExplosionFx;
7.     bool fire;
8.     void Start()
9.     {
10.         rigidbody = GetComponent<Rigidbody>();
11.         launched = false;
12.         fire = true;
13.     }
14.     // Update is called once per frame
15.     void Update()
16.     {
17.         if (fire==true)
18.         {
19.             rigidbody.isKinematic = false;
20.              rigidbody.velocity = transform.forward * Speed;
21.          
22.             launched = true;
23.             var f = transform.Find("Fire");
24.            var p= f.GetComponent<ParticleSystem>();
25.             var e = p.emission;
26.             e.enabled = true;
27.         }
28.         if (launched)
29.         {
30.             transform.rotation = Quaternion.LookRotation(rigidbody.velocity);
31.          
32.         }
33.      
34.     }
35.     private void OnCollisionEnter(Collision collision)
36.     {
37.         Instantiate(ExplosionFx, transform.position, Quaternion.identity);
38.        Destroy(gameObject);
39.     }
40. }

// launched script

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. public class MissileButtonLauncher : MonoBehaviour
5. {
6.     public GameObject Missileprefab;
7.     public GameObject missileSpwawnpoint;
8.     // Start is called before the first frame update
9.     void Start()
10.     {
11.    
12.     }
13.     // Update is called once per frame
14.     void Update()
15.     {
16.    
17.     }
18.     public void missileLaunched()
19.     {
20.         Instantiate(Missileprefab,missileSpwawnpoint.transform.position, Quaternion.identity);
21.     }
22. }

 

Use code tags (see the first sticky post), it makes it easier to read and talk about your code.

 

done !

 

OK, so in HelicopterRocket's start, you need to:
1) Find all the objects with the desired tag
2) find which one of these is closest

And then continually:
3) Aim towards that object

1 is easy: FindGameObjectsWithTag.
2 is a little harder, but a "find lowest-valued whatever" algorithm is something that you'll want to have in your programming toolchest. It basically looks like:

Code (csharp):

1. GameObject[] allEnemies = FindGameObjectsWithTag("Enemy");
2. GameObject closestEnemy = null;
3. float lowestDist = 99999f;
4. for (int e=0;e<allEnemies.Length;e++) {
5. float thisDist = Vector3.Distance(transform.position, allEnemies[e].transform.position);
6. if (thisDist < lowestDist) {
7. lowestDist = thisDist;
8. closestEnemy = allEnemies[e];
9. }
10. }
11. //now, closestEnemy has a valid value and you can do whatever with it.

 

Depending on the number of rockets and/or enemies that can be present at any one time, it might be a good idea to create a centralized list of enemies, in the game-manager for example, where enemies register themselves on spawn and unregister on despawn. This prevents having to

FindGameObjectsWithTag

every time a missile is fired, which is an expensive operation.


The core of the behaviour is the same:

Code (CSharp):

1.  
2. GameObject GetClosestEnemy() {
3.     GameObject closestEnemy = null;
4.     var closestEnemyDistance = float.PositiveInfinity;
5.     foreach (var enemy in someCollectionOfAllEnemies) {
6.         var enemyDistance = Vector3.Distance(transform.position, enemy.transform.position);
7.         if (enemyDistance < closestEnemyDistance) {
8.             closestEnemy = enemy;
9.             closestEnemyDistance = enemyDistance;
10.         }
11.     }
12. }
13.  

Also, it is recommended to

FindGameObjectsOfType<>

instead of finding by tag, as that avoids the problems related to using "magic strings", and I hear finding by tag is also expensive.

 

not enough experience in coding how can i implement this ! and yes you are right tag system is bit heavy because i also found this kind of issue , but no idea how to define

FindGameObjectsOfType<>

, means in tag system i create tag to distinguished gameobjects , but

FindGameObjectsOfType<>

how system know this game object is enemy , and this game object is ally ?

 

getting error but not getting it how to implement this

 

That is c# generics. Your enemies probably have a specific script that only enemies have. You can use that to find all enemies without using tags or magic strings. Put the script's type between the <>:

FindObjectsOfType<YourEnemyScript>()

 

, after waiting to get response nobody came ,thanks for the reply but i used tag system , i will try this "FindObjectsOfType<YourEnemyScript>()" in updates if i can ! anyways thanks for the awesome reply !

 

Sorry it took a while. I am not very active in the unity forums. I tend to stay in StackOverflow.

It's not that you absolutelly can't use the tag system. It's just that you should generally avoid magic strings, because it is very easy to mess up the references by using the wrong string, making typos, etc, and also very unfriendly to modifications, as strings will still be valid, but the references they represent will not, if you change a tag.

You can make it work with a management system to remove the "magic" part, and make the string references more solid. It's not too hard to do either. Maybe look into c# enums if you really want to implement it like that. But it's not too beginner-friendly, so considering you're not familiar with even generics yet, I'd recommend not doing it just yet.

 

thanks ,