Problem creating health bars for enemies.

Question

Hi everyone!

I've been working with Unity for a few days, trying to make a 3rd person shooter. I've been having a lot of issues, but I've been able to resolve them searching for similar issues people found earlier.

My game is wave based, similar to the zombie mode of COD Black Ops (you kill all the zombies, spawn new wave). What I want to do is display a health bar above every enemy since it is instantiated.

The health bar is a prefab, and it consists of an empty GameObject with a script. The health bar has two child Sprites, representing total health and actual health. The prefab is instantiated when an Enemy is created, but the healthbar is not showing.

NOTE: I made a general class Enemy, as I was planning to create different kind of enemies, and then another class extending from it.

Enemy class:

 public class Enemy : MonoBehaviour {
     public int health;
     public int maxHealth;
     public float speed;
     public int munnyQueSuelta;
 
     public int followDistance;
     public int shootDistance;
 
     //referencia a Player
     public GameObject playah;
 
     //referencia a otros objectos
     public GameObject copper;       //prefab
     public GameObject gold;         //prefab
     public GameObject barraVida;    //prefab
 
     void Start () {
         GameObject healthBar = Instantiate(barraVida, transform.position + new Vector3(0f, 1.75f, 0f), transform.rotation) as GameObject;
         healthBar.transform.parent = this.transform;
     }
     
     // Update is called once per frame
     protected void Update () {
         if (maxHealth < health) {
             health = maxHealth;
         }
 
         if (health == 0) {
             Destroy (this.gameObject);
             sueltaLaPasta();       //instantiates coins, no problem with it
         }
     }
 
     public void gotHit(int damage) {
         this.health -= damage;
     }
 }

This is the hierarchy of the HealthBar Gameobject

alt text

I don't even know if this is the correct way to do it, but the only solutions I found were for Unity 4.6, and I didn't find them useful.

Thanks in advance!

EDIT: as an answer to siaran question, this is the inspector of one of the objects. alt text

Answer 1

Answer by siaran · May 27, 2015 at 10:55 AM

Well, let's start with the obvious,

are there SpriteRenderer components attached to the TotalHealth and Health objects?

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paaulinsky · May 27, 2015 at 03:16 PM 0

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Yes, each one has it's own Sprite Renderer activated from start.

siaran · May 28, 2015 at 10:50 AM 0

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Allright. Well, next question, are you sure they are facing the camera properly?

Can you see sprites in the scene/game view if you drag your object into the scene (outside of play mode)?

paaulinsky · May 28, 2015 at 03:32 PM 0

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If I drag the prefab to the scene it is visible. It also has a little script so it always has the same rotation as the camera, making it always perfectly visible for the camera, and it works fine.

If it is useful, I checked if the health bar is even instantiated on runtime by looking at the hierarchy, and I noticed that the Enemy object has no child object, when it should have the health bar as a child.

siaran · May 31, 2015 at 07:29 PM 0

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So from your comment, is the healthbar not instantiated or is the parent object not set properly?

siaran · May 31, 2015 at 07:51 PM 1

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So the healthbar isn't instantiated? So your Start() method isn't called?

The only times that has happened to me was when I accidentally overwrote it in a child class...

Also in this case you may want to write

 GameObject healthBar = (GameObject) Instantiate (//not writing this);

ins$$anonymous$$d of

 GameObject healthBar = Instantiate(//again not writing this) as GameObject;

(The difference is that the 1st method throws an exception if a cast is impossible whereas the second just sets the reference to null).

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Answer 2

Answer by EIQUY3 · May 06, 2016 at 11:27 AM

You should parent your health bar to the canvas or it wont appear in the game. HealthBar.transform.SetParent(Canvas, false);

Note: Canvas is canvas in your game and you need reference of it in your code.

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Problem creating health bars for enemies.

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