health system

The 3d platformer tutorial has everything you will ever need to know from cameras, a health system, enemy AI, and more.

If you feel more like videos, you can try the TornadoTwin's unity video series on youtube.

It have 3 lives and 3 GUI textures and hit by a "fireball" lost a life.

 var lives = 3;
 var livesTexture : Texture2D[];
 var livesTextureSize = 30;

 function OnGUI ()
 {
     var livesTextureRect = Rect(10,5,livesTextureSize,livesTextureSize);
     for (var i : int = 0; i < lives; i++)
     {
         GUI.DrawTexture(livesTextureRect,livesTexture[i], ScaleMode.ScaleToFit, true, 0.0f);
         livesTextureRect.x += livesTextureSize + 10;
     }
 }

 function OnCollisionEnter(collision : Collision)
 {
     if (collision.collider.tag == "fireball")
     {
         if (lives-1 >= 0)
             livesTexture[lives-1] = null;
         lives --;
     }
 }