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Question by Cocotimba · Dec 31, 2011 at 10:58 AM · arraysmonobehaviour

Gun Class with Array List of Projectiles

I have a class named Gun and I want to have an Array List of projectiles from a Projectile class.

 private List<Projectile> projectiles;
 
 private void addProjectile()
 {
     Projectile current = new Projectile();
     projectiles.Add(current);
 }

While the game is executing I get an error saying "You are trying to create a MonoBehaviour using the 'new' keyword. This is not allowed."

The projectile class has all the information I need plus it points to a mesh of a bullet.

How do I fix this problem?

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Answer by jef.c · Dec 31, 2011 at 11:27 AM

Use the following instead:

GameObject proj = Instantiate( <ProjectileGameObject> ) as GameObject; projectiles.Add( proj.GetComponent<Projectile>() );

Replace <ProjectileGameObject> with a GameObject, usually a prefab of some sort.

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Answer by Sirex · Dec 31, 2011 at 11:17 AM

The problem is that the class Projectile apperatnly inherits from MonoBehaviour, MonoBehaviour is needed to provide the unity functions update, awake, onMouseOpen and is needed to be able to attach a script on a gameObject in the inspector.

You have two solutions:

  1. You remove inheriting from MonoBehaviour in the Projectile class. This only works if Projectile don´t manipulate the world on anyway or use don´t use any GameObject functions.

  2. You add the class Projectile to the GameObject in the inspector then you use the code "projectileClass = gameObject.GetComponent("Projectile")" in the gun class Start() function.

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