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Main problem hear is that the a MenuItem Method has to be static. But if you declare a Transform variable as a static variable then you you can't access it in the editor. Then you can't assign a Prefab to it.

e.g.

static var thingToClone : Transform;
@MenuItem("MyMenu/Thingy")
static function funky {
     var clone = Transform;
     clone = instantiate(thingToClone, Vector3(0,0,0), Quaternion(0,0,0,0));
}

From other questions I think I should us a singleton, but I don't know how to implement that into my code.

Answer 1

Since it is a MenuItem you could use Selection.activeObject to retrieve the currently selected prefab from your project view and instantiate it:

@MenuItem ("MyMenu/Thingy")
static function funky () {
    if (EditorUtility.IsPersistent(Selection.activeObject)) {
        var newGO : GameObject = Selection.activeObject;
        Instantiate(newGO, Vector3.zero, Quaternion.identity);
    }
}

Else if you know exactly what is the prefab you want to instantiate, you could put the prefab in the Resources folder and use it:

@MenuItem ("MyMenu/Thingy")
static function funky () {
    var newGO : GameObject = Resources.Load("Cube");
    Instantiate(newGO, Vector3.zero, Quaternion.identity);
}

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How do I instantiate a Prefab using a MenuItem?

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