How to add scripts/components to many gameobjects at the same time?

Unity Engine
1

I have a scene with 116 small objects that all use the same script, GUISkin and so on. Now I have to replace my placeholders with the real objects and I have to reapply two scripts and a GUISkin on all objects, which comes to 348 things to add.

Please tell me there’s a way to apply the same script to multiple objects at a time. I’ve looked in Unity, in the manual and on the forums, but I can’t find anything, I’m just hoping that I suck at searching.

2

Unity itself doesn’t have that functionallity (what a shame, huh?)

Fortunatelly, the guys at Unity Team made an amazing job while making the Editor classes, so we can extend Unity to our needs.

Use this script, save it as “MultiScript.cs” in a folder named “Editor” in your Assets folder:

using UnityEngine;
using UnityEditor;
using System.Collections;

public class MultiScript : EditorWindow
{
    private MonoScript s;
    private string c;
    private bool addToChildren = false;

    [MenuItem("Window/MultiScript")]
    static void Init()
    {
        MultiScript window = (MultiScript)EditorWindow.GetWindow(typeof(MultiScript));
    }

    void OnGUI()
    {
        s = EditorGUILayout.ObjectField("Script to add", s, typeof(MonoScript)) as MonoScript;

        c = "";
        if (Selection.gameObjects.Length > 0)
        {
            for (int i = 0; i < Mathf.Min(10, Selection.gameObjects.Length); i++)
            {
                c += Selection.gameObjects[i].name + "\n";
            }

            if (Selection.gameObjects.Length > 10)
                c += "(" + (Selection.gameObjects.Length - 10) + " more objects)";
        }

        if (s != null)
        {
            addToChildren = GUILayout.Toggle(addToChildren, "Add to all children (recursive add)");
            GUILayout.Label("Objects to receive " + s.name + ":\n\n" + c);
            if (GUILayout.Button("Add " + s.name + " to all " + Selection.gameObjects.Length + " objects")) addScriptToObjects();
        }
        else
            GUILayout.Label("Select a script first");
    }

    void OnInspectorUpdate()
    {
        Repaint();
    }

    private void addScriptToObjects()
    {
        if (Selection.gameObjects.Length > 0)
        {
            foreach (GameObject o in Selection.gameObjects)
            {
                o.AddComponent(s.name);

                if (addToChildren)
                {
                    recursiveAdd(o);
                }
            }
        }
    }

    private void recursiveAdd(GameObject o)
    {
        foreach (Transform t in o.transform)
        {
            t.gameObject.AddComponent(s.name);

            if (t.childCount > 0)
                recursiveAdd(t.gameObject);
        }
    }
}

It’s really simple to use, go to Window → MultiScript.
Select the objects you want to have a script.
If they have children, and you want them to also have that script, check the option.
Select the script you want, and hit the button.

Of course, make a backup before.

Hope it helps!

3

That works like a charm! Thank you very much, you just saved me a lot of time and frustration.

Just a quick question: I get the error “Assets/editor/MultiScript.cs(14,21): warning CS0219: The variable `window’ is assigned but its value is never used”. The script works, but the error hides other “real” errors and is a bit in the way. Do you know what’s wrong?

4

Oops, disregard the question. After minimizing and maximizing the Unity window, the error disappeared.

Thanks again for the script!

5

Don’t worry, it’s just a warning. I’ve copy-pasted the script for showing the window from the docs, lol.

Glad it helped =)

6

Wow, thank you for putting this out there, saved me a TON of time as well.