Unity Load Scene bundle (LoadLevelAdditive)

// From http://blogs.floriancavallo.fr/post/2012/07/28/Unity-Ajout-dynamique-delements-Partie-II-Telechargement-et-affichage.aspx

void Start()
    {
        string url = "http://server.com/scene.unity3d";
        StartCoroutine(StartDownloadScene(url));
    }

void OnGUI()
    {
        if (progress != 100)
        {
            GUILayout.Label(progress + "%");
            GUI.BeginGroup(new Rect(pos.x, pos.y, progress, size.y));

            // Define progress bar texture within customStyle under Normal > Background
            GUI.Box(new Rect(0, 0, size.x, size.y), "", customStyle);

            // Always match BeginGroup calls with an EndGroup call
            GUI.EndGroup();
    }

        }

IEnumerator StartDownloadScene(string url)
    {
        WWW download = new WWW(url);
        while (!download.isDone)
        {
            //Ici on gère la barre de progression
            progress = System.Convert.ToInt32(download.progress * 100);

            //On attend sagement la fin du téléchargement
            yield return null;
        }
        //On charge la scène ainsi téléchargée.
        Application.LoadLevelAdditive("Ma scene");
    }