static void ExportOBJFile()
    {
        if (Selection.activeGameObject)
        {
            MeshFilter mf = (MeshFilter)Selection.activeGameObject.GetComponent <MeshFilter>();

            if (mf)
            {
                string path = EditorUtility.SaveFilePanel("OBJ Export Filename", "", mf.gameObject.name + ".obj", "obj");

                if (path.Length != 0)
                {
                    MegaOBJExport.MeshToFile(mf, path);
                }
            }
        }
    }