From e264c85a04a8f868d11a220b7b41013d87a1614d Mon Sep 17 00:00:00 2001
From: yyc12345 <yyc12321@outlook.com>
Date: Sun, 3 Apr 2022 22:48:12 +0800
Subject: [PATCH] refactor project. preparing v3.0 development. no debug
 current

---
 README.md                                     |   2 +-
 README_ZH.md                                  |   2 +-
 ballance_blender_plugin/BMFILE_export.py      | 363 +++++++
 ballance_blender_plugin/BMFILE_import.py      | 357 +++++++
 ...reedsmax_align.py => MODS_3dsmax_align.py} |  18 +-
 .../{flatten_uv.py => MODS_flatten_uv.py}     |  13 +-
 .../{rail_uv.py => MODS_rail_uv.py}           |  31 +-
 .../NAMES_rename_via_group.py                 |  35 +
 .../OBJS_add_components.py                    |  56 ++
 .../{add_floor.py => OBJS_add_floors.py}      | 170 ++--
 .../{add_elements.py => OBJS_add_rails.py}    |  64 +-
 .../{config.py => UTILS_constants.py}         |  41 +-
 ballance_blender_plugin/UTILS_file_io.py      |  96 ++
 ballance_blender_plugin/UTILS_functions.py    | 222 +++++
 .../{preferences.py => UTILS_preferences.py}  |   0
 ballance_blender_plugin/UTILS_zip_helper.py   |  48 +
 ballance_blender_plugin/__init__.py           | 140 +--
 ballance_blender_plugin/bm_import_export.py   | 907 ------------------
 ballance_blender_plugin/no_uv_checker.py      |  48 -
 ballance_blender_plugin/utils.py              |  21 -
 20 files changed, 1421 insertions(+), 1213 deletions(-)
 create mode 100644 ballance_blender_plugin/BMFILE_export.py
 create mode 100644 ballance_blender_plugin/BMFILE_import.py
 rename ballance_blender_plugin/{threedsmax_align.py => MODS_3dsmax_align.py} (87%)
 rename ballance_blender_plugin/{flatten_uv.py => MODS_flatten_uv.py} (88%)
 rename ballance_blender_plugin/{rail_uv.py => MODS_rail_uv.py} (82%)
 create mode 100644 ballance_blender_plugin/NAMES_rename_via_group.py
 create mode 100644 ballance_blender_plugin/OBJS_add_components.py
 rename ballance_blender_plugin/{add_floor.py => OBJS_add_floors.py} (69%)
 rename ballance_blender_plugin/{add_elements.py => OBJS_add_rails.py} (54%)
 rename ballance_blender_plugin/{config.py => UTILS_constants.py} (87%)
 create mode 100644 ballance_blender_plugin/UTILS_file_io.py
 create mode 100644 ballance_blender_plugin/UTILS_functions.py
 rename ballance_blender_plugin/{preferences.py => UTILS_preferences.py} (100%)
 create mode 100644 ballance_blender_plugin/UTILS_zip_helper.py
 delete mode 100644 ballance_blender_plugin/bm_import_export.py
 delete mode 100644 ballance_blender_plugin/no_uv_checker.py
 delete mode 100644 ballance_blender_plugin/utils.py

diff --git a/README.md b/README.md
index 8b6ed70..cd62dbb 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ In the dialog, you can select the material to be used. You can also choose the u
 
 You can also select the projection axis for better UV distribution.
 
-### Flatten UV
+#### Flatten UV
 
 In the object editing mode, it is a operator which is used to attach the currently selected surface to the UV. And you can specific the edge which will be attached into the V axis. Note that only convex faces are supported.
 
diff --git a/README_ZH.md b/README_ZH.md
index f1233c3..1d60f27 100644
--- a/README_ZH.md
+++ b/README_ZH.md
@@ -50,7 +50,7 @@ Ballance 3D是一套简单的用于制图3D相关的轻型工具集合，可以
 
 还可以选择投影轴以获取更好的UV分布。
 
-### Flatten UV
+#### Flatten UV
 
 在物体编辑模式下，用于将当前选中面按某一边贴附到V轴上的模式，展开到UV上。注意，只支持凸边面。
 
diff --git a/ballance_blender_plugin/BMFILE_export.py b/ballance_blender_plugin/BMFILE_export.py
new file mode 100644
index 0000000..1b0fbd9
--- /dev/null
+++ b/ballance_blender_plugin/BMFILE_export.py
@@ -0,0 +1,363 @@
+import bpy,bmesh,bpy_extras,mathutils
+import pathlib,zipfile,time,os,tempfile,math
+import struct, shutil
+from bpy_extras import io_utils, node_shader_utils
+from . import UTILS_constants, UTILS_functions, UTILS_file_io, UTILS_zip_helper
+
+class BALLANCE_OT_export_bm(bpy.types.Operator, bpy_extras.io_utils.ExportHelper):
+    """Save a Ballance Map File (BM file spec 1.4)"""
+    bl_idname = "ballance.export_bm"
+    bl_label = 'Export BM'
+    bl_options = {'PRESET'}
+    filename_ext = ".bmx"
+    
+    export_mode: bpy.props.EnumProperty(
+        name="Export mode",
+        items=(('COLLECTION', "Collection", "Export a collection"),
+               ('OBJECT', "Objects", "Export an objects"),
+               ),
+        )
+
+    def execute(self, context):
+        if (self.export_mode == 'COLLECTION' and context.scene.BallanceBlenderPluginProperty.collection_picker is None) or 
+            (self.export_mode == 'OBJECT' and context.scene.BallanceBlenderPluginProperty.object_picker is None):
+            UTILS_functions.show_message_box(("No specific target", ), "Lost parameter", 'ERROR')
+        else:
+            prefs = bpy.context.preferences.addons[__package__].preferences
+
+            if self.export_mode == 'COLLECTION':
+                export_bm(context, self.filepath, 
+                prefs.no_component_collection,
+                self.export_mode, context.scene.BallanceBlenderPluginProperty.collection_picker)
+            elif self.export_mode == 'OBJECT':
+                export_bm(context, self.filepath, 
+                prefs.no_component_collection,
+                self.export_mode, context.scene.BallanceBlenderPluginProperty.object_picker)
+        return {'FINISHED'}
+
+    def draw(self, context):
+        layout = self.layout
+        layout.prop(self, "export_mode")
+        if self.export_mode == 'COLLECTION':
+            layout.prop(context.scene.BallanceBlenderPluginProperty, "collection_picker")
+        elif self.export_mode == 'OBJECT':
+            layout.prop(context.scene.BallanceBlenderPluginProperty, "object_picker")
+
+
+def export_bm(context, bmx_filepath, prefs_fncg, opts_exportMode, opts_exportTarget):
+    # ============================================ alloc a temp folder
+    utils_tempFolderObj = tempfile.TemporaryDirectory()
+    utils_tempFolder = tempFolderObj.name
+    utils_tempTextureFolder = os.path.join(utils_tempFolder, "Texture")
+    os.makedirs(utils_tempTextureFolder)
+    
+    # ============================================ 
+    # find export target. 
+    # do not need check them validation in there. 
+    # just collect them.
+    if opts_exportMode== "COLLECTION":
+        objectList = opts_exportTarget.objects
+    else:
+        objectList = [opts_exportTarget, ]
+
+    # try get fncg collection
+    # fncg stands with forced non-component group
+    try:
+        object_fncgCollection = bpy.data.collections[prefs_fncg]
+    except:
+        object_fncgCollection = None
+   
+    # ============================================ export
+    with open(os.path.join(utils_tempFolder, "index.bm"), "wb") as finfo:
+        UTILS_file_io.write_uint32(finfo, bm_current_version)
+        
+        # ====================== export object
+        meshSet = set()
+        meshList = []
+        meshCount = 0        
+        with open(os.path.join(utils_tempFolder, "object.bm"), "wb") as fobject:
+            for obj in objectList:
+                # only export mesh object
+                if obj.type != 'MESH':
+                    continue
+
+                # clean no mesh object
+                object_blenderMesh = obj.data
+                if object_blenderMesh is None:
+                    continue
+
+                # check component
+                if (object_fncgCollection is not None) and (obj.name in object_fncgCollection.objects):
+                    # it should be set as normal object forcely
+                    object_isComponent = False
+                else:
+                    # check isComponent normally
+                    object_isComponent = is_component(obj.name)
+
+                # triangle first and then group
+                if not object_isComponent:
+                    if object_blenderMesh not in meshSet:
+                        _mesh_triangulate(object_blenderMesh)
+                        meshSet.add(object_blenderMesh)
+                        meshList.append(object_blenderMesh)
+                        object_meshIndex = meshCount
+                        meshCount += 1
+                    else:
+                        object_meshIndex = meshList.index(object_blenderMesh)
+                else:
+                    object_meshIndex = get_component_id(obj.name)
+
+                # get visibility
+                object_isHidden = not obj.visible_get()
+
+                # try get grouping data
+                object_groupList = _try_get_custom_property(obj, 'virtools-group')
+                object_groupList = _set_value_when_none(object_groupList, [])
+
+                # =======================
+                # write to files
+                # write finfo first
+                UTILS_file_io.write_string(finfo, obj.name)
+                UTILS_file_io.write_uint8(finfo, UTILS_constants.BmfileInfoType.OBJECT)
+                UTILS_file_io.write_uint64(finfo, fobject.tell())
+
+                # write fobject
+                UTILS_file_io.write_bool(fobject, object_isComponent)
+                UTILS_file_io.write_bool(fobject, object_isHidden)
+                UTILS_file_io.write_worldMatrix(fobject, obj.matrix_world)
+                UTILS_file_io.write_uint32(fobject, len(object_groupList))
+                for item in object_groupList:
+                    UTILS_file_io.write_string(fobject, item)
+                UTILS_file_io.write_uint32(fobject, object_meshIndex)
+
+        # ====================== export mesh
+        materialSet = set()
+        materialList = []
+        with open(os.path.join(utils_tempFolder, "mesh.bm"), "wb") as fmesh:
+            for mesh in meshList:
+                # split normals
+                mesh.calc_normals_split()
+
+                # write finfo first
+                UTILS_file_io.write_string(finfo, mesh.name)
+                UTILS_file_io.write_uint8(finfo, UTILS_constants.BmfileInfoType.MESH)
+                UTILS_file_io.write_uint64(finfo, fmesh.tell())
+
+                # write fmesh
+                # vertices
+                mesh_vecList = mesh.vertices[:]
+                UTILS_file_io.write_uint32(fmesh, len(mesh_vecList))
+                for vec in mesh_vecList:
+                    #swap yz
+                    UTILS_file_io.write_3vector(fmesh,vec.co[0],vec.co[2],vec.co[1])
+
+                # uv
+                mesh_faceIndexPairs = [(face, index) for index, face in enumerate(mesh.polygons)]
+                UTILS_file_io.write_uint32(fmesh, len(mesh_faceIndexPairs) * 3)
+                if mesh.uv_layers.active is not None:
+                    uv_layer = mesh.uv_layers.active.data[:]
+                    for f, f_index in mesh_faceIndexPairs:
+                        # it should be triangle face, otherwise throw a error
+                        if (f.loop_total != 3):
+                            raise Exception("Not a triangle", f.poly.loop_total)
+
+                        for loop_index in range(f.loop_start, f.loop_start + f.loop_total):
+                            uv = uv_layer[loop_index].uv
+                            # reverse v
+                            UTILS_file_io.write_2vector(fmesh, uv[0], -uv[1])
+                else:
+                    # no uv data. write garbage
+                    for i in range(len(mesh_faceIndexPairs) * 3):
+                        UTILS_file_io.write_2vector(fmesh, 0.0, 0.0)
+
+                # normals
+                UTILS_file_io.write_uint32(fmesh, len(mesh_faceIndexPairs) * 3)
+                for f, f_index in mesh_faceIndexPairs:
+                    # no need to check triangle again
+                    for loop_index in range(f.loop_start, f.loop_start + f.loop_total):
+                        nml = mesh.loops[loop_index].normal
+                        # swap yz
+                        UTILS_file_io.write_3vector(fmesh, nml[0], nml[2], nml[1])
+
+                # face
+                # get material first
+                mesh_usedBlenderMtl = mesh.materials[:]
+                mesh_noMaterial = len(mesh_usedBlenderMtl) == 0
+                for mat in mesh_usedBlenderMtl:
+                    if mat not in materialSet:
+                        materialSet.add(mat)
+                        materialList.append(mat)
+
+                UTILS_file_io.write_uint32(fmesh, len(mesh_faceIndexPairs))
+                mesh_vtIndex = []
+                mesh_vnIndex = []
+                mesh_vIndex = []
+                for f, f_index in mesh_faceIndexPairs:
+                    # confirm material use
+                    if mesh_noMaterial:
+                        mesh_materialIndex = 0
+                    else:
+                        mesh_materialIndex = materialList.index(mesh_usedBlenderMtl[f.material_index])
+
+                    # export face
+                    mesh_vtIndex.clear()
+                    mesh_vnIndex.clear()
+                    mesh_vIndex.clear()
+
+                    counter = 0
+                    for loop_index in range(f.loop_start, f.loop_start + f.loop_total):
+                        mesh_vIndex.append(mesh.loops[loop_index].vertex_index)
+                        mesh_vnIndex.append(f_index * 3 + counter)
+                        mesh_vtIndex.append(f_index * 3 + counter)
+                        counter += 1
+                    # reverse vertices sort
+                    UTILS_file_io.write_face(fmesh,
+                    mesh_vIndex[2], mesh_vtIndex[2], mesh_vnIndex[2],
+                    mesh_vIndex[1], mesh_vtIndex[1], mesh_vnIndex[1],
+                    mesh_vIndex[0], mesh_vtIndex[0], mesh_vnIndex[0])
+
+                    # set used material
+                    UTILS_file_io.write_bool(fmesh, not mesh_noMaterial)
+                    UTILS_file_io.write_uint32(fmesh, mesh_materialIndex)
+
+                # free splited normals
+                mesh.free_normals_split()
+
+        # ====================== export material
+        textureSet = set()
+        textureList = []
+        textureCount = 0        
+        with open(os.path.join(utils_tempFolder, "material.bm"), "wb") as fmaterial:
+            for material in materialList:
+                # write finfo first
+                UTILS_file_io.write_string(finfo, material.name)
+                UTILS_file_io.write_uint8(finfo, UTILS_constants.BmfileInfoType.MATERIAL)
+                UTILS_file_io.write_uint64(finfo, fmaterial.tell())
+
+                # try get original written data
+                material_colAmbient = _try_get_custom_property(material, 'virtools-ambient')
+                material_colDiffuse = _try_get_custom_property(material, 'virtools-diffuse')
+                material_colSpecular = _try_get_custom_property(material, 'virtools-specular')
+                material_colEmissive = _try_get_custom_property(material, 'virtools-emissive')
+                material_specularPower = _try_get_custom_property(material, 'virtools-power')
+
+                # get basic color
+                mat_wrap = node_shader_utils.PrincipledBSDFWrapper(material)
+                if mat_wrap:
+                    use_mirror = mat_wrap.metallic != 0.0
+                    if use_mirror:
+                        material_colAmbient = _set_value_when_none(material_colAmbient, (mat_wrap.metallic, mat_wrap.metallic, mat_wrap.metallic))
+                    else:
+                        material_colAmbient = _set_value_when_none(material_colAmbient, (1.0, 1.0, 1.0))
+                    material_colDiffuse = _set_value_when_none(material_colDiffuse, (mat_wrap.base_color[0], mat_wrap.base_color[1], mat_wrap.base_color[2]))
+                    material_colSpecular = _set_value_when_none(material_colSpecular, (mat_wrap.specular, mat_wrap.specular, mat_wrap.specular))
+                    material_colEmissive = _set_value_when_none(material_colEmissive, mat_wrap.emission_color[:3])
+                    material_specularPower = _set_value_when_none(material_specularPower, 0.0)
+
+                    # confirm texture
+                    tex_wrap = getattr(mat_wrap, "base_color_texture", None)
+                    if tex_wrap:
+                        image = tex_wrap.image
+                        if image:
+                            # add into texture list
+                            if image not in textureSet:
+                                textureSet.add(image)
+                                textureList.append(image)
+                                textureIndex = textureCount
+                                textureCount += 1
+                            else:
+                                textureIndex = textureList.index(image)
+
+                            material_useTexture = True
+                            material_textureIndex = textureIndex
+                        else:
+                            # no texture
+                            material_useTexture = False
+                            material_textureIndex = 0
+                    else:
+                        # no texture
+                        material_useTexture = False
+                        material_textureIndex = 0
+
+                else:
+                    # no Principled BSDF. write garbage
+                    material_colAmbient = _set_value_when_none(material_colAmbient, (0.8, 0.8, 0.8))
+                    material_colDiffuse = _set_value_when_none(material_colDiffuse, (0.8, 0.8, 0.8))
+                    material_colSpecular = _set_value_when_none(material_colSpecular, (0.8, 0.8, 0.8))
+                    material_colEmissive = _set_value_when_none(material_colEmissive, (0.8, 0.8, 0.8))
+                    material_specularPower = _set_value_when_none(material_specularPower, 0.0)
+
+                    material_useTexture = False
+                    material_textureIndex = 0
+
+                UTILS_file_io.write_color(fmaterial, material_colAmbient)
+                UTILS_file_io.write_color(fmaterial, material_colDiffuse)
+                UTILS_file_io.write_color(fmaterial, material_colSpecular)
+                UTILS_file_io.write_color(fmaterial, material_colEmissive)
+                UTILS_file_io.write_float(fmaterial, material_specularPower)
+                UTILS_file_io.write_bool(fmaterial, material_useTexture)
+                UTILS_file_io.write_uint32(fmaterial, material_textureIndex)
+            
+
+        # ====================== export texture
+        texture_blenderFilePath = os.path.dirname(bpy.data.filepath)
+        texture_existedTextureFilepath = set()        
+        with open(os.path.join(utils_tempFolder, "texture.bm"), "wb") as ftexture:
+            for texture in textureList:
+                # write finfo first
+                UTILS_file_io.write_string(finfo, texture.name)
+                UTILS_file_io.write_uint8(finfo, UTILS_constants.BmfileInfoType.TEXTURE)
+                UTILS_file_io.write_uint64(finfo, ftexture.tell())
+
+                # confirm whether it is internal texture
+                # get absolute texture path
+                texture_filepath = io_utils.path_reference(texture.filepath, texture_blenderFilePath, utils_tempTextureFolder,
+                                                            'ABSOLUTE', "", None, texture.library)
+                # get file name and write it
+                texture_filename = os.path.basename(texture_filepath)
+                UTILS_file_io.write_string(ftexture, texture_filename)
+
+                if (_is_external_texture(texture_filename)):
+                    # write directly, use Ballance texture
+                    UTILS_file_io.write_bool(ftexture, True)
+                else:
+                    # copy internal texture, if this file is copied, do not copy it again
+                    UTILS_file_io.write_bool(ftexture, False)
+                    if texture_filename not in texture_existedTextureFilepath:
+                        shutil.copy(texture_filepath, os.path.join(utils_tempTextureFolder, texture_filename))
+                        texture_existedTextureFilepath.add(texture_filename)
+
+
+    # ============================================ 
+    # save zip and clean up folder
+    UTILS_zip_helper.compress(utils_tempFolder, bmx_filepath)
+    utils_tempFolderObj.cleanup()
+
+# ========================================== 
+# blender related functions
+
+def _is_external_texture(name):
+    if name in config.external_texture_list:
+        return True
+    else:
+        return False
+
+def _mesh_triangulate(me):
+    bm = bmesh.new()
+    bm.from_mesh(me)
+    bmesh.ops.triangulate(bm, faces=bm.faces)
+    bm.to_mesh(me)
+    bm.free()
+
+def _try_get_custom_property(obj, field):
+    try:
+        return obj[field]
+    except:
+        return None
+
+def _set_value_when_none(obj, newValue):
+    if obj is None:
+        return newValue
+    else:
+        return obj
+
diff --git a/ballance_blender_plugin/BMFILE_import.py b/ballance_blender_plugin/BMFILE_import.py
new file mode 100644
index 0000000..8bd96b9
--- /dev/null
+++ b/ballance_blender_plugin/BMFILE_import.py
@@ -0,0 +1,357 @@
+import bpy,bmesh,bpy_extras,mathutils
+import pathlib,zipfile,time,os,tempfile,math
+import struct,shutil
+from bpy_extras import io_utils,node_shader_utils
+from bpy_extras.io_utils import unpack_list
+from bpy_extras.image_utils import load_image
+from . import UTILS_constants, UTILS_functions, UTILS_file_io, UTILS_zip_helper
+
+class BALLANCE_OT_import_bm(bpy.types.Operator, bpy_extras.io_utils.ImportHelper):
+    """Load a Ballance Map File (BM file spec 1.4)"""
+    bl_idname = "ballance.import_bm"
+    bl_label = "Import BM "
+    bl_options = {'PRESET', 'UNDO'}
+    filename_ext = ".bmx"
+
+    texture_conflict_strategy: bpy.props.EnumProperty(
+        name="Texture name conflict",
+        items=(('NEW', "New instance", "Create a new instance"),
+               ('CURRENT', "Use current", "Use current"),),
+        description="Define how to process texture name conflict",
+        default='CURRENT',
+        )
+
+    material_conflict_strategy: bpy.props.EnumProperty(
+        name="Material name conflict",
+        items=(('RENAME', "Rename", "Rename the new one"),
+               ('CURRENT', "Use current", "Use current"),),
+        description="Define how to process material name conflict",
+        default='RENAME',
+        )
+
+    mesh_conflict_strategy: bpy.props.EnumProperty(
+        name="Mesh name conflict",
+        items=(('RENAME', "Rename", "Rename the new one"),
+               ('CURRENT', "Use current", "Use current"),),
+        description="Define how to process mesh name conflict",
+        default='RENAME',
+        )
+
+    object_conflict_strategy: bpy.props.EnumProperty(
+        name="Object name conflict",
+        items=(('RENAME', "Rename", "Rename the new one"),
+               ('CURRENT', "Use current", "Use current"),),
+        description="Define how to process object name conflict",
+        default='RENAME',
+        )
+
+    @classmethod
+    def poll(self, context):
+        prefs = bpy.context.preferences.addons[__package__].preferences
+        return (os.path.isdir(prefs.temp_texture_folder) and os.path.isdir(prefs.external_folder))
+
+    def execute(self, context):
+        prefs = bpy.context.preferences.addons[__package__].preferences
+        import_bm(context, self.filepath, 
+                prefs.no_component_collection, prefs.external_folder, prefs.temp_texture_folder,
+                self.texture_conflict_strategy, self.material_conflict_strategy, 
+                self.mesh_conflict_strategy, self.object_conflict_strategy)
+        return {'FINISHED'}
+        
+
+def import_bm(context, bmx_filepath, prefs_fncg, prefs_externalTexture, prefs_tempTextureFolder, opts_texture, opts_material, opts_mesh, opts_object):
+    # ============================================ 
+    # alloc a temp folder for decompress
+    utils_tempFolderObj = tempfile.TemporaryDirectory()
+    utils_tempFolder = utils_tempFolderObj.name
+    utils_tempTextureFolder = os.path.join(utils_tempFolder, "Texture")
+    # decompress
+    UTILS_zip_helper.decompress(utils_tempFolder, bmx_filepath)
+
+    # ============================================ 
+    # read bmx file officially
+    # index.bm
+    objectList = []
+    meshList = []
+    materialList = []
+    textureList = []
+    with open(os.path.join(utils_tempFolder, "index.bm"), "rb") as findex:
+        # check version first
+        index_gottenVersion = UTILS_file_io.read_uint32(findex)
+        if (index_gottenVersion != UTILS_constants.bmfile_currentVersion):
+            # clean temp folder, output error
+            UTILS_functions.show_message_box(
+                ("Unsupported BM spec. Expect: {} Gotten: {}".format(UTILS_constants.bmfile_currentVersion, index_gottenVersion), ), 
+                "Unsupported BM spec", 'ERROR')
+            findex.close()
+            utils_tempFolderObj.cleanup()
+            return
+
+        # collect block header data
+        while len(peek_stream(findex)) != 0:
+            # read
+            index_name = UTILS_file_io.read_string(findex)
+            index_type = UTILS_file_io.read_uint8(findex)
+            index_offset = UTILS_file_io.read_uint64(findex)
+            index_blockCache = _InfoBlockHelper(index_name, index_offset)
+
+            # grouping into list
+            if index_type == UTILS_constants.BmfileInfoType.OBJECT:
+                objectList.append(index_blockCache)
+            elif index_type == UTILS_constants.BmfileInfoType.MESH:
+                meshList.append(index_blockCache)
+            elif index_type == UTILS_constants.BmfileInfoType.MATERIAL:
+                materialList.append(index_blockCache)
+            elif index_type == UTILS_constants.BmfileInfoType.TEXTURE:
+                textureList.append(index_blockCache)
+            else:
+                pass
+
+
+    # texture.bm
+    with open(os.path.join(utils_tempFolder, "texture.bm"), "rb") as ftexture:
+        for item in textureList:
+            # seek to block
+            ftexture.seek(item.offset, os.SEEK_SET)
+
+            # read data
+            texture_filename = UTILS_file_io.read_string(ftexture)
+            texture_isExternal = UTILS_file_io.read_bool(ftexture)
+            if texture_isExternal:
+                (texture_target, skip_init) = UTILS_functions.create_instance_with_option(
+                    UTILS_constants.BmfileInfoType.TEXTURE, item.name, opts_texture,
+                    extra_texture_path= texture_filename, extra_texture_path= prefs_externalTexture)
+            else:
+                # not external. copy temp file into blender temp. then use it.
+                # try copy. if fail, don't need to do more
+                try:
+                    shutil.copy(os.path.join(utils_tempTextureFolder, texture_filename), 
+                        os.path.join(prefs_tempTextureFolder, texture_filename))
+                except:
+                    pass
+
+                (texture_target, skip_init) = UTILS_functions.create_instance_with_option(
+                    UTILS_constants.BmfileInfoType.TEXTURE, item.name, opts_texture,
+                    extra_texture_path= texture_filename, extra_texture_path= prefs_tempTextureFolder)
+            
+            # setup name and blender data for header
+            item.blender_data = texture_target
+
+    # material.bm
+    # WARNING: this code is shared with add_floor - create_or_get_material()
+    with open(os.path.join(utils_tempFolder, "material.bm"), "rb") as fmaterial:
+        for item in materialList:
+            # seek to block
+            fmaterial.seek(item.offset, os.SEEK_SET)
+
+            # read data
+            material_colAmbient = UTILS_file_io.read_3vector(fmaterial)
+            material_colDiffuse = UTILS_file_io.read_3vector(fmaterial)
+            material_colSpecular = UTILS_file_io.read_3vector(fmaterial)
+            material_colEmissive = UTILS_file_io.read_3vector(fmaterial)
+            material_specularPower = UTILS_file_io.read_float(fmaterial)
+            material_useTexture = UTILS_file_io.read_bool(fmaterial)
+            material_texture = UTILS_file_io.read_uint32(fmaterial)
+
+            # alloc basic material
+            (material_target, skip_init) = create_instance_with_option(
+                UTILS_constants.BmfileInfoType.MATERIAL, item.name, opts_material)
+            item.blender_data = material_target
+            if skip_init:
+                continue
+            
+            # try create material nodes
+            UTILS_functions.create_material_nodes(material_target,
+                material_colAmbient, material_colDiffuse, material_colSpecular, material_colEmissive,
+                material_specularPower,
+                textureList[material_texture].blender_data if material_useTexture else None)
+
+    # mesh.bm
+    # WARNING: this code is shared with add_floor
+    with open(os.path.join(utils_tempFolder, "mesh.bm"), "rb") as fmesh:
+        mesh_vList=[]
+        mesh_vtList=[]
+        mesh_vnList=[]
+        mesh_faceList=[]
+        mesh_materialSolt = []
+        for item in meshList:
+            fmesh.seek(item.offset, os.SEEK_SET)
+
+            # create real mesh
+            (mesh_target, skip_init) = create_instance_with_option(
+                UTILS_constants.BmfileInfoType.MESH, item.name, opts_mesh)
+            item.blender_data = mesh_target
+            if skip_init:
+                continue
+
+            mesh_vList.clear()
+            mesh_vtList.clear()
+            mesh_vnList.clear()
+            mesh_faceList.clear()
+            mesh_materialSolt.clear()
+            # in first read, store all data into list
+            mesh_listCount = UTILS_file_io.read_uint32(fmesh)
+            for i in range(mesh_listCount):
+                cache = UTILS_file_io.read_3vector(fmesh)
+                # switch yz
+                mesh_vList.append((cache[0], cache[2], cache[1]))
+            mesh_listCount = UTILS_file_io.read_uint32(fmesh)
+            for i in range(mesh_listCount):
+                cache = UTILS_file_io.read_2vector(fmesh)
+                # reverse v
+                mesh_vtList.append((cache[0], -cache[1]))
+            mesh_listCount = UTILS_file_io.read_uint32(fmesh)
+            for i in range(mesh_listCount):
+                cache = UTILS_file_io.read_3vector(fmesh)
+                # switch yz
+                mesh_vnList.append((cache[0], cache[2], cache[1]))
+            
+            mesh_listCount = UTILS_file_io.read_uint32(fmesh)
+            for i in range(mesh_listCount):
+                mesh_faceData = UTILS_file_io.read_face(fmesh)
+                mesh_useMaterial = UTILS_file_io.read_bool(fmesh)
+                mesh_materialIndex = UTILS_file_io.read_uint32(fmesh)
+
+                if mesh_useMaterial:
+                    mesh_neededMaterial = materialList[mesh_materialIndex].blender_data
+                    if mesh_neededMaterial in mesh_materialSolt:
+                        mesh_blenderMtlIndex = materialSolt.index(mesh_neededMaterial)
+                    else:
+                        mesh_blenderMtlIndex = len(mesh_materialSolt)
+                        mesh_materialSolt.append(mesh_neededMaterial)
+                else:
+                    mesh_blenderMtlIndex = -1
+
+                # we need invert triangle sort
+                mesh_faceList.append((
+                    mesh_faceData[6], mesh_faceData[7], mesh_faceData[8],
+                    mesh_faceData[3], mesh_faceData[4], mesh_faceData[5],
+                    mesh_faceData[0], mesh_faceData[1], mesh_faceData[2],
+                    mesh_blenderMtlIndex
+                ))
+
+            # and then we need add material solt for this mesh
+            for mat in mesh_materialSolt:
+                mesh_target.materials.append(mat)
+
+            # then, we need add correspond count for vertices
+            mesh_target.vertices.add(len(vList))
+            mesh_target.loops.add(len(faceList)*3)  # triangle face confirm
+            mesh_target.polygons.add(len(faceList))
+            mesh_target.uv_layers.new(do_init=False)
+            mesh_target.create_normals_split()
+
+            # add vertices data
+            mesh_target.vertices.foreach_set("co", unpack_list(vList))
+            mesh_target.loops.foreach_set("vertex_index", unpack_list(_flat_vertices_index(mesh_faceList)))
+            mesh_target.loops.foreach_set("normal", unpack_list(_flat_vertices_normal(mesh_faceList, mesh_vnList)))
+            mesh_target.uv_layers[0].data.foreach_set("uv", unpack_list(_flat_vertices_uv(mesh_faceList, mesh_vtList)))
+            for i in range(len(faceList)):
+                mesh_target.polygons[i].loop_start = i * 3
+                mesh_target.polygons[i].loop_total = 3
+                if faceList[i][9] != -1:
+                    mesh_target.polygons[i].material_index = faceList[i][9]
+
+                mesh_target.polygons[i].use_smooth = True
+            
+            mesh_target.validate(clean_customdata=False)
+            mesh_target.update(calc_edges=False, calc_edges_loose=False)
+            
+
+    # object
+    with open(os.path.join(utils_tempFolder, "object.bm"), "rb") as fobject:
+
+        # we need get needed collection first
+        blender_viewLayer = context.view_layer
+        blender_collection = blender_viewLayer.active_layer_collection.collection
+        if prefs_fncg == "":
+            # fncg stands with Forced Non-Component Group
+            object_fncgCollection = None
+        else:
+            try:
+                # try get collection
+                object_fncgCollection = bpy.data.collections[prefs_fncg]
+            except:
+                # fail to get, create new one under active collection instead
+                object_fncgCollection = bpy.data.collections.new(prefs_fncg)
+                blender_collection.children.link(object_fncgCollection)
+
+        # start process it
+        object_groupList = []
+        for item in objectList:
+            fobject.seek(item.offset, os.SEEK_SET)
+
+            # read data
+            object_isComponent = UTILS_file_io.read_bool(fobject)
+            #object_isForcedNoComponent = UTILS_file_io.read_bool(fobject)
+            object_isHidden = UTILS_file_io.read_bool(fobject)
+            object_worldMatrix = UTILS_file_io.read_worldMaterix(fobject)
+            object_groupListCount = UTILS_file_io.read_uint32(fobject)
+            object_groupList.clear()
+            for i in range(object_groupListCount):
+                object_groupList.append(UTILS_file_io.read_string(fobject))
+            object_meshIndex = UTILS_file_io.read_uint32(fobject)
+
+            # got mesh first
+            if object_isComponent:
+                object_neededMesh = UTILS_functions.load_component(object_meshIndex)
+            else:
+                object_neededMesh = meshList[object_meshIndex].blender_data
+
+            # create real object
+            (object_target, skip_init) = create_instance_with_option(
+                UTILS_constants.BmfileInfoType.OBJECT, item.name, opts_object, 
+                extraMesh=object_neededMesh)
+            if skip_init:
+                continue
+
+            # link to correct collection
+            if (object_fncgCollection is not None) and (not object_isComponent) and UTILS_functions.is_component(item.name):
+                # a object should be grouped into fncg should fufill following requirements
+                # fncg is not null
+                # this object is a normal object
+                # but its name match component format
+                object_fncgCollection.objects.link(object_target)
+            else:
+                # otherwise, group it into normal collection
+                blender_collection.objects.link(object_target)
+            object_target.matrix_world = object_worldMatrix
+            object_target.hide_set(object_isHidden)
+
+            # write custom property
+            if len(object_groupList) != 0:
+                object_target['virtools-group'] = tuple(object_groupList)
+
+        # update view layer after all objects has been imported
+        blender_viewLayer.update()
+
+    # release temp folder
+    utils_tempFolderObj.cleanup()
+    
+
+# ========================================== 
+# blender related functions
+
+class _InfoBlockHelper():
+    def __init__(self, name, offset):
+        self.name = name
+        self.offset = offset
+        self.blender_data = None
+
+def _flat_vertices_index(faceList):
+    for item in faceList:
+        yield (item[0], )
+        yield (item[3], )
+        yield (item[6], )
+
+def _flat_vertices_normal(faceList, vnList):
+    for item in faceList:
+        yield vnList[item[2]]
+        yield vnList[item[5]]
+        yield vnList[item[8]]
+
+def _flat_vertices_uv(faceList, vtList):
+    for item in faceList:
+        yield vtList[item[1]]
+        yield vtList[item[4]]
+        yield vtList[item[7]]
diff --git a/ballance_blender_plugin/threedsmax_align.py b/ballance_blender_plugin/MODS_3dsmax_align.py
similarity index 87%
rename from ballance_blender_plugin/threedsmax_align.py
rename to ballance_blender_plugin/MODS_3dsmax_align.py
index cea3e82..adf351d 100644
--- a/ballance_blender_plugin/threedsmax_align.py
+++ b/ballance_blender_plugin/MODS_3dsmax_align.py
@@ -1,5 +1,5 @@
-import bpy,mathutils
-from . import utils
+import bpy, mathutils
+from . import UTILS_functions
 
 class BALLANCE_OT_super_align(bpy.types.Operator):
     """Align object with 3ds Max way"""
@@ -31,10 +31,10 @@ class BALLANCE_OT_super_align(bpy.types.Operator):
 
     @classmethod
     def poll(self, context):
-        return check_align_target()
+        return _check_align_target()
 
     def execute(self, context):
-        align_object(self.align_x, self.align_y, self.align_z, self.current_references, self.target_references)
+        _align_object(self.align_x, self.align_y, self.align_z, self.current_references, self.target_references)
         return {'FINISHED'}
 
     def invoke(self, context, event):
@@ -56,7 +56,7 @@ class BALLANCE_OT_super_align(bpy.types.Operator):
 
 # ============================== method
 
-def check_align_target():
+def _check_align_target():
     if bpy.context.active_object is None:
         return False
 
@@ -69,14 +69,14 @@ def check_align_target():
     
     return True
 
-def align_object(use_x, use_y, use_z, currentMode, targetMode):
+def _align_object(use_x, use_y, use_z, currentMode, targetMode):
     if not (use_x or use_y or use_z):
         return
 
     # calc active object data
     currentObj = bpy.context.active_object
     currentObjBbox = [currentObj.matrix_world @ mathutils.Vector(corner) for corner in currentObj.bound_box]
-    currentObjRef = provideObjRefPoint(currentObj, currentObjBbox, currentMode)
+    currentObjRef = _provide_obj_reference_point(currentObj, currentObjBbox, currentMode)
 
     # calc target
     targetObjList = bpy.context.selected_objects[:]
@@ -86,7 +86,7 @@ def align_object(use_x, use_y, use_z, currentMode, targetMode):
     # process each obj
     for targetObj in targetObjList:
         targetObjBbox = [targetObj.matrix_world @ mathutils.Vector(corner) for corner in targetObj.bound_box]
-        targetObjRef = provideObjRefPoint(targetObj, targetObjBbox, targetMode)
+        targetObjRef = _provide_obj_reference_point(targetObj, targetObjBbox, targetMode)
 
         if use_x:
             targetObj.location.x += currentObjRef.x - targetObjRef.x
@@ -95,7 +95,7 @@ def align_object(use_x, use_y, use_z, currentMode, targetMode):
         if use_z:
             targetObj.location.z += currentObjRef.z - targetObjRef.z
 
-def provideObjRefPoint(obj, vecList, mode):
+def _provide_obj_reference_point(obj, vecList, mode):
     refPoint = mathutils.Vector((0, 0, 0))
 
     if (mode == 'MIN'):
diff --git a/ballance_blender_plugin/flatten_uv.py b/ballance_blender_plugin/MODS_flatten_uv.py
similarity index 88%
rename from ballance_blender_plugin/flatten_uv.py
rename to ballance_blender_plugin/MODS_flatten_uv.py
index aea742c..f004cc5 100644
--- a/ballance_blender_plugin/flatten_uv.py
+++ b/ballance_blender_plugin/MODS_flatten_uv.py
@@ -1,6 +1,6 @@
 import bpy,mathutils
 import bmesh
-from . import utils
+from . import UTILS_functions
 
 class BALLANCE_OT_flatten_uv(bpy.types.Operator):
     """Flatten selected face UV. Only works for convex face"""
@@ -9,7 +9,7 @@ class BALLANCE_OT_flatten_uv(bpy.types.Operator):
     bl_options = {'UNDO'}
 
     reference_edge : bpy.props.IntProperty(
-        name="Reference_edge",
+        name="Reference edge",
         description="The references edge of UV. It will be placed in V axis.",
         min=0,
         soft_min=0,
@@ -33,16 +33,19 @@ class BALLANCE_OT_flatten_uv(bpy.types.Operator):
         return wm.invoke_props_dialog(self)
 
     def execute(self, context):
-        no_processed_count = real_flatten_uv(bpy.context.active_object.data, self.reference_edge)
+        no_processed_count = _real_flatten_uv(bpy.context.active_object.data, self.reference_edge)
         if no_processed_count != 0:
-            utils.ShowMessageBox(("{} faces may not be processed correctly because they have problem.".format(no_processed_count), ), "Warning", 'ERROR')
+            UTILS_functions.show_message_box(
+                ("{} faces may not be processed correctly because they have problem.".format(no_processed_count), ), 
+                "Warning", 'ERROR'
+            )
         return {'FINISHED'}
 
     def draw(self, context):
         layout = self.layout
         layout.prop(self, "reference_edge")
 
-def real_flatten_uv(mesh, reference_edge):
+def _real_flatten_uv(mesh, reference_edge):
     no_processed_count = 0
 
     if mesh.uv_layers.active is None:
diff --git a/ballance_blender_plugin/rail_uv.py b/ballance_blender_plugin/MODS_rail_uv.py
similarity index 82%
rename from ballance_blender_plugin/rail_uv.py
rename to ballance_blender_plugin/MODS_rail_uv.py
index fc78e9d..9ae9f98 100644
--- a/ballance_blender_plugin/rail_uv.py
+++ b/ballance_blender_plugin/MODS_rail_uv.py
@@ -1,7 +1,7 @@
 import bpy,bmesh
 import mathutils
 import bpy.types
-from . import utils, preferences
+from . import UTILS_functions
 
 class BALLANCE_OT_rail_uv(bpy.types.Operator):
     """Create a UV for rail"""
@@ -38,7 +38,7 @@ class BALLANCE_OT_rail_uv(bpy.types.Operator):
 
     @classmethod
     def poll(self, context):
-        return check_rail_target()
+        return _check_rail_target()
 
     def invoke(self, context, event):
         wm = context.window_manager
@@ -46,9 +46,9 @@ class BALLANCE_OT_rail_uv(bpy.types.Operator):
 
     def execute(self, context):
         if context.scene.BallanceBlenderPluginProperty.material_picker == None:
-            utils.ShowMessageBox(("No specific material", ), "Lost parameter", 'ERROR')
+            UTILS_functions.show_message_box(("No specific material", ), "Lost parameter", 'ERROR')
         else:
-            create_rail_uv(self.uv_type, context.scene.BallanceBlenderPluginProperty.material_picker, self.uv_scale, self.projection_axis)
+            _create_rail_uv(self.uv_type, context.scene.BallanceBlenderPluginProperty.material_picker, self.uv_scale, self.projection_axis)
         return {'FINISHED'}
 
     def draw(self, context):
@@ -62,7 +62,7 @@ class BALLANCE_OT_rail_uv(bpy.types.Operator):
 
 # ====================== method
 
-def check_rail_target():
+def _check_rail_target():
     for obj in bpy.context.selected_objects:
         if obj.type != 'MESH':
             continue
@@ -71,7 +71,7 @@ def check_rail_target():
         return True
     return False
 
-def get_distance(iterator):
+def _get_distance(iterator):
     is_first_min = True
     is_first_max = True
     max_value = 0.0
@@ -93,7 +93,7 @@ def get_distance(iterator):
 
     return max_value - min_value
 
-def create_rail_uv(rail_type, material_pointer, scale_size, projection_axis):
+def _create_rail_uv(rail_type, material_pointer, scale_size, projection_axis):
     objList = []
     ignoredObj = []
     for obj in bpy.context.selected_objects:
@@ -125,18 +125,18 @@ def create_rail_uv(rail_type, material_pointer, scale_size, projection_axis):
             # calc proper scale
             if projection_axis == 'X':
                 maxLength = max(
-                    get_distance(vec.co[1] for vec in vecList),
-                    get_distance(vec.co[2] for vec in vecList)
+                    _get_distance(vec.co[1] for vec in vecList),
+                    _get_distance(vec.co[2] for vec in vecList)
                 )
             elif projection_axis == 'Y':
                 maxLength = max(
-                    get_distance(vec.co[0] for vec in vecList),
-                    get_distance(vec.co[2] for vec in vecList)
+                    _get_distance(vec.co[0] for vec in vecList),
+                    _get_distance(vec.co[2] for vec in vecList)
                 )
             elif projection_axis == 'Z':
                 maxLength = max(
-                    get_distance(vec.co[0] for vec in vecList),
-                    get_distance(vec.co[1] for vec in vecList)
+                    _get_distance(vec.co[0] for vec in vecList),
+                    _get_distance(vec.co[1] for vec in vecList)
                 )
             real_scale = 1.0 / maxLength
 
@@ -166,4 +166,7 @@ def create_rail_uv(rail_type, material_pointer, scale_size, projection_axis):
                         uv_layer[loop_index].uv[1] = vecList[index].co[1] * real_scale
 
     if len(ignoredObj) != 0:
-        utils.ShowMessageBox(("Following objects are not processed due to they are not suit for this function now: ", ) + tuple(ignoredObj), "Execution result", 'INFO')
+        UTILS_functions.show_message_box(
+            ("Following objects are not processed due to they are not suit for this function now: ", ) + tuple(ignoredObj), 
+            "Execution result", 'INFO'
+        )
diff --git a/ballance_blender_plugin/NAMES_rename_via_group.py b/ballance_blender_plugin/NAMES_rename_via_group.py
new file mode 100644
index 0000000..06e2bc1
--- /dev/null
+++ b/ballance_blender_plugin/NAMES_rename_via_group.py
@@ -0,0 +1,35 @@
+import bpy,bmesh
+import mathutils
+import bpy.types
+from . import UTILS_functions
+
+class BALLANCE_OT_rename_via_group(bpy.types.Operator):
+    """Rename object via Virtools groups"""
+    bl_idname = "ballance.rename_via_group"
+    bl_label = "Rename via Group"
+    bl_options = {'UNDO'}
+
+    name_standard: bpy.props.EnumProperty(
+        name="Name Standard",
+        description="Choose your prefered name standard",
+        items=(
+            ("YYC", "YYC Tools Chains", "YYC Tools Chains name standard."),
+            ("IMENGYU", "Imengyu Ballance", "Auto grouping name standard for Imengyu/Ballance")
+            ),
+    )
+
+    @classmethod
+    def poll(self, context):
+        return True
+        #return _check_rail_target()
+
+    def invoke(self, context, event):
+        wm = context.window_manager
+        return wm.invoke_props_dialog(self)
+
+    def execute(self, context):
+        return {'FINISHED'}
+
+    def draw(self, context):
+        layout = self.layout
+        layout.prop(self, "name_standard")
\ No newline at end of file
diff --git a/ballance_blender_plugin/OBJS_add_components.py b/ballance_blender_plugin/OBJS_add_components.py
new file mode 100644
index 0000000..56dee4e
--- /dev/null
+++ b/ballance_blender_plugin/OBJS_add_components.py
@@ -0,0 +1,56 @@
+import bpy, mathutils
+from . import UTILS_constants, UTILS_functions
+
+# ================================================= actual add
+
+class BALLANCE_OT_add_components(bpy.types.Operator):
+    """Add sector related elements"""
+    bl_idname = "ballance.add_components"
+    bl_label = "Add elements"
+    bl_options = {'UNDO'}
+
+    elements_type: bpy.props.EnumProperty(
+        name="Type",
+        description="This element type",
+        items=tuple(map(lambda x: (x, x, ""), UTILS_constants.componentList)),
+    )
+
+    attentionElements = ["PC_TwoFlames", "PR_Resetpoint"]
+    uniqueElements = ["PS_FourFlames", "PE_Balloon"]
+
+    elements_sector: bpy.props.IntProperty(
+        name="Sector",
+        description="Define which sector the object will be grouped in",
+        min=1,
+        max=8,
+        default=1,
+    )
+
+    def execute(self, context):
+        # get name
+        if self.elements_type in self.uniqueElements:
+            finalObjectName = self.elements_type + "_01"
+        elif self.elements_type in self.attentionElements:
+            finalObjectName = self.elements_type + "_0" + str(self.elements_sector)
+        else:
+            finalObjectName = self.elements_type + "_0" + str(self.elements_sector) + "_"
+
+        # create object
+        loadedMesh = UTILS_functions.load_component(
+            UTILS_constants.componentList.index(self.elements_type))
+        obj = bpy.data.objects.new(finalObjectName, loadedMesh)
+        UTILS_functions.add_into_scene_and_move_to_cursor(obj)
+
+        return {'FINISHED'}
+
+    def invoke(self, context, event):
+        wm = context.window_manager
+        return wm.invoke_props_dialog(self)
+
+    def draw(self, context):
+        layout = self.layout
+        layout.prop(self, "elements_type")
+        if self.elements_type not in self.uniqueElements:
+            layout.prop(self, "elements_sector")
+        if self.elements_type in self.attentionElements:
+            layout.label(text="Please note that sector is suffix.")
diff --git a/ballance_blender_plugin/add_floor.py b/ballance_blender_plugin/OBJS_add_floors.py
similarity index 69%
rename from ballance_blender_plugin/add_floor.py
rename to ballance_blender_plugin/OBJS_add_floors.py
index 2d8cb32..d2acbfd 100644
--- a/ballance_blender_plugin/add_floor.py
+++ b/ballance_blender_plugin/OBJS_add_floors.py
@@ -3,18 +3,18 @@ import os, math
 from bpy_extras import io_utils,node_shader_utils
 # from bpy_extras.io_utils import unpack_list
 from bpy_extras.image_utils import load_image
-from . import utils, config
+from . import UTILS_constants, UTILS_functions
 
-class BALLANCE_OT_add_floor(bpy.types.Operator):
+class BALLANCE_OT_add_floors(bpy.types.Operator):
     """Add Ballance floor"""
-    bl_idname = "ballance.add_floor"
+    bl_idname = "ballance.add_floors"
     bl_label = "Add floor"
     bl_options = {'UNDO'}
 
     floor_type: bpy.props.EnumProperty(
         name="Type",
         description="Floor type",
-        items=tuple((x, x, "") for x in config.floor_block_dict.keys()),
+        items=tuple((x, x, "") for x in UTILS_constants.floor_blockDict.keys()),
     )
 
     expand_length_1 : bpy.props.IntProperty(
@@ -39,16 +39,16 @@ class BALLANCE_OT_add_floor(bpy.types.Operator):
     )
 
     use_2d_top : bpy.props.BoolProperty(
-        name="Top side"
+        name="Top edge"
     )
     use_2d_right : bpy.props.BoolProperty(
-        name="Right side"
+        name="Right edge"
     )
     use_2d_bottom : bpy.props.BoolProperty(
-        name="Bottom side"
+        name="Bottom edge"
     )
     use_2d_left : bpy.props.BoolProperty(
-        name="Left side"
+        name="Left edge"
     )
     use_3d_top : bpy.props.BoolProperty(
         name="Top face"
@@ -65,10 +65,14 @@ class BALLANCE_OT_add_floor(bpy.types.Operator):
         return os.path.isdir(prefs.external_folder)
 
     def execute(self, context):
+        # get prefs
+        prefs = bpy.context.preferences.addons[__package__].preferences
+        prefs_externalTexture = prefs.external_folder
+
         # load mesh
         objmesh = bpy.data.meshes.new('done_')
-        if self.floor_type in config.floor_basic_block_list:
-            load_basic_floor(
+        if self.floor_type in UTILS_constants.floor_basicBlockList:
+            _load_basic_floor(
                 objmesh, 
                 self.floor_type, 
                 'R0', 
@@ -81,9 +85,10 @@ class BALLANCE_OT_add_floor(bpy.types.Operator):
                 self.use_2d_left,
                 self.use_3d_top,
                 self.use_3d_bottom),
-                (0.0, 0.0))
-        elif self.floor_type in config.floor_derived_block_list:
-            load_derived_floor(
+                (0.0, 0.0),
+                prefs_externalTexture)
+        elif self.floor_type in UTILS_constants.floor_derivedBlockList:
+            _load_derived_floor(
                 objmesh, 
                 self.floor_type,
                 self.height_multiplier, 
@@ -94,7 +99,10 @@ class BALLANCE_OT_add_floor(bpy.types.Operator):
                 self.use_2d_bottom,
                 self.use_2d_left,
                 self.use_3d_top,
-                self.use_3d_bottom))
+                self.use_3d_bottom),
+                prefs_externalTexture)
+        else:
+            raise Exception("Fatal error: unknow floor type.")
 
         # normalization mesh
         objmesh.validate(clean_customdata=False)
@@ -102,7 +110,7 @@ class BALLANCE_OT_add_floor(bpy.types.Operator):
         
         # create object and link it
         obj=bpy.data.objects.new('A_Floor_BMERevenge_', objmesh)
-        utils.AddSceneAndMove2Cursor(obj)
+        UTILS_functions.add_into_scene_and_move_to_cursor(obj)
         return {'FINISHED'}
 
     def invoke(self, context, event):
@@ -111,7 +119,7 @@ class BALLANCE_OT_add_floor(bpy.types.Operator):
 
     def draw(self, context):
         # get floor prototype
-        floor_prototype = config.floor_block_dict[self.floor_type]
+        floor_prototype = UTILS_constants.floor_blockDict[self.floor_type]
 
         # try sync default value
         if self.previous_floor_type != self.floor_type:
@@ -142,13 +150,13 @@ class BALLANCE_OT_add_floor(bpy.types.Operator):
         col.label(text="Expand mode: " + floor_prototype['ExpandType'])
         grids = col.grid_flow(row_major=True, columns=3)
         grids.separator()
-        grids.label(text=config.floor_expand_direction_map[floor_prototype['InitColumnDirection']][floor_prototype['ExpandType']][0])
+        grids.label(text=UTILS_constants.floor_expandDirectionMap[floor_prototype['InitColumnDirection']][floor_prototype['ExpandType']][0])
         grids.separator()
-        grids.label(text=config.floor_expand_direction_map[floor_prototype['InitColumnDirection']][floor_prototype['ExpandType']][3])
-        grids.template_icon(icon_value = config.blenderIcon_floor_dict[self.floor_type])
-        grids.label(text=config.floor_expand_direction_map[floor_prototype['InitColumnDirection']][floor_prototype['ExpandType']][1])
+        grids.label(text=UTILS_constants.floor_expandDirectionMap[floor_prototype['InitColumnDirection']][floor_prototype['ExpandType']][3])
+        grids.template_icon(icon_value = UTILS_constants.icons_floorDict[self.floor_type])
+        grids.label(text=UTILS_constants.floor_expandDirectionMap[floor_prototype['InitColumnDirection']][floor_prototype['ExpandType']][1])
         grids.separator()
-        grids.label(text=config.floor_expand_direction_map[floor_prototype['InitColumnDirection']][floor_prototype['ExpandType']][2])
+        grids.label(text=UTILS_constants.floor_expandDirectionMap[floor_prototype['InitColumnDirection']][floor_prototype['ExpandType']][2])
         grids.separator()
 
         col.separator()
@@ -164,13 +172,13 @@ class BALLANCE_OT_add_floor(bpy.types.Operator):
         grids.prop(self, "use_2d_top")
         grids.separator()
         grids.prop(self, "use_2d_left")
-        grids.template_icon(icon_value = config.blenderIcon_floor_dict[self.floor_type])
+        grids.template_icon(icon_value = UTILS_constants.icons_floorDict[self.floor_type])
         grids.prop(self, "use_2d_right")
         grids.separator()
         grids.prop(self, "use_2d_bottom")
         grids.separator()
 
-def face_fallback(normal_face, expand_face, height):
+def _face_fallback(normal_face, expand_face, height):
     if expand_face == None:
         return normal_face
     
@@ -179,43 +187,44 @@ def face_fallback(normal_face, expand_face, height):
     else:
         return expand_face
 
-def create_or_get_material(material_name):
+def _create_or_get_material(material_name, prefs_externalTexture):
     # WARNING: this code is shared with bm_import_export
-    deconflict_name = "BMERevenge_" + material_name
-    try:
-        m = bpy.data.materials[deconflict_name]
-    except:
-        # it is not existed, we need create a new one
-        m = bpy.data.materials.new(deconflict_name)
-        # we need init it.
-        # load texture first
-        externalTextureFolder = bpy.context.preferences.addons[__package__].preferences.external_folder
-        txur = load_image(config.floor_texture_corresponding_map[material_name], externalTextureFolder, check_existing=False)    # force reload, we don't want it is shared with normal material
-        # create material and link texture
-        m.use_nodes=True
-        for node in m.node_tree.nodes:
-            m.node_tree.nodes.remove(node)
-        bnode=m.node_tree.nodes.new(type="ShaderNodeBsdfPrincipled")
-        mnode=m.node_tree.nodes.new(type="ShaderNodeOutputMaterial")
-        m.node_tree.links.new(bnode.outputs[0],mnode.inputs[0])
+    deconflict_mtl_name = "BMERevenge_" + material_name
 
-        inode=m.node_tree.nodes.new(type="ShaderNodeTexImage")
-        inode.image=txur
-        m.node_tree.links.new(inode.outputs[0],bnode.inputs[0])
+    # create or get material
+    (mtl, skip_init) = UTILS_functions.create_instance_with_option(
+        UTILS_constants.BmfileInfoType.MATERIAL,
+        deconflict_mtl_name, 'CURRENT'
+    )
+    if skip_init:
+        return mtl
 
-        # write custom property
-        for try_item in config.floor_material_statistic:
-            if material_name in try_item['member']:
-                m['virtools-ambient'] = try_item['data']['ambient']
-                m['virtools-diffuse'] = try_item['data']['diffuse']
-                m['virtools-specular'] = try_item['data']['specular']
-                m['virtools-emissive'] = try_item['data']['emissive']
-                m['virtools-power'] = try_item['data']['power']
-                break
+    # initialize material parameter
+    # load texture first
+    texture_filename = UTILS_constants.floor_textureReflactMap[material_name]
+    deconflict_texture_name = "BMERevenge_" + texture_filename
+    (texture, skip_init) = UTILS_functions.create_instance_with_option(
+        UTILS_constants.BmfileInfoType.TEXTURE,
+        deconflict_texture_name, 'CURRENT',
+        extra_texture_path = prefs_externalTexture, extra_texture_filename = texture_filename
+    )
 
+    # iterate material statistic to get corresponding mtl data
+    for try_item in UTILS_constants.floor_materialStatistic:
+        if material_name in try_item['member']:
+            # got it
+            # set material data
+            UTILS_functions.create_material_nodes(mtl,
+                try_item['data']['ambient'], try_item['data']['diffuse'], 
+                try_item['data']['specular'], try_item['data']['emissive'],
+                try_item['data']['power'],
+                texture)
+            break
+    
+    # return mtl
     return m
 
-def solve_vec_data(str_data, d1, d2, d3, unit, unit_height):
+def _solve_vec_data(str_data, d1, d2, d3, unit, unit_height):
     sp = str_data.split(';')
     sp_point = sp[0].split(',')
     vec = [float(sp_point[0]), float(sp_point[1]), float(sp_point[2])]
@@ -236,7 +245,7 @@ def solve_vec_data(str_data, d1, d2, d3, unit, unit_height):
 
     return vec
 
-def rotate_translate_vec(vec, rotation, unit, extra_translate):
+def _rotate_translate_vec(vec, rotation, unit, extra_translate):
     vec[0] -= unit / 2
     vec[1] -= unit / 2
 
@@ -260,7 +269,7 @@ def rotate_translate_vec(vec, rotation, unit, extra_translate):
     )
 
 
-def solve_uv_data(str_data, d1, d2, d3, unit):
+def _solve_uv_data(str_data, d1, d2, d3, unit):
     sp = str_data.split(';')
     sp_point = sp[0].split(',')
     vec = [float(sp_point[0]), float(sp_point[1])]
@@ -281,7 +290,7 @@ def solve_uv_data(str_data, d1, d2, d3, unit):
 
     return tuple(vec)
 
-def solve_normal_data(point1, point2, point3):
+def _solve_normal_data(point1, point2, point3):
     vector1 = (
         point2[0] - point1[0],
         point2[1] - point1[1],
@@ -309,7 +318,7 @@ def solve_normal_data(point1, point2, point3):
 
     return tuple(nor)
 
-def solve_smashed_position(str_data, d1, d2):
+def _solve_smashed_position(str_data, d1, d2):
     sp=str_data.split(';')
     sp_pos = sp[0].split(',')
     sp_sync = sp[1].split(',')
@@ -325,7 +334,7 @@ def solve_smashed_position(str_data, d1, d2):
 
     return tuple(vec)
 
-def virtual_foreach_set(collection, field, base_num, data):
+def _virtual_foreach_set(collection, field, base_num, data):
     counter = 0
     for i in data:
         exec("a[j]." + field + "=q", {}, {
@@ -345,8 +354,8 @@ sides_struct should be a tuple and it always have 6 bool items
 WARNING: this code is shared with bm import export
 
 '''
-def load_basic_floor(mesh, floor_type, rotation, height_multiplier, d1, d2, sides_struct, extra_translate):
-    floor_prototype = config.floor_block_dict[floor_type]
+def _load_basic_floor(mesh, floor_type, rotation, height_multiplier, d1, d2, sides_struct, extra_translate, prefs_externalTexture):
+    floor_prototype = UTILS_constants.floor_blockDict[floor_type]
 
     # set some unit
     height_unit = 5.0
@@ -360,13 +369,13 @@ def load_basic_floor(mesh, floor_type, rotation, height_multiplier, d1, d2, side
     # got all needed faces
     needCreatedFaces = []
     if sides_struct[0]:
-        needCreatedFaces.append(face_fallback(floor_prototype['TwoDTopSide'], floor_prototype['TwoDTopSideExpand'], height_multiplier))
+        needCreatedFaces.append(_face_fallback(floor_prototype['TwoDTopSide'], floor_prototype['TwoDTopSideExpand'], height_multiplier))
     if sides_struct[1]:
-        needCreatedFaces.append(face_fallback(floor_prototype['TwoDRightSide'], floor_prototype['TwoDRightSideExpand'], height_multiplier))
+        needCreatedFaces.append(_face_fallback(floor_prototype['TwoDRightSide'], floor_prototype['TwoDRightSideExpand'], height_multiplier))
     if sides_struct[2]:
-        needCreatedFaces.append(face_fallback(floor_prototype['TwoDBottomSide'], floor_prototype['TwoDBottomSideExpand'], height_multiplier))
+        needCreatedFaces.append(_face_fallback(floor_prototype['TwoDBottomSide'], floor_prototype['TwoDBottomSideExpand'], height_multiplier))
     if sides_struct[3]:
-        needCreatedFaces.append(face_fallback(floor_prototype['TwoDLeftSide'], floor_prototype['TwoDLeftSideExpand'], height_multiplier))
+        needCreatedFaces.append(_face_fallback(floor_prototype['TwoDLeftSide'], floor_prototype['TwoDLeftSideExpand'], height_multiplier))
     if sides_struct[4]:
         needCreatedFaces.append(floor_prototype['ThreeDTopFace'])
     if sides_struct[5]:
@@ -382,7 +391,7 @@ def load_basic_floor(mesh, floor_type, rotation, height_multiplier, d1, d2, side
             new_texture = face['Textures']
             if new_texture not in materialDict.keys():
                 # try get from existed solt
-                pending_material = create_or_get_material(new_texture)
+                pending_material = _create_or_get_material(new_texture, prefs_externalTexture)
                 if pending_material not in allmat:
                     # no matched. add it
                     mesh.materials.append(pending_material)
@@ -406,12 +415,12 @@ def load_basic_floor(mesh, floor_type, rotation, height_multiplier, d1, d2, side
     for face_define in needCreatedFaces:
         base_indices = len(vecList)
         for vec in face_define['Vertices']:
-            vecList.append(rotate_translate_vec(
-                    solve_vec_data(vec, d1, d2, height_multiplier, block_3dworld_unit, height_unit), 
+            vecList.append(_rotate_translate_vec(
+                    _solve_vec_data(vec, d1, d2, height_multiplier, block_3dworld_unit, height_unit), 
                     rotation, block_3dworld_unit, extra_translate))
 
         for uv in face_define['UVs']:
-            uvList.append(solve_uv_data(uv, d1, d2, height_multiplier, block_uvworld_unit))
+            uvList.append(_solve_uv_data(uv, d1, d2, height_multiplier, block_uvworld_unit))
 
         for face in face_define['Faces']:
             if face['Type'] == 'RECTANGLE':
@@ -431,7 +440,7 @@ def load_basic_floor(mesh, floor_type, rotation, height_multiplier, d1, d2, side
                 indCount = 3
 
             # we need calc normal and push it into list
-            point_normal = solve_normal_data(vecList[vec_indices[0]], vecList[vec_indices[1]], vecList[vec_indices[2]])
+            point_normal = _solve_normal_data(vecList[vec_indices[0]], vecList[vec_indices[1]], vecList[vec_indices[2]])
             for i in range(indCount):
                 normalList.append(point_normal)
             
@@ -454,10 +463,10 @@ def load_basic_floor(mesh, floor_type, rotation, height_multiplier, d1, d2, side
         # if no uv, create it
         mesh.uv_layers.new(do_init=False)
 
-    virtual_foreach_set(mesh.vertices, "co", global_offset_vec, vecList)
-    virtual_foreach_set(mesh.loops, "vertex_index", global_offset_loops, faceList)
-    virtual_foreach_set(mesh.loops, "normal", global_offset_loops, normalList)
-    virtual_foreach_set(mesh.uv_layers[0].data, "uv", global_offset_loops, uvList)
+    _virtual_foreach_set(mesh.vertices, "co", global_offset_vec, vecList)
+    _virtual_foreach_set(mesh.loops, "vertex_index", global_offset_loops, faceList)
+    _virtual_foreach_set(mesh.loops, "normal", global_offset_loops, normalList)
+    _virtual_foreach_set(mesh.uv_layers[0].data, "uv", global_offset_loops, uvList)
 
     cache_counter = 0
     for i in range(len(faceMatList)):
@@ -469,8 +478,8 @@ def load_basic_floor(mesh, floor_type, rotation, height_multiplier, d1, d2, side
         cache_counter += indCount
     
 
-def load_derived_floor(mesh, floor_type, height_multiplier, d1, d2, sides_struct):
-    floor_prototype = config.floor_block_dict[floor_type]
+def _load_derived_floor(mesh, floor_type, height_multiplier, d1, d2, sides_struct, prefs_externalTexture):
+    floor_prototype = UTILS_constants.floor_blockDict[floor_type]
 
     # set some unit
     if floor_prototype['UnitSize'] == 'Small':
@@ -492,13 +501,13 @@ def load_derived_floor(mesh, floor_type, height_multiplier, d1, d2, sides_struct
 
     # iterate smahsed blocks
     for blk in floor_prototype['SmashedBlocks']:
-        start_pos = solve_smashed_position(blk['StartPosition'], d1, d2)
-        expand_pos = solve_smashed_position(blk['ExpandPosition'], d1, d2)
+        start_pos = _solve_smashed_position(blk['StartPosition'], d1, d2)
+        expand_pos = _solve_smashed_position(blk['ExpandPosition'], d1, d2)
 
         sides_data = tuple(sides_dict[x] for x in blk['SideSync'].split(';'))
 
         # call basic floor creator
-        load_basic_floor(
+        _load_basic_floor(
             mesh,
             blk['Type'],
             blk['Rotation'],
@@ -506,7 +515,8 @@ def load_derived_floor(mesh, floor_type, height_multiplier, d1, d2, sides_struct
             expand_pos[0],
             expand_pos[1],
             sides_data,
-            (start_pos[0] * block_3dworld_unit, start_pos[1] * block_3dworld_unit)
+            (start_pos[0] * block_3dworld_unit, start_pos[1] * block_3dworld_unit),
+            prefs_externalTexture
         )
 
 
diff --git a/ballance_blender_plugin/add_elements.py b/ballance_blender_plugin/OBJS_add_rails.py
similarity index 54%
rename from ballance_blender_plugin/add_elements.py
rename to ballance_blender_plugin/OBJS_add_rails.py
index 01edb8c..aa65684 100644
--- a/ballance_blender_plugin/add_elements.py
+++ b/ballance_blender_plugin/OBJS_add_rails.py
@@ -1,62 +1,9 @@
-import bpy,mathutils
-from . import utils, config, bm_import_export
+import bpy, mathutils
+from . import UTILS_functions
 
-# ================================================= actual add
-
-class BALLANCE_OT_add_elements(bpy.types.Operator):
-    """Add sector related elements"""
-    bl_idname = "ballance.add_elements"
-    bl_label = "Add elements"
-    bl_options = {'UNDO'}
-
-    elements_type: bpy.props.EnumProperty(
-        name="Type",
-        description="This element type",
-        items=tuple(map(lambda x: (x, x, ""), config.component_list)),
-    )
-
-    attentionElements = ["PC_TwoFlames", "PR_Resetpoint"]
-    uniqueElements = ["PS_FourFlames", "PE_Balloon"]
-
-    elements_sector: bpy.props.IntProperty(
-        name="Sector",
-        description="Define which sector the object will be grouped in",
-        min=1,
-        max=8,
-        default=1,
-    )
-
-    def execute(self, context):
-        # get name
-        if self.elements_type in self.uniqueElements:
-            finalObjectName = self.elements_type + "_01"
-        elif self.elements_type in self.attentionElements:
-            finalObjectName = self.elements_type + "_0" + str(self.elements_sector)
-        else:
-            finalObjectName = self.elements_type + "_0" + str(self.elements_sector) + "_"
-
-        # create object
-        loadedMesh = bm_import_export.load_component(config.component_list.index(self.elements_type))
-        obj = bpy.data.objects.new(finalObjectName, loadedMesh)
-        utils.AddSceneAndMove2Cursor(obj)
-
-        return {'FINISHED'}
-
-    def invoke(self, context, event):
-        wm = context.window_manager
-        return wm.invoke_props_dialog(self)
-
-    def draw(self, context):
-        layout = self.layout
-        layout.prop(self, "elements_type")
-        if self.elements_type not in self.uniqueElements:
-            layout.prop(self, "elements_sector")
-        if self.elements_type in self.attentionElements:
-            layout.label(text="Please note that sector is suffix.")
-
-class BALLANCE_OT_add_rail(bpy.types.Operator):
+class BALLANCE_OT_add_rails(bpy.types.Operator):
     """Add rail"""
-    bl_idname = "ballance.add_rail"
+    bl_idname = "ballance.add_rails"
     bl_label = "Add rail section"
     bl_options = {'UNDO'}
 
@@ -113,7 +60,7 @@ class BALLANCE_OT_add_rail(bpy.types.Operator):
             bpy.ops.object.join()
 
         # apply 3d cursor
-        utils.Move2Cursor(firstObj)
+        UTILS_functions.add_into_scene_and_move_to_cursor(obj)
 
         return {'FINISHED'}
 
@@ -127,3 +74,4 @@ class BALLANCE_OT_add_rail(bpy.types.Operator):
         layout.prop(self, "rail_radius")
         if self.rail_type == 'DOUBLE':
             layout.prop(self, "rail_span")
+
diff --git a/ballance_blender_plugin/config.py b/ballance_blender_plugin/UTILS_constants.py
similarity index 87%
rename from ballance_blender_plugin/config.py
rename to ballance_blender_plugin/UTILS_constants.py
index 0c849b1..605e8fc 100644
--- a/ballance_blender_plugin/config.py
+++ b/ballance_blender_plugin/UTILS_constants.py
@@ -1,7 +1,18 @@
 import json
 import os
 
-external_texture_list = set([
+bmfile_currentVersion = 14
+bmfile_flagUnicode = 0x800
+bmfile_flagDeflatedMaximum = 0x2
+bmfile_globalComment = 'Use BM Spec 1.4'.encode('utf-8')
+
+class BmfileInfoType():
+    OBJECT = 0
+    MESH = 1
+    MATERIAL = 2
+    TEXTURE = 3
+
+bmfile_externalTextureSet = set([
     "atari.avi",
     "atari.bmp",
     "Ball_LightningSphere1.bmp",
@@ -85,7 +96,7 @@ external_texture_list = set([
     "Wood_Raft.bmp"
 ])
 
-component_list = [
+bmfile_componentList = [
     "P_Extra_Life",
     "P_Extra_Point",
     "P_Trafo_Paper",
@@ -120,7 +131,7 @@ format: key is diection, value is a dict
 dict's key is expand mode, value is a tuple
 tuple always have 4 items, it means (TOP_STR, RIGHT_STR, BOTTOM_STR, LEFT_STR)
 '''
-floor_expand_direction_map = {
+floor_expandDirectionMap = {
     "PositiveX": {
         "Static": ("X", "X", "X", "X"),
         "Column": ("X", "X", "D1", "X"),
@@ -143,7 +154,7 @@ floor_expand_direction_map = {
     }
 }
 
-floor_texture_corresponding_map = {
+floor_textureReflactionMap = {
     "FloorSide": "Floor_Side.bmp",
     "FloorTopBorder": "Floor_Top_Border.bmp",
     "FloorTopBorder_ForSide": "Floor_Top_Border.bmp",
@@ -157,8 +168,8 @@ floor_texture_corresponding_map = {
     "BallStone": "Ball_Stone.bmp"
 }
 
-# WARNING: this data is shared with BallanceVirtoolsPlugin - mapping_BM.cpp - fix_blender_texture
-floor_material_statistic = [
+# WARNING: this data is shared with `BallanceVirtoolsPlugin/bvh/features/mapping/fix_texture.cpp`
+floor_materialStatistic = [
     {
         "member": [
                 "FloorSide",
@@ -215,19 +226,19 @@ floor_material_statistic = [
     }
 ]
 
-floor_block_dict = {}
-floor_basic_block_list = []
-floor_derived_block_list = []
+floor_blockDict = {}
+floor_basicBlockList = []
+floor_derivedBlockList = []
 with open(os.path.join(os.path.dirname(__file__), "json", "BasicBlock.json")) as fp:
     for item in json.load(fp):
-        floor_basic_block_list.append(item["Type"])
-        floor_block_dict[item["Type"]] = item
+        floor_basicBlockList.append(item["Type"])
+        floor_blockDict[item["Type"]] = item
 with open(os.path.join(os.path.dirname(__file__), "json", "DerivedBlock.json")) as fp:
     for item in json.load(fp):
-        floor_derived_block_list.append(item["Type"])
-        floor_block_dict[item["Type"]] = item
+        floor_derivedBlockList.append(item["Type"])
+        floor_blockDict[item["Type"]] = item
 
-blenderIcon_floor = None
-blenderIcon_floor_dict = {}
+icons_floor = None
+icons_floorDict = {}
 # blenderIcon_elements = None
 # blenderIcon_elements_dict = {}
\ No newline at end of file
diff --git a/ballance_blender_plugin/UTILS_file_io.py b/ballance_blender_plugin/UTILS_file_io.py
new file mode 100644
index 0000000..0baf0e0
--- /dev/null
+++ b/ballance_blender_plugin/UTILS_file_io.py
@@ -0,0 +1,96 @@
+import bpy,bmesh,bpy_extras,mathutils
+import struct,shutil
+
+# writer
+
+def write_string(fs,str):
+    count=len(str)
+    write_uint32(fs,count)
+    fs.write(str.encode("utf_32_le"))
+
+def write_uint8(fs,num):
+    fs.write(struct.pack("B", num))
+
+def write_uint32(fs,num):
+    fs.write(struct.pack("I", num))
+
+def write_uint64(fs,num):
+    fs.write(struct.pack("Q", num))
+
+def write_bool(fs,boolean):
+    if boolean:
+        write_uint8(fs, 1)
+    else:
+        write_uint8(fs, 0)
+
+def write_float(fs,fl):
+    fs.write(struct.pack("f", fl))
+
+def write_worldMatrix(fs, matt):
+    mat = matt.transposed()
+    fs.write(struct.pack("ffffffffffffffff",
+    mat[0][0],mat[0][2], mat[0][1], mat[0][3],
+    mat[2][0],mat[2][2], mat[2][1], mat[2][3],
+    mat[1][0],mat[1][2], mat[1][1], mat[1][3],
+    mat[3][0],mat[3][2], mat[3][1], mat[3][3]))
+
+def write_3vector(fs, x, y ,z):
+    fs.write(struct.pack("fff", x, y ,z))
+
+def write_color(fs, colors):
+    write_3vector(fs, colors[0], colors[1], colors[2])
+
+def write_2vector(fs, u, v):
+    fs.write(struct.pack("ff", u, v))
+
+def write_face(fs, v1, vt1, vn1, v2, vt2, vn2, v3, vt3, vn3):
+    fs.write(struct.pack("IIIIIIIII", v1, vt1, vn1, v2, vt2, vn2, v3, vt3, vn3))
+
+# reader
+
+def peek_stream(fs):
+    res = fs.read(1)
+    fs.seek(-1, os.SEEK_CUR)
+    return res
+
+def read_float(fs):
+    return struct.unpack("f", fs.read(4))[0]
+
+def read_uint8(fs):
+    return struct.unpack("B", fs.read(1))[0]
+
+def read_uint32(fs):
+    return struct.unpack("I", fs.read(4))[0]
+
+def read_uint64(fs):
+    return struct.unpack("Q", fs.read(8))[0]
+
+def read_string(fs):
+    count  = read_uint32(fs)
+    return fs.read(count*4).decode("utf_32_le")
+
+def read_bool(fs):
+    return read_uint8(fs) != 0
+
+def read_world_materix(fs):
+    p = struct.unpack("ffffffffffffffff", fs.read(4*4*4))
+    res = mathutils.Matrix((
+    (p[0], p[2], p[1], p[3]),
+    (p[8], p[10], p[9], p[11]),
+    (p[4], p[6], p[5], p[7]),
+    (p[12], p[14], p[13], p[15])))
+    return res.transposed()
+
+def read_3vector(fs):
+    return struct.unpack("fff", fs.read(3*4))
+
+def read_2vector(fs):
+    return struct.unpack("ff", fs.read(2*4))
+
+def read_face(fs):
+    return struct.unpack("IIIIIIIII", fs.read(4*9))
+
+def read_component_face(fs):
+    return struct.unpack("IIIIII", fs.read(4*6))
+
+
diff --git a/ballance_blender_plugin/UTILS_functions.py b/ballance_blender_plugin/UTILS_functions.py
new file mode 100644
index 0000000..3fddc5f
--- /dev/null
+++ b/ballance_blender_plugin/UTILS_functions.py
@@ -0,0 +1,222 @@
+import bpy, bmesh, bpy_extras, mathutils
+import struct, shutil
+from bpy_extras.io_utils import unpack_list
+from bpy_extras import io_utils, node_shader_utils
+from . import UTILS_file_io, UTILS_constants
+
+# =================================
+# scene operation
+
+def show_message_box(message, title, icon):
+
+    def draw(self, context):
+        layout = self.layout
+        for item in message:
+            layout.label(text=item, translate=False)
+
+    bpy.context.window_manager.popup_menu(draw, title = title, icon = icon)
+
+def add_into_scene_and_move_to_cursor(obj):
+    Move2Cursor(obj)
+
+    view_layer = bpy.context.view_layer
+    collection = view_layer.active_layer_collection.collection
+    collection.objects.link(obj)
+
+def move_to_cursor(obj):
+    obj.location = bpy.context.scene.cursor.location
+
+# =================================
+# is compoent
+
+def is_component(name):
+    return get_component_id(name) != -1
+
+def get_component_id(name):
+    for ind, comp in enumerate(UTILS_constants.bmfile_componentList):
+        if name.startswith(comp):
+            return ind
+    return -1
+
+# =================================
+# create material
+
+def create_material_nodes(input_mtl, ambient, diffuse, specular, emissive,
+        specular_power, texture):
+
+    # adding material nodes
+    input_mtl.use_nodes=True
+    for node in input_mtl.node_tree.nodes:
+        input_mtl.node_tree.nodes.remove(node)
+    bnode = input_mtl.node_tree.nodes.new(type="ShaderNodeBsdfPrincipled")
+    mnode = input_mtl.node_tree.nodes.new(type="ShaderNodeOutputMaterial")
+    input_mtl.node_tree.links.new(bnode.outputs[0],mnode.inputs[0])
+
+    input_mtl.metallic = sum(ambient) / 3
+    input_mtl.diffuse_color = [i for i in diffuse] + [1]
+    input_mtl.specular_color = specular
+    input_mtl.specular_intensity = specular_power
+
+    # adding a texture
+    if texture is not None:
+        inode = input_mtl.node_tree.nodes.new(type="ShaderNodeTexImage")
+        inode.image = texture
+        input_mtl.node_tree.links.new(inode.outputs[0], bnode.inputs[0])
+
+    # write custom property
+    input_mtl['virtools-ambient'] = ambient
+    input_mtl['virtools-diffuse'] = diffuse
+    input_mtl['virtools-specular'] = specular
+    input_mtl['virtools-emissive'] = emissive
+    input_mtl['virtools-power'] = specular_power
+   
+# =================================
+# load component
+
+def load_component(component_id):
+    # get file first
+    component_name = UTILS_constants.bmfile_componentList[component_id]
+    selected_file = os.path.join(
+        os.path.dirname(__file__),
+        'meshes',
+        component_name + '.bin'
+    )
+
+    # read file. please note this sector is sync with import_bm's mesh's code. when something change, please change each other.
+    fmesh = open(selected_file, 'rb')
+
+    # create real mesh, we don't need to consider name. blender will solve duplicated name
+    mesh = bpy.data.meshes.new('mesh_' + component_name)
+    
+    vList = []
+    vnList = []
+    faceList = []
+    # in first read, store all data into list
+    listCount = UTILS_file_io.read_uint32(fmesh)
+    for i in range(listCount):
+        cache = UTILS_file_io.read_3vector(fmesh)
+        # switch yz
+        vList.append((cache[0], cache[2], cache[1]))
+    listCount = UTILS_file_io.read_uint32(fmesh)
+    for i in range(listCount):
+        cache = UTILS_file_io.read_3vector(fmesh)
+        # switch yz
+        vnList.append((cache[0], cache[2], cache[1]))
+    
+    listCount = UTILS_file_io.read_uint32(fmesh)
+    for i in range(listCount):
+        faceData = UTILS_file_io.read_component_face(fmesh)
+
+        # we need invert triangle sort
+        faceList.append((
+            faceData[4], faceData[5],
+            faceData[2], faceData[3],
+            faceData[0], faceData[1]
+        ))
+    
+    # then, we need add correspond count for vertices
+    mesh.vertices.add(len(vList))
+    mesh.loops.add(len(faceList)*3)  # triangle face confirmed
+    mesh.polygons.add(len(faceList))
+    mesh.create_normals_split()
+
+    # add vertices data
+    mesh.vertices.foreach_set("co", unpack_list(vList))
+    mesh.loops.foreach_set("vertex_index", unpack_list(_flat_component_vertices_index(faceList)))
+    mesh.loops.foreach_set("normal", unpack_list(_flat_component_vertices_normal(faceList, vnList)))
+    for i in range(len(faceList)):
+        mesh.polygons[i].loop_start = i * 3
+        mesh.polygons[i].loop_total = 3
+
+        mesh.polygons[i].use_smooth = True
+    
+    mesh.validate(clean_customdata=False)
+    mesh.update(calc_edges=False, calc_edges_loose=False)
+
+    fmesh.close()
+
+    return mesh
+
+
+def _flat_component_vertices_index(faceList):
+    for item in faceList:
+        yield (item[0], )
+        yield (item[2], )
+        yield (item[4], )
+
+def _flat_component_vertices_normal(faceList, vnList):
+    for item in faceList:
+        yield vnList[item[1]]
+        yield vnList[item[3]]
+        yield vnList[item[5]]
+
+# =================================
+# create instance with option
+
+def create_instance_with_option(instance_type, instance_name, instance_opt, 
+        extra_mesh = None, extra_texture_path = None, extra_texture_filename = None):
+    """
+    Create instance with opetions
+
+    `instance_type`, `instance_name`, `instance_opt` are essential for each type instances.  
+    For object, you should provide `extra_mesh`.    
+    For texture, you should provide `extra_texture_path` and `extra_texture_filename`.  
+
+    """
+
+    def get_instance():
+        try:
+            if instance_type == UTILS_constants.BmfileInfoType.OBJECT:
+                temp_instance = bpy.data.objects[instance_name]
+            elif instance_type == UTILS_constants.BmfileInfoType.MESH:
+                temp_instance = bpy.data.meshes[instance_name]
+            elif instance_type == UTILS_constants.BmfileInfoType.MATERIAL:
+                temp_instance = bpy.data.materials[instance_name]
+            elif instance_type == UTILS_constants.BmfileInfoType.TEXTURE:
+                temp_instance = bpy.data.textures[instance_name]
+
+            temp_is_existed = True
+        except:
+            temp_is_existed = False
+
+        return (temp_instance, temp_is_existed)
+
+    def create_instance():
+        if instType == UTILS_constants.BmfileInfoType.OBJECT:
+            instance_obj = bpy.data.objects.new(instance_name, extra_mesh)
+            instance_obj.name = instance_name
+        elif instType == UTILS_constants.BmfileInfoType.MESH:
+            instance_obj = bpy.data.meshes.new(instance_name)
+            instance_obj.name = instance_name
+        elif instType == UTILS_constants.BmfileInfoType.MATERIAL:
+            instance_obj = bpy.data.materials.new(instance_name)
+            instance_obj.name = instance_name
+        elif instance_type == UTILS_constants.BmfileInfoType.TEXTURE:
+            # this command will also check current available texture
+            # because `get_instance()` only check texture name
+            # but this strategy is not based on texture filepath, so this create method will 
+            # correct this problem
+            instance_obj = load_image(extra_texture_filename, extra_texture_path, check_existing=(instance_opt == 'CURRENT'))
+            instance_obj.name = instance_name
+
+        return instance_obj
+
+    # analyze options
+    if (not isinstance(instance_opt, str)) or instance_opt == 'RENAME':
+        # create new instance
+        # or always create new instance if opts is not string
+        temp_instance = create_instance()
+        temp_skip_init = True
+    elif instance_opt == 'CURRENT':
+        # try get instance
+        (temp_instance, temp_is_existed) = get_instance()
+        # if got instance successfully, we do not create new one, otherwise, we should 
+        # create new instance
+        if not temp_is_existed:
+            temp_instance = create_instance()
+            temp_skip_init = False
+        else:
+            temp_skip_init = True
+
+    return (temp_instance, temp_skip_init)
+
diff --git a/ballance_blender_plugin/preferences.py b/ballance_blender_plugin/UTILS_preferences.py
similarity index 100%
rename from ballance_blender_plugin/preferences.py
rename to ballance_blender_plugin/UTILS_preferences.py
diff --git a/ballance_blender_plugin/UTILS_zip_helper.py b/ballance_blender_plugin/UTILS_zip_helper.py
new file mode 100644
index 0000000..3fdef26
--- /dev/null
+++ b/ballance_blender_plugin/UTILS_zip_helper.py
@@ -0,0 +1,48 @@
+import pathlib, zipfile, os, shutil
+from . import UTILS_constants
+
+def compress(folder, zip_file):
+    # remove target file first
+    if os.path.isfile(zip_file):
+        os.remove(zip_file)
+    
+    # compress data
+    with zipfile.ZipFile(zip_file, mode= 'w', compression= zipfile.ZIP_DEFLATED, compresslevel= 9, allowZip64= False) as zip_obj:
+        # set global comment
+        zip_obj.comment = UTILS_constants.bmfile_globalComment
+
+        # iterate folder and add files
+        for folder_name, subfolders, filenames in os.walk(folder):
+            for filename in filenames:
+                # construct zip_entry
+                abstract_filepath = os.path.join(folder_name, filename)
+                relative_filepath = os.path.relpath(abstract_filepath, folder)
+                zip_entry = zipfile.ZipInfo.from_file(abstract_filepath, arcname= relative_filepath)
+                zip_entry.compress_type = zipfile.ZIP_DEFLATED
+
+                # compress file
+                with open(abstract_filepath, 'rb') as fs_in:
+                    with zip_obj.open(zip_entry, mode= 'w') as zip_in:
+                        # References
+                        # https://stackoverflow.com/questions/53254622/zipfile-header-language-encoding-bit-set-differently-between-python2-and-python3
+                        # set unicode flag after opening internal file.
+                        # for the shit implement of python module zipfile, we need set Deflated:Maximum manually
+                        zip_entry.flag_bits |= UTILS_constants.bmfile_flagUnicode 
+                        zip_entry.flag_bits |= UTILS_constants.bmfile_flagDeflatedMaximum
+                        # copy file
+                        shutil.copyfileobj(fs_in, zip_in)
+
+               
+def decompress(folder, zip_file):
+    with zipfile.ZipFile(zip_file, mode= 'r', compression= zipfile.ZIP_DEFLATED, compresslevel= 9, allowZip64= False) as zip_obj:
+        for zip_entry in zip_obj.infolist():
+            if (zip_entry.flag_bits & UTILS_constants.bmfile_flagUnicode) == 0:
+                # lost unicode flag, throw error
+                raise Exception("Zip Entry lost UNICODE flag.")
+
+            # decompress file
+            zip_obj.extract(zip_entry, path= folder)
+
+
+            
+        
\ No newline at end of file
diff --git a/ballance_blender_plugin/__init__.py b/ballance_blender_plugin/__init__.py
index aaef418..3584e48 100644
--- a/ballance_blender_plugin/__init__.py
+++ b/ballance_blender_plugin/__init__.py
@@ -2,7 +2,7 @@ bl_info={
 	"name":"Ballance Blender Plugin",
 	"description":"Ballance mapping tools for Blender",
 	"author":"yyc12345",
-	"version":(2,0),
+	"version":(3,0),
 	"blender":(2,83,0),
 	"category":"Object",
 	"support":"TESTING",
@@ -11,36 +11,55 @@ bl_info={
     "tracker_url": "https://github.com/yyc12345/BallanceBlenderHelper/issues"
 }
 
-# ============================================= import system
+# ============================================= 
+# import system
 import bpy,bpy_extras
 import bpy.utils.previews
 import os
 # import my code (with reload)
 if "bpy" in locals():
     import importlib
-    if "bm_import_export" in locals():
-        importlib.reload(bm_import_export)
-    if "rail_uv" in locals():
-        importlib.reload(rail_uv)
-    if "utils" in locals():
-        importlib.reload(utils)
-    if "config" in locals():
-        importlib.reload(config)
-    if "preferences" in locals():
-        importlib.reload(preferences)
-    if "threedsmax_align" in locals():
-        importlib.reload(threedsmax_align)
-    if "no_uv_checker" in locals():
-        importlib.reload(no_uv_checker)
-    if "add_elements" in locals():
-        importlib.reload(add_elements)
-    if "add_floor" in locals():
-        importlib.reload(add_floor)
-    if "flatten_uv" in locals():
-        importlib.reload(flatten_uv)
-from . import config, utils, bm_import_export, rail_uv, preferences, threedsmax_align, no_uv_checker, add_elements, add_floor, flatten_uv
+    if "UTILS_constants" in locals():
+        importlib.reload(UTILS_constants)
+    if "UTILS_functions" in locals():
+        importlib.reload(UTILS_functions)
+    if "UTILS_preferences" in locals():
+        importlib.reload(UTILS_preferences)
+    if "UTILS_file_io" in locals():
+        importlib.reload(UTILS_file_io)
+    if "UTILS_zip_helper" in locals():
+        importlib.reload(UTILS_zip_helper)
 
-# ============================================= menu system
+    if "BMFILE_export" in locals():
+        importlib.reload(BMFILE_export)
+    if "BMFILE_import" in locals():
+        importlib.reload(BMFILE_import)
+
+    if "MODS_rail_uv" in locals():
+        importlib.reload(MODS_rail_uv)
+    if "MODS_3dsmax_align" in locals():
+        importlib.reload(MODS_3dsmax_align)
+    if "MODS_flatten_uv" in locals():
+        importlib.reload(MODS_flatten_uv)
+
+    if "OBJS_add_components" in locals():
+        importlib.reload(OBJS_add_components)
+    if "OBJS_add_floors" in locals():
+        importlib.reload(OBJS_add_floors)
+    if "OBJS_add_rails" in locals():
+        importlib.reload(OBJS_add_rails)
+
+    if "NAMES_rename_via_group" in locals():
+        importlib.reload(NAMES_rename_via_group)
+
+from . import UTILS_constants, UTILS_functions, UTILS_preferences
+from . import BMFILE_export, BMFILE_import
+from . import MODS_3dsmax_align, MODS_flatten_uv, MODS_rail_uv
+from . import OBJS_add_components, OBJS_add_floors, OBJS_add_rails
+from . import NAMES_rename_via_group
+
+# ============================================= 
+# menu system
 
 class BALLANCE_MT_ThreeDViewerMenu(bpy.types.Menu):
     """Ballance related 3D operator"""
@@ -50,10 +69,9 @@ class BALLANCE_MT_ThreeDViewerMenu(bpy.types.Menu):
     def draw(self, context):
         layout = self.layout
 
-        layout.operator("ballance.super_align")
-        layout.operator("ballance.rail_uv")
-        layout.operator("ballance.no_uv_checker")
-        layout.operator("ballance.flatten_uv")
+        layout.operator(MODS_3dsmax_align.BALLANCE_OT_super_align.bl_idname)
+        layout.operator(MODS_rail_uv.BALLANCE_OT_rail_uv.bl_idname)
+        layout.operator(MODS_flatten_uv.BALLANCE_OT_flatten_uv.bl_idname)
 
 class BALLANCE_MT_AddFloorMenu(bpy.types.Menu):
     """Add Ballance floor"""
@@ -64,41 +82,46 @@ class BALLANCE_MT_AddFloorMenu(bpy.types.Menu):
         layout = self.layout
 
         layout.label(text="Basic floor")
-        for item in config.floor_basic_block_list:
-            cop = layout.operator("ballance.add_floor", text=item, icon_value = config.blenderIcon_floor_dict[item])
+        for item in UTILS_constants.floor_basicBlock_list:
+            cop = layout.operator(
+                OBJS_add_floors.BALLANCE_OT_add_floors.bl_idname, 
+                text=item, icon_value = UTILS_constants.icons_floorDict[item])
             cop.floor_type = item
 
         layout.separator()
         layout.label(text="Derived floor")
-        for item in config.floor_derived_block_list:
-            cop = layout.operator("ballance.add_floor", text=item, icon_value = config.blenderIcon_floor_dict[item])
+        for item in UTILS_constants.floor_derivedBlockList:
+            cop = layout.operator(
+                OBJS_add_floors.BALLANCE_OT_add_floors.bl_idname, 
+                text=item, icon_value = UTILS_constants.icons_floorDict[item])
             cop.floor_type = item
 
 
-# ============================================= blender call system
+# ============================================= 
+# blender call system
 
 classes = (
-    preferences.BallanceBlenderPluginPreferences,
-    preferences.MyPropertyGroup,
+    UTILS_preferences.BallanceBlenderPluginPreferences,
+    UTILS_preferences.MyPropertyGroup,
     
-    bm_import_export.BALLANCE_OT_import_bm,
-    bm_import_export.BALLANCE_OT_export_bm,
-    rail_uv.BALLANCE_OT_rail_uv,
-    threedsmax_align.BALLANCE_OT_super_align,
-    no_uv_checker.BALLANCE_OT_no_uv_checker,
-    flatten_uv.BALLANCE_OT_flatten_uv,
+    BMFILE_import.BALLANCE_OT_import_bm,
+    BMFILE_export.BALLANCE_OT_export_bm,
+
+    MODS_rail_uv.BALLANCE_OT_rail_uv,
+    MODS_3dsmax_align.BALLANCE_OT_super_align,
+    MODS_flatten_uv.BALLANCE_OT_flatten_uv,
     BALLANCE_MT_ThreeDViewerMenu,
 
-    add_elements.BALLANCE_OT_add_elements,
-    add_elements.BALLANCE_OT_add_rail,
-    add_floor.BALLANCE_OT_add_floor,
+    OBJS_add_components.BALLANCE_OT_add_components,
+    OBJS_add_rails.BALLANCE_OT_add_rails,
+    OBJS_add_floors.BALLANCE_OT_add_floors,
     BALLANCE_MT_AddFloorMenu
 )
 
 def menu_func_bm_import(self, context):
-    self.layout.operator(bm_import_export.BALLANCE_OT_import_bm.bl_idname, text="Ballance Map (.bmx)")
+    self.layout.operator(BMFILE_import.BALLANCE_OT_import_bm.bl_idname, text="Ballance Map (.bmx)")
 def menu_func_bm_export(self, context):
-    self.layout.operator(bm_import_export.BALLANCE_OT_export_bm.bl_idname, text="Ballance Map (.bmx)")
+    self.layout.operator(BMFILE_export.BALLANCE_OT_export_bm.bl_idname, text="Ballance Map (.bmx)")
 def menu_func_ballance_3d(self, context):
     layout = self.layout
     layout.menu(BALLANCE_MT_ThreeDViewerMenu.bl_idname)
@@ -106,29 +129,37 @@ def menu_func_ballance_add(self, context):
     layout = self.layout
     layout.separator()
     layout.label(text="Ballance")
-    layout.operator_menu_enum("ballance.add_elements", "elements_type", icon='MESH_ICOSPHERE', text="Elements")
-    layout.operator("ballance.add_rail", icon='MESH_CIRCLE', text="Rail section")
+    layout.operator_menu_enum(
+        OBJS_add_components.BALLANCE_OT_add_components.bl_idname, 
+        "elements_type", icon='MESH_ICOSPHERE', text="Elements")
+    layout.operator(OBJS_add_rails.BALLANCE_OT_add_rails.bl_idname, icon='MESH_CIRCLE', text="Rail section")
     layout.menu(BALLANCE_MT_AddFloorMenu.bl_idname, icon='MESH_CUBE')
+def menu_func_ballance_rename(self, context):
+    layout = self.layout
+    layout.separator()
+    layout.label(text="Ballance")
+    layout.operator(NAMES_rename_via_group.BALLANCE_OT_rename_via_group.bl_idname, text="Rename via Group")
 
 def register():
     # we need init all icon first
     icon_path = os.path.join(os.path.dirname(__file__), "icons")
-    config.blenderIcon_floor = bpy.utils.previews.new()
-    for key, value in config.floor_block_dict.items():
+    UTILS_constants.icons_floor = bpy.utils.previews.new()
+    for key, value in UTILS_constants.floor_blockDict.items():
         blockIconName = "Ballance_FloorIcon_" + key
-        config.blenderIcon_floor.load(blockIconName, os.path.join(icon_path, "floor", value["BindingDisplayTexture"]), 'IMAGE')
-        config.blenderIcon_floor_dict[key] = config.blenderIcon_floor[blockIconName].icon_id
+        UTILS_constants.icons_floor.load(blockIconName, os.path.join(icon_path, "floor", value["BindingDisplayTexture"]), 'IMAGE')
+        UTILS_constants.icons_floorDict[key] = UTILS_constants.icons_floor[blockIconName].icon_id
 
     for cls in classes:
         bpy.utils.register_class(cls)
 
-    bpy.types.Scene.BallanceBlenderPluginProperty = bpy.props.PointerProperty(type=preferences.MyPropertyGroup)
+    bpy.types.Scene.BallanceBlenderPluginProperty = bpy.props.PointerProperty(type=UTILS_preferences.MyPropertyGroup)
         
     bpy.types.TOPBAR_MT_file_import.append(menu_func_bm_import)
     bpy.types.TOPBAR_MT_file_export.append(menu_func_bm_export)
 
     bpy.types.VIEW3D_HT_header.append(menu_func_ballance_3d)
     bpy.types.VIEW3D_MT_add.append(menu_func_ballance_add)
+    bpy.types.COLLECTION_MT_context_menu.append(menu_func_ballance_rename)
         
 def unregister():
     bpy.types.TOPBAR_MT_file_import.remove(menu_func_bm_import)
@@ -136,12 +167,13 @@ def unregister():
     
     bpy.types.VIEW3D_HT_header.remove(menu_func_ballance_3d)
     bpy.types.VIEW3D_MT_add.remove(menu_func_ballance_add)
+    bpy.types.COLLECTION_MT_context_menu.remove(menu_func_ballance_rename)
 
     for cls in classes:
         bpy.utils.unregister_class(cls)
 
     # we need uninstall all icon after all classes unregister
-    bpy.utils.previews.remove(config.blenderIcon_floor)
+    bpy.utils.previews.remove(UTILS_constants.icons_floor)
     
 if __name__=="__main__":
 	register()
\ No newline at end of file
diff --git a/ballance_blender_plugin/bm_import_export.py b/ballance_blender_plugin/bm_import_export.py
deleted file mode 100644
index b92207e..0000000
--- a/ballance_blender_plugin/bm_import_export.py
+++ /dev/null
@@ -1,907 +0,0 @@
-import bpy,bmesh,bpy_extras,mathutils
-import pathlib,zipfile,time,os,tempfile,math
-import struct,shutil
-from bpy_extras import io_utils,node_shader_utils
-from bpy_extras.io_utils import unpack_list
-from bpy_extras.image_utils import load_image
-from . import utils, config
-
-class BALLANCE_OT_import_bm(bpy.types.Operator, bpy_extras.io_utils.ImportHelper):
-    """Load a Ballance Map File (BM file spec 1.3)"""
-    bl_idname = "ballance.import_bm"
-    bl_label = "Import BM "
-    bl_options = {'PRESET', 'UNDO'}
-    filename_ext = ".bmx"
-
-    texture_conflict_strategy: bpy.props.EnumProperty(
-        name="Texture name conflict",
-        items=(('NEW', "New instance", "Create a new instance"),
-               ('CURRENT', "Use current", "Use current"),),
-        description="Define how to process texture name conflict",
-        default='CURRENT',
-        )
-
-    material_conflict_strategy: bpy.props.EnumProperty(
-        name="Material name conflict",
-        items=(('RENAME', "Rename", "Rename the new one"),
-               ('CURRENT', "Use current", "Use current"),),
-        description="Define how to process material name conflict",
-        default='RENAME',
-        )
-
-    mesh_conflict_strategy: bpy.props.EnumProperty(
-        name="Mesh name conflict",
-        items=(('RENAME', "Rename", "Rename the new one"),
-               ('CURRENT', "Use current", "Use current"),),
-        description="Define how to process mesh name conflict",
-        default='RENAME',
-        )
-
-    object_conflict_strategy: bpy.props.EnumProperty(
-        name="Object name conflict",
-        items=(('RENAME', "Rename", "Rename the new one"),
-               ('CURRENT', "Use current", "Use current"),),
-        description="Define how to process object name conflict",
-        default='RENAME',
-        )
-
-    @classmethod
-    def poll(self, context):
-        prefs = bpy.context.preferences.addons[__package__].preferences
-        return (os.path.isdir(prefs.temp_texture_folder) and os.path.isdir(prefs.external_folder))
-
-    def execute(self, context):
-        prefs = bpy.context.preferences.addons[__package__].preferences
-        import_bm(context, self.filepath, prefs.external_folder, prefs.temp_texture_folder,
-        self.texture_conflict_strategy, self.material_conflict_strategy, self.mesh_conflict_strategy, self.object_conflict_strategy)
-        return {'FINISHED'}
-        
-class BALLANCE_OT_export_bm(bpy.types.Operator, bpy_extras.io_utils.ExportHelper):
-    """Save a Ballance Map File (BM file spec 1.3)"""
-    bl_idname = "ballance.export_bm"
-    bl_label = 'Export BM'
-    bl_options = {'PRESET'}
-    filename_ext = ".bmx"
-    
-    export_mode: bpy.props.EnumProperty(
-        name="Export mode",
-        items=(('COLLECTION', "Collection", "Export a collection"),
-               ('OBJECT', "Objects", "Export an objects"),
-               ),
-        )
-
-    def execute(self, context):
-        if (self.export_mode == 'COLLECTION' and context.scene.BallanceBlenderPluginProperty.collection_picker is None) or (self.export_mode == 'OBJECT' and context.scene.BallanceBlenderPluginProperty.object_picker is None):
-            utils.ShowMessageBox(("No specific target", ), "Lost parameter", 'ERROR')
-        else:
-            if self.export_mode == 'COLLECTION':
-                export_bm(context, self.filepath, self.export_mode, context.scene.BallanceBlenderPluginProperty.collection_picker)
-            elif self.export_mode == 'OBJECT':
-                export_bm(context, self.filepath, self.export_mode, context.scene.BallanceBlenderPluginProperty.object_picker)
-        return {'FINISHED'}
-
-    def draw(self, context):
-        layout = self.layout
-        layout.prop(self, "export_mode")
-        if self.export_mode == 'COLLECTION':
-            layout.prop(context.scene.BallanceBlenderPluginProperty, "collection_picker")
-        elif self.export_mode == 'OBJECT':
-            layout.prop(context.scene.BallanceBlenderPluginProperty, "object_picker")
-
-# ========================================== method
-
-bm_current_version = 13
-
-def import_bm(context,filepath,externalTexture,blenderTempFolder, textureOpt, materialOpt, meshOpt, objectOpt):
-    # ============================================ alloc a temp folder
-    tempFolderObj = tempfile.TemporaryDirectory()
-    tempFolder = tempFolderObj.name
-    # debug
-    # print(tempFolder)
-    tempTextureFolder = os.path.join(tempFolder, "Texture")
-    prefs = bpy.context.preferences.addons[__package__].preferences
-    blenderTempTextureFolder = prefs.temp_texture_folder
-    externalTextureFolder = prefs.external_folder
-
-    with zipfile.ZipFile(filepath, 'r', zipfile.ZIP_DEFLATED, 9) as zipObj:
-        zipObj.extractall(tempFolder)
-
-    # index.bm
-    objectList = []
-    meshList = []
-    materialList = []
-    textureList = []
-    with open(os.path.join(tempFolder, "index.bm"), "rb") as findex:
-        # judge version first
-        gotten_version = read_uint32(findex)
-        if (gotten_version != bm_current_version):
-            utils.ShowMessageBox(("Unsupported BM spec. Expect: {} Gotten: {}".format(bm_current_version, gotten_version), ), "Unsupported BM spec", 'ERROR')
-            findex.close()
-            tempFolderObj.cleanup()
-            return
-
-        while len(peek_stream(findex)) != 0:
-            index_name = read_string(findex)
-            index_type = read_uint8(findex)
-            index_offset = read_uint64(findex)
-            blockCache = info_block_helper(index_name, index_offset)
-            if index_type == info_bm_type.OBJECT:
-                objectList.append(blockCache)
-            elif index_type == info_bm_type.MESH:
-                meshList.append(blockCache)
-            elif index_type == info_bm_type.MATERIAL:
-                materialList.append(blockCache)
-            elif index_type == info_bm_type.TEXTURE:
-                textureList.append(blockCache)
-            else:
-                pass
-
-
-    # texture.bm
-    with open(os.path.join(tempFolder, "texture.bm"), "rb") as ftexture:
-        for item in textureList:
-            ftexture.seek(item.offset, os.SEEK_SET)
-            texture_filename = read_string(ftexture)
-            texture_isExternal = read_bool(ftexture)
-            if texture_isExternal:
-                txur = load_image(texture_filename, externalTextureFolder, check_existing=(textureOpt == 'CURRENT'))
-                item.blenderData = txur
-            else:
-                # not external. copy temp file into blender temp. then use it.
-                # try copy. if fail, don't need to do more
-                try:
-                    shutil.copy(os.path.join(tempTextureFolder, texture_filename), os.path.join(blenderTempTextureFolder, texture_filename))
-                except:
-                    pass
-                txur = load_image(texture_filename, blenderTempTextureFolder, check_existing=(textureOpt == 'CURRENT'))
-                item.blenderData = txur
-            txur.name = item.name
-
-    # material.bm
-    # WARNING: this code is shared with add_floor - create_or_get_material()
-    with open(os.path.join(tempFolder, "material.bm"), "rb") as fmaterial:
-        for item in materialList:
-            fmaterial.seek(item.offset, os.SEEK_SET)
-
-            # read data
-            material_colAmbient = read_3vector(fmaterial)
-            material_colDiffuse = read_3vector(fmaterial)
-            material_colSpecular = read_3vector(fmaterial)
-            material_colEmissive = read_3vector(fmaterial)
-            material_specularPower = read_float(fmaterial)
-            material_useTexture = read_bool(fmaterial)
-            material_texture = read_uint32(fmaterial)
-
-            # create basic material
-            (m, needSkip) = createInstanceWithOption(info_bm_type.MATERIAL, item.name, materialOpt)
-            item.blenderData = m
-            if needSkip:
-                continue
-                
-            m.use_nodes=True
-            for node in m.node_tree.nodes:
-                m.node_tree.nodes.remove(node)
-            bnode=m.node_tree.nodes.new(type="ShaderNodeBsdfPrincipled")
-            mnode=m.node_tree.nodes.new(type="ShaderNodeOutputMaterial")
-            m.node_tree.links.new(bnode.outputs[0],mnode.inputs[0])
-
-            m.metallic = sum(material_colAmbient) / 3
-            m.diffuse_color = [i for i in material_colDiffuse] + [1]
-            m.specular_color = material_colSpecular
-            m.specular_intensity = material_specularPower
-
-            # create a texture
-            if material_useTexture:
-                inode=m.node_tree.nodes.new(type="ShaderNodeTexImage")
-                inode.image=textureList[material_texture].blenderData
-                m.node_tree.links.new(inode.outputs[0],bnode.inputs[0])
-
-            # write custom property
-            m['virtools-ambient'] = material_colAmbient
-            m['virtools-diffuse'] = material_colDiffuse
-            m['virtools-specular'] = material_colSpecular
-            m['virtools-emissive'] = material_colEmissive
-            m['virtools-power'] = material_specularPower
-
-
-    # mesh.bm
-    # WARNING: this code is shared with add_floor
-    with open(os.path.join(tempFolder, "mesh.bm"), "rb") as fmesh:
-        vList=[]
-        vtList=[]
-        vnList=[]
-        faceList=[]
-        materialSolt = []
-        for item in meshList:
-            fmesh.seek(item.offset, os.SEEK_SET)
-
-            # create real mesh
-            (mesh, needSkip) = createInstanceWithOption(info_bm_type.MESH, item.name, meshOpt)
-            item.blenderData = mesh
-            if needSkip:
-                continue
-
-            vList.clear()
-            vtList.clear()
-            vnList.clear()
-            faceList.clear()
-            materialSolt.clear()
-            # in first read, store all data into list
-            listCount = read_uint32(fmesh)
-            for i in range(listCount):
-                cache = read_3vector(fmesh)
-                # switch yz
-                vList.append((cache[0], cache[2], cache[1]))
-            listCount = read_uint32(fmesh)
-            for i in range(listCount):
-                cache = read_2vector(fmesh)
-                # reverse v
-                vtList.append((cache[0], -cache[1]))
-            listCount = read_uint32(fmesh)
-            for i in range(listCount):
-                cache = read_3vector(fmesh)
-                # switch yz
-                vnList.append((cache[0], cache[2], cache[1]))
-            
-            listCount = read_uint32(fmesh)
-            for i in range(listCount):
-                faceData = read_face(fmesh)
-                mesh_useMaterial = read_bool(fmesh)
-                mesh_materialIndex = read_uint32(fmesh)
-
-                if mesh_useMaterial:
-                    neededMaterial = materialList[mesh_materialIndex].blenderData
-                    if neededMaterial in materialSolt:
-                        neededIndex = materialSolt.index(neededMaterial)
-                    else:
-                        neededIndex = len(materialSolt)
-                        materialSolt.append(neededMaterial)
-                else:
-                    neededIndex = -1
-
-                # we need invert triangle sort
-                faceList.append((
-                    faceData[6], faceData[7], faceData[8],
-                    faceData[3], faceData[4], faceData[5],
-                    faceData[0], faceData[1], faceData[2],
-                    neededIndex
-                ))
-
-            # and then we need add material solt for this mesh
-            for mat in materialSolt:
-                mesh.materials.append(mat)
-
-            # then, we need add correspond count for vertices
-            mesh.vertices.add(len(vList))
-            mesh.loops.add(len(faceList)*3)  # triangle face confirm
-            mesh.polygons.add(len(faceList))
-            mesh.uv_layers.new(do_init=False)
-            mesh.create_normals_split()
-
-            # add vertices data
-            mesh.vertices.foreach_set("co", unpack_list(vList))
-            mesh.loops.foreach_set("vertex_index", unpack_list(flat_vertices_index(faceList)))
-            mesh.loops.foreach_set("normal", unpack_list(flat_vertices_normal(faceList, vnList)))
-            mesh.uv_layers[0].data.foreach_set("uv", unpack_list(flat_vertices_uv(faceList, vtList)))
-            for i in range(len(faceList)):
-                mesh.polygons[i].loop_start = i * 3
-                mesh.polygons[i].loop_total = 3
-                if faceList[i][9] != -1:
-                    mesh.polygons[i].material_index = faceList[i][9]
-
-                mesh.polygons[i].use_smooth = True
-            
-            mesh.validate(clean_customdata=False)
-            mesh.update(calc_edges=False, calc_edges_loose=False)
-            
-
-    # object
-    with open(os.path.join(tempFolder, "object.bm"), "rb") as fobject:
-
-        # we need get needed collection first
-        view_layer = context.view_layer
-        collection = view_layer.active_layer_collection.collection
-        if prefs.no_component_collection == "":
-            forcedCollection = None
-        else:
-            try:
-                forcedCollection = bpy.data.collections[prefs.no_component_collection]
-            except:
-                forcedCollection = bpy.data.collections.new(prefs.no_component_collection)
-                view_layer.active_layer_collection.collection.children.link(forcedCollection)
-
-        # start process it
-        object_groupList = []
-        for item in objectList:
-            fobject.seek(item.offset, os.SEEK_SET)
-
-            # read data
-            object_isComponent = read_bool(fobject)
-            object_isForcedNoComponent = read_bool(fobject)
-            object_isHidden = read_bool(fobject)
-            object_worldMatrix = read_worldMaterix(fobject)
-            object_groupListCount = read_uint32(fobject)
-            object_groupList.clear()
-            for i in range(object_groupListCount):
-                object_groupList.append(read_string(fobject))
-            object_meshIndex = read_uint32(fobject)
-
-            # got mesh first
-            if object_isComponent:
-                neededMesh = load_component(object_meshIndex)
-            else:
-                neededMesh = meshList[object_meshIndex].blenderData
-
-            # create real object
-            (obj, needSkip) = createInstanceWithOption(info_bm_type.OBJECT, item.name, objectOpt, extraMesh=neededMesh)
-            if needSkip:
-                continue
-            if (not object_isComponent) and object_isForcedNoComponent and (forcedCollection is not None):
-                forcedCollection.objects.link(obj)
-            else:
-                collection.objects.link(obj)
-            obj.matrix_world = object_worldMatrix
-            obj.hide_set(object_isHidden)
-
-            # write custom property
-            if len(object_groupList) != 0:
-                obj['virtools-group'] = tuple(object_groupList)
-
-    view_layer.update()
-
-    tempFolderObj.cleanup()
-    
-def export_bm(context, filepath, export_mode, export_target):
-    # ============================================ alloc a temp folder
-    tempFolderObj = tempfile.TemporaryDirectory()
-    tempFolder = tempFolderObj.name
-    # debug
-    # tempFolder = "G:\\ziptest"
-    tempTextureFolder = os.path.join(tempFolder, "Texture")
-    os.makedirs(tempTextureFolder)
-    prefs = bpy.context.preferences.addons[__package__].preferences
-    
-    # ============================================ find export target. don't need judge them in there. just collect them
-    if export_mode== "COLLECTION":
-        objectList = export_target.objects
-    else:
-        objectList = [export_target]
-
-    # try get forcedCollection
-    try:
-        forcedCollection = bpy.data.collections[prefs.no_component_collection]
-    except:
-        forcedCollection = None
-   
-    # ============================================ export
-    with open(os.path.join(tempFolder, "index.bm"), "wb") as finfo:
-        write_uint32(finfo, bm_current_version)
-        
-        # ====================== export object
-        meshSet = set()
-        meshList = []
-        meshCount = 0        
-        with open(os.path.join(tempFolder, "object.bm"), "wb") as fobject:
-            for obj in objectList:
-                # only export mesh object
-                if obj.type != 'MESH':
-                    continue
-
-                # clean no mesh object
-                currentMesh = obj.data
-                if currentMesh is None:
-                    continue
-
-                # judge component
-                object_isComponent = is_component(obj.name)
-                object_isForcedNoComponent = False
-                if (forcedCollection is not None) and (obj.name in forcedCollection.objects):
-                    # change it to forced no component
-                    object_isComponent = False
-                    object_isForcedNoComponent = True
-
-                # triangle first and then group
-                if not object_isComponent:
-                    if currentMesh not in meshSet:
-                        mesh_triangulate(currentMesh)
-                        meshSet.add(currentMesh)
-                        meshList.append(currentMesh)
-                        meshId = meshCount
-                        meshCount += 1
-                    else:
-                        meshId = meshList.index(currentMesh)
-                else:
-                    meshId = get_component_id(obj.name)
-
-                # get visibility
-                object_isHidden = not obj.visible_get()
-
-                # try get grouping data
-                object_groupList = try_get_custom_property(obj, 'virtools-group')
-                object_groupList = set_value_when_none(object_groupList, [])
-
-                # write finfo first
-                write_string(finfo, obj.name)
-                write_uint8(finfo, info_bm_type.OBJECT)
-                write_uint64(finfo, fobject.tell())
-
-                # write fobject
-                write_bool(fobject, object_isComponent)
-                write_bool(fobject, object_isForcedNoComponent)
-                write_bool(fobject, object_isHidden)
-                write_worldMatrix(fobject, obj.matrix_world)
-                write_uint32(fobject, len(object_groupList))
-                for item in object_groupList:
-                    write_string(fobject, item)
-                write_uint32(fobject, meshId)
-
-        # ====================== export mesh
-        materialSet = set()
-        materialList = []        
-        with open(os.path.join(tempFolder, "mesh.bm"), "wb") as fmesh:
-            for mesh in meshList:
-                mesh.calc_normals_split()
-
-                # write finfo first
-                write_string(finfo, mesh.name)
-                write_uint8(finfo, info_bm_type.MESH)
-                write_uint64(finfo, fmesh.tell())
-
-                # write fmesh
-                # vertices
-                vecList = mesh.vertices[:]
-                write_uint32(fmesh, len(vecList))
-                for vec in vecList:
-                    #swap yz
-                    write_3vector(fmesh,vec.co[0],vec.co[2],vec.co[1])
-
-                # uv
-                face_index_pairs = [(face, index) for index, face in enumerate(mesh.polygons)]
-                write_uint32(fmesh, len(face_index_pairs) * 3)
-                if mesh.uv_layers.active is not None:
-                    uv_layer = mesh.uv_layers.active.data[:]
-                    for f, f_index in face_index_pairs:
-                        # it should be triangle face, otherwise throw a error
-                        if (f.loop_total != 3):
-                            raise Exception("Not a triangle", f.poly.loop_total)
-
-                        for loop_index in range(f.loop_start, f.loop_start + f.loop_total):
-                            uv = uv_layer[loop_index].uv
-                            # reverse v
-                            write_2vector(fmesh, uv[0], -uv[1])
-                else:
-                    # no uv data. write garbage
-                    for i in range(len(face_index_pairs) * 3):
-                        write_2vector(fmesh, 0.0, 0.0)
-
-                # normals
-                write_uint32(fmesh, len(face_index_pairs) * 3)
-                for f, f_index in face_index_pairs:
-                    # no need to check triangle again
-                    for loop_index in range(f.loop_start, f.loop_start + f.loop_total):
-                        nml = mesh.loops[loop_index].normal
-                        # swap yz
-                        write_3vector(fmesh, nml[0], nml[2], nml[1])
-
-                # face
-                # get material first
-                currentMat = mesh.materials[:]
-                noMaterial = len(currentMat) == 0
-                for mat in currentMat:
-                    if mat not in materialSet:
-                        materialSet.add(mat)
-                        materialList.append(mat)
-
-                write_uint32(fmesh, len(face_index_pairs))
-                vtIndex = []
-                vnIndex = []
-                vIndex = []
-                for f, f_index in face_index_pairs:
-                    # confirm material use
-                    if noMaterial:
-                        usedMat = 0
-                    else:
-                        usedMat = materialList.index(currentMat[f.material_index])
-
-                    # export face
-                    vtIndex.clear()
-                    vnIndex.clear()
-                    vIndex.clear()
-
-                    counter = 0
-                    for loop_index in range(f.loop_start, f.loop_start + f.loop_total):
-                        vIndex.append(mesh.loops[loop_index].vertex_index)
-                        vnIndex.append(f_index * 3 + counter)
-                        vtIndex.append(f_index * 3 + counter)
-                        counter += 1
-                    # reverse vertices sort
-                    write_face(fmesh,
-                    vIndex[2], vtIndex[2], vnIndex[2],
-                    vIndex[1], vtIndex[1], vnIndex[1],
-                    vIndex[0], vtIndex[0], vnIndex[0])
-
-                    # set used material
-                    write_bool(fmesh, not noMaterial)
-                    write_uint32(fmesh, usedMat)
-
-                mesh.free_normals_split()
-
-        # ====================== export material
-        textureSet = set()
-        textureList = []
-        textureCount = 0        
-        with open(os.path.join(tempFolder, "material.bm"), "wb") as fmaterial:
-            for material in materialList:
-                # write finfo first
-                write_string(finfo, material.name)
-                write_uint8(finfo, info_bm_type.MATERIAL)
-                write_uint64(finfo, fmaterial.tell())
-
-                # try get original written data
-                material_colAmbient = try_get_custom_property(material, 'virtools-ambient')
-                material_colDiffuse = try_get_custom_property(material, 'virtools-diffuse')
-                material_colSpecular = try_get_custom_property(material, 'virtools-specular')
-                material_colEmissive = try_get_custom_property(material, 'virtools-emissive')
-                material_specularPower = try_get_custom_property(material, 'virtools-power')
-
-                # get basic color
-                mat_wrap = node_shader_utils.PrincipledBSDFWrapper(material)
-                if mat_wrap:
-                    use_mirror = mat_wrap.metallic != 0.0
-                    if use_mirror:
-                        material_colAmbient = set_value_when_none(material_colAmbient, (mat_wrap.metallic, mat_wrap.metallic, mat_wrap.metallic))
-                    else:
-                        material_colAmbient = set_value_when_none(material_colAmbient, (1.0, 1.0, 1.0))
-                    material_colDiffuse = set_value_when_none(material_colDiffuse, (mat_wrap.base_color[0], mat_wrap.base_color[1], mat_wrap.base_color[2]))
-                    material_colSpecular = set_value_when_none(material_colSpecular, (mat_wrap.specular, mat_wrap.specular, mat_wrap.specular))
-                    material_colEmissive = set_value_when_none(material_colEmissive, mat_wrap.emission_color[:3])
-                    material_specularPower = set_value_when_none(material_specularPower, 0.0)
-
-                    # confirm texture
-                    tex_wrap = getattr(mat_wrap, "base_color_texture", None)
-                    if tex_wrap:
-                        image = tex_wrap.image
-                        if image:
-                            # add into texture list
-                            if image not in textureSet:
-                                textureSet.add(image)
-                                textureList.append(image)
-                                currentTexture = textureCount
-                                textureCount += 1
-                            else:
-                                currentTexture = textureList.index(image)
-
-                            material_useTexture = True
-                            material_texture = currentTexture
-                        else:
-                            # no texture
-                            material_useTexture = False
-                            material_texture = 0
-                    else:
-                        # no texture
-                        material_useTexture = False
-                        material_texture = 0
-
-                else:
-                    # no Principled BSDF. write garbage
-                    material_colAmbient = set_value_when_none(material_colAmbient, (0.8, 0.8, 0.8))
-                    material_colDiffuse = set_value_when_none(material_colDiffuse, (0.8, 0.8, 0.8))
-                    material_colSpecular = set_value_when_none(material_colSpecular, (0.8, 0.8, 0.8))
-                    material_colEmissive = set_value_when_none(material_colEmissive, (0.8, 0.8, 0.8))
-                    material_specularPower = set_value_when_none(material_specularPower, 0.0)
-
-                    material_useTexture = False
-                    material_texture = 0
-
-                write_color(fmaterial, material_colAmbient)
-                write_color(fmaterial, material_colDiffuse)
-                write_color(fmaterial, material_colSpecular)
-                write_color(fmaterial, material_colEmissive)
-                write_float(fmaterial, material_specularPower)
-                write_bool(fmaterial, material_useTexture)
-                write_uint32(fmaterial, material_texture)
-            
-
-        # ====================== export texture
-        source_dir = os.path.dirname(bpy.data.filepath)
-        existed_texture = set()        
-        with open(os.path.join(tempFolder, "texture.bm"), "wb") as ftexture:
-            for texture in textureList:
-                # write finfo first
-                write_string(finfo, texture.name)
-                write_uint8(finfo, info_bm_type.TEXTURE)
-                write_uint64(finfo, ftexture.tell())
-
-                # confirm internal
-                texture_filepath = io_utils.path_reference(texture.filepath, source_dir, tempTextureFolder,
-                                                            'ABSOLUTE', "", None, texture.library)
-                filename = os.path.basename(texture_filepath)
-                write_string(ftexture, filename)
-                if (is_external_texture(filename)):
-                    write_bool(ftexture, True)
-                else:
-                    # copy internal texture, if this file is copied, do not copy it again
-                    write_bool(ftexture, False)
-                    if filename not in existed_texture:
-                        shutil.copy(texture_filepath, os.path.join(tempTextureFolder, filename))
-                        existed_texture.add(filename)
-
-
-    # ============================================ save zip and clean up folder
-    if os.path.isfile(filepath):
-        os.remove(filepath)
-    with zipfile.ZipFile(filepath, 'w', zipfile.ZIP_DEFLATED, 9) as zipObj:
-       for folderName, subfolders, filenames in os.walk(tempFolder):
-           for filename in filenames:
-               filePath = os.path.join(folderName, filename)
-               arcname=os.path.relpath(filePath, tempFolder)
-               zipObj.write(filePath, arcname)
-    tempFolderObj.cleanup()
-
-# ======================================================================================= export / import assistant
-
-# shared
-
-class info_bm_type():
-    OBJECT = 0
-    MESH = 1
-    MATERIAL = 2
-    TEXTURE = 3
-
-# import
-
-class info_block_helper():
-    def __init__(self, name, offset):
-        self.name = name
-        self.offset = offset
-        self.blenderData = None
-
-def createInstanceWithOption(instType, instName, instOpt, extraMesh = None):
-    if instType == info_bm_type.OBJECT:
-        target = bpy.data.objects
-        args = (instName, extraMesh)
-    elif instType == info_bm_type.MESH:
-        target = bpy.data.meshes
-        args = (instName, )
-    elif instType == info_bm_type.MATERIAL:
-        target = bpy.data.materials
-        args = (instName, )
-
-    if instOpt == 'RENAME':
-        tempInst = target.new(*args)
-        tempSkip = False
-    elif instOpt == 'CURRENT':
-        try:
-            tempInst = target[instName]
-            tempSkip = True
-        except:
-            tempInst = target.new(*args)
-            tempSkip = False
-
-    return (tempInst, tempSkip)
-
-# NOTE: this function also used by add_elements.py
-def load_component(component_id):
-    # get file first
-    compName = config.component_list[component_id]
-    selectedFile = os.path.join(
-        os.path.dirname(__file__),
-        'meshes',
-        compName + '.bin'
-    )
-
-    # read file. please note this sector is sync with import_bm's mesh's code. when something change, please change each other.
-    fmesh = open(selectedFile, 'rb')
-
-    # create real mesh, we don't need to consider name. blender will solve duplicated name
-    mesh = bpy.data.meshes.new('mesh_' + compName)
-
-    vList = []
-    vnList = []
-    faceList = []
-    # in first read, store all data into list
-    listCount = read_uint32(fmesh)
-    for i in range(listCount):
-        cache = read_3vector(fmesh)
-        # switch yz
-        vList.append((cache[0], cache[2], cache[1]))
-    listCount = read_uint32(fmesh)
-    for i in range(listCount):
-        cache = read_3vector(fmesh)
-        # switch yz
-        vnList.append((cache[0], cache[2], cache[1]))
-    
-    listCount = read_uint32(fmesh)
-    for i in range(listCount):
-        faceData = read_component_face(fmesh)
-
-        # we need invert triangle sort
-        faceList.append((
-            faceData[4], faceData[5],
-            faceData[2], faceData[3],
-            faceData[0], faceData[1]
-        ))
-
-    # then, we need add correspond count for vertices
-    mesh.vertices.add(len(vList))
-    mesh.loops.add(len(faceList)*3)  # triangle face confirm
-    mesh.polygons.add(len(faceList))
-    mesh.create_normals_split()
-
-    # add vertices data
-    mesh.vertices.foreach_set("co", unpack_list(vList))
-    mesh.loops.foreach_set("vertex_index", unpack_list(flat_component_vertices_index(faceList)))
-    mesh.loops.foreach_set("normal", unpack_list(flat_component_vertices_normal(faceList, vnList)))
-    for i in range(len(faceList)):
-        mesh.polygons[i].loop_start = i * 3
-        mesh.polygons[i].loop_total = 3
-
-        mesh.polygons[i].use_smooth = True
-    
-    mesh.validate(clean_customdata=False)
-    mesh.update(calc_edges=False, calc_edges_loose=False)
-
-    fmesh.close()
-
-    return mesh
-
-def flat_vertices_index(faceList):
-    for item in faceList:
-        yield (item[0], )
-        yield (item[3], )
-        yield (item[6], )
-
-def flat_vertices_normal(faceList, vnList):
-    for item in faceList:
-        yield vnList[item[2]]
-        yield vnList[item[5]]
-        yield vnList[item[8]]
-
-def flat_vertices_uv(faceList, vtList):
-    for item in faceList:
-        yield vtList[item[1]]
-        yield vtList[item[4]]
-        yield vtList[item[7]]
-
-def flat_component_vertices_index(faceList):
-    for item in faceList:
-        yield (item[0], )
-        yield (item[2], )
-        yield (item[4], )
-
-def flat_component_vertices_normal(faceList, vnList):
-    for item in faceList:
-        yield vnList[item[1]]
-        yield vnList[item[3]]
-        yield vnList[item[5]]
-
-# export
-
-def is_component(name):
-    return get_component_id(name) != -1
-
-def get_component_id(name):
-    for ind, comp in enumerate(config.component_list):
-        if name.startswith(comp):
-            return ind
-    return -1
-
-def is_external_texture(name):
-    if name in config.external_texture_list:
-        return True
-    else:
-        return False
-
-def mesh_triangulate(me):
-    bm = bmesh.new()
-    bm.from_mesh(me)
-    bmesh.ops.triangulate(bm, faces=bm.faces)
-    bm.to_mesh(me)
-    bm.free()
-
-def try_get_custom_property(obj, field):
-    try:
-        return obj[field]
-    except:
-        return None
-
-def set_value_when_none(obj, newValue):
-    if obj is None:
-        return newValue
-    else:
-        return obj
-
-# ======================================================================================= file io assistant
-
-# import
-
-def peek_stream(fs):
-    res = fs.read(1)
-    fs.seek(-1, os.SEEK_CUR)
-    return res
-
-def read_float(fs):
-    return struct.unpack("f", fs.read(4))[0]
-
-def read_uint8(fs):
-    return struct.unpack("B", fs.read(1))[0]
-
-def read_uint32(fs):
-    return struct.unpack("I", fs.read(4))[0]
-
-def read_uint64(fs):
-    return struct.unpack("Q", fs.read(8))[0]
-
-def read_string(fs):
-    count  = read_uint32(fs)
-    return fs.read(count*4).decode("utf_32_le")
-
-def read_bool(fs):
-    return read_uint8(fs) != 0
-
-def read_worldMaterix(fs):
-    p = struct.unpack("ffffffffffffffff", fs.read(4*4*4))
-    res = mathutils.Matrix((
-    (p[0], p[2], p[1], p[3]),
-    (p[8], p[10], p[9], p[11]),
-    (p[4], p[6], p[5], p[7]),
-    (p[12], p[14], p[13], p[15])))
-    return res.transposed()
-
-def read_3vector(fs):
-    return struct.unpack("fff", fs.read(3*4))
-
-def read_2vector(fs):
-    return struct.unpack("ff", fs.read(2*4))
-
-def read_face(fs):
-    return struct.unpack("IIIIIIIII", fs.read(4*9))
-
-def read_component_face(fs):
-    return struct.unpack("IIIIII", fs.read(4*6))
-
-# export
-
-def write_string(fs,str):
-    count=len(str)
-    write_uint32(fs,count)
-    fs.write(str.encode("utf_32_le"))
-
-def write_uint8(fs,num):
-    fs.write(struct.pack("B", num))
-
-def write_uint32(fs,num):
-    fs.write(struct.pack("I", num))
-
-def write_uint64(fs,num):
-    fs.write(struct.pack("Q", num))
-
-def write_bool(fs,boolean):
-    if boolean:
-        write_uint8(fs, 1)
-    else:
-        write_uint8(fs, 0)
-
-def write_float(fs,fl):
-    fs.write(struct.pack("f", fl))
-
-def write_worldMatrix(fs, matt):
-    mat = matt.transposed()
-    fs.write(struct.pack("ffffffffffffffff",
-    mat[0][0],mat[0][2], mat[0][1], mat[0][3],
-    mat[2][0],mat[2][2], mat[2][1], mat[2][3],
-    mat[1][0],mat[1][2], mat[1][1], mat[1][3],
-    mat[3][0],mat[3][2], mat[3][1], mat[3][3]))
-
-def write_3vector(fs, x, y ,z):
-    fs.write(struct.pack("fff", x, y ,z))
-
-def write_color(fs, colors):
-    write_3vector(fs, colors[0], colors[1], colors[2])
-
-def write_2vector(fs, u, v):
-    fs.write(struct.pack("ff", u, v))
-
-def write_face(fs, v1, vt1, vn1, v2, vt2, vn2, v3, vt3, vn3):
-    fs.write(struct.pack("IIIIIIIII", v1, vt1, vn1, v2, vt2, vn2, v3, vt3, vn3))
-
diff --git a/ballance_blender_plugin/no_uv_checker.py b/ballance_blender_plugin/no_uv_checker.py
deleted file mode 100644
index 9660e0e..0000000
--- a/ballance_blender_plugin/no_uv_checker.py
+++ /dev/null
@@ -1,48 +0,0 @@
-import bpy,bmesh
-from . import utils
-
-class BALLANCE_OT_no_uv_checker(bpy.types.Operator):
-    """Check whether the currently selected object has UV"""
-    bl_idname = "ballance.no_uv_checker"
-    bl_label = "Check UV"
-    bl_options = {'UNDO'}
-
-    @classmethod
-    def poll(self, context):
-        return check_valid_target()
-
-    def execute(self, context):
-        check_target()
-        return {'FINISHED'}
-
-# ====================== method
-
-def check_valid_target():
-    return (len(bpy.context.selected_objects) > 0)
-
-def check_target():
-    noUVObject = []
-    invalidObjectCount = 0
-    for obj in bpy.context.selected_objects:
-        if obj.type != 'MESH':
-            invalidObjectCount+=1
-            continue
-        if obj.mode != 'OBJECT':
-            invalidObjectCount+=1
-            continue
-        if obj.data.uv_layers.active is None:
-            noUVObject.append(obj.name)
-
-    if len(noUVObject) > 4:
-        print("Following object don't have UV:")
-        for item in noUVObject:
-            print(item)
-
-    utils.ShowMessageBox((
-        "All objects: {}".format(len(bpy.context.selected_objects)),
-        "Skipped: {}".format(invalidObjectCount),
-        "No UV Count: {}".format(len(noUVObject)),
-        "",
-        "Following object don't have UV: "
-    ) + tuple(noUVObject[:4]) + 
-    (("Too much objects don't have UV. Please open terminal to browse them." if len(noUVObject) > 4 else "") ,), "Check result", 'INFO')
diff --git a/ballance_blender_plugin/utils.py b/ballance_blender_plugin/utils.py
deleted file mode 100644
index a4aa152..0000000
--- a/ballance_blender_plugin/utils.py
+++ /dev/null
@@ -1,21 +0,0 @@
-import bpy
-from bpy_extras.io_utils import unpack_list
-
-def ShowMessageBox(message, title, icon):
-
-    def draw(self, context):
-        layout = self.layout
-        for item in message:
-            layout.label(text=item, translate=False)
-
-    bpy.context.window_manager.popup_menu(draw, title = title, icon = icon)
-
-def AddSceneAndMove2Cursor(obj):
-    Move2Cursor(obj)
-
-    view_layer = bpy.context.view_layer
-    collection = view_layer.active_layer_collection.collection
-    collection.objects.link(obj)
-
-def Move2Cursor(obj):
-    obj.location = bpy.context.scene.cursor.location