Magic UV: Release v6.0

Support Blender 2.8.

46 files changed, 13065 insertions, 0 deletions

diff --git a/magic_uv/__init__.py b/magic_uv/__init__.py
new file mode 100644
index 00000000..5bac5fd2
--- /dev/null
+++ b/magic_uv/__init__.py
@@ -0,0 +1,87 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+
+bl_info = {
+    "name": "Magic UV",
+    "author": "Nutti, Mifth, Jace Priester, kgeogeo, mem, imdjs"
+              "Keith (Wahooney) Boshoff, McBuff, MaxRobinot, "
+              "Alexander Milovsky",
+    "version": (6, 0, 0),
+    "blender": (2, 80, 0),
+    "location": "See Add-ons Preferences",
+    "description": "UV Toolset. See Add-ons Preferences for details",
+    "warning": "",
+    "support": "COMMUNITY",
+    "wiki_url": "https://wiki.blender.org/index.php/Extensions:2.6/"
+                "Py/Scripts/UV/Magic_UV",
+    "tracker_url": "https://github.com/nutti/Magic-UV",
+    "category": "UV"
+}
+
+
+if "bpy" in locals():
+    import importlib
+    importlib.reload(common)
+    importlib.reload(utils)
+    utils.bl_class_registry.BlClassRegistry.cleanup()
+    importlib.reload(op)
+    importlib.reload(ui)
+    importlib.reload(properites)
+    importlib.reload(preferences)
+    importlib.reload(updater)
+else:
+    import bpy
+    from . import common
+    from . import utils
+    from . import op
+    from . import ui
+    from . import properites
+    from . import preferences
+    from . import updater
+
+import bpy
+
+
+def register():
+    updater.register_updater(bl_info)
+
+    utils.bl_class_registry.BlClassRegistry.register()
+    properites.init_props(bpy.types.Scene)
+    user_prefs = utils.compatibility.get_user_preferences(bpy.context)
+    if user_prefs.addons['magic_uv'].preferences.enable_builtin_menu:
+        preferences.add_builtin_menu()
+
+
+def unregister():
+    user_prefs = utils.compatibility.get_user_preferences(bpy.context)
+    if user_prefs.addons['magic_uv'].preferences.enable_builtin_menu:
+        preferences.remove_builtin_menu()
+    properites.clear_props(bpy.types.Scene)
+    utils.bl_class_registry.BlClassRegistry.unregister()
+
+
+if __name__ == "__main__":
+    register()
diff --git a/magic_uv/common.py b/magic_uv/common.py
new file mode 100644
index 00000000..78a88308
--- /dev/null
+++ b/magic_uv/common.py
@@ -0,0 +1,1134 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+from collections import defaultdict
+from pprint import pprint
+from math import fabs, sqrt
+import os
+
+import bpy
+from mathutils import Vector
+import bmesh
+
+from .utils import compatibility as compat
+
+
+__DEBUG_MODE = False
+
+
+def is_console_mode():
+    if "MUV_CONSOLE_MODE" not in os.environ:
+        return False
+    return os.environ["MUV_CONSOLE_MODE"] == "True"
+
+
+def is_debug_mode():
+    return __DEBUG_MODE
+
+
+def enable_debugg_mode():
+    # pylint: disable=W0603
+    global __DEBUG_MODE
+    __DEBUG_MODE = True
+
+
+def disable_debug_mode():
+    # pylint: disable=W0603
+    global __DEBUG_MODE
+    __DEBUG_MODE = False
+
+
+def debug_print(*s):
+    """
+    Print message to console in debugging mode
+    """
+
+    if is_debug_mode():
+        pprint(s)
+
+
+def check_version(major, minor, _):
+    """
+    Check blender version
+    """
+
+    if bpy.app.version[0] == major and bpy.app.version[1] == minor:
+        return 0
+    if bpy.app.version[0] > major:
+        return 1
+    if bpy.app.version[1] > minor:
+        return 1
+    return -1
+
+
+def redraw_all_areas():
+    """
+    Redraw all areas
+    """
+
+    for area in bpy.context.screen.areas:
+        area.tag_redraw()
+
+
+def get_space(area_type, region_type, space_type):
+    """
+    Get current area/region/space
+    """
+
+    area = None
+    region = None
+    space = None
+
+    for area in bpy.context.screen.areas:
+        if area.type == area_type:
+            break
+    else:
+        return (None, None, None)
+    for region in area.regions:
+        if region.type == region_type:
+            if compat.check_version(2, 80, 0) >= 0:
+                if region.width <= 1 or region.height <= 1:
+                    continue
+            break
+    else:
+        return (area, None, None)
+    for space in area.spaces:
+        if space.type == space_type:
+            break
+    else:
+        return (area, region, None)
+
+    return (area, region, space)
+
+
+def mouse_on_region(event, area_type, region_type):
+    pos = Vector((event.mouse_x, event.mouse_y))
+
+    _, region, _ = get_space(area_type, region_type, "")
+    if region is None:
+        return False
+
+    if (pos.x > region.x) and (pos.x < region.x + region.width) and \
+       (pos.y > region.y) and (pos.y < region.y + region.height):
+        return True
+
+    return False
+
+
+def mouse_on_area(event, area_type):
+    pos = Vector((event.mouse_x, event.mouse_y))
+
+    area, _, _ = get_space(area_type, "", "")
+    if area is None:
+        return False
+
+    if (pos.x > area.x) and (pos.x < area.x + area.width) and \
+       (pos.y > area.y) and (pos.y < area.y + area.height):
+        return True
+
+    return False
+
+
+def mouse_on_regions(event, area_type, regions):
+    if not mouse_on_area(event, area_type):
+        return False
+
+    for region in regions:
+        result = mouse_on_region(event, area_type, region)
+        if result:
+            return True
+
+    return False
+
+
+def create_bmesh(obj):
+    bm = bmesh.from_edit_mesh(obj.data)
+    if check_version(2, 73, 0) >= 0:
+        bm.faces.ensure_lookup_table()
+
+    return bm
+
+
+def create_new_uv_map(obj, name=None):
+    uv_maps_old = {l.name for l in obj.data.uv_layers}
+    bpy.ops.mesh.uv_texture_add()
+    uv_maps_new = {l.name for l in obj.data.uv_layers}
+    diff = uv_maps_new - uv_maps_old
+
+    if not list(diff):
+        return None     # no more UV maps can not be created
+
+    # rename UV map
+    new = obj.data.uv_layers[list(diff)[0]]
+    if name:
+        new.name = name
+
+    return new
+
+
+def __get_island_info(uv_layer, islands):
+    """
+    get information about each island
+    """
+
+    island_info = []
+    for isl in islands:
+        info = {}
+        max_uv = Vector((-10000000.0, -10000000.0))
+        min_uv = Vector((10000000.0, 10000000.0))
+        ave_uv = Vector((0.0, 0.0))
+        num_uv = 0
+        for face in isl:
+            n = 0
+            a = Vector((0.0, 0.0))
+            ma = Vector((-10000000.0, -10000000.0))
+            mi = Vector((10000000.0, 10000000.0))
+            for l in face['face'].loops:
+                uv = l[uv_layer].uv
+                ma.x = max(uv.x, ma.x)
+                ma.y = max(uv.y, ma.y)
+                mi.x = min(uv.x, mi.x)
+                mi.y = min(uv.y, mi.y)
+                a = a + uv
+                n = n + 1
+            ave_uv = ave_uv + a
+            num_uv = num_uv + n
+            a = a / n
+            max_uv.x = max(ma.x, max_uv.x)
+            max_uv.y = max(ma.y, max_uv.y)
+            min_uv.x = min(mi.x, min_uv.x)
+            min_uv.y = min(mi.y, min_uv.y)
+            face['max_uv'] = ma
+            face['min_uv'] = mi
+            face['ave_uv'] = a
+        ave_uv = ave_uv / num_uv
+
+        info['center'] = ave_uv
+        info['size'] = max_uv - min_uv
+        info['num_uv'] = num_uv
+        info['group'] = -1
+        info['faces'] = isl
+        info['max'] = max_uv
+        info['min'] = min_uv
+
+        island_info.append(info)
+
+    return island_info
+
+
+def __parse_island(bm, face_idx, faces_left, island,
+                   face_to_verts, vert_to_faces):
+    """
+    Parse island
+    """
+
+    if face_idx in faces_left:
+        faces_left.remove(face_idx)
+        island.append({'face': bm.faces[face_idx]})
+        for v in face_to_verts[face_idx]:
+            connected_faces = vert_to_faces[v]
+            if connected_faces:
+                for cf in connected_faces:
+                    __parse_island(bm, cf, faces_left, island, face_to_verts,
+                                   vert_to_faces)
+
+
+def __get_island(bm, face_to_verts, vert_to_faces):
+    """
+    Get island list
+    """
+
+    uv_island_lists = []
+    faces_left = set(face_to_verts.keys())
+    while faces_left:
+        current_island = []
+        face_idx = list(faces_left)[0]
+        __parse_island(bm, face_idx, faces_left, current_island,
+                       face_to_verts, vert_to_faces)
+        uv_island_lists.append(current_island)
+
+    return uv_island_lists
+
+
+def __create_vert_face_db(faces, uv_layer):
+    # create mesh database for all faces
+    face_to_verts = defaultdict(set)
+    vert_to_faces = defaultdict(set)
+    for f in faces:
+        for l in f.loops:
+            id_ = l[uv_layer].uv.to_tuple(5), l.vert.index
+            face_to_verts[f.index].add(id_)
+            vert_to_faces[id_].add(f.index)
+
+    return (face_to_verts, vert_to_faces)
+
+
+def get_island_info(obj, only_selected=True):
+    bm = bmesh.from_edit_mesh(obj.data)
+    if check_version(2, 73, 0) >= 0:
+        bm.faces.ensure_lookup_table()
+
+    return get_island_info_from_bmesh(bm, only_selected)
+
+
+def get_island_info_from_bmesh(bm, only_selected=True):
+    if not bm.loops.layers.uv:
+        return None
+    uv_layer = bm.loops.layers.uv.verify()
+
+    # create database
+    if only_selected:
+        selected_faces = [f for f in bm.faces if f.select]
+    else:
+        selected_faces = [f for f in bm.faces]
+
+    return get_island_info_from_faces(bm, selected_faces, uv_layer)
+
+
+def get_island_info_from_faces(bm, faces, uv_layer):
+    ftv, vtf = __create_vert_face_db(faces, uv_layer)
+
+    # Get island information
+    uv_island_lists = __get_island(bm, ftv, vtf)
+    island_info = __get_island_info(uv_layer, uv_island_lists)
+
+    return island_info
+
+
+def get_uvimg_editor_board_size(area):
+    if area.spaces.active.image:
+        return area.spaces.active.image.size
+
+    return (255.0, 255.0)
+
+
+def calc_polygon_2d_area(points):
+    area = 0.0
+    for i, p1 in enumerate(points):
+        p2 = points[(i + 1) % len(points)]
+        v1 = p1 - points[0]
+        v2 = p2 - points[0]
+        a = v1.x * v2.y - v1.y * v2.x
+        area = area + a
+
+    return fabs(0.5 * area)
+
+
+def calc_polygon_3d_area(points):
+    area = 0.0
+    for i, p1 in enumerate(points):
+        p2 = points[(i + 1) % len(points)]
+        v1 = p1 - points[0]
+        v2 = p2 - points[0]
+        cx = v1.y * v2.z - v1.z * v2.y
+        cy = v1.z * v2.x - v1.x * v2.z
+        cz = v1.x * v2.y - v1.y * v2.x
+        a = sqrt(cx * cx + cy * cy + cz * cz)
+        area = area + a
+
+    return 0.5 * area
+
+
+def measure_mesh_area(obj):
+    bm = bmesh.from_edit_mesh(obj.data)
+    if check_version(2, 73, 0) >= 0:
+        bm.verts.ensure_lookup_table()
+        bm.edges.ensure_lookup_table()
+        bm.faces.ensure_lookup_table()
+
+    sel_faces = [f for f in bm.faces if f.select]
+
+    # measure
+    mesh_area = 0.0
+    for f in sel_faces:
+        verts = [l.vert.co for l in f.loops]
+        f_mesh_area = calc_polygon_3d_area(verts)
+        mesh_area = mesh_area + f_mesh_area
+
+    return mesh_area
+
+
+def find_texture_layer(bm):
+    if check_version(2, 80, 0) >= 0:
+        return None
+    if bm.faces.layers.tex is None:
+        return None
+
+    return bm.faces.layers.tex.verify()
+
+
+def find_texture_nodes(obj):
+    nodes = []
+    for mat in obj.material_slots:
+        if not mat.material.node_tree:
+            continue
+        for node in mat.material.node_tree.nodes:
+            tex_node_types = [
+                'TEX_ENVIRONMENT',
+                'TEX_IMAGE',
+            ]
+            if node.type not in tex_node_types:
+                continue
+            if not node.image:
+                continue
+            nodes.append(node)
+
+    return nodes
+
+
+def find_image(obj, face=None, tex_layer=None):
+    # try to find from texture_layer
+    img = None
+    if tex_layer and face:
+        img = face[tex_layer].image
+
+    # not found, then try to search from node
+    if not img:
+        nodes = find_texture_nodes(obj)
+        if len(nodes) >= 2:
+            raise RuntimeError("Find more than 2 texture nodes")
+        if len(nodes) == 1:
+            img = nodes[0].image
+
+    return img
+
+
+def measure_uv_area(obj, tex_size=None):
+    bm = bmesh.from_edit_mesh(obj.data)
+    if check_version(2, 73, 0) >= 0:
+        bm.verts.ensure_lookup_table()
+        bm.edges.ensure_lookup_table()
+        bm.faces.ensure_lookup_table()
+
+    if not bm.loops.layers.uv:
+        return None
+    uv_layer = bm.loops.layers.uv.verify()
+
+    tex_layer = find_texture_layer(bm)
+
+    sel_faces = [f for f in bm.faces if f.select]
+
+    # measure
+    uv_area = 0.0
+    for f in sel_faces:
+        uvs = [l[uv_layer].uv for l in f.loops]
+        f_uv_area = calc_polygon_2d_area(uvs)
+
+        # user specified
+        if tex_size:
+            uv_area = uv_area + f_uv_area * tex_size[0] * tex_size[1]
+            continue
+
+        img = find_image(obj, f, tex_layer)
+
+        # can not find from node, so we can not get texture size
+        if not img:
+            return None
+
+        img_size = img.size
+        uv_area = uv_area + f_uv_area * img_size[0] * img_size[1]
+
+    return uv_area
+
+
+def diff_point_to_segment(a, b, p):
+    ab = b - a
+    normal_ab = ab.normalized()
+
+    ap = p - a
+    dist_ax = normal_ab.dot(ap)
+
+    # cross point
+    x = a + normal_ab * dist_ax
+
+    # difference between cross point and point
+    xp = p - x
+
+    return xp, x
+
+
+# get selected loop pair whose loops are connected each other
+def __get_loop_pairs(l, uv_layer):
+
+    def __get_loop_pairs_internal(l_, pairs_, uv_layer_, parsed_):
+        parsed_.append(l_)
+        for ll in l_.vert.link_loops:
+            # forward direction
+            lln = ll.link_loop_next
+            # if there is same pair, skip it
+            found = False
+            for p in pairs_:
+                if (ll in p) and (lln in p):
+                    found = True
+                    break
+            # two loops must be selected
+            if ll[uv_layer_].select and lln[uv_layer_].select:
+                if not found:
+                    pairs_.append([ll, lln])
+                if lln not in parsed_:
+                    __get_loop_pairs_internal(lln, pairs_, uv_layer_, parsed_)
+
+            # backward direction
+            llp = ll.link_loop_prev
+            # if there is same pair, skip it
+            found = False
+            for p in pairs_:
+                if (ll in p) and (llp in p):
+                    found = True
+                    break
+            # two loops must be selected
+            if ll[uv_layer_].select and llp[uv_layer_].select:
+                if not found:
+                    pairs_.append([ll, llp])
+                if llp not in parsed_:
+                    __get_loop_pairs_internal(llp, pairs_, uv_layer_, parsed_)
+
+    pairs = []
+    parsed = []
+    __get_loop_pairs_internal(l, pairs, uv_layer, parsed)
+
+    return pairs
+
+
+# sort pair by vertex
+# (v0, v1) - (v1, v2) - (v2, v3) ....
+def __sort_loop_pairs(uv_layer, pairs, closed):
+    rest = pairs
+    sorted_pairs = [rest[0]]
+    rest.remove(rest[0])
+
+    # prepend
+    while True:
+        p1 = sorted_pairs[0]
+        for p2 in rest:
+            if p1[0].vert == p2[0].vert:
+                sorted_pairs.insert(0, [p2[1], p2[0]])
+                rest.remove(p2)
+                break
+            elif p1[0].vert == p2[1].vert:
+                sorted_pairs.insert(0, [p2[0], p2[1]])
+                rest.remove(p2)
+                break
+        else:
+            break
+
+    # append
+    while True:
+        p1 = sorted_pairs[-1]
+        for p2 in rest:
+            if p1[1].vert == p2[0].vert:
+                sorted_pairs.append([p2[0], p2[1]])
+                rest.remove(p2)
+                break
+            elif p1[1].vert == p2[1].vert:
+                sorted_pairs.append([p2[1], p2[0]])
+                rest.remove(p2)
+                break
+        else:
+            break
+
+    begin_vert = sorted_pairs[0][0].vert
+    end_vert = sorted_pairs[-1][-1].vert
+    if begin_vert != end_vert:
+        return sorted_pairs, ""
+    if closed and (begin_vert == end_vert):
+        # if the sequence of UV is circular, it is ok
+        return sorted_pairs, ""
+
+    # if the begin vertex and the end vertex are same, search the UVs which
+    # are separated each other
+    tmp_pairs = sorted_pairs
+    for i, (p1, p2) in enumerate(zip(tmp_pairs[:-1], tmp_pairs[1:])):
+        diff = p2[0][uv_layer].uv - p1[-1][uv_layer].uv
+        if diff.length > 0.000000001:
+            # UVs are separated
+            sorted_pairs = tmp_pairs[i + 1:]
+            sorted_pairs.extend(tmp_pairs[:i + 1])
+            break
+    else:
+        p1 = tmp_pairs[0]
+        p2 = tmp_pairs[-1]
+        diff = p2[-1][uv_layer].uv - p1[0][uv_layer].uv
+        if diff.length < 0.000000001:
+            # all UVs are not separated
+            return None, "All UVs are not separated"
+
+    return sorted_pairs, ""
+
+
+# get index of the island group which includes loop
+def __get_island_group_include_loop(loop, island_info):
+    for i, isl in enumerate(island_info):
+        for f in isl['faces']:
+            for l in f['face'].loops:
+                if l == loop:
+                    return i    # found
+
+    return -1   # not found
+
+
+# get index of the island group which includes pair.
+# if island group is not same between loops, it will be invalid
+def __get_island_group_include_pair(pair, island_info):
+    l1_grp = __get_island_group_include_loop(pair[0], island_info)
+    if l1_grp == -1:
+        return -1   # not found
+
+    for p in pair[1:]:
+        l2_grp = __get_island_group_include_loop(p, island_info)
+        if (l2_grp == -1) or (l1_grp != l2_grp):
+            return -1   # not found or invalid
+
+    return l1_grp
+
+
+# x ---- x   <- next_loop_pair
+# |      |
+# o ---- o   <- pair
+def __get_next_loop_pair(pair):
+    lp = pair[0].link_loop_prev
+    if lp.vert == pair[1].vert:
+        lp = pair[0].link_loop_next
+        if lp.vert == pair[1].vert:
+            # no loop is found
+            return None
+
+    ln = pair[1].link_loop_next
+    if ln.vert == pair[0].vert:
+        ln = pair[1].link_loop_prev
+        if ln.vert == pair[0].vert:
+            # no loop is found
+            return None
+
+    # tri-face
+    if lp == ln:
+        return [lp]
+
+    # quad-face
+    return [lp, ln]
+
+
+# | ---- |
+# % ---- %   <- next_poly_loop_pair
+# x ---- x   <- next_loop_pair
+# |      |
+# o ---- o   <- pair
+def __get_next_poly_loop_pair(pair):
+    v1 = pair[0].vert
+    v2 = pair[1].vert
+    for l1 in v1.link_loops:
+        if l1 == pair[0]:
+            continue
+        for l2 in v2.link_loops:
+            if l2 == pair[1]:
+                continue
+            if l1.link_loop_next == l2:
+                return [l1, l2]
+            elif l1.link_loop_prev == l2:
+                return [l1, l2]
+
+    # no next poly loop is found
+    return None
+
+
+# get loop sequence in the same island
+def __get_loop_sequence_internal(uv_layer, pairs, island_info, closed):
+    loop_sequences = []
+    for pair in pairs:
+        seqs = [pair]
+        p = pair
+        isl_grp = __get_island_group_include_pair(pair, island_info)
+        if isl_grp == -1:
+            return None, "Can not find the island or invalid island"
+
+        while True:
+            nlp = __get_next_loop_pair(p)
+            if not nlp:
+                break       # no more loop pair
+            nlp_isl_grp = __get_island_group_include_pair(nlp, island_info)
+            if nlp_isl_grp != isl_grp:
+                break       # another island
+            for nlpl in nlp:
+                if nlpl[uv_layer].select:
+                    return None, "Do not select UV which does not belong to " \
+                                 "the end edge"
+
+            seqs.append(nlp)
+
+            # when face is triangle, it indicates CLOSED
+            if (len(nlp) == 1) and closed:
+                break
+
+            nplp = __get_next_poly_loop_pair(nlp)
+            if not nplp:
+                break       # no more loop pair
+            nplp_isl_grp = __get_island_group_include_pair(nplp, island_info)
+            if nplp_isl_grp != isl_grp:
+                break       # another island
+
+            # check if the UVs are already parsed.
+            # this check is needed for the mesh which has the circular
+            # sequence of the vertices
+            matched = False
+            for p1 in seqs:
+                p2 = nplp
+                if ((p1[0] == p2[0]) and (p1[1] == p2[1])) or \
+                   ((p1[0] == p2[1]) and (p1[1] == p2[0])):
+                    matched = True
+            if matched:
+                debug_print("This is a circular sequence")
+                break
+
+            for nlpl in nplp:
+                if nlpl[uv_layer].select:
+                    return None, "Do not select UV which does not belong to " \
+                                 "the end edge"
+
+            seqs.append(nplp)
+
+            p = nplp
+
+        loop_sequences.append(seqs)
+    return loop_sequences, ""
+
+
+def get_loop_sequences(bm, uv_layer, closed=False):
+    sel_faces = [f for f in bm.faces if f.select]
+
+    # get candidate loops
+    cand_loops = []
+    for f in sel_faces:
+        for l in f.loops:
+            if l[uv_layer].select:
+                cand_loops.append(l)
+
+    if len(cand_loops) < 2:
+        return None, "More than 2 UVs must be selected"
+
+    first_loop = cand_loops[0]
+    isl_info = get_island_info_from_bmesh(bm, False)
+    loop_pairs = __get_loop_pairs(first_loop, uv_layer)
+    loop_pairs, err = __sort_loop_pairs(uv_layer, loop_pairs, closed)
+    if not loop_pairs:
+        return None, err
+    loop_seqs, err = __get_loop_sequence_internal(uv_layer, loop_pairs,
+                                                  isl_info, closed)
+    if not loop_seqs:
+        return None, err
+
+    return loop_seqs, ""
+
+
+def __is_segment_intersect(start1, end1, start2, end2):
+    seg1 = end1 - start1
+    seg2 = end2 - start2
+
+    a1 = -seg1.y
+    b1 = seg1.x
+    d1 = -(a1 * start1.x + b1 * start1.y)
+
+    a2 = -seg2.y
+    b2 = seg2.x
+    d2 = -(a2 * start2.x + b2 * start2.y)
+
+    seg1_line2_start = a2 * start1.x + b2 * start1.y + d2
+    seg1_line2_end = a2 * end1.x + b2 * end1.y + d2
+
+    seg2_line1_start = a1 * start2.x + b1 * start2.y + d1
+    seg2_line1_end = a1 * end2.x + b1 * end2.y + d1
+
+    if (seg1_line2_start * seg1_line2_end >= 0) or \
+            (seg2_line1_start * seg2_line1_end >= 0):
+        return False, None
+
+    u = seg1_line2_start / (seg1_line2_start - seg1_line2_end)
+    out = start1 + u * seg1
+
+    return True, out
+
+
+class RingBuffer:
+    def __init__(self, arr):
+        self.__buffer = arr.copy()
+        self.__pointer = 0
+
+    def __repr__(self):
+        return repr(self.__buffer)
+
+    def __len__(self):
+        return len(self.__buffer)
+
+    def insert(self, val, offset=0):
+        self.__buffer.insert(self.__pointer + offset, val)
+
+    def head(self):
+        return self.__buffer[0]
+
+    def tail(self):
+        return self.__buffer[-1]
+
+    def get(self, offset=0):
+        size = len(self.__buffer)
+        val = self.__buffer[(self.__pointer + offset) % size]
+        return val
+
+    def next(self):
+        size = len(self.__buffer)
+        self.__pointer = (self.__pointer + 1) % size
+
+    def reset(self):
+        self.__pointer = 0
+
+    def find(self, obj):
+        try:
+            idx = self.__buffer.index(obj)
+        except ValueError:
+            return None
+        return self.__buffer[idx]
+
+    def find_and_next(self, obj):
+        size = len(self.__buffer)
+        idx = self.__buffer.index(obj)
+        self.__pointer = (idx + 1) % size
+
+    def find_and_set(self, obj):
+        idx = self.__buffer.index(obj)
+        self.__pointer = idx
+
+    def as_list(self):
+        return self.__buffer.copy()
+
+    def reverse(self):
+        self.__buffer.reverse()
+        self.reset()
+
+
+# clip: reference polygon
+# subject: tested polygon
+def __do_weiler_atherton_cliping(clip, subject, uv_layer, mode):
+
+    clip_uvs = RingBuffer([l[uv_layer].uv.copy() for l in clip.loops])
+    if __is_polygon_flipped(clip_uvs):
+        clip_uvs.reverse()
+    subject_uvs = RingBuffer([l[uv_layer].uv.copy() for l in subject.loops])
+    if __is_polygon_flipped(subject_uvs):
+        subject_uvs.reverse()
+
+    debug_print("===== Clip UV List =====")
+    debug_print(clip_uvs)
+    debug_print("===== Subject UV List =====")
+    debug_print(subject_uvs)
+
+    # check if clip and subject is overlapped completely
+    if __is_polygon_same(clip_uvs, subject_uvs):
+        polygons = [subject_uvs.as_list()]
+        debug_print("===== Polygons Overlapped Completely =====")
+        debug_print(polygons)
+        return True, polygons
+
+    # check if subject is in clip
+    if __is_points_in_polygon(subject_uvs, clip_uvs):
+        polygons = [subject_uvs.as_list()]
+        return True, polygons
+
+    # check if clip is in subject
+    if __is_points_in_polygon(clip_uvs, subject_uvs):
+        polygons = [subject_uvs.as_list()]
+        return True, polygons
+
+    # check if clip and subject is overlapped partially
+    intersections = []
+    while True:
+        subject_uvs.reset()
+        while True:
+            uv_start1 = clip_uvs.get()
+            uv_end1 = clip_uvs.get(1)
+            uv_start2 = subject_uvs.get()
+            uv_end2 = subject_uvs.get(1)
+            intersected, point = __is_segment_intersect(uv_start1, uv_end1,
+                                                        uv_start2, uv_end2)
+            if intersected:
+                clip_uvs.insert(point, 1)
+                subject_uvs.insert(point, 1)
+                intersections.append([point,
+                                      [clip_uvs.get(), clip_uvs.get(1)]])
+            subject_uvs.next()
+            if subject_uvs.get() == subject_uvs.head():
+                break
+        clip_uvs.next()
+        if clip_uvs.get() == clip_uvs.head():
+            break
+
+    debug_print("===== Intersection List =====")
+    debug_print(intersections)
+
+    # no intersection, so subject and clip is not overlapped
+    if not intersections:
+        return False, None
+
+    def get_intersection_pair(intersects, key):
+        for sect in intersects:
+            if sect[0] == key:
+                return sect[1]
+
+        return None
+
+    # make enter/exit pair
+    subject_uvs.reset()
+    subject_entering = []
+    subject_exiting = []
+    clip_entering = []
+    clip_exiting = []
+    intersect_uv_list = []
+    while True:
+        pair = get_intersection_pair(intersections, subject_uvs.get())
+        if pair:
+            sub = subject_uvs.get(1) - subject_uvs.get(-1)
+            inter = pair[1] - pair[0]
+            cross = sub.x * inter.y - inter.x * sub.y
+            if cross < 0:
+                subject_entering.append(subject_uvs.get())
+                clip_exiting.append(subject_uvs.get())
+            else:
+                subject_exiting.append(subject_uvs.get())
+                clip_entering.append(subject_uvs.get())
+            intersect_uv_list.append(subject_uvs.get())
+
+        subject_uvs.next()
+        if subject_uvs.get() == subject_uvs.head():
+            break
+
+    debug_print("===== Enter List =====")
+    debug_print(clip_entering)
+    debug_print(subject_entering)
+    debug_print("===== Exit List =====")
+    debug_print(clip_exiting)
+    debug_print(subject_exiting)
+
+    # for now, can't handle the situation when fulfill all below conditions
+    #        * two faces have common edge
+    #        * each face is intersected
+    #        * Show Mode is "Part"
+    #       so for now, ignore this situation
+    if len(subject_entering) != len(subject_exiting):
+        if mode == 'FACE':
+            polygons = [subject_uvs.as_list()]
+            return True, polygons
+        return False, None
+
+    def traverse(current_list, entering, exiting, p, current, other_list):
+        result = current_list.find(current)
+        if not result:
+            return None
+        if result != current:
+            print("Internal Error")
+            return None
+        if not exiting:
+            print("Internal Error: No exiting UV")
+            return None
+
+        # enter
+        if entering.count(current) >= 1:
+            entering.remove(current)
+
+        current_list.find_and_next(current)
+        current = current_list.get()
+
+        prev = None
+        error = False
+        while exiting.count(current) == 0:
+            p.append(current.copy())
+            current_list.find_and_next(current)
+            current = current_list.get()
+            if prev == current:
+                error = True
+                break
+            prev = current
+
+        if error:
+            print("Internal Error: Infinite loop")
+            return None
+
+        # exit
+        p.append(current.copy())
+        exiting.remove(current)
+
+        other_list.find_and_set(current)
+        return other_list.get()
+
+    # Traverse
+    polygons = []
+    current_uv_list = subject_uvs
+    other_uv_list = clip_uvs
+    current_entering = subject_entering
+    current_exiting = subject_exiting
+
+    poly = []
+    current_uv = current_entering[0]
+
+    while True:
+        current_uv = traverse(current_uv_list, current_entering,
+                              current_exiting, poly, current_uv, other_uv_list)
+
+        if current_uv is None:
+            break
+
+        if current_uv_list == subject_uvs:
+            current_uv_list = clip_uvs
+            other_uv_list = subject_uvs
+            current_entering = clip_entering
+            current_exiting = clip_exiting
+            debug_print("-- Next: Clip --")
+        else:
+            current_uv_list = subject_uvs
+            other_uv_list = clip_uvs
+            current_entering = subject_entering
+            current_exiting = subject_exiting
+            debug_print("-- Next: Subject --")
+
+        debug_print(clip_entering)
+        debug_print(clip_exiting)
+        debug_print(subject_entering)
+        debug_print(subject_exiting)
+
+        if not clip_entering and not clip_exiting \
+                and not subject_entering and not subject_exiting:
+            break
+
+    polygons.append(poly)
+
+    debug_print("===== Polygons Overlapped Partially =====")
+    debug_print(polygons)
+
+    return True, polygons
+
+
+def __is_polygon_flipped(points):
+    area = 0.0
+    for i in range(len(points)):
+        uv1 = points.get(i)
+        uv2 = points.get(i + 1)
+        a = uv1.x * uv2.y - uv1.y * uv2.x
+        area = area + a
+    if area < 0:
+        # clock-wise
+        return True
+    return False
+
+
+def __is_point_in_polygon(point, subject_points):
+    count = 0
+    for i in range(len(subject_points)):
+        uv_start1 = subject_points.get(i)
+        uv_end1 = subject_points.get(i + 1)
+        uv_start2 = point
+        uv_end2 = Vector((1000000.0, point.y))
+        intersected, _ = __is_segment_intersect(uv_start1, uv_end1,
+                                                uv_start2, uv_end2)
+        if intersected:
+            count = count + 1
+
+    return count % 2
+
+
+def __is_points_in_polygon(points, subject_points):
+    for i in range(len(points)):
+        internal = __is_point_in_polygon(points.get(i), subject_points)
+        if not internal:
+            return False
+
+    return True
+
+
+def get_overlapped_uv_info(bm, faces, uv_layer, mode):
+    # at first, check island overlapped
+    isl = get_island_info_from_faces(bm, faces, uv_layer)
+    overlapped_isl_pairs = []
+    for i, i1 in enumerate(isl):
+        for i2 in isl[i + 1:]:
+            if (i1["max"].x < i2["min"].x) or (i2["max"].x < i1["min"].x) or \
+               (i1["max"].y < i2["min"].y) or (i2["max"].y < i1["min"].y):
+                continue
+            overlapped_isl_pairs.append([i1, i2])
+
+    # next, check polygon overlapped
+    overlapped_uvs = []
+    for oip in overlapped_isl_pairs:
+        for clip in oip[0]["faces"]:
+            f_clip = clip["face"]
+            for subject in oip[1]["faces"]:
+                f_subject = subject["face"]
+
+                # fast operation, apply bounding box algorithm
+                if (clip["max_uv"].x < subject["min_uv"].x) or \
+                   (subject["max_uv"].x < clip["min_uv"].x) or \
+                   (clip["max_uv"].y < subject["min_uv"].y) or \
+                   (subject["max_uv"].y < clip["min_uv"].y):
+                    continue
+
+                # slow operation, apply Weiler-Atherton cliping algorithm
+                result, polygons = __do_weiler_atherton_cliping(f_clip,
+                                                                f_subject,
+                                                                uv_layer, mode)
+                if result:
+                    subject_uvs = [l[uv_layer].uv.copy()
+                                   for l in f_subject.loops]
+                    overlapped_uvs.append({"clip_face": f_clip,
+                                           "subject_face": f_subject,
+                                           "subject_uvs": subject_uvs,
+                                           "polygons": polygons})
+
+    return overlapped_uvs
+
+
+def get_flipped_uv_info(faces, uv_layer):
+    flipped_uvs = []
+    for f in faces:
+        polygon = RingBuffer([l[uv_layer].uv.copy() for l in f.loops])
+        if __is_polygon_flipped(polygon):
+            uvs = [l[uv_layer].uv.copy() for l in f.loops]
+            flipped_uvs.append({"face": f, "uvs": uvs,
+                                "polygons": [polygon.as_list()]})
+
+    return flipped_uvs
+
+
+def __is_polygon_same(points1, points2):
+    if len(points1) != len(points2):
+        return False
+
+    pts1 = points1.as_list()
+    pts2 = points2.as_list()
+
+    for p1 in pts1:
+        for p2 in pts2:
+            diff = p2 - p1
+            if diff.length < 0.0000001:
+                pts2.remove(p2)
+                break
+        else:
+            return False
+
+    return True
diff --git a/magic_uv/lib/__init__.py b/magic_uv/lib/__init__.py
new file mode 100644
index 00000000..db6f9df9
--- /dev/null
+++ b/magic_uv/lib/__init__.py
@@ -0,0 +1,32 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+if "bpy" in locals():
+    import importlib
+    importlib.reload(bglx)
+else:
+    from . import bglx
+
+import bpy
diff --git a/magic_uv/lib/bglx.py b/magic_uv/lib/bglx.py
new file mode 100644
index 00000000..5abde12c
--- /dev/null
+++ b/magic_uv/lib/bglx.py
@@ -0,0 +1,275 @@
+from threading import Lock
+
+import bgl
+from bgl import Buffer as Buffer
+import gpu
+from gpu_extras.batch import batch_for_shader
+
+GL_LINES = 0
+GL_LINE_STRIP = 1
+GL_LINE_LOOP = 2
+GL_TRIANGLES = 5
+GL_TRIANGLE_FAN = 6
+GL_QUADS = 4
+
+class InternalData:
+    __inst = None
+    __lock = Lock()
+
+    def __init__(self):
+        raise NotImplementedError("Not allowed to call constructor")
+
+    @classmethod
+    def __internal_new(cls):
+        inst = super().__new__(cls)
+        inst.color = [1.0, 1.0, 1.0, 1.0]
+        inst.line_width = 1.0
+
+        return inst
+
+    @classmethod
+    def get_instance(cls):
+        if not cls.__inst:
+            with cls.__lock:
+                if not cls.__inst:
+                    cls.__inst = cls.__internal_new()
+
+        return cls.__inst
+
+    def init(self):
+        self.clear()
+
+    def set_prim_mode(self, mode):
+        self.prim_mode = mode
+
+    def set_dims(self, dims):
+        self.dims = dims
+
+    def add_vert(self, v):
+        self.verts.append(v)
+
+    def add_tex_coord(self, uv):
+        self.tex_coords.append(uv)
+
+    def set_color(self, c):
+        self.color = c
+
+    def set_line_width(self, width):
+        self.line_width = width
+
+    def clear(self):
+        self.prim_mode = None
+        self.verts = []
+        self.dims = None
+        self.tex_coords = []
+
+    def get_verts(self):
+        return self.verts
+
+    def get_dims(self):
+        return self.dims
+
+    def get_prim_mode(self):
+        return self.prim_mode
+
+    def get_color(self):
+        return self.color
+
+    def get_line_width(self):
+        return self.line_width
+
+    def get_tex_coords(self):
+        return self.tex_coords
+
+
+def glLineWidth(width):
+    inst = InternalData.get_instance()
+    inst.set_line_width(width)
+
+
+def glColor3f(r, g, b):
+    inst = InternalData.get_instance()
+    inst.set_color([r, g, b, 1.0])
+
+
+def glColor4f(r, g, b, a):
+    inst = InternalData.get_instance()
+    inst.set_color([r, g, b, a])
+
+
+def glRecti(x0, y0, x1, y1):
+    glBegin(GL_QUADS)
+    glVertex2f(x0, y0)
+    glVertex2f(x0, y1)
+    glVertex2f(x1, y1)
+    glVertex2f(x1, y0)
+    glEnd()
+
+
+def glBegin(mode):
+    inst = InternalData.get_instance()
+    inst.init()
+    inst.set_prim_mode(mode)
+
+
+def _get_transparency_shader():
+    vertex_shader = '''
+    uniform mat4 modelViewMatrix;
+    uniform mat4 projectionMatrix;
+    
+    in vec2 pos;
+    in vec2 texCoord;
+    out vec2 uvInterp;
+    
+    void main()
+    {
+        uvInterp = texCoord;
+        gl_Position = projectionMatrix * modelViewMatrix * vec4(pos.xy, 0.0, 1.0);
+        gl_Position.z = 1.0;
+    }
+    '''
+
+    fragment_shader = '''
+    uniform sampler2D image;
+    uniform vec4 color;
+    
+    in vec2 uvInterp;
+    out vec4 fragColor;
+    
+    void main()
+    {
+        fragColor = texture(image, uvInterp);
+        fragColor.a = color.a;
+    }
+    '''
+
+    return vertex_shader, fragment_shader
+
+
+def glEnd():
+    inst = InternalData.get_instance()
+
+    color = inst.get_color()
+    coords = inst.get_verts()
+    tex_coords = inst.get_tex_coords()
+    if inst.get_dims() == 2:
+        if len(tex_coords) == 0:
+            shader = gpu.shader.from_builtin('2D_UNIFORM_COLOR')
+        else:
+            #shader = gpu.shader.from_builtin('2D_IMAGE')
+            vert_shader, frag_shader = _get_transparency_shader()
+            shader = gpu.types.GPUShader(vert_shader, frag_shader)
+    else:
+        raise NotImplemented("get_dims() != 2")
+
+    if len(tex_coords) == 0:
+        data = {
+            "pos": coords,
+        }
+    else:
+        data = {
+            "pos": coords,
+            "texCoord": tex_coords
+        }
+
+    if inst.get_prim_mode() == GL_LINES:
+        indices = []
+        for i in range(0, len(coords), 2):
+            indices.append([i, i + 1])
+        batch = batch_for_shader(shader, 'LINES', data, indices=indices)
+
+    elif inst.get_prim_mode() == GL_LINE_STRIP:
+        batch = batch_for_shader(shader, 'LINE_STRIP', data)
+
+
+    elif inst.get_prim_mode() == GL_LINE_LOOP:
+        data["pos"].append(data["pos"][0])
+        batch = batch_for_shader(shader, 'LINE_STRIP', data)
+
+    elif inst.get_prim_mode() == GL_TRIANGLES:
+        indices = []
+        for i in range(0, len(coords), 3):
+            indices.append([i, i + 1, i + 2])
+        batch = batch_for_shader(shader, 'TRIS', data, indices=indices)
+
+    elif inst.get_prim_mode() == GL_TRIANGLE_FAN:
+        indices = []
+        for i in range(1, len(coords) - 1):
+            indices.append([0, i, i + 1])
+        batch = batch_for_shader(shader, 'TRIS', data, indices=indices)
+
+    elif inst.get_prim_mode() == GL_QUADS:
+        indices = []
+        for i in range(0, len(coords), 4):
+            indices.extend([[i, i + 1, i + 2], [i + 2, i + 3, i]])
+        batch = batch_for_shader(shader, 'TRIS', data, indices=indices)
+    else:
+        raise NotImplemented("get_prim_mode() != (GL_LINES|GL_TRIANGLES|GL_QUADS)")
+
+    shader.bind()
+    if len(tex_coords) != 0:
+        shader.uniform_float("modelViewMatrix", gpu.matrix.get_model_view_matrix())
+        shader.uniform_float("projectionMatrix", gpu.matrix.get_projection_matrix())
+        shader.uniform_int("image", 0)
+    shader.uniform_float("color", color)
+    batch.draw(shader)
+
+    inst.clear()
+
+
+def glVertex2f(x, y):
+    inst = InternalData.get_instance()
+    inst.add_vert([x, y])
+    inst.set_dims(2)
+
+
+def glTexCoord2f(u, v):
+    inst = InternalData.get_instance()
+    inst.add_tex_coord([u, v])
+
+
+GL_BLEND = bgl.GL_BLEND
+GL_LINE_SMOOTH = bgl.GL_LINE_SMOOTH
+GL_INT = bgl.GL_INT
+GL_SCISSOR_BOX = bgl.GL_SCISSOR_BOX
+GL_TEXTURE_2D = bgl.GL_TEXTURE_2D
+GL_TEXTURE0 = bgl.GL_TEXTURE0
+
+GL_TEXTURE_MIN_FILTER = 0
+GL_TEXTURE_MAG_FILTER = 0
+GL_LINEAR = 0
+GL_TEXTURE_ENV = 0
+GL_TEXTURE_ENV_MODE = 0
+GL_MODULATE = 0
+
+def glEnable(cap):
+    bgl.glEnable(cap)
+
+
+def glDisable(cap):
+    bgl.glDisable(cap)
+
+
+def glScissor(x, y, width, height):
+    bgl.glScissor(x, y, width, height)
+
+
+def glGetIntegerv(pname, params):
+    bgl.glGetIntegerv(pname, params)
+
+
+def glActiveTexture(texture):
+    bgl.glActiveTexture(texture)
+
+
+def glBindTexture(target, texture):
+    bgl.glBindTexture(target, texture)
+
+
+def glTexParameteri(target, pname, param):
+    pass
+
+
+def glTexEnvi(target, pname, param):
+    pass
+
diff --git a/magic_uv/op/__init__.py b/magic_uv/op/__init__.py
new file mode 100644
index 00000000..d637e78a
--- /dev/null
+++ b/magic_uv/op/__init__.py
@@ -0,0 +1,74 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+if "bpy" in locals():
+    import importlib
+    importlib.reload(align_uv)
+    importlib.reload(align_uv_cursor)
+    importlib.reload(copy_paste_uv)
+    importlib.reload(copy_paste_uv_object)
+    importlib.reload(copy_paste_uv_uvedit)
+    importlib.reload(flip_rotate_uv)
+    importlib.reload(mirror_uv)
+    importlib.reload(move_uv)
+    importlib.reload(pack_uv)
+    importlib.reload(preserve_uv_aspect)
+    importlib.reload(select_uv)
+    importlib.reload(smooth_uv)
+    importlib.reload(texture_lock)
+    importlib.reload(texture_projection)
+    importlib.reload(texture_wrap)
+    importlib.reload(transfer_uv)
+    importlib.reload(unwrap_constraint)
+    importlib.reload(uv_bounding_box)
+    importlib.reload(uv_inspection)
+    importlib.reload(uv_sculpt)
+    importlib.reload(uvw)
+    importlib.reload(world_scale_uv)
+else:
+    from . import align_uv
+    from . import align_uv_cursor
+    from . import copy_paste_uv
+    from . import copy_paste_uv_object
+    from . import copy_paste_uv_uvedit
+    from . import flip_rotate_uv
+    from . import mirror_uv
+    from . import move_uv
+    from . import pack_uv
+    from . import preserve_uv_aspect
+    from . import select_uv
+    from . import smooth_uv
+    from . import texture_lock
+    from . import texture_projection
+    from . import texture_wrap
+    from . import transfer_uv
+    from . import unwrap_constraint
+    from . import uv_bounding_box
+    from . import uv_inspection
+    from . import uv_sculpt
+    from . import uvw
+    from . import world_scale_uv
+
+import bpy
diff --git a/magic_uv/op/align_uv.py b/magic_uv/op/align_uv.py
new file mode 100644
index 00000000..f8ea4176
--- /dev/null
+++ b/magic_uv/op/align_uv.py
@@ -0,0 +1,991 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "imdjs, Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import math
+from math import atan2, tan, sin, cos
+
+import bpy
+from bpy.props import EnumProperty, BoolProperty, FloatProperty
+import bmesh
+from mathutils import Vector
+
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+from .. import common
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # 'IMAGE_EDITOR' and 'VIEW_3D' space is allowed to execute.
+    # If 'View_3D' space is not allowed, you can't find option in Tool-Shelf
+    # after the execution
+    for space in context.area.spaces:
+        if (space.type == 'IMAGE_EDITOR') or (space.type == 'VIEW_3D'):
+            break
+    else:
+        return False
+
+    return True
+
+
+# get sum vertex length of loop sequences
+def _get_loop_vert_len(loops):
+    length = 0
+    for l1, l2 in zip(loops[:-1], loops[1:]):
+        diff = l2.vert.co - l1.vert.co
+        length = length + abs(diff.length)
+
+    return length
+
+
+# get sum uv length of loop sequences
+def _get_loop_uv_len(loops, uv_layer):
+    length = 0
+    for l1, l2 in zip(loops[:-1], loops[1:]):
+        diff = l2[uv_layer].uv - l1[uv_layer].uv
+        length = length + abs(diff.length)
+
+    return length
+
+
+# get center/radius of circle by 3 vertices
+def _get_circle(v):
+    alpha = atan2((v[0].y - v[1].y), (v[0].x - v[1].x)) + math.pi / 2
+    beta = atan2((v[1].y - v[2].y), (v[1].x - v[2].x)) + math.pi / 2
+    ex = (v[0].x + v[1].x) / 2.0
+    ey = (v[0].y + v[1].y) / 2.0
+    fx = (v[1].x + v[2].x) / 2.0
+    fy = (v[1].y + v[2].y) / 2.0
+    cx = (ey - fy - ex * tan(alpha) + fx * tan(beta)) / \
+         (tan(beta) - tan(alpha))
+    cy = ey - (ex - cx) * tan(alpha)
+    center = Vector((cx, cy))
+
+    r = v[0] - center
+    radian = r.length
+
+    return center, radian
+
+
+# get position on circle with same arc length
+def _calc_v_on_circle(v, center, radius):
+    base = v[0]
+    theta = atan2(base.y - center.y, base.x - center.x)
+    new_v = []
+    for i in range(len(v)):
+        angle = theta + i * 2 * math.pi / len(v)
+        new_v.append(Vector((center.x + radius * sin(angle),
+                             center.y + radius * cos(angle))))
+
+    return new_v
+
+
+# get accumulate vertex lengths of loop sequences
+def _get_loop_vert_accum_len(loops):
+    accum_lengths = [0.0]
+    length = 0
+    for l1, l2 in zip(loops[:-1], loops[1:]):
+        diff = l2.vert.co - l1.vert.co
+        length = length + abs(diff.length)
+        accum_lengths.extend([length])
+
+    return accum_lengths
+
+
+# get sum uv length of loop sequences
+def _get_loop_uv_accum_len(loops, uv_layer):
+    accum_lengths = [0.0]
+    length = 0
+    for l1, l2 in zip(loops[:-1], loops[1:]):
+        diff = l2[uv_layer].uv - l1[uv_layer].uv
+        length = length + abs(diff.length)
+        accum_lengths.extend([length])
+
+    return accum_lengths
+
+
+# get horizontal differential of UV influenced by mesh vertex
+def _get_hdiff_uv_vinfl(uv_layer, loop_seqs, vidx, hidx, pidx, infl):
+    common.debug_print(
+        "loop_seqs[hidx={0}][vidx={1}][pidx={2}]".format(hidx, vidx, pidx))
+
+    base_uv = loop_seqs[0][vidx][0][uv_layer].uv.copy()
+
+    # calculate original length
+    hloops = []
+    for s in loop_seqs:
+        hloops.extend([s[vidx][0], s[vidx][1]])
+    total_vlen = _get_loop_vert_len(hloops)
+    accum_vlens = _get_loop_vert_accum_len(hloops)
+    total_uvlen = _get_loop_uv_len(hloops, uv_layer)
+    accum_uvlens = _get_loop_uv_accum_len(hloops, uv_layer)
+    orig_uvs = [l[uv_layer].uv.copy() for l in hloops]
+
+    # calculate target length
+    tgt_noinfl = total_uvlen * (hidx + pidx) / len(loop_seqs)
+    tgt_infl = total_uvlen * accum_vlens[hidx * 2 + pidx] / total_vlen
+    target_length = tgt_noinfl * (1 - infl) + tgt_infl * infl
+    common.debug_print(target_length)
+    common.debug_print(accum_uvlens)
+
+    # calculate target UV
+    for i in range(len(accum_uvlens[:-1])):
+        # get line segment which UV will be placed
+        if ((accum_uvlens[i] <= target_length) and
+                (accum_uvlens[i + 1] > target_length)):
+            tgt_seg_len = target_length - accum_uvlens[i]
+            seg_len = accum_uvlens[i + 1] - accum_uvlens[i]
+            uv1 = orig_uvs[i]
+            uv2 = orig_uvs[i + 1]
+            target_uv = (uv1 - base_uv) + (uv2 - uv1) * tgt_seg_len / seg_len
+            break
+        elif i == (len(accum_uvlens[:-1]) - 1):
+            if abs(accum_uvlens[i + 1] - target_length) > 0.000001:
+                raise Exception(
+                    "Internal Error: horizontal_target_length={}"
+                    " is not equal to {}"
+                    .format(target_length, accum_uvlens[-1]))
+            tgt_seg_len = target_length - accum_uvlens[i]
+            seg_len = accum_uvlens[i + 1] - accum_uvlens[i]
+            uv1 = orig_uvs[i]
+            uv2 = orig_uvs[i + 1]
+            target_uv = (uv1 - base_uv) + (uv2 - uv1) * tgt_seg_len / seg_len
+            break
+    else:
+        raise Exception("Internal Error: horizontal_target_length={}"
+                        " is not in range {} to {}"
+                        .format(target_length, accum_uvlens[0],
+                                accum_uvlens[-1]))
+
+    return target_uv
+
+
+# --------------------- LOOP STRUCTURE ----------------------
+#
+#  loops[hidx][vidx][pidx]
+#     hidx: horizontal index
+#     vidx: vertical index
+#     pidx: pair index
+#
+#              <----- horizontal ----->
+#
+#              (hidx, vidx, pidx) = (0, 3, 0)
+#              |      (hidx, vidx, pidx) = (1, 3, 0)
+#              v      v
+#          ^   o --- oo --- o
+#          |   |     ||     |
+# vertical |   o --- oo --- o  <- (hidx, vidx, pidx)
+#          |   o --- oo --- o          = (1, 2, 1)
+#          |   |     ||     |
+#          v   o --- oo --- o
+#              ^            ^
+#              |            (hidx, vidx, pidx) = (1, 0, 1)
+#              (hidx, vidx, pidx) = (0, 0, 0)
+#
+# -----------------------------------------------------------
+
+
+# get vertical differential of UV influenced by mesh vertex
+def _get_vdiff_uv_vinfl(uv_layer, loop_seqs, vidx, hidx, pidx, infl):
+    common.debug_print(
+        "loop_seqs[hidx={0}][vidx={1}][pidx={2}]".format(hidx, vidx, pidx))
+
+    base_uv = loop_seqs[hidx][0][pidx][uv_layer].uv.copy()
+
+    # calculate original length
+    vloops = []
+    for s in loop_seqs[hidx]:
+        vloops.append(s[pidx])
+    total_vlen = _get_loop_vert_len(vloops)
+    accum_vlens = _get_loop_vert_accum_len(vloops)
+    total_uvlen = _get_loop_uv_len(vloops, uv_layer)
+    accum_uvlens = _get_loop_uv_accum_len(vloops, uv_layer)
+    orig_uvs = [l[uv_layer].uv.copy() for l in vloops]
+
+    # calculate target length
+    tgt_noinfl = total_uvlen * int((vidx + 1) / 2) * 2 / len(loop_seqs[hidx])
+    tgt_infl = total_uvlen * accum_vlens[vidx] / total_vlen
+    target_length = tgt_noinfl * (1 - infl) + tgt_infl * infl
+    common.debug_print(target_length)
+    common.debug_print(accum_uvlens)
+
+    # calculate target UV
+    for i in range(len(accum_uvlens[:-1])):
+        # get line segment which UV will be placed
+        if ((accum_uvlens[i] <= target_length) and
+                (accum_uvlens[i + 1] > target_length)):
+            tgt_seg_len = target_length - accum_uvlens[i]
+            seg_len = accum_uvlens[i + 1] - accum_uvlens[i]
+            uv1 = orig_uvs[i]
+            uv2 = orig_uvs[i + 1]
+            target_uv = (uv1 - base_uv) + (uv2 - uv1) * tgt_seg_len / seg_len
+            break
+        elif i == (len(accum_uvlens[:-1]) - 1):
+            if abs(accum_uvlens[i + 1] - target_length) > 0.000001:
+                raise Exception("Internal Error: horizontal_target_length={}"
+                                " is not equal to {}"
+                                .format(target_length, accum_uvlens[-1]))
+            tgt_seg_len = target_length - accum_uvlens[i]
+            seg_len = accum_uvlens[i + 1] - accum_uvlens[i]
+            uv1 = orig_uvs[i]
+            uv2 = orig_uvs[i + 1]
+            target_uv = (uv1 - base_uv) + (uv2 - uv1) * tgt_seg_len / seg_len
+            break
+    else:
+        raise Exception("Internal Error: horizontal_target_length={}"
+                        " is not in range {} to {}"
+                        .format(target_length, accum_uvlens[0],
+                                accum_uvlens[-1]))
+
+    return target_uv
+
+
+# get horizontal differential of UV no influenced
+def _get_hdiff_uv(uv_layer, loop_seqs, hidx):
+    base_uv = loop_seqs[0][0][0][uv_layer].uv.copy()
+    h_uv = loop_seqs[-1][0][1][uv_layer].uv.copy() - base_uv
+
+    return hidx * h_uv / len(loop_seqs)
+
+
+# get vertical differential of UV no influenced
+def _get_vdiff_uv(uv_layer, loop_seqs, vidx, hidx):
+    base_uv = loop_seqs[0][0][0][uv_layer].uv.copy()
+    v_uv = loop_seqs[0][-1][0][uv_layer].uv.copy() - base_uv
+
+    hseq = loop_seqs[hidx]
+    return int((vidx + 1) / 2) * v_uv / (len(hseq) / 2)
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "align_uv"
+
+    @classmethod
+    def init_props(cls, scene):
+        scene.muv_align_uv_enabled = BoolProperty(
+            name="Align UV Enabled",
+            description="Align UV is enabled",
+            default=False
+        )
+        scene.muv_align_uv_transmission = BoolProperty(
+            name="Transmission",
+            description="Align linked UVs",
+            default=False
+        )
+        scene.muv_align_uv_select = BoolProperty(
+            name="Select",
+            description="Select UVs which are aligned",
+            default=False
+        )
+        scene.muv_align_uv_vertical = BoolProperty(
+            name="Vert-Infl (Vertical)",
+            description="Align vertical direction influenced "
+                        "by mesh vertex proportion",
+            default=False
+        )
+        scene.muv_align_uv_horizontal = BoolProperty(
+            name="Vert-Infl (Horizontal)",
+            description="Align horizontal direction influenced "
+                        "by mesh vertex proportion",
+            default=False
+        )
+        scene.muv_align_uv_mesh_infl = FloatProperty(
+            name="Mesh Influence",
+            description="Influence rate of mesh vertex",
+            min=0.0,
+            max=1.0,
+            default=0.0
+        )
+        scene.muv_align_uv_location = EnumProperty(
+            name="Location",
+            description="Align location",
+            items=[
+                ('LEFT_TOP', "Left/Top", "Align to Left or Top"),
+                ('MIDDLE', "Middle", "Align to middle"),
+                ('RIGHT_BOTTOM', "Right/Bottom", "Align to Right or Bottom")
+            ],
+            default='MIDDLE'
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_align_uv_enabled
+        del scene.muv_align_uv_transmission
+        del scene.muv_align_uv_select
+        del scene.muv_align_uv_vertical
+        del scene.muv_align_uv_horizontal
+        del scene.muv_align_uv_mesh_infl
+        del scene.muv_align_uv_location
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_AlignUV_Circle(bpy.types.Operator):
+
+    bl_idname = "uv.muv_ot_align_uv_circle"
+    bl_label = "Align UV (Circle)"
+    bl_description = "Align UV coordinates to Circle"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    transmission = BoolProperty(
+        name="Transmission",
+        description="Align linked UVs",
+        default=False
+    )
+    select = BoolProperty(
+        name="Select",
+        description="Select UVs which are aligned",
+        default=False
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+        uv_layer = bm.loops.layers.uv.verify()
+
+        # loop_seqs[horizontal][vertical][loop]
+        loop_seqs, error = common.get_loop_sequences(bm, uv_layer, True)
+        if not loop_seqs:
+            self.report({'WARNING'}, error)
+            return {'CANCELLED'}
+
+        # get circle and new UVs
+        uvs = [hseq[0][0][uv_layer].uv.copy() for hseq in loop_seqs]
+        c, r = _get_circle(uvs[0:3])
+        new_uvs = _calc_v_on_circle(uvs, c, r)
+
+        # check center UV of circle
+        center = loop_seqs[0][-1][0].vert
+        for hseq in loop_seqs[1:]:
+            if len(hseq[-1]) != 1:
+                self.report({'WARNING'}, "Last face must be triangle")
+                return {'CANCELLED'}
+            if hseq[-1][0].vert != center:
+                self.report({'WARNING'}, "Center must be identical")
+                return {'CANCELLED'}
+
+        # align to circle
+        if self.transmission:
+            for hidx, hseq in enumerate(loop_seqs):
+                for vidx, pair in enumerate(hseq):
+                    all_ = int((len(hseq) + 1) / 2)
+                    r = (all_ - int((vidx + 1) / 2)) / all_
+                    pair[0][uv_layer].uv = c + (new_uvs[hidx] - c) * r
+                    if self.select:
+                        pair[0][uv_layer].select = True
+
+                    if len(pair) < 2:
+                        continue
+                    # for quad polygon
+                    next_hidx = (hidx + 1) % len(loop_seqs)
+                    pair[1][uv_layer].uv = c + ((new_uvs[next_hidx]) - c) * r
+                    if self.select:
+                        pair[1][uv_layer].select = True
+        else:
+            for hidx, hseq in enumerate(loop_seqs):
+                pair = hseq[0]
+                pair[0][uv_layer].uv = new_uvs[hidx]
+                pair[1][uv_layer].uv = new_uvs[(hidx + 1) % len(loop_seqs)]
+                if self.select:
+                    pair[0][uv_layer].select = True
+                    pair[1][uv_layer].select = True
+
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_AlignUV_Straighten(bpy.types.Operator):
+
+    bl_idname = "uv.muv_ot_align_uv_straighten"
+    bl_label = "Align UV (Straighten)"
+    bl_description = "Straighten UV coordinates"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    transmission = BoolProperty(
+        name="Transmission",
+        description="Align linked UVs",
+        default=False
+    )
+    select = BoolProperty(
+        name="Select",
+        description="Select UVs which are aligned",
+        default=False
+    )
+    vertical = BoolProperty(
+        name="Vert-Infl (Vertical)",
+        description="Align vertical direction influenced "
+                    "by mesh vertex proportion",
+        default=False
+    )
+    horizontal = BoolProperty(
+        name="Vert-Infl (Horizontal)",
+        description="Align horizontal direction influenced "
+                    "by mesh vertex proportion",
+        default=False
+    )
+    mesh_infl = FloatProperty(
+        name="Mesh Influence",
+        description="Influence rate of mesh vertex",
+        min=0.0,
+        max=1.0,
+        default=0.0
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    # selected and paralleled UV loop sequence will be aligned
+    def __align_w_transmission(self, loop_seqs, uv_layer):
+        base_uv = loop_seqs[0][0][0][uv_layer].uv.copy()
+
+        # calculate diff UVs
+        diff_uvs = []
+        # hseq[vertical][loop]
+        for hidx, hseq in enumerate(loop_seqs):
+            # pair[loop]
+            diffs = []
+            for vidx in range(0, len(hseq), 2):
+                if self.horizontal:
+                    hdiff_uvs = [
+                        _get_hdiff_uv_vinfl(uv_layer, loop_seqs, vidx, hidx, 0,
+                                            self.mesh_infl),
+                        _get_hdiff_uv_vinfl(uv_layer, loop_seqs, vidx, hidx, 1,
+                                            self.mesh_infl),
+                        _get_hdiff_uv_vinfl(uv_layer, loop_seqs, vidx + 1,
+                                            hidx, 0, self.mesh_infl),
+                        _get_hdiff_uv_vinfl(uv_layer, loop_seqs, vidx + 1,
+                                            hidx, 1, self.mesh_infl),
+                    ]
+                else:
+                    hdiff_uvs = [
+                        _get_hdiff_uv(uv_layer, loop_seqs, hidx),
+                        _get_hdiff_uv(uv_layer, loop_seqs, hidx + 1),
+                        _get_hdiff_uv(uv_layer, loop_seqs, hidx),
+                        _get_hdiff_uv(uv_layer, loop_seqs, hidx + 1)
+                    ]
+                if self.vertical:
+                    vdiff_uvs = [
+                        _get_vdiff_uv_vinfl(uv_layer, loop_seqs, vidx, hidx, 0,
+                                            self.mesh_infl),
+                        _get_vdiff_uv_vinfl(uv_layer, loop_seqs, vidx, hidx, 1,
+                                            self.mesh_infl),
+                        _get_vdiff_uv_vinfl(uv_layer, loop_seqs, vidx + 1,
+                                            hidx, 0, self.mesh_infl),
+                        _get_vdiff_uv_vinfl(uv_layer, loop_seqs, vidx + 1,
+                                            hidx, 1, self.mesh_infl),
+                    ]
+                else:
+                    vdiff_uvs = [
+                        _get_vdiff_uv(uv_layer, loop_seqs, vidx, hidx),
+                        _get_vdiff_uv(uv_layer, loop_seqs, vidx, hidx),
+                        _get_vdiff_uv(uv_layer, loop_seqs, vidx + 1, hidx),
+                        _get_vdiff_uv(uv_layer, loop_seqs, vidx + 1, hidx)
+                    ]
+                diffs.append([hdiff_uvs, vdiff_uvs])
+            diff_uvs.append(diffs)
+
+        # update UV
+        for hseq, diffs in zip(loop_seqs, diff_uvs):
+            for vidx in range(0, len(hseq), 2):
+                loops = [
+                    hseq[vidx][0], hseq[vidx][1],
+                    hseq[vidx + 1][0], hseq[vidx + 1][1]
+                ]
+                for l, hdiff, vdiff in zip(loops, diffs[int(vidx / 2)][0],
+                                           diffs[int(vidx / 2)][1]):
+                    l[uv_layer].uv = base_uv + hdiff + vdiff
+                    if self.select:
+                        l[uv_layer].select = True
+
+    # only selected UV loop sequence will be aligned
+    def __align_wo_transmission(self, loop_seqs, uv_layer):
+        base_uv = loop_seqs[0][0][0][uv_layer].uv.copy()
+
+        h_uv = loop_seqs[-1][0][1][uv_layer].uv.copy() - base_uv
+        for hidx, hseq in enumerate(loop_seqs):
+            # only selected loop pair is targeted
+            pair = hseq[0]
+            hdiff_uv_0 = hidx * h_uv / len(loop_seqs)
+            hdiff_uv_1 = (hidx + 1) * h_uv / len(loop_seqs)
+            pair[0][uv_layer].uv = base_uv + hdiff_uv_0
+            pair[1][uv_layer].uv = base_uv + hdiff_uv_1
+            if self.select:
+                pair[0][uv_layer].select = True
+                pair[1][uv_layer].select = True
+
+    def __align(self, loop_seqs, uv_layer):
+        if self.transmission:
+            self.__align_w_transmission(loop_seqs, uv_layer)
+        else:
+            self.__align_wo_transmission(loop_seqs, uv_layer)
+
+    def execute(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+        uv_layer = bm.loops.layers.uv.verify()
+
+        # loop_seqs[horizontal][vertical][loop]
+        loop_seqs, error = common.get_loop_sequences(bm, uv_layer)
+        if not loop_seqs:
+            self.report({'WARNING'}, error)
+            return {'CANCELLED'}
+
+        # align
+        self.__align(loop_seqs, uv_layer)
+
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_AlignUV_Axis(bpy.types.Operator):
+
+    bl_idname = "uv.muv_ot_align_uv_axis"
+    bl_label = "Align UV (XY-Axis)"
+    bl_description = "Align UV to XY-axis"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    transmission = BoolProperty(
+        name="Transmission",
+        description="Align linked UVs",
+        default=False
+    )
+    select = BoolProperty(
+        name="Select",
+        description="Select UVs which are aligned",
+        default=False
+    )
+    vertical = BoolProperty(
+        name="Vert-Infl (Vertical)",
+        description="Align vertical direction influenced "
+                    "by mesh vertex proportion",
+        default=False
+    )
+    horizontal = BoolProperty(
+        name="Vert-Infl (Horizontal)",
+        description="Align horizontal direction influenced "
+                    "by mesh vertex proportion",
+        default=False
+    )
+    location = EnumProperty(
+        name="Location",
+        description="Align location",
+        items=[
+            ('LEFT_TOP', "Left/Top", "Align to Left or Top"),
+            ('MIDDLE', "Middle", "Align to middle"),
+            ('RIGHT_BOTTOM', "Right/Bottom", "Align to Right or Bottom")
+        ],
+        default='MIDDLE'
+    )
+    mesh_infl = FloatProperty(
+        name="Mesh Influence",
+        description="Influence rate of mesh vertex",
+        min=0.0,
+        max=1.0,
+        default=0.0
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    # get min/max of UV
+    def __get_uv_max_min(self, loop_seqs, uv_layer):
+        uv_max = Vector((-1000000.0, -1000000.0))
+        uv_min = Vector((1000000.0, 1000000.0))
+        for hseq in loop_seqs:
+            for l in hseq[0]:
+                uv = l[uv_layer].uv
+                uv_max.x = max(uv.x, uv_max.x)
+                uv_max.y = max(uv.y, uv_max.y)
+                uv_min.x = min(uv.x, uv_min.x)
+                uv_min.y = min(uv.y, uv_min.y)
+
+        return uv_max, uv_min
+
+    # get UV differentiation when UVs are aligned to X-axis
+    def __get_x_axis_align_diff_uvs(self, loop_seqs, uv_layer, uv_min,
+                                    width, height):
+        diff_uvs = []
+        for hidx, hseq in enumerate(loop_seqs):
+            pair = hseq[0]
+            luv0 = pair[0][uv_layer]
+            luv1 = pair[1][uv_layer]
+            target_uv0 = Vector((0.0, 0.0))
+            target_uv1 = Vector((0.0, 0.0))
+            if self.location == 'RIGHT_BOTTOM':
+                target_uv0.y = target_uv1.y = uv_min.y
+            elif self.location == 'MIDDLE':
+                target_uv0.y = target_uv1.y = uv_min.y + height * 0.5
+            elif self.location == 'LEFT_TOP':
+                target_uv0.y = target_uv1.y = uv_min.y + height
+            if luv0.uv.x < luv1.uv.x:
+                target_uv0.x = uv_min.x + hidx * width / len(loop_seqs)
+                target_uv1.x = uv_min.x + (hidx + 1) * width / len(loop_seqs)
+            else:
+                target_uv0.x = uv_min.x + (hidx + 1) * width / len(loop_seqs)
+                target_uv1.x = uv_min.x + hidx * width / len(loop_seqs)
+            diff_uvs.append([target_uv0 - luv0.uv, target_uv1 - luv1.uv])
+
+        return diff_uvs
+
+    # get UV differentiation when UVs are aligned to Y-axis
+    def __get_y_axis_align_diff_uvs(self, loop_seqs, uv_layer, uv_min,
+                                    width, height):
+        diff_uvs = []
+        for hidx, hseq in enumerate(loop_seqs):
+            pair = hseq[0]
+            luv0 = pair[0][uv_layer]
+            luv1 = pair[1][uv_layer]
+            target_uv0 = Vector((0.0, 0.0))
+            target_uv1 = Vector((0.0, 0.0))
+            if self.location == 'RIGHT_BOTTOM':
+                target_uv0.x = target_uv1.x = uv_min.x + width
+            elif self.location == 'MIDDLE':
+                target_uv0.x = target_uv1.x = uv_min.x + width * 0.5
+            elif self.location == 'LEFT_TOP':
+                target_uv0.x = target_uv1.x = uv_min.x
+            if luv0.uv.y < luv1.uv.y:
+                target_uv0.y = uv_min.y + hidx * height / len(loop_seqs)
+                target_uv1.y = uv_min.y + (hidx + 1) * height / len(loop_seqs)
+            else:
+                target_uv0.y = uv_min.y + (hidx + 1) * height / len(loop_seqs)
+                target_uv1.y = uv_min.y + hidx * height / len(loop_seqs)
+            diff_uvs.append([target_uv0 - luv0.uv, target_uv1 - luv1.uv])
+
+        return diff_uvs
+
+    # only selected UV loop sequence will be aligned along to X-axis
+    def __align_to_x_axis_wo_transmission(self, loop_seqs, uv_layer,
+                                          uv_min, width, height):
+        # reverse if the UV coordinate is not sorted by position
+        need_revese = loop_seqs[0][0][0][uv_layer].uv.x > \
+            loop_seqs[-1][0][0][uv_layer].uv.x
+        if need_revese:
+            loop_seqs.reverse()
+            for hidx, hseq in enumerate(loop_seqs):
+                for vidx, pair in enumerate(hseq):
+                    tmp = loop_seqs[hidx][vidx][0]
+                    loop_seqs[hidx][vidx][0] = loop_seqs[hidx][vidx][1]
+                    loop_seqs[hidx][vidx][1] = tmp
+
+        # get UV differential
+        diff_uvs = self.__get_x_axis_align_diff_uvs(loop_seqs,
+                                                    uv_layer, uv_min,
+                                                    width, height)
+
+        # update UV
+        for hseq, duv in zip(loop_seqs, diff_uvs):
+            pair = hseq[0]
+            luv0 = pair[0][uv_layer]
+            luv1 = pair[1][uv_layer]
+            luv0.uv = luv0.uv + duv[0]
+            luv1.uv = luv1.uv + duv[1]
+
+    # only selected UV loop sequence will be aligned along to Y-axis
+    def __align_to_y_axis_wo_transmission(self, loop_seqs, uv_layer,
+                                          uv_min, width, height):
+        # reverse if the UV coordinate is not sorted by position
+        need_revese = loop_seqs[0][0][0][uv_layer].uv.y > \
+            loop_seqs[-1][0][0][uv_layer].uv.y
+        if need_revese:
+            loop_seqs.reverse()
+            for hidx, hseq in enumerate(loop_seqs):
+                for vidx, pair in enumerate(hseq):
+                    tmp = loop_seqs[hidx][vidx][0]
+                    loop_seqs[hidx][vidx][0] = loop_seqs[hidx][vidx][1]
+                    loop_seqs[hidx][vidx][1] = tmp
+
+        # get UV differential
+        diff_uvs = self.__get_y_axis_align_diff_uvs(loop_seqs,
+                                                    uv_layer, uv_min,
+                                                    width, height)
+
+        # update UV
+        for hseq, duv in zip(loop_seqs, diff_uvs):
+            pair = hseq[0]
+            luv0 = pair[0][uv_layer]
+            luv1 = pair[1][uv_layer]
+            luv0.uv = luv0.uv + duv[0]
+            luv1.uv = luv1.uv + duv[1]
+
+    # selected and paralleled UV loop sequence will be aligned along to X-axis
+    def __align_to_x_axis_w_transmission(self, loop_seqs, uv_layer,
+                                         uv_min, width, height):
+        # reverse if the UV coordinate is not sorted by position
+        need_revese = loop_seqs[0][0][0][uv_layer].uv.x > \
+            loop_seqs[-1][0][0][uv_layer].uv.x
+        if need_revese:
+            loop_seqs.reverse()
+            for hidx, hseq in enumerate(loop_seqs):
+                for vidx in range(len(hseq)):
+                    tmp = loop_seqs[hidx][vidx][0]
+                    loop_seqs[hidx][vidx][0] = loop_seqs[hidx][vidx][1]
+                    loop_seqs[hidx][vidx][1] = tmp
+
+        # get offset UVs when the UVs are aligned to X-axis
+        align_diff_uvs = self.__get_x_axis_align_diff_uvs(loop_seqs,
+                                                          uv_layer, uv_min,
+                                                          width, height)
+        base_uv = loop_seqs[0][0][0][uv_layer].uv.copy()
+        offset_uvs = []
+        for hseq, aduv in zip(loop_seqs, align_diff_uvs):
+            luv0 = hseq[0][0][uv_layer]
+            luv1 = hseq[0][1][uv_layer]
+            offset_uvs.append([luv0.uv + aduv[0] - base_uv,
+                               luv1.uv + aduv[1] - base_uv])
+
+        # get UV differential
+        diff_uvs = []
+        # hseq[vertical][loop]
+        for hidx, hseq in enumerate(loop_seqs):
+            # pair[loop]
+            diffs = []
+            for vidx in range(0, len(hseq), 2):
+                if self.horizontal:
+                    hdiff_uvs = [
+                        _get_hdiff_uv_vinfl(uv_layer, loop_seqs, vidx, hidx, 0,
+                                            self.mesh_infl),
+                        _get_hdiff_uv_vinfl(uv_layer, loop_seqs, vidx, hidx, 1,
+                                            self.mesh_infl),
+                        _get_hdiff_uv_vinfl(uv_layer, loop_seqs, vidx + 1,
+                                            hidx, 0, self.mesh_infl),
+                        _get_hdiff_uv_vinfl(uv_layer, loop_seqs, vidx + 1,
+                                            hidx, 1, self.mesh_infl),
+                    ]
+                    hdiff_uvs[0].y = hdiff_uvs[0].y + offset_uvs[hidx][0].y
+                    hdiff_uvs[1].y = hdiff_uvs[1].y + offset_uvs[hidx][1].y
+                    hdiff_uvs[2].y = hdiff_uvs[2].y + offset_uvs[hidx][0].y
+                    hdiff_uvs[3].y = hdiff_uvs[3].y + offset_uvs[hidx][1].y
+                else:
+                    hdiff_uvs = [
+                        offset_uvs[hidx][0],
+                        offset_uvs[hidx][1],
+                        offset_uvs[hidx][0],
+                        offset_uvs[hidx][1],
+                    ]
+                if self.vertical:
+                    vdiff_uvs = [
+                        _get_vdiff_uv_vinfl(uv_layer, loop_seqs, vidx, hidx, 0,
+                                            self.mesh_infl),
+                        _get_vdiff_uv_vinfl(uv_layer, loop_seqs, vidx, hidx, 1,
+                                            self.mesh_infl),
+                        _get_vdiff_uv_vinfl(uv_layer, loop_seqs, vidx + 1,
+                                            hidx, 0, self.mesh_infl),
+                        _get_vdiff_uv_vinfl(uv_layer, loop_seqs, vidx + 1,
+                                            hidx, 1, self.mesh_infl),
+                    ]
+                else:
+                    vdiff_uvs = [
+                        _get_vdiff_uv(uv_layer, loop_seqs, vidx, hidx),
+                        _get_vdiff_uv(uv_layer, loop_seqs, vidx, hidx),
+                        _get_vdiff_uv(uv_layer, loop_seqs, vidx + 1, hidx),
+                        _get_vdiff_uv(uv_layer, loop_seqs, vidx + 1, hidx)
+                    ]
+                diffs.append([hdiff_uvs, vdiff_uvs])
+            diff_uvs.append(diffs)
+
+        # update UV
+        for hseq, diffs in zip(loop_seqs, diff_uvs):
+            for vidx in range(0, len(hseq), 2):
+                loops = [
+                    hseq[vidx][0], hseq[vidx][1],
+                    hseq[vidx + 1][0], hseq[vidx + 1][1]
+                ]
+                for l, hdiff, vdiff in zip(loops, diffs[int(vidx / 2)][0],
+                                           diffs[int(vidx / 2)][1]):
+                    l[uv_layer].uv = base_uv + hdiff + vdiff
+                    if self.select:
+                        l[uv_layer].select = True
+
+    # selected and paralleled UV loop sequence will be aligned along to Y-axis
+    def __align_to_y_axis_w_transmission(self, loop_seqs, uv_layer,
+                                         uv_min, width, height):
+        # reverse if the UV coordinate is not sorted by position
+        need_revese = loop_seqs[0][0][0][uv_layer].uv.y > \
+            loop_seqs[-1][0][-1][uv_layer].uv.y
+        if need_revese:
+            loop_seqs.reverse()
+            for hidx, hseq in enumerate(loop_seqs):
+                for vidx in range(len(hseq)):
+                    tmp = loop_seqs[hidx][vidx][0]
+                    loop_seqs[hidx][vidx][0] = loop_seqs[hidx][vidx][1]
+                    loop_seqs[hidx][vidx][1] = tmp
+
+        # get offset UVs when the UVs are aligned to Y-axis
+        align_diff_uvs = self.__get_y_axis_align_diff_uvs(loop_seqs,
+                                                          uv_layer, uv_min,
+                                                          width, height)
+        base_uv = loop_seqs[0][0][0][uv_layer].uv.copy()
+        offset_uvs = []
+        for hseq, aduv in zip(loop_seqs, align_diff_uvs):
+            luv0 = hseq[0][0][uv_layer]
+            luv1 = hseq[0][1][uv_layer]
+            offset_uvs.append([luv0.uv + aduv[0] - base_uv,
+                               luv1.uv + aduv[1] - base_uv])
+
+        # get UV differential
+        diff_uvs = []
+        # hseq[vertical][loop]
+        for hidx, hseq in enumerate(loop_seqs):
+            # pair[loop]
+            diffs = []
+            for vidx in range(0, len(hseq), 2):
+                if self.horizontal:
+                    hdiff_uvs = [
+                        _get_hdiff_uv_vinfl(uv_layer, loop_seqs, vidx, hidx, 0,
+                                            self.mesh_infl),
+                        _get_hdiff_uv_vinfl(uv_layer, loop_seqs, vidx, hidx, 1,
+                                            self.mesh_infl),
+                        _get_hdiff_uv_vinfl(uv_layer, loop_seqs, vidx + 1,
+                                            hidx, 0, self.mesh_infl),
+                        _get_hdiff_uv_vinfl(uv_layer, loop_seqs, vidx + 1,
+                                            hidx, 1, self.mesh_infl),
+                    ]
+                    hdiff_uvs[0].x = hdiff_uvs[0].x + offset_uvs[hidx][0].x
+                    hdiff_uvs[1].x = hdiff_uvs[1].x + offset_uvs[hidx][1].x
+                    hdiff_uvs[2].x = hdiff_uvs[2].x + offset_uvs[hidx][0].x
+                    hdiff_uvs[3].x = hdiff_uvs[3].x + offset_uvs[hidx][1].x
+                else:
+                    hdiff_uvs = [
+                        offset_uvs[hidx][0],
+                        offset_uvs[hidx][1],
+                        offset_uvs[hidx][0],
+                        offset_uvs[hidx][1],
+                    ]
+                if self.vertical:
+                    vdiff_uvs = [
+                        _get_vdiff_uv_vinfl(uv_layer, loop_seqs, vidx, hidx, 0,
+                                            self.mesh_infl),
+                        _get_vdiff_uv_vinfl(uv_layer, loop_seqs, vidx, hidx, 1,
+                                            self.mesh_infl),
+                        _get_vdiff_uv_vinfl(uv_layer, loop_seqs, vidx + 1,
+                                            hidx, 0, self.mesh_infl),
+                        _get_vdiff_uv_vinfl(uv_layer, loop_seqs, vidx + 1,
+                                            hidx, 1, self.mesh_infl),
+                    ]
+                else:
+                    vdiff_uvs = [
+                        _get_vdiff_uv(uv_layer, loop_seqs, vidx, hidx),
+                        _get_vdiff_uv(uv_layer, loop_seqs, vidx, hidx),
+                        _get_vdiff_uv(uv_layer, loop_seqs, vidx + 1, hidx),
+                        _get_vdiff_uv(uv_layer, loop_seqs, vidx + 1, hidx)
+                    ]
+                diffs.append([hdiff_uvs, vdiff_uvs])
+            diff_uvs.append(diffs)
+
+        # update UV
+        for hseq, diffs in zip(loop_seqs, diff_uvs):
+            for vidx in range(0, len(hseq), 2):
+                loops = [
+                    hseq[vidx][0], hseq[vidx][1],
+                    hseq[vidx + 1][0], hseq[vidx + 1][1]
+                ]
+                for l, hdiff, vdiff in zip(loops, diffs[int(vidx / 2)][0],
+                                           diffs[int(vidx / 2)][1]):
+                    l[uv_layer].uv = base_uv + hdiff + vdiff
+                    if self.select:
+                        l[uv_layer].select = True
+
+    def __align(self, loop_seqs, uv_layer, uv_min, width, height):
+        # align along to x-axis
+        if width > height:
+            if self.transmission:
+                self.__align_to_x_axis_w_transmission(loop_seqs,
+                                                      uv_layer, uv_min,
+                                                      width, height)
+            else:
+                self.__align_to_x_axis_wo_transmission(loop_seqs,
+                                                       uv_layer, uv_min,
+                                                       width, height)
+        # align along to y-axis
+        else:
+            if self.transmission:
+                self.__align_to_y_axis_w_transmission(loop_seqs,
+                                                      uv_layer, uv_min,
+                                                      width, height)
+            else:
+                self.__align_to_y_axis_wo_transmission(loop_seqs,
+                                                       uv_layer, uv_min,
+                                                       width, height)
+
+    def execute(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+        uv_layer = bm.loops.layers.uv.verify()
+
+        # loop_seqs[horizontal][vertical][loop]
+        loop_seqs, error = common.get_loop_sequences(bm, uv_layer)
+        if not loop_seqs:
+            self.report({'WARNING'}, error)
+            return {'CANCELLED'}
+
+        # get height and width
+        uv_max, uv_min = self.__get_uv_max_min(loop_seqs, uv_layer)
+        width = uv_max.x - uv_min.x
+        height = uv_max.y - uv_min.y
+
+        self.__align(loop_seqs, uv_layer, uv_min, width, height)
+
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/align_uv_cursor.py b/magic_uv/op/align_uv_cursor.py
new file mode 100644
index 00000000..86d13179
--- /dev/null
+++ b/magic_uv/op/align_uv_cursor.py
@@ -0,0 +1,269 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+from mathutils import Vector
+from bpy.props import EnumProperty, BoolProperty, FloatVectorProperty
+import bmesh
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+
+def _is_valid_context(context):
+    # 'IMAGE_EDITOR' and 'VIEW_3D' space is allowed to execute.
+    # If 'View_3D' space is not allowed, you can't find option in Tool-Shelf
+    # after the execution
+    for space in context.area.spaces:
+        if (space.type == 'IMAGE_EDITOR') or (space.type == 'VIEW_3D'):
+            break
+    else:
+        return False
+
+    return True
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "align_uv_cursor"
+
+    @classmethod
+    def init_props(cls, scene):
+        def auvc_get_cursor_loc(self):
+            area, _, space = common.get_space('IMAGE_EDITOR', 'WINDOW',
+                                              'IMAGE_EDITOR')
+            if compat.check_version(2, 80, 0) < 0:
+                bd_size = common.get_uvimg_editor_board_size(area)
+            else:
+                bd_size = [1.0, 1.0]
+            loc = space.cursor_location
+
+            if bd_size[0] < 0.000001:
+                cx = 0.0
+            else:
+                cx = loc[0] / bd_size[0]
+            if bd_size[1] < 0.000001:
+                cy = 0.0
+            else:
+                cy = loc[1] / bd_size[1]
+
+            self['muv_align_uv_cursor_cursor_loc'] = Vector((cx, cy))
+            return self.get('muv_align_uv_cursor_cursor_loc', (0.0, 0.0))
+
+        def auvc_set_cursor_loc(self, value):
+            self['muv_align_uv_cursor_cursor_loc'] = value
+            area, _, space = common.get_space('IMAGE_EDITOR', 'WINDOW',
+                                              'IMAGE_EDITOR')
+            if compat.check_version(2, 80, 0) < 0:
+                bd_size = common.get_uvimg_editor_board_size(area)
+            else:
+                bd_size = [1.0, 1.0]
+            cx = bd_size[0] * value[0]
+            cy = bd_size[1] * value[1]
+            space.cursor_location = Vector((cx, cy))
+
+        scene.muv_align_uv_cursor_enabled = BoolProperty(
+            name="Align UV Cursor Enabled",
+            description="Align UV Cursor is enabled",
+            default=False
+        )
+
+        scene.muv_align_uv_cursor_cursor_loc = FloatVectorProperty(
+            name="UV Cursor Location",
+            size=2,
+            precision=4,
+            soft_min=-1.0,
+            soft_max=1.0,
+            step=1,
+            default=(0.000, 0.000),
+            get=auvc_get_cursor_loc,
+            set=auvc_set_cursor_loc
+        )
+        scene.muv_align_uv_cursor_align_method = EnumProperty(
+            name="Align Method",
+            description="Align Method",
+            default='TEXTURE',
+            items=[
+                ('TEXTURE', "Texture", "Align to texture"),
+                ('UV', "UV", "Align to UV"),
+                ('UV_SEL', "UV (Selected)", "Align to Selected UV")
+            ]
+        )
+
+        scene.muv_uv_cursor_location_enabled = BoolProperty(
+            name="UV Cursor Location Enabled",
+            description="UV Cursor Location is enabled",
+            default=False
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_align_uv_cursor_enabled
+        del scene.muv_align_uv_cursor_cursor_loc
+        del scene.muv_align_uv_cursor_align_method
+
+        del scene.muv_uv_cursor_location_enabled
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_AlignUVCursor(bpy.types.Operator):
+
+    bl_idname = "uv.muv_ot_align_uv_cursor"
+    bl_label = "Align UV Cursor"
+    bl_description = "Align cursor to the center of UV island"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    position = EnumProperty(
+        items=(
+            ('CENTER', "Center", "Align to Center"),
+            ('LEFT_TOP', "Left Top", "Align to Left Top"),
+            ('LEFT_MIDDLE', "Left Middle", "Align to Left Middle"),
+            ('LEFT_BOTTOM', "Left Bottom", "Align to Left Bottom"),
+            ('MIDDLE_TOP', "Middle Top", "Align to Middle Top"),
+            ('MIDDLE_BOTTOM', "Middle Bottom", "Align to Middle Bottom"),
+            ('RIGHT_TOP', "Right Top", "Align to Right Top"),
+            ('RIGHT_MIDDLE', "Right Middle", "Align to Right Middle"),
+            ('RIGHT_BOTTOM', "Right Bottom", "Align to Right Bottom")
+        ),
+        name="Position",
+        description="Align position",
+        default='CENTER'
+    )
+    base = EnumProperty(
+        items=(
+            ('TEXTURE', "Texture", "Align based on Texture"),
+            ('UV', "UV", "Align to UV"),
+            ('UV_SEL', "UV (Selected)", "Align to Selected UV")
+        ),
+        name="Base",
+        description="Align base",
+        default='TEXTURE'
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        area, _, space = common.get_space('IMAGE_EDITOR', 'WINDOW',
+                                          'IMAGE_EDITOR')
+        if compat.check_version(2, 80, 0) < 0:
+            bd_size = common.get_uvimg_editor_board_size(area)
+        else:
+            bd_size = [1.0, 1.0]
+
+        if self.base == 'UV':
+            obj = context.active_object
+            bm = bmesh.from_edit_mesh(obj.data)
+            if not bm.loops.layers.uv:
+                return None
+            uv_layer = bm.loops.layers.uv.verify()
+
+            max_ = Vector((-10000000.0, -10000000.0))
+            min_ = Vector((10000000.0, 10000000.0))
+            for f in bm.faces:
+                if not f.select:
+                    continue
+                for l in f.loops:
+                    uv = l[uv_layer].uv
+                    max_.x = max(max_.x, uv.x)
+                    max_.y = max(max_.y, uv.y)
+                    min_.x = min(min_.x, uv.x)
+                    min_.y = min(min_.y, uv.y)
+            center = Vector(((max_.x + min_.x) / 2.0, (max_.y + min_.y) / 2.0))
+
+        elif self.base == 'UV_SEL':
+            obj = context.active_object
+            bm = bmesh.from_edit_mesh(obj.data)
+            if not bm.loops.layers.uv:
+                return None
+            uv_layer = bm.loops.layers.uv.verify()
+
+            max_ = Vector((-10000000.0, -10000000.0))
+            min_ = Vector((10000000.0, 10000000.0))
+            for f in bm.faces:
+                if not f.select:
+                    continue
+                for l in f.loops:
+                    if not l[uv_layer].select:
+                        continue
+                    uv = l[uv_layer].uv
+                    max_.x = max(max_.x, uv.x)
+                    max_.y = max(max_.y, uv.y)
+                    min_.x = min(min_.x, uv.x)
+                    min_.y = min(min_.y, uv.y)
+            center = Vector(((max_.x + min_.x) / 2.0, (max_.y + min_.y) / 2.0))
+
+        elif self.base == 'TEXTURE':
+            min_ = Vector((0.0, 0.0))
+            max_ = Vector((1.0, 1.0))
+            center = Vector((0.5, 0.5))
+        else:
+            self.report({'ERROR'}, "Unknown Operation")
+            return {'CANCELLED'}
+
+        if self.position == 'CENTER':
+            cx = center.x
+            cy = center.y
+        elif self.position == 'LEFT_TOP':
+            cx = min_.x
+            cy = max_.y
+        elif self.position == 'LEFT_MIDDLE':
+            cx = min_.x
+            cy = center.y
+        elif self.position == 'LEFT_BOTTOM':
+            cx = min_.x
+            cy = min_.y
+        elif self.position == 'MIDDLE_TOP':
+            cx = center.x
+            cy = max_.y
+        elif self.position == 'MIDDLE_BOTTOM':
+            cx = center.x
+            cy = min_.y
+        elif self.position == 'RIGHT_TOP':
+            cx = max_.x
+            cy = max_.y
+        elif self.position == 'RIGHT_MIDDLE':
+            cx = max_.x
+            cy = center.y
+        elif self.position == 'RIGHT_BOTTOM':
+            cx = max_.x
+            cy = min_.y
+        else:
+            self.report({'ERROR'}, "Unknown Operation")
+            return {'CANCELLED'}
+
+        cx = cx * bd_size[0]
+        cy = cy * bd_size[1]
+
+        space.cursor_location = Vector((cx, cy))
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/copy_paste_uv.py b/magic_uv/op/copy_paste_uv.py
new file mode 100644
index 00000000..fca412ad
--- /dev/null
+++ b/magic_uv/op/copy_paste_uv.py
@@ -0,0 +1,755 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>, Jace Priester"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bmesh
+import bpy.utils
+from bpy.props import (
+    StringProperty,
+    BoolProperty,
+    IntProperty,
+    EnumProperty,
+)
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # only 'VIEW_3D' space is allowed to execute
+    for space in context.area.spaces:
+        if space.type == 'VIEW_3D':
+            break
+    else:
+        return False
+
+    return True
+
+
+def get_copy_uv_layers(ops_obj, bm, uv_map):
+    uv_layers = []
+    if uv_map == "__default":
+        if not bm.loops.layers.uv:
+            ops_obj.report(
+                {'WARNING'}, "Object must have more than one UV map")
+            return None
+        uv_layers.append(bm.loops.layers.uv.verify())
+        ops_obj.report({'INFO'}, "Copy UV coordinate")
+    elif uv_map == "__all":
+        for uv in bm.loops.layers.uv.keys():
+            uv_layers.append(bm.loops.layers.uv[uv])
+        ops_obj.report({'INFO'}, "Copy UV coordinate (UV map: ALL)")
+    else:
+        uv_layers.append(bm.loops.layers.uv[uv_map])
+        ops_obj.report(
+            {'INFO'}, "Copy UV coordinate (UV map:{})".format(uv_map))
+
+    return uv_layers
+
+
+def get_paste_uv_layers(ops_obj, obj, bm, src_info, uv_map):
+    uv_layers = []
+    if uv_map == "__default":
+        if not bm.loops.layers.uv:
+            ops_obj.report(
+                {'WARNING'}, "Object must have more than one UV map")
+            return None
+        uv_layers.append(bm.loops.layers.uv.verify())
+        ops_obj.report({'INFO'}, "Paste UV coordinate")
+    elif uv_map == "__new":
+        new_uv_map = common.create_new_uv_map(obj)
+        if not new_uv_map:
+            ops_obj.report({'WARNING'},
+                           "Reached to the maximum number of UV map")
+            return None
+        uv_layers.append(bm.loops.layers.uv[new_uv_map.name])
+        ops_obj.report(
+            {'INFO'}, "Paste UV coordinate (UV map:{})".format(new_uv_map))
+    elif uv_map == "__all":
+        for src_layer in src_info.keys():
+            if src_layer not in bm.loops.layers.uv.keys():
+                new_uv_map = common.create_new_uv_map(obj, src_layer)
+                if not new_uv_map:
+                    ops_obj.report({'WARNING'},
+                                   "Reached to the maximum number of UV map")
+                    return None
+            uv_layers.append(bm.loops.layers.uv[src_layer])
+        ops_obj.report({'INFO'}, "Paste UV coordinate (UV map: ALL)")
+    else:
+        uv_layers.append(bm.loops.layers.uv[uv_map])
+        ops_obj.report(
+            {'INFO'}, "Paste UV coordinate (UV map:{})".format(uv_map))
+
+    return uv_layers
+
+
+def get_src_face_info(ops_obj, bm, uv_layers, only_select=False):
+    src_info = {}
+    for layer in uv_layers:
+        face_info = []
+        for face in bm.faces:
+            if not only_select or face.select:
+                info = {
+                    "index": face.index,
+                    "uvs": [l[layer].uv.copy() for l in face.loops],
+                    "pin_uvs": [l[layer].pin_uv for l in face.loops],
+                    "seams": [l.edge.seam for l in face.loops],
+                }
+                face_info.append(info)
+        if not face_info:
+            ops_obj.report({'WARNING'}, "No faces are selected")
+            return None
+        src_info[layer.name] = face_info
+
+    return src_info
+
+
+def get_dest_face_info(ops_obj, bm, uv_layers, src_info, strategy,
+                       only_select=False):
+    dest_info = {}
+    for layer in uv_layers:
+        face_info = []
+        for face in bm.faces:
+            if not only_select or face.select:
+                info = {
+                    "index": face.index,
+                    "uvs": [l[layer].uv.copy() for l in face.loops],
+                }
+                face_info.append(info)
+        if not face_info:
+            ops_obj.report({'WARNING'}, "No faces are selected")
+            return None
+        key = list(src_info.keys())[0]
+        src_face_count = len(src_info[key])
+        dest_face_count = len(face_info)
+        if strategy == 'N_N' and src_face_count != dest_face_count:
+            ops_obj.report(
+                {'WARNING'},
+                "Number of selected faces is different from copied" +
+                "(src:{}, dest:{})"
+                .format(src_face_count, dest_face_count))
+            return None
+        dest_info[layer.name] = face_info
+
+    return dest_info
+
+
+def _get_select_history_src_face_info(ops_obj, bm, uv_layers):
+    src_info = {}
+    for layer in uv_layers:
+        face_info = []
+        for hist in bm.select_history:
+            if isinstance(hist, bmesh.types.BMFace) and hist.select:
+                info = {
+                    "index": hist.index,
+                    "uvs": [l[layer].uv.copy() for l in hist.loops],
+                    "pin_uvs": [l[layer].pin_uv for l in hist.loops],
+                    "seams": [l.edge.seam for l in hist.loops],
+                }
+                face_info.append(info)
+        if not face_info:
+            ops_obj.report({'WARNING'}, "No faces are selected")
+            return None
+        src_info[layer.name] = face_info
+
+    return src_info
+
+
+def _get_select_history_dest_face_info(ops_obj, bm, uv_layers, src_info,
+                                       strategy):
+    dest_info = {}
+    for layer in uv_layers:
+        face_info = []
+        for hist in bm.select_history:
+            if isinstance(hist, bmesh.types.BMFace) and hist.select:
+                info = {
+                    "index": hist.index,
+                    "uvs": [l[layer].uv.copy() for l in hist.loops],
+                }
+                face_info.append(info)
+        if not face_info:
+            ops_obj.report({'WARNING'}, "No faces are selected")
+            return None
+        key = list(src_info.keys())[0]
+        src_face_count = len(src_info[key])
+        dest_face_count = len(face_info)
+        if strategy == 'N_N' and src_face_count != dest_face_count:
+            ops_obj.report(
+                {'WARNING'},
+                "Number of selected faces is different from copied" +
+                "(src:{}, dest:{})"
+                .format(src_face_count, dest_face_count))
+            return None
+        dest_info[layer.name] = face_info
+
+    return dest_info
+
+
+def paste_uv(ops_obj, bm, src_info, dest_info, uv_layers, strategy, flip,
+             rotate, copy_seams):
+    for slayer_name, dlayer in zip(src_info.keys(), uv_layers):
+        src_faces = src_info[slayer_name]
+        dest_faces = dest_info[dlayer.name]
+
+        for idx, dinfo in enumerate(dest_faces):
+            sinfo = None
+            if strategy == 'N_N':
+                sinfo = src_faces[idx]
+            elif strategy == 'N_M':
+                sinfo = src_faces[idx % len(src_faces)]
+
+            suv = sinfo["uvs"]
+            spuv = sinfo["pin_uvs"]
+            ss = sinfo["seams"]
+            if len(sinfo["uvs"]) != len(dinfo["uvs"]):
+                ops_obj.report({'WARNING'}, "Some faces are different size")
+                return -1
+
+            suvs_fr = [uv for uv in suv]
+            spuvs_fr = [pin_uv for pin_uv in spuv]
+            ss_fr = [s for s in ss]
+
+            # flip UVs
+            if flip is True:
+                suvs_fr.reverse()
+                spuvs_fr.reverse()
+                ss_fr.reverse()
+
+            # rotate UVs
+            for _ in range(rotate):
+                uv = suvs_fr.pop()
+                pin_uv = spuvs_fr.pop()
+                s = ss_fr.pop()
+                suvs_fr.insert(0, uv)
+                spuvs_fr.insert(0, pin_uv)
+                ss_fr.insert(0, s)
+
+            # paste UVs
+            for l, suv, spuv, ss in zip(bm.faces[dinfo["index"]].loops,
+                                        suvs_fr, spuvs_fr, ss_fr):
+                l[dlayer].uv = suv
+                l[dlayer].pin_uv = spuv
+                if copy_seams is True:
+                    l.edge.seam = ss
+
+    return 0
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "copy_paste_uv"
+
+    @classmethod
+    def init_props(cls, scene):
+        class Props():
+            src_info = None
+
+        scene.muv_props.copy_paste_uv = Props()
+        scene.muv_props.copy_paste_uv_selseq = Props()
+
+        scene.muv_copy_paste_uv_enabled = BoolProperty(
+            name="Copy/Paste UV Enabled",
+            description="Copy/Paste UV is enabled",
+            default=False
+        )
+        scene.muv_copy_paste_uv_copy_seams = BoolProperty(
+            name="Seams",
+            description="Copy Seams",
+            default=True
+        )
+        scene.muv_copy_paste_uv_mode = EnumProperty(
+            items=[
+                ('DEFAULT', "Default", "Default Mode"),
+                ('SEL_SEQ', "Selection Sequence", "Selection Sequence Mode")
+            ],
+            name="Copy/Paste UV Mode",
+            description="Copy/Paste UV Mode",
+            default='DEFAULT'
+        )
+        scene.muv_copy_paste_uv_strategy = EnumProperty(
+            name="Strategy",
+            description="Paste Strategy",
+            items=[
+                ('N_N', 'N:N', 'Number of faces must be equal to source'),
+                ('N_M', 'N:M', 'Number of faces must not be equal to source')
+            ],
+            default='N_M'
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_props.copy_paste_uv
+        del scene.muv_props.copy_paste_uv_selseq
+        del scene.muv_copy_paste_uv_enabled
+        del scene.muv_copy_paste_uv_copy_seams
+        del scene.muv_copy_paste_uv_mode
+        del scene.muv_copy_paste_uv_strategy
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_CopyPasteUV_CopyUV(bpy.types.Operator):
+    """
+    Operation class: Copy UV coordinate
+    """
+
+    bl_idname = "uv.muv_ot_copy_paste_uv_copy_uv"
+    bl_label = "Copy UV"
+    bl_description = "Copy UV coordinate"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    uv_map = StringProperty(default="__default", options={'HIDDEN'})
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        props = context.scene.muv_props.copy_paste_uv
+        obj = context.active_object
+        bm = common.create_bmesh(obj)
+
+        # get UV layer
+        uv_layers = get_copy_uv_layers(self, bm, self.uv_map)
+        if not uv_layers:
+            return {'CANCELLED'}
+
+        # get selected face
+        src_info = get_src_face_info(self, bm, uv_layers, True)
+        if src_info is None:
+            return {'CANCELLED'}
+        props.src_info = src_info
+
+        face_count = len(props.src_info[list(props.src_info.keys())[0]])
+        self.report({'INFO'}, "{} face(s) are copied".format(face_count))
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+class MUV_MT_CopyPasteUV_CopyUV(bpy.types.Menu):
+    """
+    Menu class: Copy UV coordinate
+    """
+
+    bl_idname = "uv.muv_mt_copy_paste_uv_copy_uv"
+    bl_label = "Copy UV (Menu)"
+    bl_description = "Menu of Copy UV coordinate"
+
+    @classmethod
+    def poll(cls, context):
+        return _is_valid_context(context)
+
+    def draw(self, context):
+        layout = self.layout
+        # create sub menu
+        obj = context.active_object
+        bm = common.create_bmesh(obj)
+        uv_maps = bm.loops.layers.uv.keys()
+
+        ops = layout.operator(MUV_OT_CopyPasteUV_CopyUV.bl_idname,
+                              text="[Default]")
+        ops.uv_map = "__default"
+
+        ops = layout.operator(MUV_OT_CopyPasteUV_CopyUV.bl_idname,
+                              text="[All]")
+        ops.uv_map = "__all"
+
+        for m in uv_maps:
+            ops = layout.operator(MUV_OT_CopyPasteUV_CopyUV.bl_idname, text=m)
+            ops.uv_map = m
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_CopyPasteUV_PasteUV(bpy.types.Operator):
+    """
+    Operation class: Paste UV coordinate
+    """
+
+    bl_idname = "uv.muv_ot_copy_paste_uv_paste_uv"
+    bl_label = "Paste UV"
+    bl_description = "Paste UV coordinate"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    uv_map = StringProperty(default="__default", options={'HIDDEN'})
+    strategy = EnumProperty(
+        name="Strategy",
+        description="Paste Strategy",
+        items=[
+            ('N_N', 'N:N', 'Number of faces must be equal to source'),
+            ('N_M', 'N:M', 'Number of faces must not be equal to source')
+        ],
+        default="N_M"
+    )
+    flip_copied_uv = BoolProperty(
+        name="Flip Copied UV",
+        description="Flip Copied UV...",
+        default=False
+    )
+    rotate_copied_uv = IntProperty(
+        default=0,
+        name="Rotate Copied UV",
+        min=0,
+        max=30
+    )
+    copy_seams = BoolProperty(
+        name="Seams",
+        description="Copy Seams",
+        default=True
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        sc = context.scene
+        props = sc.muv_props.copy_paste_uv
+        if not props.src_info:
+            return False
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        props = context.scene.muv_props.copy_paste_uv
+        if not props.src_info:
+            self.report({'WARNING'}, "Need copy UV at first")
+            return {'CANCELLED'}
+        obj = context.active_object
+        bm = common.create_bmesh(obj)
+
+        # get UV layer
+        uv_layers = get_paste_uv_layers(self, obj, bm, props.src_info,
+                                        self.uv_map)
+        if not uv_layers:
+            return {'CANCELLED'}
+
+        # get selected face
+        dest_info = get_dest_face_info(self, bm, uv_layers,
+                                       props.src_info, self.strategy, True)
+        if dest_info is None:
+            return {'CANCELLED'}
+
+        # paste
+        ret = paste_uv(self, bm, props.src_info, dest_info, uv_layers,
+                       self.strategy, self.flip_copied_uv,
+                       self.rotate_copied_uv, self.copy_seams)
+        if ret:
+            return {'CANCELLED'}
+
+        face_count = len(props.src_info[list(dest_info.keys())[0]])
+        self.report({'INFO'}, "{} face(s) are pasted".format(face_count))
+
+        bmesh.update_edit_mesh(obj.data)
+
+        if compat.check_version(2, 80, 0) < 0:
+            if self.copy_seams is True:
+                obj.data.show_edge_seams = True
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+class MUV_MT_CopyPasteUV_PasteUV(bpy.types.Menu):
+    """
+    Menu class: Paste UV coordinate
+    """
+
+    bl_idname = "uv.muv_mt_copy_paste_uv_paste_uv"
+    bl_label = "Paste UV (Menu)"
+    bl_description = "Menu of Paste UV coordinate"
+
+    @classmethod
+    def poll(cls, context):
+        sc = context.scene
+        props = sc.muv_props.copy_paste_uv
+        if not props.src_info:
+            return False
+        return _is_valid_context(context)
+
+    def draw(self, context):
+        sc = context.scene
+        layout = self.layout
+        # create sub menu
+        obj = context.active_object
+        bm = common.create_bmesh(obj)
+        uv_maps = bm.loops.layers.uv.keys()
+
+        ops = layout.operator(MUV_OT_CopyPasteUV_PasteUV.bl_idname,
+                              text="[Default]")
+        ops.uv_map = "__default"
+        ops.copy_seams = sc.muv_copy_paste_uv_copy_seams
+        ops.strategy = sc.muv_copy_paste_uv_strategy
+
+        ops = layout.operator(MUV_OT_CopyPasteUV_PasteUV.bl_idname,
+                              text="[New]")
+        ops.uv_map = "__new"
+        ops.copy_seams = sc.muv_copy_paste_uv_copy_seams
+        ops.strategy = sc.muv_copy_paste_uv_strategy
+
+        ops = layout.operator(MUV_OT_CopyPasteUV_PasteUV.bl_idname,
+                              text="[All]")
+        ops.uv_map = "__all"
+        ops.copy_seams = sc.muv_copy_paste_uv_copy_seams
+        ops.strategy = sc.muv_copy_paste_uv_strategy
+
+        for m in uv_maps:
+            ops = layout.operator(MUV_OT_CopyPasteUV_PasteUV.bl_idname, text=m)
+            ops.uv_map = m
+            ops.copy_seams = sc.muv_copy_paste_uv_copy_seams
+            ops.strategy = sc.muv_copy_paste_uv_strategy
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_CopyPasteUV_SelSeqCopyUV(bpy.types.Operator):
+    """
+    Operation class: Copy UV coordinate by selection sequence
+    """
+
+    bl_idname = "uv.muv_ot_copy_paste_uv_selseq_copy_uv"
+    bl_label = "Copy UV (Selection Sequence)"
+    bl_description = "Copy UV data by selection sequence"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    uv_map = StringProperty(default="__default", options={'HIDDEN'})
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        props = context.scene.muv_props.copy_paste_uv_selseq
+        obj = context.active_object
+        bm = common.create_bmesh(obj)
+
+        # get UV layer
+        uv_layers = get_copy_uv_layers(self, bm, self.uv_map)
+        if not uv_layers:
+            return {'CANCELLED'}
+
+        # get selected face
+        src_info = _get_select_history_src_face_info(self, bm, uv_layers)
+        if src_info is None:
+            return {'CANCELLED'}
+        props.src_info = src_info
+
+        face_count = len(props.src_info[list(props.src_info.keys())[0]])
+        self.report({'INFO'}, "{} face(s) are selected".format(face_count))
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+class MUV_MT_CopyPasteUV_SelSeqCopyUV(bpy.types.Menu):
+    """
+    Menu class: Copy UV coordinate by selection sequence
+    """
+
+    bl_idname = "uv.muv_mt_copy_paste_uv_selseq_copy_uv"
+    bl_label = "Copy UV (Selection Sequence) (Menu)"
+    bl_description = "Menu of Copy UV coordinate by selection sequence"
+
+    @classmethod
+    def poll(cls, context):
+        return _is_valid_context(context)
+
+    def draw(self, context):
+        layout = self.layout
+        obj = context.active_object
+        bm = common.create_bmesh(obj)
+        uv_maps = bm.loops.layers.uv.keys()
+
+        ops = layout.operator(MUV_OT_CopyPasteUV_SelSeqCopyUV.bl_idname,
+                              text="[Default]")
+        ops.uv_map = "__default"
+
+        ops = layout.operator(MUV_OT_CopyPasteUV_SelSeqCopyUV.bl_idname,
+                              text="[All]")
+        ops.uv_map = "__all"
+
+        for m in uv_maps:
+            ops = layout.operator(MUV_OT_CopyPasteUV_SelSeqCopyUV.bl_idname,
+                                  text=m)
+            ops.uv_map = m
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_CopyPasteUV_SelSeqPasteUV(bpy.types.Operator):
+    """
+    Operation class: Paste UV coordinate by selection sequence
+    """
+
+    bl_idname = "uv.muv_ot_copy_paste_uv_selseq_paste_uv"
+    bl_label = "Paste UV (Selection Sequence)"
+    bl_description = "Paste UV coordinate by selection sequence"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    uv_map = StringProperty(default="__default", options={'HIDDEN'})
+    strategy = EnumProperty(
+        name="Strategy",
+        description="Paste Strategy",
+        items=[
+            ('N_N', 'N:N', 'Number of faces must be equal to source'),
+            ('N_M', 'N:M', 'Number of faces must not be equal to source')
+        ],
+        default="N_M"
+    )
+    flip_copied_uv = BoolProperty(
+        name="Flip Copied UV",
+        description="Flip Copied UV...",
+        default=False
+    )
+    rotate_copied_uv = IntProperty(
+        default=0,
+        name="Rotate Copied UV",
+        min=0,
+        max=30
+    )
+    copy_seams = BoolProperty(
+        name="Seams",
+        description="Copy Seams",
+        default=True
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        sc = context.scene
+        props = sc.muv_props.copy_paste_uv_selseq
+        if not props.src_info:
+            return False
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        props = context.scene.muv_props.copy_paste_uv_selseq
+        if not props.src_info:
+            self.report({'WARNING'}, "Need copy UV at first")
+            return {'CANCELLED'}
+        obj = context.active_object
+        bm = common.create_bmesh(obj)
+
+        # get UV layer
+        uv_layers = get_paste_uv_layers(self, obj, bm, props.src_info,
+                                        self.uv_map)
+        if not uv_layers:
+            return {'CANCELLED'}
+
+        # get selected face
+        dest_info = _get_select_history_dest_face_info(self, bm, uv_layers,
+                                                       props.src_info,
+                                                       self.strategy)
+        if dest_info is None:
+            return {'CANCELLED'}
+
+        # paste
+        ret = paste_uv(self, bm, props.src_info, dest_info, uv_layers,
+                       self.strategy, self.flip_copied_uv,
+                       self.rotate_copied_uv, self.copy_seams)
+        if ret:
+            return {'CANCELLED'}
+
+        face_count = len(props.src_info[list(dest_info.keys())[0]])
+        self.report({'INFO'}, "{} face(s) are pasted".format(face_count))
+
+        bmesh.update_edit_mesh(obj.data)
+
+        if compat.check_version(2, 80, 0) < 0:
+            if self.copy_seams is True:
+                obj.data.show_edge_seams = True
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+class MUV_MT_CopyPasteUV_SelSeqPasteUV(bpy.types.Menu):
+    """
+    Menu class: Paste UV coordinate by selection sequence
+    """
+
+    bl_idname = "uv.muv_mt_copy_paste_uv_selseq_paste_uv"
+    bl_label = "Paste UV (Selection Sequence) (Menu)"
+    bl_description = "Menu of Paste UV coordinate by selection sequence"
+
+    @classmethod
+    def poll(cls, context):
+        sc = context.scene
+        props = sc.muv_props.copy_paste_uv_selseq
+        if not props.src_uvs or not props.src_pin_uvs:
+            return False
+        return _is_valid_context(context)
+
+    def draw(self, context):
+        sc = context.scene
+        layout = self.layout
+        # create sub menu
+        obj = context.active_object
+        bm = common.create_bmesh(obj)
+        uv_maps = bm.loops.layers.uv.keys()
+
+        ops = layout.operator(MUV_OT_CopyPasteUV_SelSeqPasteUV.bl_idname,
+                              text="[Default]")
+        ops.uv_map = "__default"
+        ops.copy_seams = sc.muv_copy_paste_uv_copy_seams
+        ops.strategy = sc.muv_copy_paste_uv_strategy
+
+        ops = layout.operator(MUV_OT_CopyPasteUV_SelSeqPasteUV.bl_idname,
+                              text="[New]")
+        ops.uv_map = "__new"
+        ops.copy_seams = sc.muv_copy_paste_uv_copy_seams
+        ops.strategy = sc.muv_copy_paste_uv_strategy
+
+        ops = layout.operator(MUV_OT_CopyPasteUV_SelSeqPasteUV.bl_idname,
+                              text="[All]")
+        ops.uv_map = "__all"
+        ops.copy_seams = sc.muv_copy_paste_uv_copy_seams
+        ops.strategy = sc.muv_copy_paste_uv_strategy
+
+        for m in uv_maps:
+            ops = layout.operator(MUV_OT_CopyPasteUV_SelSeqPasteUV.bl_idname,
+                                  text=m)
+            ops.uv_map = m
+            ops.copy_seams = sc.muv_copy_paste_uv_copy_seams
+            ops.strategy = sc.muv_copy_paste_uv_strategy
diff --git a/magic_uv/op/copy_paste_uv_object.py b/magic_uv/op/copy_paste_uv_object.py
new file mode 100644
index 00000000..23ff412b
--- /dev/null
+++ b/magic_uv/op/copy_paste_uv_object.py
@@ -0,0 +1,306 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bmesh
+import bpy
+from bpy.props import (
+    StringProperty,
+    BoolProperty,
+)
+
+from .copy_paste_uv import (
+    get_copy_uv_layers,
+    get_src_face_info,
+    get_paste_uv_layers,
+    get_dest_face_info,
+    paste_uv,
+)
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only object mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'OBJECT':
+        return False
+
+    # only 'VIEW_3D' space is allowed to execute
+    for space in context.area.spaces:
+        if space.type == 'VIEW_3D':
+            break
+    else:
+        return False
+
+    return True
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "copy_paste_uv_object"
+
+    @classmethod
+    def init_props(cls, scene):
+        class Props():
+            src_info = None
+
+        scene.muv_props.copy_paste_uv_object = Props()
+
+        scene.muv_copy_paste_uv_object_copy_seams = BoolProperty(
+            name="Seams",
+            description="Copy Seams",
+            default=True
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_props.copy_paste_uv_object
+        del scene.muv_copy_paste_uv_object_copy_seams
+
+
+def memorize_view_3d_mode(fn):
+    def __memorize_view_3d_mode(self, context):
+        mode_orig = bpy.context.object.mode
+        result = fn(self, context)
+        bpy.ops.object.mode_set(mode=mode_orig)
+        return result
+    return __memorize_view_3d_mode
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_CopyPasteUVObject_CopyUV(bpy.types.Operator):
+    """
+    Operation class: Copy UV coordinate among objects
+    """
+
+    bl_idname = "object.muv_ot_copy_paste_uv_object_copy_uv"
+    bl_label = "Copy UV (Among Objects)"
+    bl_description = "Copy UV coordinate (Among Objects)"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    uv_map = StringProperty(default="__default", options={'HIDDEN'})
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    @memorize_view_3d_mode
+    def execute(self, context):
+        props = context.scene.muv_props.copy_paste_uv_object
+        bpy.ops.object.mode_set(mode='EDIT')
+        obj = context.active_object
+        bm = common.create_bmesh(obj)
+
+        # get UV layer
+        uv_layers = get_copy_uv_layers(self, bm, self.uv_map)
+        if not uv_layers:
+            return {'CANCELLED'}
+
+        # get selected face
+        src_info = get_src_face_info(self, bm, uv_layers)
+        if src_info is None:
+            return {'CANCELLED'}
+        props.src_info = src_info
+
+        self.report({'INFO'},
+                    "{}'s UV coordinates are copied".format(obj.name))
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+class MUV_MT_CopyPasteUVObject_CopyUV(bpy.types.Menu):
+    """
+    Menu class: Copy UV coordinate among objects
+    """
+
+    bl_idname = "object.muv_mt_copy_paste_uv_object_copy_uv"
+    bl_label = "Copy UV (Among Objects) (Menu)"
+    bl_description = "Menu of Copy UV coordinate (Among Objects)"
+
+    @classmethod
+    def poll(cls, context):
+        return _is_valid_context(context)
+
+    def draw(self, _):
+        layout = self.layout
+        # create sub menu
+        uv_maps = compat.get_object_uv_layers(bpy.context.active_object).keys()
+
+        ops = layout.operator(MUV_OT_CopyPasteUVObject_CopyUV.bl_idname,
+                              text="[Default]")
+        ops.uv_map = "__default"
+
+        ops = layout.operator(MUV_OT_CopyPasteUVObject_CopyUV.bl_idname,
+                              text="[All]")
+        ops.uv_map = "__all"
+
+        for m in uv_maps:
+            ops = layout.operator(MUV_OT_CopyPasteUVObject_CopyUV.bl_idname,
+                                  text=m)
+            ops.uv_map = m
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_CopyPasteUVObject_PasteUV(bpy.types.Operator):
+    """
+    Operation class: Paste UV coordinate among objects
+    """
+
+    bl_idname = "object.muv_ot_copy_paste_uv_object_paste_uv"
+    bl_label = "Paste UV (Among Objects)"
+    bl_description = "Paste UV coordinate (Among Objects)"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    uv_map = StringProperty(default="__default", options={'HIDDEN'})
+    copy_seams = BoolProperty(
+        name="Seams",
+        description="Copy Seams",
+        default=True
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        sc = context.scene
+        props = sc.muv_props.copy_paste_uv_object
+        if not props.src_info:
+            return False
+        return _is_valid_context(context)
+
+    @memorize_view_3d_mode
+    def execute(self, context):
+        props = context.scene.muv_props.copy_paste_uv_object
+        if not props.src_info:
+            self.report({'WARNING'}, "Need copy UV at first")
+            return {'CANCELLED'}
+
+        for o in bpy.data.objects:
+            if not compat.object_has_uv_layers(o):
+                continue
+            if not compat.get_object_select(o):
+                continue
+
+            bpy.ops.object.mode_set(mode='OBJECT')
+            compat.set_active_object(o)
+            bpy.ops.object.mode_set(mode='EDIT')
+
+            obj = context.active_object
+            bm = common.create_bmesh(obj)
+
+            # get UV layer
+            uv_layers = get_paste_uv_layers(self, obj, bm, props.src_info,
+                                            self.uv_map)
+            if not uv_layers:
+                return {'CANCELLED'}
+
+            # get selected face
+            dest_info = get_dest_face_info(self, bm, uv_layers,
+                                           props.src_info, 'N_N')
+            if dest_info is None:
+                return {'CANCELLED'}
+
+            # paste
+            ret = paste_uv(self, bm, props.src_info, dest_info, uv_layers,
+                           'N_N', 0, 0, self.copy_seams)
+            if ret:
+                return {'CANCELLED'}
+
+            bmesh.update_edit_mesh(obj.data)
+
+            if compat.check_version(2, 80, 0) < 0:
+                if self.copy_seams is True:
+                    obj.data.show_edge_seams = True
+
+            self.report(
+                {'INFO'}, "{}'s UV coordinates are pasted".format(obj.name))
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+class MUV_MT_CopyPasteUVObject_PasteUV(bpy.types.Menu):
+    """
+    Menu class: Paste UV coordinate among objects
+    """
+
+    bl_idname = "object.muv_mt_copy_paste_uv_object_paste_uv"
+    bl_label = "Paste UV (Among Objects) (Menu)"
+    bl_description = "Menu of Paste UV coordinate (Among Objects)"
+
+    @classmethod
+    def poll(cls, context):
+        sc = context.scene
+        props = sc.muv_props.copy_paste_uv_object
+        if not props.src_info:
+            return False
+        return _is_valid_context(context)
+
+    def draw(self, context):
+        sc = context.scene
+        layout = self.layout
+        # create sub menu
+        uv_maps = []
+        for obj in bpy.data.objects:
+            if not compat.object_has_uv_layers(obj):
+                continue
+            if not compat.get_object_select(obj):
+                continue
+            uv_maps.extend(compat.get_object_uv_layers(obj).keys())
+
+        ops = layout.operator(MUV_OT_CopyPasteUVObject_PasteUV.bl_idname,
+                              text="[Default]")
+        ops.uv_map = "__default"
+        ops.copy_seams = sc.muv_copy_paste_uv_object_copy_seams
+
+        ops = layout.operator(MUV_OT_CopyPasteUVObject_PasteUV.bl_idname,
+                              text="[New]")
+        ops.uv_map = "__new"
+        ops.copy_seams = sc.muv_copy_paste_uv_object_copy_seams
+
+        ops = layout.operator(MUV_OT_CopyPasteUVObject_PasteUV.bl_idname,
+                              text="[All]")
+        ops.uv_map = "__all"
+        ops.copy_seams = sc.muv_copy_paste_uv_object_copy_seams
+
+        for m in uv_maps:
+            ops = layout.operator(MUV_OT_CopyPasteUVObject_PasteUV.bl_idname,
+                                  text=m)
+            ops.uv_map = m
+            ops.copy_seams = sc.muv_copy_paste_uv_object_copy_seams
diff --git a/magic_uv/op/copy_paste_uv_uvedit.py b/magic_uv/op/copy_paste_uv_uvedit.py
new file mode 100644
index 00000000..b448f866
--- /dev/null
+++ b/magic_uv/op/copy_paste_uv_uvedit.py
@@ -0,0 +1,198 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "imdjs, Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import math
+from math import atan2, sin, cos
+
+import bpy
+import bmesh
+from mathutils import Vector
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # 'IMAGE_EDITOR' and 'VIEW_3D' space is allowed to execute.
+    # If 'View_3D' space is not allowed, you can't find option in Tool-Shelf
+    # after the execution
+    for space in context.area.spaces:
+        if (space.type == 'IMAGE_EDITOR') or (space.type == 'VIEW_3D'):
+            break
+    else:
+        return False
+
+    return True
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "copy_paste_uv_uvedit"
+
+    @classmethod
+    def init_props(cls, scene):
+        class Props():
+            src_uvs = None
+
+        scene.muv_props.copy_paste_uv_uvedit = Props()
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_props.copy_paste_uv_uvedit
+
+
+@BlClassRegistry()
+class MUV_OT_CopyPasteUVUVEdit_CopyUV(bpy.types.Operator):
+    """
+    Operation class: Copy UV coordinate on UV/Image Editor
+    """
+
+    bl_idname = "uv.muv_ot_copy_paste_uv_uvedit_copy_uv"
+    bl_label = "Copy UV (UV/Image Editor)"
+    bl_description = "Copy UV coordinate (only selected in UV/Image Editor)"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        props = context.scene.muv_props.copy_paste_uv_uvedit
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        uv_layer = bm.loops.layers.uv.verify()
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+
+        props.src_uvs = []
+        for face in bm.faces:
+            if not face.select:
+                continue
+            skip = False
+            for l in face.loops:
+                if not l[uv_layer].select:
+                    skip = True
+                    break
+            if skip:
+                continue
+            props.src_uvs.append([l[uv_layer].uv.copy() for l in face.loops])
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+class MUV_OT_CopyPasteUVUVEdit_PasteUV(bpy.types.Operator):
+    """
+    Operation class: Paste UV coordinate on UV/Image Editor
+    """
+
+    bl_idname = "uv.muv_ot_copy_paste_uv_uvedit_paste_uv"
+    bl_label = "Paste UV (UV/Image Editor)"
+    bl_description = "Paste UV coordinate (only selected in UV/Image Editor)"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        sc = context.scene
+        props = sc.muv_props.copy_paste_uv_uvedit
+        if not props.src_uvs:
+            return False
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        props = context.scene.muv_props.copy_paste_uv_uvedit
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        uv_layer = bm.loops.layers.uv.verify()
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+
+        dest_uvs = []
+        dest_face_indices = []
+        for face in bm.faces:
+            if not face.select:
+                continue
+            skip = False
+            for l in face.loops:
+                if not l[uv_layer].select:
+                    skip = True
+                    break
+            if skip:
+                continue
+            dest_face_indices.append(face.index)
+            uvs = [l[uv_layer].uv.copy() for l in face.loops]
+            dest_uvs.append(uvs)
+
+        for suvs, duvs in zip(props.src_uvs, dest_uvs):
+            src_diff = suvs[1] - suvs[0]
+            dest_diff = duvs[1] - duvs[0]
+
+            src_base = suvs[0]
+            dest_base = duvs[0]
+
+            src_rad = atan2(src_diff.y, src_diff.x)
+            dest_rad = atan2(dest_diff.y, dest_diff.x)
+            if src_rad < dest_rad:
+                radian = dest_rad - src_rad
+            elif src_rad > dest_rad:
+                radian = math.pi * 2 - (src_rad - dest_rad)
+            else:       # src_rad == dest_rad
+                radian = 0.0
+
+            ratio = dest_diff.length / src_diff.length
+            break
+
+        for suvs, fidx in zip(props.src_uvs, dest_face_indices):
+            for l, suv in zip(bm.faces[fidx].loops, suvs):
+                base = suv - src_base
+                radian_ref = atan2(base.y, base.x)
+                radian_fin = (radian + radian_ref)
+                length = base.length
+                turn = Vector((length * cos(radian_fin),
+                               length * sin(radian_fin)))
+                target_uv = Vector((turn.x * ratio, turn.y * ratio)) + \
+                    dest_base
+                l[uv_layer].uv = target_uv
+
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/flip_rotate_uv.py b/magic_uv/op/flip_rotate_uv.py
new file mode 100644
index 00000000..c4c05169
--- /dev/null
+++ b/magic_uv/op/flip_rotate_uv.py
@@ -0,0 +1,232 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+import bmesh
+from bpy.props import (
+    BoolProperty,
+    IntProperty,
+)
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # only 'VIEW_3D' space is allowed to execute
+    for space in context.area.spaces:
+        if space.type == 'VIEW_3D':
+            break
+    else:
+        return False
+
+    return True
+
+
+def _get_uv_layer(ops_obj, bm):
+    # get UV layer
+    if not bm.loops.layers.uv:
+        ops_obj.report({'WARNING'}, "Object must have more than one UV map")
+        return None
+    uv_layer = bm.loops.layers.uv.verify()
+
+    return uv_layer
+
+
+def _get_src_face_info(ops_obj, bm, uv_layers, only_select=False):
+    src_info = {}
+    for layer in uv_layers:
+        face_info = []
+        for face in bm.faces:
+            if not only_select or face.select:
+                info = {
+                    "index": face.index,
+                    "uvs": [l[layer].uv.copy() for l in face.loops],
+                    "pin_uvs": [l[layer].pin_uv for l in face.loops],
+                    "seams": [l.edge.seam for l in face.loops],
+                }
+                face_info.append(info)
+        if not face_info:
+            ops_obj.report({'WARNING'}, "No faces are selected")
+            return None
+        src_info[layer.name] = face_info
+
+    return src_info
+
+
+def _paste_uv(ops_obj, bm, src_info, dest_info, uv_layers, strategy, flip,
+              rotate, copy_seams):
+    for slayer_name, dlayer in zip(src_info.keys(), uv_layers):
+        src_faces = src_info[slayer_name]
+        dest_faces = dest_info[dlayer.name]
+
+        for idx, dinfo in enumerate(dest_faces):
+            sinfo = None
+            if strategy == 'N_N':
+                sinfo = src_faces[idx]
+            elif strategy == 'N_M':
+                sinfo = src_faces[idx % len(src_faces)]
+
+            suv = sinfo["uvs"]
+            spuv = sinfo["pin_uvs"]
+            ss = sinfo["seams"]
+            if len(sinfo["uvs"]) != len(dinfo["uvs"]):
+                ops_obj.report({'WARNING'}, "Some faces are different size")
+                return -1
+
+            suvs_fr = [uv for uv in suv]
+            spuvs_fr = [pin_uv for pin_uv in spuv]
+            ss_fr = [s for s in ss]
+
+            # flip UVs
+            if flip is True:
+                suvs_fr.reverse()
+                spuvs_fr.reverse()
+                ss_fr.reverse()
+
+            # rotate UVs
+            for _ in range(rotate):
+                uv = suvs_fr.pop()
+                pin_uv = spuvs_fr.pop()
+                s = ss_fr.pop()
+                suvs_fr.insert(0, uv)
+                spuvs_fr.insert(0, pin_uv)
+                ss_fr.insert(0, s)
+
+            # paste UVs
+            for l, suv, spuv, ss in zip(bm.faces[dinfo["index"]].loops,
+                                        suvs_fr, spuvs_fr, ss_fr):
+                l[dlayer].uv = suv
+                l[dlayer].pin_uv = spuv
+                if copy_seams is True:
+                    l.edge.seam = ss
+
+    return 0
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "flip_rotate_uv"
+
+    @classmethod
+    def init_props(cls, scene):
+        scene.muv_flip_rotate_uv_enabled = BoolProperty(
+            name="Flip/Rotate UV Enabled",
+            description="Flip/Rotate UV is enabled",
+            default=False
+        )
+        scene.muv_flip_rotate_uv_seams = BoolProperty(
+            name="Seams",
+            description="Seams",
+            default=True
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_flip_rotate_uv_enabled
+        del scene.muv_flip_rotate_uv_seams
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_FlipRotate(bpy.types.Operator):
+    """
+    Operation class: Flip and Rotate UV coordinate
+    """
+
+    bl_idname = "uv.muv_ot_flip_rotate_uv"
+    bl_label = "Flip/Rotate UV"
+    bl_description = "Flip/Rotate UV coordinate"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    flip = BoolProperty(
+        name="Flip UV",
+        description="Flip UV...",
+        default=False
+    )
+    rotate = IntProperty(
+        default=0,
+        name="Rotate UV",
+        min=0,
+        max=30
+    )
+    seams = BoolProperty(
+        name="Seams",
+        description="Seams",
+        default=True
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        self.report({'INFO'}, "Flip/Rotate UV")
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+
+        # get UV layer
+        uv_layer = _get_uv_layer(self, bm)
+        if not uv_layer:
+            return {'CANCELLED'}
+
+        # get selected face
+        src_info = _get_src_face_info(self, bm, [uv_layer], True)
+        if not src_info:
+            return {'CANCELLED'}
+
+        face_count = len(src_info[list(src_info.keys())[0]])
+        self.report({'INFO'}, "{} face(s) are selected".format(face_count))
+
+        # paste
+        ret = _paste_uv(self, bm, src_info, src_info, [uv_layer], 'N_N',
+                        self.flip, self.rotate, self.seams)
+        if ret:
+            return {'CANCELLED'}
+
+        bmesh.update_edit_mesh(obj.data)
+
+        if compat.check_version(2, 80, 0) < 0:
+            if self.seams is True:
+                obj.data.show_edge_seams = True
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/mirror_uv.py b/magic_uv/op/mirror_uv.py
new file mode 100644
index 00000000..fb98bb05
--- /dev/null
+++ b/magic_uv/op/mirror_uv.py
@@ -0,0 +1,215 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Keith (Wahooney) Boshoff, Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+from bpy.props import (
+    EnumProperty,
+    FloatProperty,
+    BoolProperty,
+)
+import bmesh
+from mathutils import Vector
+
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+from .. import common
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # only 'VIEW_3D' space is allowed to execute
+    for space in context.area.spaces:
+        if space.type == 'VIEW_3D':
+            break
+    else:
+        return False
+
+    return True
+
+
+def _is_vector_similar(v1, v2, error):
+    """
+    Check if two vectors are similar, within an error threshold
+    """
+    within_err_x = abs(v2.x - v1.x) < error
+    within_err_y = abs(v2.y - v1.y) < error
+    within_err_z = abs(v2.z - v1.z) < error
+
+    return within_err_x and within_err_y and within_err_z
+
+
+def _mirror_uvs(uv_layer, src, dst, axis, error):
+    """
+    Copy UV coordinates from one UV face to another
+    """
+    for sl in src.loops:
+        suv = sl[uv_layer].uv.copy()
+        svco = sl.vert.co.copy()
+        for dl in dst.loops:
+            dvco = dl.vert.co.copy()
+            if axis == 'X':
+                dvco.x = -dvco.x
+            elif axis == 'Y':
+                dvco.y = -dvco.y
+            elif axis == 'Z':
+                dvco.z = -dvco.z
+
+            if _is_vector_similar(svco, dvco, error):
+                dl[uv_layer].uv = suv.copy()
+
+
+def _get_face_center(face):
+    """
+    Get center coordinate of the face
+    """
+    center = Vector((0.0, 0.0, 0.0))
+    for v in face.verts:
+        center = center + v.co
+
+    return center / len(face.verts)
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "mirror_uv"
+
+    @classmethod
+    def init_props(cls, scene):
+        scene.muv_mirror_uv_enabled = BoolProperty(
+            name="Mirror UV Enabled",
+            description="Mirror UV is enabled",
+            default=False
+        )
+        scene.muv_mirror_uv_axis = EnumProperty(
+            items=[
+                ('X', "X", "Mirror Along X axis"),
+                ('Y', "Y", "Mirror Along Y axis"),
+                ('Z', "Z", "Mirror Along Z axis")
+            ],
+            name="Axis",
+            description="Mirror Axis",
+            default='X'
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_mirror_uv_enabled
+        del scene.muv_mirror_uv_axis
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_MirrorUV(bpy.types.Operator):
+    """
+    Operation class: Mirror UV
+    """
+
+    bl_idname = "uv.muv_ot_mirror_uv"
+    bl_label = "Mirror UV"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    axis = EnumProperty(
+        items=(
+            ('X', "X", "Mirror Along X axis"),
+            ('Y', "Y", "Mirror Along Y axis"),
+            ('Z', "Z", "Mirror Along Z axis")
+        ),
+        name="Axis",
+        description="Mirror Axis",
+        default='X'
+    )
+    error = FloatProperty(
+        name="Error",
+        description="Error threshold",
+        default=0.001,
+        min=0.0,
+        max=100.0,
+        soft_min=0.0,
+        soft_max=1.0
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+
+        error = self.error
+        axis = self.axis
+
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+        if not bm.loops.layers.uv:
+            self.report({'WARNING'},
+                        "Object must have more than one UV map")
+            return {'CANCELLED'}
+        uv_layer = bm.loops.layers.uv.verify()
+
+        faces = [f for f in bm.faces if f.select]
+        for f_dst in faces:
+            count = len(f_dst.verts)
+            for f_src in bm.faces:
+                # check if this is a candidate to do mirror UV
+                if f_src.index == f_dst.index:
+                    continue
+                if count != len(f_src.verts):
+                    continue
+
+                # test if the vertices x values are the same sign
+                dst = _get_face_center(f_dst)
+                src = _get_face_center(f_src)
+                if (dst.x > 0 and src.x > 0) or (dst.x < 0 and src.x < 0):
+                    continue
+
+                # invert source axis
+                if axis == 'X':
+                    src.x = -src.x
+                elif axis == 'Y':
+                    src.y = -src.z
+                elif axis == 'Z':
+                    src.z = -src.z
+
+                # do mirror UV
+                if _is_vector_similar(dst, src, error):
+                    _mirror_uvs(uv_layer, f_src, f_dst, self.axis, self.error)
+
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/move_uv.py b/magic_uv/op/move_uv.py
new file mode 100644
index 00000000..be019e9f
--- /dev/null
+++ b/magic_uv/op/move_uv.py
@@ -0,0 +1,185 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "kgeogeo, mem, Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+from bpy.props import BoolProperty
+import bmesh
+from mathutils import Vector
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # only 'VIEW_3D' space is allowed to execute
+    for space in context.area.spaces:
+        if space.type == 'VIEW_3D':
+            break
+    else:
+        return False
+
+    return True
+
+
+def _find_uv(context):
+    bm = bmesh.from_edit_mesh(context.object.data)
+    topology_dict = []
+    uvs = []
+    active_uv = bm.loops.layers.uv.active
+    for fidx, f in enumerate(bm.faces):
+        for vidx, v in enumerate(f.verts):
+            if v.select:
+                uvs.append(f.loops[vidx][active_uv].uv.copy())
+                topology_dict.append([fidx, vidx])
+
+    return topology_dict, uvs
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "move_uv"
+
+    @classmethod
+    def init_props(cls, scene):
+        scene.muv_move_uv_enabled = BoolProperty(
+            name="Move UV Enabled",
+            description="Move UV is enabled",
+            default=False
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_move_uv_enabled
+
+
+@BlClassRegistry()
+class MUV_OT_MoveUV(bpy.types.Operator):
+    """
+    Operator class: Move UV
+    """
+
+    bl_idname = "uv.muv_ot_move_uv"
+    bl_label = "Move UV"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    __running = False
+
+    def __init__(self):
+        self.__topology_dict = []
+        self.__prev_mouse = Vector((0.0, 0.0))
+        self.__offset_uv = Vector((0.0, 0.0))
+        self.__prev_offset_uv = Vector((0.0, 0.0))
+        self.__first_time = True
+        self.__ini_uvs = []
+        self.__operating = False
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return False
+        if cls.is_running(context):
+            return False
+        return _is_valid_context(context)
+
+    @classmethod
+    def is_running(cls, _):
+        return cls.__running
+
+    def modal(self, context, event):
+        if self.__first_time is True:
+            self.__prev_mouse = Vector((
+                event.mouse_region_x, event.mouse_region_y))
+            self.__first_time = False
+            return {'RUNNING_MODAL'}
+
+        # move UV
+        div = 10000
+        self.__offset_uv += Vector((
+            (event.mouse_region_x - self.__prev_mouse.x) / div,
+            (event.mouse_region_y - self.__prev_mouse.y) / div))
+        ouv = self.__offset_uv
+        pouv = self.__prev_offset_uv
+        vec = Vector((ouv.x - ouv.y, ouv.x + ouv.y))
+        dv = vec - pouv
+        self.__prev_offset_uv = vec
+        self.__prev_mouse = Vector((
+            event.mouse_region_x, event.mouse_region_y))
+
+        # check if operation is started
+        if not self.__operating:
+            if event.type == 'LEFTMOUSE' and event.value == 'RELEASE':
+                self.__operating = True
+            return {'RUNNING_MODAL'}
+
+        # update UV
+        obj = context.object
+        bm = bmesh.from_edit_mesh(obj.data)
+        active_uv = bm.loops.layers.uv.active
+        for fidx, vidx in self.__topology_dict:
+            l = bm.faces[fidx].loops[vidx]
+            l[active_uv].uv = l[active_uv].uv + dv
+        bmesh.update_edit_mesh(obj.data)
+
+        # check mouse preference
+        confirm_btn = 'LEFTMOUSE'
+        cancel_btn = 'RIGHTMOUSE'
+
+        # cancelled
+        if event.type == cancel_btn and event.value == 'PRESS':
+            for (fidx, vidx), uv in zip(self.__topology_dict, self.__ini_uvs):
+                bm.faces[fidx].loops[vidx][active_uv].uv = uv
+            MUV_OT_MoveUV.__running = False
+            return {'FINISHED'}
+        # confirmed
+        if event.type == confirm_btn and event.value == 'PRESS':
+            MUV_OT_MoveUV.__running = False
+            return {'FINISHED'}
+
+        return {'RUNNING_MODAL'}
+
+    def execute(self, context):
+        MUV_OT_MoveUV.__running = True
+        self.__operating = False
+        self.__first_time = True
+
+        context.window_manager.modal_handler_add(self)
+        self.__topology_dict, self.__ini_uvs = _find_uv(context)
+
+        if context.area:
+            context.area.tag_redraw()
+
+        return {'RUNNING_MODAL'}
diff --git a/magic_uv/op/pack_uv.py b/magic_uv/op/pack_uv.py
new file mode 100644
index 00000000..4eb3841d
--- /dev/null
+++ b/magic_uv/op/pack_uv.py
@@ -0,0 +1,282 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+from math import fabs
+
+import bpy
+from bpy.props import (
+    FloatProperty,
+    FloatVectorProperty,
+    BoolProperty,
+)
+import bmesh
+import mathutils
+from mathutils import Vector
+
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+from .. import common
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # 'IMAGE_EDITOR' and 'VIEW_3D' space is allowed to execute.
+    # If 'View_3D' space is not allowed, you can't find option in Tool-Shelf
+    # after the execution
+    for space in context.area.spaces:
+        if (space.type == 'IMAGE_EDITOR') or (space.type == 'VIEW_3D'):
+            break
+    else:
+        return False
+
+    return True
+
+
+def _sort_island_faces(kd, uvs, isl1, isl2):
+    """
+    Sort faces in island
+    """
+
+    sorted_faces = []
+    for f in isl1['sorted']:
+        _, idx, _ = kd.find(
+            Vector((f['ave_uv'].x, f['ave_uv'].y, 0.0)))
+        sorted_faces.append(isl2['faces'][uvs[idx]['face_idx']])
+    return sorted_faces
+
+
+def _group_island(island_info, allowable_center_deviation,
+                  allowable_size_deviation):
+    """
+    Group island
+    """
+
+    num_group = 0
+    while True:
+        # search islands which is not parsed yet
+        isl_1 = None
+        for isl_1 in island_info:
+            if isl_1['group'] == -1:
+                break
+        else:
+            break   # all faces are parsed
+        if isl_1 is None:
+            break
+        isl_1['group'] = num_group
+        isl_1['sorted'] = isl_1['faces']
+
+        # search same island
+        for isl_2 in island_info:
+            if isl_2['group'] == -1:
+                dcx = isl_2['center'].x - isl_1['center'].x
+                dcy = isl_2['center'].y - isl_1['center'].y
+                dsx = isl_2['size'].x - isl_1['size'].x
+                dsy = isl_2['size'].y - isl_1['size'].y
+                center_x_matched = (
+                    fabs(dcx) < allowable_center_deviation[0]
+                )
+                center_y_matched = (
+                    fabs(dcy) < allowable_center_deviation[1]
+                )
+                size_x_matched = (
+                    fabs(dsx) < allowable_size_deviation[0]
+                )
+                size_y_matched = (
+                    fabs(dsy) < allowable_size_deviation[1]
+                )
+                center_matched = center_x_matched and center_y_matched
+                size_matched = size_x_matched and size_y_matched
+                num_uv_matched = (isl_2['num_uv'] == isl_1['num_uv'])
+                # are islands have same?
+                if center_matched and size_matched and num_uv_matched:
+                    isl_2['group'] = num_group
+                    kd = mathutils.kdtree.KDTree(len(isl_2['faces']))
+                    uvs = [
+                        {
+                            'uv': Vector(
+                                (f['ave_uv'].x, f['ave_uv'].y, 0.0)
+                            ),
+                            'face_idx': fidx
+                        } for fidx, f in enumerate(isl_2['faces'])
+                    ]
+                    for i, uv in enumerate(uvs):
+                        kd.insert(uv['uv'], i)
+                    kd.balance()
+                    # sort faces for copy/paste UV
+                    isl_2['sorted'] = _sort_island_faces(kd, uvs, isl_1, isl_2)
+        num_group = num_group + 1
+
+    return num_group
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "pack_uv"
+
+    @classmethod
+    def init_props(cls, scene):
+        scene.muv_pack_uv_enabled = BoolProperty(
+            name="Pack UV Enabled",
+            description="Pack UV is enabled",
+            default=False
+        )
+        scene.muv_pack_uv_allowable_center_deviation = FloatVectorProperty(
+            name="Allowable Center Deviation",
+            description="Allowable center deviation to judge same UV island",
+            min=0.000001,
+            max=0.1,
+            default=(0.001, 0.001),
+            size=2
+        )
+        scene.muv_pack_uv_allowable_size_deviation = FloatVectorProperty(
+            name="Allowable Size Deviation",
+            description="Allowable sizse deviation to judge same UV island",
+            min=0.000001,
+            max=0.1,
+            default=(0.001, 0.001),
+            size=2
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_pack_uv_enabled
+        del scene.muv_pack_uv_allowable_center_deviation
+        del scene.muv_pack_uv_allowable_size_deviation
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_PackUV(bpy.types.Operator):
+    """
+    Operation class: Pack UV with same UV islands are integrated
+    Island matching algorithm
+     - Same center of UV island
+     - Same size of UV island
+     - Same number of UV
+    """
+
+    bl_idname = "uv.muv_ot_pack_uv"
+    bl_label = "Pack UV"
+    bl_description = "Pack UV (Same UV Islands are integrated)"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    rotate = BoolProperty(
+        name="Rotate",
+        description="Rotate option used by default pack UV function",
+        default=False)
+    margin = FloatProperty(
+        name="Margin",
+        description="Margin used by default pack UV function",
+        min=0,
+        max=1,
+        default=0.001)
+    allowable_center_deviation = FloatVectorProperty(
+        name="Allowable Center Deviation",
+        description="Allowable center deviation to judge same UV island",
+        min=0.000001,
+        max=0.1,
+        default=(0.001, 0.001),
+        size=2
+    )
+    allowable_size_deviation = FloatVectorProperty(
+        name="Allowable Size Deviation",
+        description="Allowable sizse deviation to judge same UV island",
+        min=0.000001,
+        max=0.1,
+        default=(0.001, 0.001),
+        size=2
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+        if not bm.loops.layers.uv:
+            self.report({'WARNING'},
+                        "Object must have more than one UV map")
+            return {'CANCELLED'}
+        uv_layer = bm.loops.layers.uv.verify()
+
+        selected_faces = [f for f in bm.faces if f.select]
+        island_info = common.get_island_info(obj)
+        num_group = _group_island(island_info,
+                                  self.allowable_center_deviation,
+                                  self.allowable_size_deviation)
+
+        loop_lists = [l for f in bm.faces for l in f.loops]
+        bpy.ops.mesh.select_all(action='DESELECT')
+
+        # pack UV
+        for gidx in range(num_group):
+            group = list(filter(
+                lambda i, idx=gidx: i['group'] == idx, island_info))
+            for f in group[0]['faces']:
+                f['face'].select = True
+        bmesh.update_edit_mesh(obj.data)
+        bpy.ops.uv.select_all(action='SELECT')
+        bpy.ops.uv.pack_islands(rotate=self.rotate, margin=self.margin)
+
+        # copy/paste UV among same islands
+        for gidx in range(num_group):
+            group = list(filter(
+                lambda i, idx=gidx: i['group'] == idx, island_info))
+            if len(group) <= 1:
+                continue
+            for g in group[1:]:
+                for (src_face, dest_face) in zip(
+                        group[0]['sorted'], g['sorted']):
+                    for (src_loop, dest_loop) in zip(
+                            src_face['face'].loops, dest_face['face'].loops):
+                        loop_lists[dest_loop.index][uv_layer].uv = loop_lists[
+                            src_loop.index][uv_layer].uv
+
+        # restore face/UV selection
+        bpy.ops.uv.select_all(action='DESELECT')
+        bpy.ops.mesh.select_all(action='DESELECT')
+        for f in selected_faces:
+            f.select = True
+        bpy.ops.uv.select_all(action='SELECT')
+
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/preserve_uv_aspect.py b/magic_uv/op/preserve_uv_aspect.py
new file mode 100644
index 00000000..116fe898
--- /dev/null
+++ b/magic_uv/op/preserve_uv_aspect.py
@@ -0,0 +1,297 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+from bpy.props import StringProperty, EnumProperty, BoolProperty
+import bmesh
+from mathutils import Vector
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # only 'VIEW_3D' space is allowed to execute
+    for space in context.area.spaces:
+        if space.type == 'VIEW_3D':
+            break
+    else:
+        return False
+
+    return True
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "preserve_uv_aspect"
+
+    @classmethod
+    def init_props(cls, scene):
+        def get_loaded_texture_name(_, __):
+            items = [(key, key, "") for key in bpy.data.images.keys()]
+            items.append(("None", "None", ""))
+            return items
+
+        scene.muv_preserve_uv_aspect_enabled = BoolProperty(
+            name="Preserve UV Aspect Enabled",
+            description="Preserve UV Aspect is enabled",
+            default=False
+        )
+        scene.muv_preserve_uv_aspect_tex_image = EnumProperty(
+            name="Image",
+            description="Texture Image",
+            items=get_loaded_texture_name
+        )
+        scene.muv_preserve_uv_aspect_origin = EnumProperty(
+            name="Origin",
+            description="Aspect Origin",
+            items=[
+                ('CENTER', 'Center', 'Center'),
+                ('LEFT_TOP', 'Left Top', 'Left Bottom'),
+                ('LEFT_CENTER', 'Left Center', 'Left Center'),
+                ('LEFT_BOTTOM', 'Left Bottom', 'Left Bottom'),
+                ('CENTER_TOP', 'Center Top', 'Center Top'),
+                ('CENTER_BOTTOM', 'Center Bottom', 'Center Bottom'),
+                ('RIGHT_TOP', 'Right Top', 'Right Top'),
+                ('RIGHT_CENTER', 'Right Center', 'Right Center'),
+                ('RIGHT_BOTTOM', 'Right Bottom', 'Right Bottom')
+
+            ],
+            default="CENTER"
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_preserve_uv_aspect_enabled
+        del scene.muv_preserve_uv_aspect_tex_image
+        del scene.muv_preserve_uv_aspect_origin
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_PreserveUVAspect(bpy.types.Operator):
+    """
+    Operation class: Preserve UV Aspect
+    """
+
+    bl_idname = "uv.muv_ot_preserve_uv_aspect"
+    bl_label = "Preserve UV Aspect"
+    bl_description = "Choose Image"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    dest_img_name = StringProperty(options={'HIDDEN'})
+    origin = EnumProperty(
+        name="Origin",
+        description="Aspect Origin",
+        items=[
+            ('CENTER', 'Center', 'Center'),
+            ('LEFT_TOP', 'Left Top', 'Left Bottom'),
+            ('LEFT_CENTER', 'Left Center', 'Left Center'),
+            ('LEFT_BOTTOM', 'Left Bottom', 'Left Bottom'),
+            ('CENTER_TOP', 'Center Top', 'Center Top'),
+            ('CENTER_BOTTOM', 'Center Bottom', 'Center Bottom'),
+            ('RIGHT_TOP', 'Right Top', 'Right Top'),
+            ('RIGHT_CENTER', 'Right Center', 'Right Center'),
+            ('RIGHT_BOTTOM', 'Right Bottom', 'Right Bottom')
+
+        ],
+        default="CENTER"
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        # Note: the current system only works if the
+        # f[tex_layer].image doesn't return None
+        # which will happen in certain cases
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+
+        if not bm.loops.layers.uv:
+            self.report({'WARNING'},
+                        "Object must have more than one UV map")
+            return {'CANCELLED'}
+
+        uv_layer = bm.loops.layers.uv.verify()
+
+        sel_faces = [f for f in bm.faces if f.select]
+        dest_img = bpy.data.images[self.dest_img_name]
+
+        info = {}
+
+        if compat.check_version(2, 80, 0) >= 0:
+            tex_image = common.find_image(obj)
+            for f in sel_faces:
+                if tex_image not in info.keys():
+                    info[tex_image] = {}
+                    info[tex_image]['faces'] = []
+                info[tex_image]['faces'].append(f)
+        else:
+            tex_layer = bm.faces.layers.tex.verify()
+            for f in sel_faces:
+                if not f[tex_layer].image in info.keys():
+                    info[f[tex_layer].image] = {}
+                    info[f[tex_layer].image]['faces'] = []
+                info[f[tex_layer].image]['faces'].append(f)
+
+        for img in info:
+            if img is None:
+                continue
+
+            src_img = img
+            ratio = Vector((
+                dest_img.size[0] / src_img.size[0],
+                dest_img.size[1] / src_img.size[1]))
+
+            if self.origin == 'CENTER':
+                origin = Vector((0.0, 0.0))
+                num = 0
+                for f in info[img]['faces']:
+                    for l in f.loops:
+                        uv = l[uv_layer].uv
+                        origin = origin + uv
+                        num = num + 1
+                origin = origin / num
+            elif self.origin == 'LEFT_TOP':
+                origin = Vector((100000.0, -100000.0))
+                for f in info[img]['faces']:
+                    for l in f.loops:
+                        uv = l[uv_layer].uv
+                        origin.x = min(origin.x, uv.x)
+                        origin.y = max(origin.y, uv.y)
+            elif self.origin == 'LEFT_CENTER':
+                origin = Vector((100000.0, 0.0))
+                num = 0
+                for f in info[img]['faces']:
+                    for l in f.loops:
+                        uv = l[uv_layer].uv
+                        origin.x = min(origin.x, uv.x)
+                        origin.y = origin.y + uv.y
+                        num = num + 1
+                origin.y = origin.y / num
+            elif self.origin == 'LEFT_BOTTOM':
+                origin = Vector((100000.0, 100000.0))
+                for f in info[img]['faces']:
+                    for l in f.loops:
+                        uv = l[uv_layer].uv
+                        origin.x = min(origin.x, uv.x)
+                        origin.y = min(origin.y, uv.y)
+            elif self.origin == 'CENTER_TOP':
+                origin = Vector((0.0, -100000.0))
+                num = 0
+                for f in info[img]['faces']:
+                    for l in f.loops:
+                        uv = l[uv_layer].uv
+                        origin.x = origin.x + uv.x
+                        origin.y = max(origin.y, uv.y)
+                        num = num + 1
+                origin.x = origin.x / num
+            elif self.origin == 'CENTER_BOTTOM':
+                origin = Vector((0.0, 100000.0))
+                num = 0
+                for f in info[img]['faces']:
+                    for l in f.loops:
+                        uv = l[uv_layer].uv
+                        origin.x = origin.x + uv.x
+                        origin.y = min(origin.y, uv.y)
+                        num = num + 1
+                origin.x = origin.x / num
+            elif self.origin == 'RIGHT_TOP':
+                origin = Vector((-100000.0, -100000.0))
+                for f in info[img]['faces']:
+                    for l in f.loops:
+                        uv = l[uv_layer].uv
+                        origin.x = max(origin.x, uv.x)
+                        origin.y = max(origin.y, uv.y)
+            elif self.origin == 'RIGHT_CENTER':
+                origin = Vector((-100000.0, 0.0))
+                num = 0
+                for f in info[img]['faces']:
+                    for l in f.loops:
+                        uv = l[uv_layer].uv
+                        origin.x = max(origin.x, uv.x)
+                        origin.y = origin.y + uv.y
+                        num = num + 1
+                origin.y = origin.y / num
+            elif self.origin == 'RIGHT_BOTTOM':
+                origin = Vector((-100000.0, 100000.0))
+                for f in info[img]['faces']:
+                    for l in f.loops:
+                        uv = l[uv_layer].uv
+                        origin.x = max(origin.x, uv.x)
+                        origin.y = min(origin.y, uv.y)
+            else:
+                self.report({'ERROR'}, "Unknown Operation")
+                return {'CANCELLED'}
+
+            info[img]['ratio'] = ratio
+            info[img]['origin'] = origin
+
+        for img in info:
+            if img is None:
+                continue
+
+            if compat.check_version(2, 80, 0) >= 0:
+                nodes = common.find_texture_nodes(obj)
+                nodes[0].image = dest_img
+
+            for f in info[img]['faces']:
+                if compat.check_version(2, 80, 0) < 0:
+                    tex_layer = bm.faces.layers.tex.verify()
+                    f[tex_layer].image = dest_img
+                for l in f.loops:
+                    uv = l[uv_layer].uv
+                    origin = info[img]['origin']
+                    ratio = info[img]['ratio']
+                    diff = uv - origin
+                    diff.x = diff.x / ratio.x
+                    diff.y = diff.y / ratio.y
+                    uv.x = origin.x + diff.x
+                    uv.y = origin.y + diff.y
+                    l[uv_layer].uv = uv
+
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/select_uv.py b/magic_uv/op/select_uv.py
new file mode 100644
index 00000000..72757e29
--- /dev/null
+++ b/magic_uv/op/select_uv.py
@@ -0,0 +1,161 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+from bpy.props import BoolProperty
+import bmesh
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # 'IMAGE_EDITOR' and 'VIEW_3D' space is allowed to execute.
+    # If 'View_3D' space is not allowed, you can't find option in Tool-Shelf
+    # after the execution
+    for space in context.area.spaces:
+        if (space.type == 'IMAGE_EDITOR') or (space.type == 'VIEW_3D'):
+            break
+    else:
+        return False
+
+    return True
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "select_uv"
+
+    @classmethod
+    def init_props(cls, scene):
+        scene.muv_select_uv_enabled = BoolProperty(
+            name="Select UV Enabled",
+            description="Select UV is enabled",
+            default=False
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_select_uv_enabled
+
+
+@BlClassRegistry()
+class MUV_OT_SelectUV_SelectOverlapped(bpy.types.Operator):
+    """
+    Operation class: Select faces which have overlapped UVs
+    """
+
+    bl_idname = "uv.muv_ot_select_uv_select_overlapped"
+    bl_label = "Overlapped"
+    bl_description = "Select faces which have overlapped UVs"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+        uv_layer = bm.loops.layers.uv.verify()
+
+        if context.tool_settings.use_uv_select_sync:
+            sel_faces = [f for f in bm.faces]
+        else:
+            sel_faces = [f for f in bm.faces if f.select]
+
+        overlapped_info = common.get_overlapped_uv_info(bm, sel_faces,
+                                                        uv_layer, 'FACE')
+
+        for info in overlapped_info:
+            if context.tool_settings.use_uv_select_sync:
+                info["subject_face"].select = True
+            else:
+                for l in info["subject_face"].loops:
+                    l[uv_layer].select = True
+
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+class MUV_OT_SelectUV_SelectFlipped(bpy.types.Operator):
+    """
+    Operation class: Select faces which have flipped UVs
+    """
+
+    bl_idname = "uv.muv_ot_select_uv_select_flipped"
+    bl_label = "Flipped"
+    bl_description = "Select faces which have flipped UVs"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+        uv_layer = bm.loops.layers.uv.verify()
+
+        if context.tool_settings.use_uv_select_sync:
+            sel_faces = [f for f in bm.faces]
+        else:
+            sel_faces = [f for f in bm.faces if f.select]
+
+        flipped_info = common.get_flipped_uv_info(sel_faces, uv_layer)
+
+        for info in flipped_info:
+            if context.tool_settings.use_uv_select_sync:
+                info["face"].select = True
+            else:
+                for l in info["face"].loops:
+                    l[uv_layer].select = True
+
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/smooth_uv.py b/magic_uv/op/smooth_uv.py
new file mode 100644
index 00000000..0cb4df51
--- /dev/null
+++ b/magic_uv/op/smooth_uv.py
@@ -0,0 +1,283 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "imdjs, Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+from bpy.props import BoolProperty, FloatProperty
+import bmesh
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # 'IMAGE_EDITOR' and 'VIEW_3D' space is allowed to execute.
+    # If 'View_3D' space is not allowed, you can't find option in Tool-Shelf
+    # after the execution
+    for space in context.area.spaces:
+        if (space.type == 'IMAGE_EDITOR') or (space.type == 'VIEW_3D'):
+            break
+    else:
+        return False
+
+    return True
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "smooth_uv"
+
+    @classmethod
+    def init_props(cls, scene):
+        scene.muv_smooth_uv_enabled = BoolProperty(
+            name="Smooth UV Enabled",
+            description="Smooth UV is enabled",
+            default=False
+        )
+        scene.muv_smooth_uv_transmission = BoolProperty(
+            name="Transmission",
+            description="Smooth linked UVs",
+            default=False
+        )
+        scene.muv_smooth_uv_mesh_infl = FloatProperty(
+            name="Mesh Influence",
+            description="Influence rate of mesh vertex",
+            min=0.0,
+            max=1.0,
+            default=0.0
+        )
+        scene.muv_smooth_uv_select = BoolProperty(
+            name="Select",
+            description="Select UVs which are smoothed",
+            default=False
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_smooth_uv_enabled
+        del scene.muv_smooth_uv_transmission
+        del scene.muv_smooth_uv_mesh_infl
+        del scene.muv_smooth_uv_select
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_SmoothUV(bpy.types.Operator):
+
+    bl_idname = "uv.muv_ot_smooth_uv"
+    bl_label = "Smooth"
+    bl_description = "Smooth UV coordinates"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    transmission = BoolProperty(
+        name="Transmission",
+        description="Smooth linked UVs",
+        default=False
+    )
+    mesh_infl = FloatProperty(
+        name="Mesh Influence",
+        description="Influence rate of mesh vertex",
+        min=0.0,
+        max=1.0,
+        default=0.0
+    )
+    select = BoolProperty(
+        name="Select",
+        description="Select UVs which are smoothed",
+        default=False
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def __smooth_wo_transmission(self, loop_seqs, uv_layer):
+        # calculate path length
+        loops = []
+        for hseq in loop_seqs:
+            loops.extend([hseq[0][0], hseq[0][1]])
+        full_vlen = 0
+        accm_vlens = [0.0]
+        full_uvlen = 0
+        accm_uvlens = [0.0]
+        orig_uvs = [loop_seqs[0][0][0][uv_layer].uv.copy()]
+        for l1, l2 in zip(loops[:-1], loops[1:]):
+            diff_v = l2.vert.co - l1.vert.co
+            full_vlen = full_vlen + diff_v.length
+            accm_vlens.append(full_vlen)
+            diff_uv = l2[uv_layer].uv - l1[uv_layer].uv
+            full_uvlen = full_uvlen + diff_uv.length
+            accm_uvlens.append(full_uvlen)
+            orig_uvs.append(l2[uv_layer].uv.copy())
+
+        for hidx, hseq in enumerate(loop_seqs):
+            pair = hseq[0]
+            for pidx, l in enumerate(pair):
+                if self.select:
+                    l[uv_layer].select = True
+
+                # ignore start/end loop
+                if (hidx == 0 and pidx == 0) or\
+                   ((hidx == len(loop_seqs) - 1) and (pidx == len(pair) - 1)):
+                    continue
+
+                # calculate target path length
+                # target = no influenced * (1 - infl) + influenced * infl
+                tgt_noinfl = full_uvlen * (hidx + pidx) / (len(loop_seqs))
+                tgt_infl = full_uvlen * accm_vlens[hidx * 2 + pidx] / full_vlen
+                target_length = tgt_noinfl * (1 - self.mesh_infl) + \
+                    tgt_infl * self.mesh_infl
+
+                # get target UV
+                for i in range(len(accm_uvlens[:-1])):
+                    # get line segment which UV will be placed
+                    if ((accm_uvlens[i] <= target_length) and
+                            (accm_uvlens[i + 1] > target_length)):
+                        tgt_seg_len = target_length - accm_uvlens[i]
+                        seg_len = accm_uvlens[i + 1] - accm_uvlens[i]
+                        uv1 = orig_uvs[i]
+                        uv2 = orig_uvs[i + 1]
+                        target_uv = uv1 + (uv2 - uv1) * tgt_seg_len / seg_len
+                        break
+                else:
+                    self.report({'ERROR'}, "Failed to get target UV")
+                    return {'CANCELLED'}
+
+                # update UV
+                l[uv_layer].uv = target_uv
+
+    def __smooth_w_transmission(self, loop_seqs, uv_layer):
+        # calculate path length
+        loops = []
+        for vidx in range(len(loop_seqs[0])):
+            ls = []
+            for hseq in loop_seqs:
+                ls.extend(hseq[vidx])
+            loops.append(ls)
+
+        orig_uvs = []
+        accm_vlens = []
+        full_vlens = []
+        accm_uvlens = []
+        full_uvlens = []
+        for ls in loops:
+            full_v = 0.0
+            accm_v = [0.0]
+            full_uv = 0.0
+            accm_uv = [0.0]
+            uvs = [ls[0][uv_layer].uv.copy()]
+            for l1, l2 in zip(ls[:-1], ls[1:]):
+                diff_v = l2.vert.co - l1.vert.co
+                full_v = full_v + diff_v.length
+                accm_v.append(full_v)
+                diff_uv = l2[uv_layer].uv - l1[uv_layer].uv
+                full_uv = full_uv + diff_uv.length
+                accm_uv.append(full_uv)
+                uvs.append(l2[uv_layer].uv.copy())
+            accm_vlens.append(accm_v)
+            full_vlens.append(full_v)
+            accm_uvlens.append(accm_uv)
+            full_uvlens.append(full_uv)
+            orig_uvs.append(uvs)
+
+        for hidx, hseq in enumerate(loop_seqs):
+            for vidx, (pair, uvs, accm_v, full_v, accm_uv, full_uv)\
+                    in enumerate(zip(hseq, orig_uvs, accm_vlens, full_vlens,
+                                     accm_uvlens, full_uvlens)):
+                for pidx, l in enumerate(pair):
+                    if self.select:
+                        l[uv_layer].select = True
+
+                    # ignore start/end loop
+                    if hidx == 0 and pidx == 0:
+                        continue
+                    if hidx == len(loop_seqs) - 1 and pidx == len(pair) - 1:
+                        continue
+
+                    # calculate target path length
+                    # target = no influenced * (1 - infl) + influenced * infl
+                    tgt_noinfl = full_uv * (hidx + pidx) / (len(loop_seqs))
+                    tgt_infl = full_uv * accm_v[hidx * 2 + pidx] / full_v
+                    target_length = tgt_noinfl * (1 - self.mesh_infl) + \
+                        tgt_infl * self.mesh_infl
+
+                    # get target UV
+                    for i in range(len(accm_uv[:-1])):
+                        # get line segment to be placed
+                        if ((accm_uv[i] <= target_length) and
+                                (accm_uv[i + 1] > target_length)):
+                            tgt_seg_len = target_length - accm_uv[i]
+                            seg_len = accm_uv[i + 1] - accm_uv[i]
+                            uv1 = uvs[i]
+                            uv2 = uvs[i + 1]
+                            target_uv = uv1 +\
+                                (uv2 - uv1) * tgt_seg_len / seg_len
+                            break
+                    else:
+                        self.report({'ERROR'}, "Failed to get target UV")
+                        return {'CANCELLED'}
+
+                    # update UV
+                    l[uv_layer].uv = target_uv
+
+    def __smooth(self, loop_seqs, uv_layer):
+        if self.transmission:
+            self.__smooth_w_transmission(loop_seqs, uv_layer)
+        else:
+            self.__smooth_wo_transmission(loop_seqs, uv_layer)
+
+    def execute(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+        uv_layer = bm.loops.layers.uv.verify()
+
+        # loop_seqs[horizontal][vertical][loop]
+        loop_seqs, error = common.get_loop_sequences(bm, uv_layer)
+        if not loop_seqs:
+            self.report({'WARNING'}, error)
+            return {'CANCELLED'}
+
+        # smooth
+        self.__smooth(loop_seqs, uv_layer)
+
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/texture_lock.py b/magic_uv/op/texture_lock.py
new file mode 100644
index 00000000..791a7ae6
--- /dev/null
+++ b/magic_uv/op/texture_lock.py
@@ -0,0 +1,537 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import math
+from math import atan2, cos, sqrt, sin, fabs
+
+import bpy
+from bpy.props import BoolProperty
+import bmesh
+from mathutils import Vector
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+
+def _get_vco(verts_orig, loop):
+    """
+    Get vertex original coordinate from loop
+    """
+    for vo in verts_orig:
+        if vo["vidx"] == loop.vert.index and vo["moved"] is False:
+            return vo["vco"]
+    return loop.vert.co
+
+
+def _get_link_loops(vert):
+    """
+    Get loop linked to vertex
+    """
+    link_loops = []
+    for f in vert.link_faces:
+        adj_loops = []
+        for loop in f.loops:
+            # self loop
+            if loop.vert == vert:
+                l = loop
+            # linked loop
+            else:
+                for e in loop.vert.link_edges:
+                    if e.other_vert(loop.vert) == vert:
+                        adj_loops.append(loop)
+        if len(adj_loops) < 2:
+            return None
+
+        link_loops.append({"l": l, "l0": adj_loops[0], "l1": adj_loops[1]})
+    return link_loops
+
+
+def _get_ini_geom(link_loop, uv_layer, verts_orig, v_orig):
+    """
+    Get initial geometory
+    (Get interior angle of face in vertex/UV space)
+    """
+    u = link_loop["l"][uv_layer].uv
+    v0 = _get_vco(verts_orig, link_loop["l0"])
+    u0 = link_loop["l0"][uv_layer].uv
+    v1 = _get_vco(verts_orig, link_loop["l1"])
+    u1 = link_loop["l1"][uv_layer].uv
+
+    # get interior angle of face in vertex space
+    v0v1 = v1 - v0
+    v0v = v_orig["vco"] - v0
+    v1v = v_orig["vco"] - v1
+    theta0 = v0v1.angle(v0v)
+    theta1 = v0v1.angle(-v1v)
+    if (theta0 + theta1) > math.pi:
+        theta0 = v0v1.angle(-v0v)
+        theta1 = v0v1.angle(v1v)
+
+    # get interior angle of face in UV space
+    u0u1 = u1 - u0
+    u0u = u - u0
+    u1u = u - u1
+    phi0 = u0u1.angle(u0u)
+    phi1 = u0u1.angle(-u1u)
+    if (phi0 + phi1) > math.pi:
+        phi0 = u0u1.angle(-u0u)
+        phi1 = u0u1.angle(u1u)
+
+    # get direction of linked UV coordinate
+    # this will be used to judge whether angle is more or less than 180 degree
+    dir0 = u0u1.cross(u0u) > 0
+    dir1 = u0u1.cross(u1u) > 0
+
+    return {
+        "theta0": theta0,
+        "theta1": theta1,
+        "phi0": phi0,
+        "phi1": phi1,
+        "dir0": dir0,
+        "dir1": dir1}
+
+
+def _get_target_uv(link_loop, uv_layer, verts_orig, v, ini_geom):
+    """
+    Get target UV coordinate
+    """
+    v0 = _get_vco(verts_orig, link_loop["l0"])
+    lo0 = link_loop["l0"]
+    v1 = _get_vco(verts_orig, link_loop["l1"])
+    lo1 = link_loop["l1"]
+
+    # get interior angle of face in vertex space
+    v0v1 = v1 - v0
+    v0v = v.co - v0
+    v1v = v.co - v1
+    theta0 = v0v1.angle(v0v)
+    theta1 = v0v1.angle(-v1v)
+    if (theta0 + theta1) > math.pi:
+        theta0 = v0v1.angle(-v0v)
+        theta1 = v0v1.angle(v1v)
+
+    # calculate target interior angle in UV space
+    phi0 = theta0 * ini_geom["phi0"] / ini_geom["theta0"]
+    phi1 = theta1 * ini_geom["phi1"] / ini_geom["theta1"]
+
+    uv0 = lo0[uv_layer].uv
+    uv1 = lo1[uv_layer].uv
+
+    # calculate target vertex coordinate from target interior angle
+    tuv0, tuv1 = _calc_tri_vert(uv0, uv1, phi0, phi1)
+
+    # target UV coordinate depends on direction, so judge using direction of
+    # linked UV coordinate
+    u0u1 = uv1 - uv0
+    u0u = tuv0 - uv0
+    u1u = tuv0 - uv1
+    dir0 = u0u1.cross(u0u) > 0
+    dir1 = u0u1.cross(u1u) > 0
+    if (ini_geom["dir0"] != dir0) or (ini_geom["dir1"] != dir1):
+        return tuv1
+
+    return tuv0
+
+
+def _calc_tri_vert(v0, v1, angle0, angle1):
+    """
+    Calculate rest coordinate from other coordinates and angle of end
+    """
+    angle = math.pi - angle0 - angle1
+
+    alpha = atan2(v1.y - v0.y, v1.x - v0.x)
+    d = (v1.x - v0.x) / cos(alpha)
+    a = d * sin(angle0) / sin(angle)
+    b = d * sin(angle1) / sin(angle)
+    s = (a + b + d) / 2.0
+    if fabs(d) < 0.0000001:
+        xd = 0
+        yd = 0
+    else:
+        r = s * (s - a) * (s - b) * (s - d)
+        if r < 0:
+            xd = 0
+            yd = 0
+        else:
+            xd = (b * b - a * a + d * d) / (2 * d)
+            yd = 2 * sqrt(r) / d
+    x1 = xd * cos(alpha) - yd * sin(alpha) + v0.x
+    y1 = xd * sin(alpha) + yd * cos(alpha) + v0.y
+    x2 = xd * cos(alpha) + yd * sin(alpha) + v0.x
+    y2 = xd * sin(alpha) - yd * cos(alpha) + v0.y
+
+    return Vector((x1, y1)), Vector((x2, y2))
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # only 'VIEW_3D' space is allowed to execute
+    for space in context.area.spaces:
+        if space.type == 'VIEW_3D':
+            break
+    else:
+        return False
+
+    return True
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "texture_lock"
+
+    @classmethod
+    def init_props(cls, scene):
+        class Props():
+            verts_orig = None
+
+        scene.muv_props.texture_lock = Props()
+
+        def get_func(_):
+            return MUV_OT_TextureLock_Intr.is_running(bpy.context)
+
+        def set_func(_, __):
+            pass
+
+        def update_func(_, __):
+            bpy.ops.uv.muv_ot_texture_lock_intr('INVOKE_REGION_WIN')
+
+        scene.muv_texture_lock_enabled = BoolProperty(
+            name="Texture Lock Enabled",
+            description="Texture Lock is enabled",
+            default=False
+        )
+        scene.muv_texture_lock_lock = BoolProperty(
+            name="Texture Lock Locked",
+            description="Texture Lock is locked",
+            default=False,
+            get=get_func,
+            set=set_func,
+            update=update_func
+        )
+        scene.muv_texture_lock_connect = BoolProperty(
+            name="Connect UV",
+            default=True
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_props.texture_lock
+        del scene.muv_texture_lock_enabled
+        del scene.muv_texture_lock_lock
+        del scene.muv_texture_lock_connect
+
+
+@BlClassRegistry()
+class MUV_OT_TextureLock_Lock(bpy.types.Operator):
+    """
+    Operation class: Lock Texture
+    """
+
+    bl_idname = "uv.muv_ot_texture_lock_lock"
+    bl_label = "Lock Texture"
+    bl_description = "Lock Texture"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    @classmethod
+    def is_ready(cls, context):
+        sc = context.scene
+        props = sc.muv_props.texture_lock
+        if props.verts_orig:
+            return True
+        return False
+
+    def execute(self, context):
+        props = context.scene.muv_props.texture_lock
+        obj = bpy.context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.verts.ensure_lookup_table()
+            bm.edges.ensure_lookup_table()
+            bm.faces.ensure_lookup_table()
+
+        if not bm.loops.layers.uv:
+            self.report({'WARNING'}, "Object must have more than one UV map")
+            return {'CANCELLED'}
+
+        props.verts_orig = [
+            {"vidx": v.index, "vco": v.co.copy(), "moved": False}
+            for v in bm.verts if v.select]
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_TextureLock_Unlock(bpy.types.Operator):
+    """
+    Operation class: Unlock Texture
+    """
+
+    bl_idname = "uv.muv_ot_texture_lock_unlock"
+    bl_label = "Unlock Texture"
+    bl_description = "Unlock Texture"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    connect = BoolProperty(
+        name="Connect UV",
+        default=True
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        sc = context.scene
+        props = sc.muv_props.texture_lock
+        if not props.verts_orig:
+            return False
+        if not MUV_OT_TextureLock_Lock.is_ready(context):
+            return False
+        if not _is_valid_context(context):
+            return False
+        return True
+
+    def execute(self, context):
+        sc = context.scene
+        props = sc.muv_props.texture_lock
+        obj = bpy.context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.verts.ensure_lookup_table()
+            bm.edges.ensure_lookup_table()
+            bm.faces.ensure_lookup_table()
+
+        if not bm.loops.layers.uv:
+            self.report({'WARNING'}, "Object must have more than one UV map")
+            return {'CANCELLED'}
+        uv_layer = bm.loops.layers.uv.verify()
+
+        verts = [v.index for v in bm.verts if v.select]
+        verts_orig = props.verts_orig
+
+        # move UV followed by vertex coordinate
+        for vidx, v_orig in zip(verts, verts_orig):
+            if vidx != v_orig["vidx"]:
+                self.report({'ERROR'}, "Internal Error")
+                return {"CANCELLED"}
+
+            v = bm.verts[vidx]
+            link_loops = _get_link_loops(v)
+
+            result = []
+
+            for ll in link_loops:
+                ini_geom = _get_ini_geom(ll, uv_layer, verts_orig, v_orig)
+                target_uv = _get_target_uv(
+                    ll, uv_layer, verts_orig, v, ini_geom)
+                result.append({"l": ll["l"], "uv": target_uv})
+
+            # connect other face's UV
+            if self.connect:
+                ave = Vector((0.0, 0.0))
+                for r in result:
+                    ave = ave + r["uv"]
+                ave = ave / len(result)
+                for r in result:
+                    r["l"][uv_layer].uv = ave
+            else:
+                for r in result:
+                    r["l"][uv_layer].uv = r["uv"]
+            v_orig["moved"] = True
+            bmesh.update_edit_mesh(obj.data)
+
+        props.verts_orig = None
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+class MUV_OT_TextureLock_Intr(bpy.types.Operator):
+    """
+    Operation class: Texture Lock (Interactive mode)
+    """
+
+    bl_idname = "uv.muv_ot_texture_lock_intr"
+    bl_label = "Texture Lock (Interactive mode)"
+    bl_description = "Internal operation for Texture Lock (Interactive mode)"
+
+    __timer = None
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return False
+        return _is_valid_context(context)
+
+    @classmethod
+    def is_running(cls, _):
+        return 1 if cls.__timer else 0
+
+    @classmethod
+    def handle_add(cls, ops_obj, context):
+        if cls.__timer is None:
+            cls.__timer = context.window_manager.event_timer_add(
+                0.10, window=context.window)
+            context.window_manager.modal_handler_add(ops_obj)
+
+    @classmethod
+    def handle_remove(cls, context):
+        if cls.__timer is not None:
+            context.window_manager.event_timer_remove(cls.__timer)
+            cls.__timer = None
+
+    def __init__(self):
+        self.__intr_verts_orig = []
+        self.__intr_verts = []
+
+    def __sel_verts_changed(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.verts.ensure_lookup_table()
+            bm.edges.ensure_lookup_table()
+            bm.faces.ensure_lookup_table()
+
+        prev = set(self.__intr_verts)
+        now = set([v.index for v in bm.verts if v.select])
+
+        return prev != now
+
+    def __reinit_verts(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.verts.ensure_lookup_table()
+            bm.edges.ensure_lookup_table()
+            bm.faces.ensure_lookup_table()
+
+        self.__intr_verts_orig = [
+            {"vidx": v.index, "vco": v.co.copy(), "moved": False}
+            for v in bm.verts if v.select]
+        self.__intr_verts = [v.index for v in bm.verts if v.select]
+
+    def __update_uv(self, context):
+        """
+        Update UV when vertex coordinates are changed
+        """
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.verts.ensure_lookup_table()
+            bm.edges.ensure_lookup_table()
+            bm.faces.ensure_lookup_table()
+
+        if not bm.loops.layers.uv:
+            self.report({'WARNING'}, "Object must have more than one UV map")
+            return
+        uv_layer = bm.loops.layers.uv.verify()
+
+        verts = [v.index for v in bm.verts if v.select]
+        verts_orig = self.__intr_verts_orig
+
+        for vidx, v_orig in zip(verts, verts_orig):
+            if vidx != v_orig["vidx"]:
+                self.report({'ERROR'}, "Internal Error")
+                return
+
+            v = bm.verts[vidx]
+            link_loops = _get_link_loops(v)
+
+            result = []
+            for ll in link_loops:
+                ini_geom = _get_ini_geom(ll, uv_layer, verts_orig, v_orig)
+                target_uv = _get_target_uv(
+                    ll, uv_layer, verts_orig, v, ini_geom)
+                result.append({"l": ll["l"], "uv": target_uv})
+
+            # UV connect option is always true, because it raises
+            # unexpected behavior
+            ave = Vector((0.0, 0.0))
+            for r in result:
+                ave = ave + r["uv"]
+            ave = ave / len(result)
+            for r in result:
+                r["l"][uv_layer].uv = ave
+            v_orig["moved"] = True
+            bmesh.update_edit_mesh(obj.data)
+
+        common.redraw_all_areas()
+        self.__intr_verts_orig = [
+            {"vidx": v.index, "vco": v.co.copy(), "moved": False}
+            for v in bm.verts if v.select]
+
+    def modal(self, context, event):
+        if not _is_valid_context(context):
+            MUV_OT_TextureLock_Intr.handle_remove(context)
+            return {'FINISHED'}
+
+        if not MUV_OT_TextureLock_Intr.is_running(context):
+            return {'FINISHED'}
+
+        if context.area:
+            context.area.tag_redraw()
+
+        if event.type == 'TIMER':
+            if self.__sel_verts_changed(context):
+                self.__reinit_verts(context)
+            else:
+                self.__update_uv(context)
+
+        return {'PASS_THROUGH'}
+
+    def invoke(self, context, _):
+        if not _is_valid_context(context):
+            return {'CANCELLED'}
+
+        if not MUV_OT_TextureLock_Intr.is_running(context):
+            MUV_OT_TextureLock_Intr.handle_add(self, context)
+            return {'RUNNING_MODAL'}
+        else:
+            MUV_OT_TextureLock_Intr.handle_remove(context)
+
+        if context.area:
+            context.area.tag_redraw()
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/texture_projection.py b/magic_uv/op/texture_projection.py
new file mode 100644
index 00000000..b5360e4d
--- /dev/null
+++ b/magic_uv/op/texture_projection.py
@@ -0,0 +1,417 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+from collections import namedtuple
+
+import bpy
+import bmesh
+from bpy_extras import view3d_utils
+from bpy.props import (
+    BoolProperty,
+    EnumProperty,
+    FloatProperty,
+)
+import mathutils
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+if compat.check_version(2, 80, 0) >= 0:
+    from ..lib import bglx as bgl
+else:
+    import bgl
+
+
+_Rect = namedtuple('Rect', 'x0 y0 x1 y1')
+_Rect2 = namedtuple('Rect2', 'x y width height')
+
+
+def _get_loaded_texture_name(_, __):
+    items = [(key, key, "") for key in bpy.data.images.keys()]
+    items.append(("None", "None", ""))
+    return items
+
+
+def _get_canvas(context, magnitude):
+    """
+    Get canvas to be renderred texture
+    """
+    sc = context.scene
+    user_prefs = compat.get_user_preferences(context)
+    prefs = user_prefs.addons["magic_uv"].preferences
+
+    region_w = context.region.width
+    region_h = context.region.height
+    canvas_w = region_w - prefs.texture_projection_canvas_padding[0] * 2.0
+    canvas_h = region_h - prefs.texture_projection_canvas_padding[1] * 2.0
+
+    img = bpy.data.images[sc.muv_texture_projection_tex_image]
+    tex_w = img.size[0]
+    tex_h = img.size[1]
+
+    center_x = region_w * 0.5
+    center_y = region_h * 0.5
+
+    if sc.muv_texture_projection_adjust_window:
+        ratio_x = canvas_w / tex_w
+        ratio_y = canvas_h / tex_h
+        if sc.muv_texture_projection_apply_tex_aspect:
+            ratio = ratio_y if ratio_x > ratio_y else ratio_x
+            len_x = ratio * tex_w
+            len_y = ratio * tex_h
+        else:
+            len_x = canvas_w
+            len_y = canvas_h
+    else:
+        if sc.muv_texture_projection_apply_tex_aspect:
+            len_x = tex_w * magnitude
+            len_y = tex_h * magnitude
+        else:
+            len_x = region_w * magnitude
+            len_y = region_h * magnitude
+
+    x0 = int(center_x - len_x * 0.5)
+    y0 = int(center_y - len_y * 0.5)
+    x1 = int(center_x + len_x * 0.5)
+    y1 = int(center_y + len_y * 0.5)
+
+    return _Rect(x0, y0, x1, y1)
+
+
+def _rect_to_rect2(rect):
+    """
+    Convert Rect1 to Rect2
+    """
+
+    return _Rect2(rect.x0, rect.y0, rect.x1 - rect.x0, rect.y1 - rect.y0)
+
+
+def _region_to_canvas(rg_vec, canvas):
+    """
+    Convert screen region to canvas
+    """
+
+    cv_rect = _rect_to_rect2(canvas)
+    cv_vec = mathutils.Vector()
+    cv_vec.x = (rg_vec.x - cv_rect.x) / cv_rect.width
+    cv_vec.y = (rg_vec.y - cv_rect.y) / cv_rect.height
+
+    return cv_vec
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # only 'VIEW_3D' space is allowed to execute
+    for space in context.area.spaces:
+        if space.type == 'VIEW_3D':
+            break
+    else:
+        return False
+
+    return True
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "texture_projection"
+
+    @classmethod
+    def init_props(cls, scene):
+        def get_func(_):
+            return MUV_OT_TextureProjection.is_running(bpy.context)
+
+        def set_func(_, __):
+            pass
+
+        def update_func(_, __):
+            bpy.ops.uv.muv_ot_texture_projection('INVOKE_REGION_WIN')
+
+        scene.muv_texture_projection_enabled = BoolProperty(
+            name="Texture Projection Enabled",
+            description="Texture Projection is enabled",
+            default=False
+        )
+        scene.muv_texture_projection_enable = BoolProperty(
+            name="Texture Projection Enabled",
+            description="Texture Projection is enabled",
+            default=False,
+            get=get_func,
+            set=set_func,
+            update=update_func
+        )
+        scene.muv_texture_projection_tex_magnitude = FloatProperty(
+            name="Magnitude",
+            description="Texture Magnitude",
+            default=0.5,
+            min=0.0,
+            max=100.0
+        )
+        scene.muv_texture_projection_tex_image = EnumProperty(
+            name="Image",
+            description="Texture Image",
+            items=_get_loaded_texture_name
+        )
+        scene.muv_texture_projection_tex_transparency = FloatProperty(
+            name="Transparency",
+            description="Texture Transparency",
+            default=0.2,
+            min=0.0,
+            max=1.0
+        )
+        scene.muv_texture_projection_adjust_window = BoolProperty(
+            name="Adjust Window",
+            description="Size of renderered texture is fitted to window",
+            default=True
+        )
+        scene.muv_texture_projection_apply_tex_aspect = BoolProperty(
+            name="Texture Aspect Ratio",
+            description="Apply Texture Aspect ratio to displayed texture",
+            default=True
+        )
+        scene.muv_texture_projection_assign_uvmap = BoolProperty(
+            name="Assign UVMap",
+            description="Assign UVMap when no UVmaps are available",
+            default=True
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_texture_projection_enabled
+        del scene.muv_texture_projection_tex_magnitude
+        del scene.muv_texture_projection_tex_image
+        del scene.muv_texture_projection_tex_transparency
+        del scene.muv_texture_projection_adjust_window
+        del scene.muv_texture_projection_apply_tex_aspect
+        del scene.muv_texture_projection_assign_uvmap
+
+
+@BlClassRegistry()
+class MUV_OT_TextureProjection(bpy.types.Operator):
+    """
+    Operation class: Texture Projection
+    Render texture
+    """
+
+    bl_idname = "uv.muv_ot_texture_projection"
+    bl_description = "Render selected texture"
+    bl_label = "Texture renderer"
+
+    __handle = None
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return False
+        return _is_valid_context(context)
+
+    @classmethod
+    def is_running(cls, _):
+        return 1 if cls.__handle else 0
+
+    @classmethod
+    def handle_add(cls, obj, context):
+        cls.__handle = bpy.types.SpaceView3D.draw_handler_add(
+            MUV_OT_TextureProjection.draw_texture,
+            (obj, context), 'WINDOW', 'POST_PIXEL')
+
+    @classmethod
+    def handle_remove(cls):
+        if cls.__handle is not None:
+            bpy.types.SpaceView3D.draw_handler_remove(cls.__handle, 'WINDOW')
+            cls.__handle = None
+
+    @classmethod
+    def draw_texture(cls, _, context):
+        sc = context.scene
+
+        if not cls.is_running(context):
+            return
+
+        # no textures are selected
+        if sc.muv_texture_projection_tex_image == "None":
+            return
+
+        # get texture to be renderred
+        img = bpy.data.images[sc.muv_texture_projection_tex_image]
+
+        # setup rendering region
+        rect = _get_canvas(context, sc.muv_texture_projection_tex_magnitude)
+        positions = [
+            [rect.x0, rect.y0],
+            [rect.x0, rect.y1],
+            [rect.x1, rect.y1],
+            [rect.x1, rect.y0]
+        ]
+        tex_coords = [
+            [0.0, 0.0],
+            [0.0, 1.0],
+            [1.0, 1.0],
+            [1.0, 0.0]
+        ]
+
+        # OpenGL configuration
+        if compat.check_version(2, 80, 0) >= 0:
+            bgl.glEnable(bgl.GL_BLEND)
+            bgl.glEnable(bgl.GL_TEXTURE_2D)
+            bgl.glActiveTexture(bgl.GL_TEXTURE0)
+            if img.bindcode:
+                bind = img.bindcode
+                bgl.glBindTexture(bgl.GL_TEXTURE_2D, bind)
+        else:
+            bgl.glEnable(bgl.GL_BLEND)
+            bgl.glEnable(bgl.GL_TEXTURE_2D)
+            if img.bindcode:
+                bind = img.bindcode[0]
+                bgl.glBindTexture(bgl.GL_TEXTURE_2D, bind)
+                bgl.glTexParameteri(bgl.GL_TEXTURE_2D,
+                                    bgl.GL_TEXTURE_MIN_FILTER, bgl.GL_LINEAR)
+                bgl.glTexParameteri(bgl.GL_TEXTURE_2D,
+                                    bgl.GL_TEXTURE_MAG_FILTER, bgl.GL_LINEAR)
+                bgl.glTexEnvi(
+                    bgl.GL_TEXTURE_ENV, bgl.GL_TEXTURE_ENV_MODE,
+                    bgl.GL_MODULATE)
+
+        # render texture
+        bgl.glBegin(bgl.GL_QUADS)
+        bgl.glColor4f(1.0, 1.0, 1.0,
+                      sc.muv_texture_projection_tex_transparency)
+        for (v1, v2), (u, v) in zip(positions, tex_coords):
+            bgl.glTexCoord2f(u, v)
+            bgl.glVertex2f(v1, v2)
+        bgl.glEnd()
+
+    def invoke(self, context, _):
+        if not MUV_OT_TextureProjection.is_running(context):
+            MUV_OT_TextureProjection.handle_add(self, context)
+        else:
+            MUV_OT_TextureProjection.handle_remove()
+
+        if context.area:
+            context.area.tag_redraw()
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+class MUV_OT_TextureProjection_Project(bpy.types.Operator):
+    """
+    Operation class: Project texture
+    """
+
+    bl_idname = "uv.muv_ot_texture_projection_project"
+    bl_label = "Project Texture"
+    bl_description = "Project Texture"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        if not MUV_OT_TextureProjection.is_running(context):
+            return False
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        sc = context.scene
+
+        if sc.muv_texture_projection_tex_image == "None":
+            self.report({'WARNING'}, "No textures are selected")
+            return {'CANCELLED'}
+
+        _, region, space = common.get_space('VIEW_3D', 'WINDOW', 'VIEW_3D')
+
+        # get faces to be texture projected
+        obj = context.active_object
+        world_mat = obj.matrix_world
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+
+        # get UV and texture layer
+        if not bm.loops.layers.uv:
+            if sc.muv_texture_projection_assign_uvmap:
+                bm.loops.layers.uv.new()
+            else:
+                self.report({'WARNING'},
+                            "Object must have more than one UV map")
+                return {'CANCELLED'}
+
+        uv_layer = bm.loops.layers.uv.verify()
+        if compat.check_version(2, 80, 0) < 0:
+            tex_layer = bm.faces.layers.tex.verify()
+
+        sel_faces = [f for f in bm.faces if f.select]
+
+        # transform 3d space to screen region
+        v_screen = [
+            view3d_utils.location_3d_to_region_2d(
+                region,
+                space.region_3d,
+                compat.matmul(world_mat, l.vert.co))
+            for f in sel_faces for l in f.loops
+        ]
+
+        # transform screen region to canvas
+        v_canvas = [
+            _region_to_canvas(
+                v,
+                _get_canvas(bpy.context,
+                            sc.muv_texture_projection_tex_magnitude)
+            ) for v in v_screen
+        ]
+
+        if compat.check_version(2, 80, 0) >= 0:
+            # set texture
+            nodes = common.find_texture_nodes(obj)
+            nodes[0].image = \
+                bpy.data.images[sc.muv_texture_projection_tex_image]
+
+        # project texture to object
+        i = 0
+        for f in sel_faces:
+            if compat.check_version(2, 80, 0) < 0:
+                f[tex_layer].image = \
+                    bpy.data.images[sc.muv_texture_projection_tex_image]
+            for l in f.loops:
+                l[uv_layer].uv = v_canvas[i].to_2d()
+                i = i + 1
+
+        common.redraw_all_areas()
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/texture_wrap.py b/magic_uv/op/texture_wrap.py
new file mode 100644
index 00000000..49242b83
--- /dev/null
+++ b/magic_uv/op/texture_wrap.py
@@ -0,0 +1,294 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+from bpy.props import (
+    BoolProperty,
+)
+import bmesh
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # only 'VIEW_3D' space is allowed to execute
+    for space in context.area.spaces:
+        if space.type == 'VIEW_3D':
+            break
+    else:
+        return False
+
+    return True
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "texture_wrap"
+
+    @classmethod
+    def init_props(cls, scene):
+        class Props():
+            ref_face_index = -1
+            ref_obj = None
+
+        scene.muv_props.texture_wrap = Props()
+
+        scene.muv_texture_wrap_enabled = BoolProperty(
+            name="Texture Wrap",
+            description="Texture Wrap is enabled",
+            default=False
+        )
+        scene.muv_texture_wrap_set_and_refer = BoolProperty(
+            name="Set and Refer",
+            description="Refer and set UV",
+            default=True
+        )
+        scene.muv_texture_wrap_selseq = BoolProperty(
+            name="Selection Sequence",
+            description="Set UV sequentially",
+            default=False
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_props.texture_wrap
+        del scene.muv_texture_wrap_enabled
+        del scene.muv_texture_wrap_set_and_refer
+        del scene.muv_texture_wrap_selseq
+
+
+@BlClassRegistry()
+class MUV_OT_TextureWrap_Refer(bpy.types.Operator):
+    """
+    Operation class: Refer UV
+    """
+
+    bl_idname = "uv.muv_ot_texture_wrap_refer"
+    bl_label = "Refer"
+    bl_description = "Refer UV"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        props = context.scene.muv_props.texture_wrap
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+
+        if not bm.loops.layers.uv:
+            self.report({'WARNING'}, "Object must have more than one UV map")
+            return {'CANCELLED'}
+
+        sel_faces = [f for f in bm.faces if f.select]
+        if len(sel_faces) != 1:
+            self.report({'WARNING'}, "Must select only one face")
+            return {'CANCELLED'}
+
+        props.ref_face_index = sel_faces[0].index
+        props.ref_obj = obj
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+class MUV_OT_TextureWrap_Set(bpy.types.Operator):
+    """
+    Operation class: Set UV
+    """
+
+    bl_idname = "uv.muv_ot_texture_wrap_set"
+    bl_label = "Set"
+    bl_description = "Set UV"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        sc = context.scene
+        props = sc.muv_props.texture_wrap
+        if not props.ref_obj:
+            return False
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        sc = context.scene
+        props = sc.muv_props.texture_wrap
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+
+        if not bm.loops.layers.uv:
+            self.report({'WARNING'}, "Object must have more than one UV map")
+            return {'CANCELLED'}
+        uv_layer = bm.loops.layers.uv.verify()
+
+        if sc.muv_texture_wrap_selseq:
+            sel_faces = []
+            for hist in bm.select_history:
+                if isinstance(hist, bmesh.types.BMFace) and hist.select:
+                    sel_faces.append(hist)
+            if not sel_faces:
+                self.report({'WARNING'}, "Must select more than one face")
+                return {'CANCELLED'}
+        else:
+            sel_faces = [f for f in bm.faces if f.select]
+            if len(sel_faces) != 1:
+                self.report({'WARNING'}, "Must select only one face")
+                return {'CANCELLED'}
+
+        ref_face_index = props.ref_face_index
+        for face in sel_faces:
+            tgt_face_index = face.index
+            if ref_face_index == tgt_face_index:
+                self.report({'WARNING'}, "Must select different face")
+                return {'CANCELLED'}
+
+            if props.ref_obj != obj:
+                self.report({'WARNING'}, "Object must be same")
+                return {'CANCELLED'}
+
+            ref_face = bm.faces[ref_face_index]
+            tgt_face = bm.faces[tgt_face_index]
+
+            # get common vertices info
+            common_verts = []
+            for sl in ref_face.loops:
+                for dl in tgt_face.loops:
+                    if sl.vert == dl.vert:
+                        info = {"vert": sl.vert, "ref_loop": sl,
+                                "tgt_loop": dl}
+                        common_verts.append(info)
+                        break
+
+            if len(common_verts) != 2:
+                self.report({'WARNING'},
+                            "2 vertices must be shared among faces")
+                return {'CANCELLED'}
+
+            # get reference other vertices info
+            ref_other_verts = []
+            for sl in ref_face.loops:
+                for ci in common_verts:
+                    if sl.vert == ci["vert"]:
+                        break
+                else:
+                    info = {"vert": sl.vert, "loop": sl}
+                    ref_other_verts.append(info)
+
+            if not ref_other_verts:
+                self.report({'WARNING'}, "More than 1 vertex must be unshared")
+                return {'CANCELLED'}
+
+            # get reference info
+            ref_info = {}
+            cv0 = common_verts[0]["vert"].co
+            cv1 = common_verts[1]["vert"].co
+            cuv0 = common_verts[0]["ref_loop"][uv_layer].uv
+            cuv1 = common_verts[1]["ref_loop"][uv_layer].uv
+            ov0 = ref_other_verts[0]["vert"].co
+            ouv0 = ref_other_verts[0]["loop"][uv_layer].uv
+            ref_info["vert_vdiff"] = cv1 - cv0
+            ref_info["uv_vdiff"] = cuv1 - cuv0
+            ref_info["vert_hdiff"], _ = common.diff_point_to_segment(
+                cv0, cv1, ov0)
+            ref_info["uv_hdiff"], _ = common.diff_point_to_segment(
+                cuv0, cuv1, ouv0)
+
+            # get target other vertices info
+            tgt_other_verts = []
+            for dl in tgt_face.loops:
+                for ci in common_verts:
+                    if dl.vert == ci["vert"]:
+                        break
+                else:
+                    info = {"vert": dl.vert, "loop": dl}
+                    tgt_other_verts.append(info)
+
+            if not tgt_other_verts:
+                self.report({'WARNING'}, "More than 1 vertex must be unshared")
+                return {'CANCELLED'}
+
+            # get target info
+            for info in tgt_other_verts:
+                cv0 = common_verts[0]["vert"].co
+                cv1 = common_verts[1]["vert"].co
+                cuv0 = common_verts[0]["ref_loop"][uv_layer].uv
+                ov = info["vert"].co
+                info["vert_hdiff"], x = common.diff_point_to_segment(
+                    cv0, cv1, ov)
+                info["vert_vdiff"] = x - common_verts[0]["vert"].co
+
+                # calclulate factor
+                fact_h = -info["vert_hdiff"].length / \
+                    ref_info["vert_hdiff"].length
+                fact_v = info["vert_vdiff"].length / \
+                    ref_info["vert_vdiff"].length
+                duv_h = ref_info["uv_hdiff"] * fact_h
+                duv_v = ref_info["uv_vdiff"] * fact_v
+
+                # get target UV
+                info["target_uv"] = cuv0 + duv_h + duv_v
+
+            # apply to common UVs
+            for info in common_verts:
+                info["tgt_loop"][uv_layer].uv = \
+                    info["ref_loop"][uv_layer].uv.copy()
+            # apply to other UVs
+            for info in tgt_other_verts:
+                info["loop"][uv_layer].uv = info["target_uv"]
+
+            common.debug_print("===== Target Other Vertices =====")
+            common.debug_print(tgt_other_verts)
+
+            bmesh.update_edit_mesh(obj.data)
+
+            ref_face_index = tgt_face_index
+
+        if sc.muv_texture_wrap_set_and_refer:
+            props.ref_face_index = tgt_face_index
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/transfer_uv.py b/magic_uv/op/transfer_uv.py
new file mode 100644
index 00000000..e812d295
--- /dev/null
+++ b/magic_uv/op/transfer_uv.py
@@ -0,0 +1,457 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>, Mifth, MaxRobinot"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+from collections import OrderedDict
+
+import bpy
+import bmesh
+from bpy.props import BoolProperty
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # only 'VIEW_3D' space is allowed to execute
+    for space in context.area.spaces:
+        if space.type == 'VIEW_3D':
+            break
+    else:
+        return False
+
+    return True
+
+
+def _get_uv_layer(ops_obj, bm):
+    # get UV layer
+    if not bm.loops.layers.uv:
+        ops_obj.report({'WARNING'}, "Object must have more than one UV map")
+        return None
+    uv_layer = bm.loops.layers.uv.verify()
+
+    return uv_layer
+
+
+def _main_parse(ops_obj, uv_layer, sel_faces, active_face, active_face_nor):
+    all_sorted_faces = OrderedDict()  # This is the main stuff
+
+    used_verts = set()
+    used_edges = set()
+
+    faces_to_parse = []
+
+    # get shared edge of two faces
+    cross_edges = []
+    for edge in active_face.edges:
+        if edge in sel_faces[0].edges and edge in sel_faces[1].edges:
+            cross_edges.append(edge)
+
+    # parse two selected faces
+    if cross_edges and len(cross_edges) == 1:
+        shared_edge = cross_edges[0]
+        vert1 = None
+        vert2 = None
+
+        dot_n = active_face_nor.normalized()
+        edge_vec_1 = (shared_edge.verts[1].co - shared_edge.verts[0].co)
+        edge_vec_len = edge_vec_1.length
+        edge_vec_1 = edge_vec_1.normalized()
+
+        af_center = active_face.calc_center_median()
+        af_vec = shared_edge.verts[0].co + (edge_vec_1 * (edge_vec_len * 0.5))
+        af_vec = (af_vec - af_center).normalized()
+
+        if af_vec.cross(edge_vec_1).dot(dot_n) > 0:
+            vert1 = shared_edge.verts[0]
+            vert2 = shared_edge.verts[1]
+        else:
+            vert1 = shared_edge.verts[1]
+            vert2 = shared_edge.verts[0]
+
+        # get active face stuff and uvs
+        face_stuff = _get_other_verts_edges(
+            active_face, vert1, vert2, shared_edge, uv_layer)
+        all_sorted_faces[active_face] = face_stuff
+        used_verts.update(active_face.verts)
+        used_edges.update(active_face.edges)
+
+        # get first selected face stuff and uvs as they share shared_edge
+        second_face = sel_faces[0]
+        if second_face is active_face:
+            second_face = sel_faces[1]
+        face_stuff = _get_other_verts_edges(
+            second_face, vert1, vert2, shared_edge, uv_layer)
+        all_sorted_faces[second_face] = face_stuff
+        used_verts.update(second_face.verts)
+        used_edges.update(second_face.edges)
+
+        # first Grow
+        faces_to_parse.append(active_face)
+        faces_to_parse.append(second_face)
+
+    else:
+        ops_obj.report({'WARNING'}, "Two faces should share one edge")
+        return None
+
+    # parse all faces
+    while True:
+        new_parsed_faces = []
+        if not faces_to_parse:
+            break
+        for face in faces_to_parse:
+            face_stuff = all_sorted_faces.get(face)
+            new_faces = _parse_faces(face, face_stuff, used_verts, used_edges,
+                                     all_sorted_faces, uv_layer)
+            if new_faces is None:
+                ops_obj.report({'WARNING'}, "More than 2 faces share edge")
+                return None
+
+            new_parsed_faces += new_faces
+        faces_to_parse = new_parsed_faces
+
+    return all_sorted_faces
+
+
+def _parse_faces(check_face, face_stuff, used_verts, used_edges,
+                 all_sorted_faces, uv_layer):
+    """recurse faces around the new_grow only"""
+
+    new_shared_faces = []
+    for sorted_edge in face_stuff[1]:
+        shared_faces = sorted_edge.link_faces
+        if shared_faces:
+            if len(shared_faces) > 2:
+                bpy.ops.mesh.select_all(action='DESELECT')
+                for face_sel in shared_faces:
+                    face_sel.select = True
+                shared_faces = []
+                return None
+
+            clear_shared_faces = _get_new_shared_faces(
+                check_face, sorted_edge, shared_faces, all_sorted_faces.keys())
+            if clear_shared_faces:
+                shared_face = clear_shared_faces[0]
+                # get vertices of the edge
+                vert1 = sorted_edge.verts[0]
+                vert2 = sorted_edge.verts[1]
+
+                common.debug_print(face_stuff[0], vert1, vert2)
+                if face_stuff[0].index(vert1) > face_stuff[0].index(vert2):
+                    vert1 = sorted_edge.verts[1]
+                    vert2 = sorted_edge.verts[0]
+
+                common.debug_print(shared_face.verts, vert1, vert2)
+                new_face_stuff = _get_other_verts_edges(
+                    shared_face, vert1, vert2, sorted_edge, uv_layer)
+                all_sorted_faces[shared_face] = new_face_stuff
+                used_verts.update(shared_face.verts)
+                used_edges.update(shared_face.edges)
+
+                if common.is_debug_mode():
+                    shared_face.select = True  # test which faces are parsed
+
+                new_shared_faces.append(shared_face)
+
+    return new_shared_faces
+
+
+def _get_new_shared_faces(orig_face, shared_edge, check_faces, used_faces):
+    shared_faces = []
+
+    for face in check_faces:
+        is_shared_edge = shared_edge in face.edges
+        not_used = face not in used_faces
+        not_orig = face is not orig_face
+        not_hide = face.hide is False
+        if is_shared_edge and not_used and not_orig and not_hide:
+            shared_faces.append(face)
+
+    return shared_faces
+
+
+def _get_other_verts_edges(face, vert1, vert2, first_edge, uv_layer):
+    face_edges = [first_edge]
+    face_verts = [vert1, vert2]
+    face_loops = []
+
+    other_edges = [edge for edge in face.edges if edge not in face_edges]
+
+    for _ in range(len(other_edges)):
+        found_edge = None
+        # get sorted verts and edges
+        for edge in other_edges:
+            if face_verts[-1] in edge.verts:
+                other_vert = edge.other_vert(face_verts[-1])
+
+                if other_vert not in face_verts:
+                    face_verts.append(other_vert)
+
+                found_edge = edge
+                if found_edge not in face_edges:
+                    face_edges.append(edge)
+                break
+
+        other_edges.remove(found_edge)
+
+    # get sorted uvs
+    for vert in face_verts:
+        for loop in face.loops:
+            if loop.vert is vert:
+                face_loops.append(loop[uv_layer])
+                break
+
+    return [face_verts, face_edges, face_loops]
+
+
+def _get_selected_src_faces(ops_obj, bm, uv_layer):
+    topology_copied = []
+
+    # get selected faces
+    active_face = bm.faces.active
+    sel_faces = [face for face in bm.faces if face.select]
+    if len(sel_faces) != 2:
+        ops_obj.report({'WARNING'}, "Two faces must be selected")
+        return None
+    if not active_face or active_face not in sel_faces:
+        ops_obj.report({'WARNING'}, "Two faces must be active")
+        return None
+
+    # parse all faces according to selection
+    active_face_nor = active_face.normal.copy()
+    all_sorted_faces = _main_parse(ops_obj, uv_layer, sel_faces, active_face,
+                                   active_face_nor)
+
+    if all_sorted_faces:
+        for face_data in all_sorted_faces.values():
+            edges = face_data[1]
+            uv_loops = face_data[2]
+            uvs = [l.uv.copy() for l in uv_loops]
+            pin_uvs = [l.pin_uv for l in uv_loops]
+            seams = [e.seam for e in edges]
+            topology_copied.append([uvs, pin_uvs, seams])
+    else:
+        return None
+
+    return topology_copied
+
+
+def _paste_uv(ops_obj, bm, uv_layer, src_faces, invert_normals, copy_seams):
+    # get selection history
+    all_sel_faces = [e for e in bm.select_history
+                     if isinstance(e, bmesh.types.BMFace) and e.select]
+    if len(all_sel_faces) % 2 != 0:
+        ops_obj.report({'WARNING'}, "Two faces must be selected")
+        return -1
+
+    # parse selection history
+    for i, _ in enumerate(all_sel_faces):
+        if (i == 0) or (i % 2 == 0):
+            continue
+        sel_faces = [all_sel_faces[i - 1], all_sel_faces[i]]
+        active_face = all_sel_faces[i]
+
+        # parse all faces according to selection history
+        active_face_nor = active_face.normal.copy()
+        if invert_normals:
+            active_face_nor.negate()
+        all_sorted_faces = _main_parse(ops_obj, uv_layer, sel_faces,
+                                       active_face, active_face_nor)
+
+        if all_sorted_faces:
+            # check amount of copied/pasted faces
+            if len(all_sorted_faces) != len(src_faces):
+                ops_obj.report({'WARNING'},
+                               "Mesh has different amount of faces")
+                return -1
+
+            for j, face_data in enumerate(all_sorted_faces.values()):
+                copied_data = src_faces[j]
+
+                # check amount of copied/pasted verts
+                if len(copied_data[0]) != len(face_data[2]):
+                    bpy.ops.mesh.select_all(action='DESELECT')
+                    # select problematic face
+                    list(all_sorted_faces.keys())[j].select = True
+                    ops_obj.report({'WARNING'},
+                                   "Face have different amount of vertices")
+                    return 0
+
+                for k, (edge, uvloop) in enumerate(zip(face_data[1],
+                                                       face_data[2])):
+                    uvloop.uv = copied_data[0][k]
+                    uvloop.pin_uv = copied_data[1][k]
+                    if copy_seams:
+                        edge.seam = copied_data[2][k]
+        else:
+            return -1
+
+    return 0
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "transfer_uv"
+
+    @classmethod
+    def init_props(cls, scene):
+        class Props():
+            topology_copied = None
+
+        scene.muv_props.transfer_uv = Props()
+
+        scene.muv_transfer_uv_enabled = BoolProperty(
+            name="Transfer UV Enabled",
+            description="Transfer UV is enabled",
+            default=False
+        )
+        scene.muv_transfer_uv_invert_normals = BoolProperty(
+            name="Invert Normals",
+            description="Invert Normals",
+            default=False
+        )
+        scene.muv_transfer_uv_copy_seams = BoolProperty(
+            name="Copy Seams",
+            description="Copy Seams",
+            default=True
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_transfer_uv_enabled
+        del scene.muv_transfer_uv_invert_normals
+        del scene.muv_transfer_uv_copy_seams
+
+
+@BlClassRegistry()
+class MUV_OT_TransferUV_CopyUV(bpy.types.Operator):
+    """
+        Operation class: Transfer UV copy
+        Topological based copy
+    """
+
+    bl_idname = "uv.muv_ot_transfer_uv_copy_uv"
+    bl_label = "Transfer UV Copy UV"
+    bl_description = "Transfer UV Copy UV (Topological based copy)"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        props = context.scene.muv_props.transfer_uv
+        active_obj = context.active_object
+        bm = bmesh.from_edit_mesh(active_obj.data)
+        if compat.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+
+        uv_layer = _get_uv_layer(self, bm)
+        if uv_layer is None:
+            return {'CANCELLED'}
+
+        faces = _get_selected_src_faces(self, bm, uv_layer)
+        if faces is None:
+            return {'CANCELLED'}
+        props.topology_copied = faces
+
+        bmesh.update_edit_mesh(active_obj.data)
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_TransferUV_PasteUV(bpy.types.Operator):
+    """
+        Operation class: Transfer UV paste
+        Topological based paste
+    """
+
+    bl_idname = "uv.muv_ot_transfer_uv_paste_uv"
+    bl_label = "Transfer UV Paste UV"
+    bl_description = "Transfer UV Paste UV (Topological based paste)"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    invert_normals = BoolProperty(
+        name="Invert Normals",
+        description="Invert Normals",
+        default=False
+    )
+    copy_seams = BoolProperty(
+        name="Copy Seams",
+        description="Copy Seams",
+        default=True
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        sc = context.scene
+        props = sc.muv_props.transfer_uv
+        if not props.topology_copied:
+            return False
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        props = context.scene.muv_props.transfer_uv
+        active_obj = context.active_object
+        bm = bmesh.from_edit_mesh(active_obj.data)
+        if compat.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+
+        # get UV layer
+        uv_layer = _get_uv_layer(self, bm)
+        if uv_layer is None:
+            return {'CANCELLED'}
+
+        ret = _paste_uv(self, bm, uv_layer, props.topology_copied,
+                        self.invert_normals, self.copy_seams)
+        if ret:
+            return {'CANCELLED'}
+
+        bmesh.update_edit_mesh(active_obj.data)
+
+        if compat.check_version(2, 80, 0) < 0:
+            if self.copy_seams:
+                active_obj.data.show_edge_seams = True
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/unwrap_constraint.py b/magic_uv/op/unwrap_constraint.py
new file mode 100644
index 00000000..b622663a
--- /dev/null
+++ b/magic_uv/op/unwrap_constraint.py
@@ -0,0 +1,186 @@
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+from bpy.props import (
+    BoolProperty,
+    EnumProperty,
+    FloatProperty,
+)
+import bmesh
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # only 'VIEW_3D' space is allowed to execute
+    for space in context.area.spaces:
+        if space.type == 'VIEW_3D':
+            break
+    else:
+        return False
+
+    return True
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "unwrap_constraint"
+
+    @classmethod
+    def init_props(cls, scene):
+        scene.muv_unwrap_constraint_enabled = BoolProperty(
+            name="Unwrap Constraint Enabled",
+            description="Unwrap Constraint is enabled",
+            default=False
+        )
+        scene.muv_unwrap_constraint_u_const = BoolProperty(
+            name="U-Constraint",
+            description="Keep UV U-axis coordinate",
+            default=False
+        )
+        scene.muv_unwrap_constraint_v_const = BoolProperty(
+            name="V-Constraint",
+            description="Keep UV V-axis coordinate",
+            default=False
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_unwrap_constraint_enabled
+        del scene.muv_unwrap_constraint_u_const
+        del scene.muv_unwrap_constraint_v_const
+
+
+@BlClassRegistry(legacy=True)
+@compat.make_annotations
+class MUV_OT_UnwrapConstraint(bpy.types.Operator):
+    """
+    Operation class: Unwrap with constrain UV coordinate
+    """
+
+    bl_idname = "uv.muv_ot_unwrap_constraint"
+    bl_label = "Unwrap Constraint"
+    bl_description = "Unwrap while keeping uv coordinate"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    # property for original unwrap
+    method = EnumProperty(
+        name="Method",
+        description="Unwrapping method",
+        items=[
+            ('ANGLE_BASED', 'Angle Based', 'Angle Based'),
+            ('CONFORMAL', 'Conformal', 'Conformal')
+        ],
+        default='ANGLE_BASED')
+    fill_holes = BoolProperty(
+        name="Fill Holes",
+        description="Virtual fill holes in meshes before unwrapping",
+        default=True)
+    correct_aspect = BoolProperty(
+        name="Correct Aspect",
+        description="Map UVs taking image aspect ratio into account",
+        default=True)
+    use_subsurf_data = BoolProperty(
+        name="Use Subsurf Modifier",
+        description="""Map UVs taking vertex position after subsurf
+                       into account""",
+        default=False)
+    margin = FloatProperty(
+        name="Margin",
+        description="Space between islands",
+        max=1.0,
+        min=0.0,
+        default=0.001)
+
+    # property for this operation
+    u_const = BoolProperty(
+        name="U-Constraint",
+        description="Keep UV U-axis coordinate",
+        default=False
+    )
+    v_const = BoolProperty(
+        name="V-Constraint",
+        description="Keep UV V-axis coordinate",
+        default=False
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+
+        # bpy.ops.uv.unwrap() makes one UV map at least
+        if not bm.loops.layers.uv:
+            self.report({'WARNING'}, "Object must have more than one UV map")
+            return {'CANCELLED'}
+        uv_layer = bm.loops.layers.uv.verify()
+
+        # get original UV coordinate
+        faces = [f for f in bm.faces if f.select]
+        uv_list = []
+        for f in faces:
+            uvs = [l[uv_layer].uv.copy() for l in f.loops]
+            uv_list.append(uvs)
+
+        # unwrap
+        bpy.ops.uv.unwrap(
+            method=self.method,
+            fill_holes=self.fill_holes,
+            correct_aspect=self.correct_aspect,
+            use_subsurf_data=self.use_subsurf_data,
+            margin=self.margin)
+
+        # when U/V-Constraint is checked, revert original coordinate
+        for f, uvs in zip(faces, uv_list):
+            for l, uv in zip(f.loops, uvs):
+                if self.u_const:
+                    l[uv_layer].uv.x = uv.x
+                if self.v_const:
+                    l[uv_layer].uv.y = uv.y
+
+        # update mesh
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/uv_bounding_box.py b/magic_uv/op/uv_bounding_box.py
new file mode 100644
index 00000000..38d665e1
--- /dev/null
+++ b/magic_uv/op/uv_bounding_box.py
@@ -0,0 +1,842 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+from enum import IntEnum
+import math
+
+import bpy
+import mathutils
+import bmesh
+from bpy.props import BoolProperty, EnumProperty
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+if compat.check_version(2, 80, 0) >= 0:
+    from ..lib import bglx as bgl
+else:
+    import bgl
+
+
+MAX_VALUE = 100000.0
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # 'IMAGE_EDITOR' and 'VIEW_3D' space is allowed to execute.
+    # If 'View_3D' space is not allowed, you can't find option in Tool-Shelf
+    # after the execution
+    for space in context.area.spaces:
+        if (space.type == 'IMAGE_EDITOR') or (space.type == 'VIEW_3D'):
+            break
+    else:
+        return False
+
+    return True
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "uv_bounding_box"
+
+    @classmethod
+    def init_props(cls, scene):
+        class Props():
+            uv_info_ini = []
+            ctrl_points_ini = []
+            ctrl_points = []
+
+        scene.muv_props.uv_bounding_box = Props()
+
+        def get_func(_):
+            return MUV_OT_UVBoundingBox.is_running(bpy.context)
+
+        def set_func(_, __):
+            pass
+
+        def update_func(_, __):
+            bpy.ops.uv.muv_ot_uv_bounding_box('INVOKE_REGION_WIN')
+
+        scene.muv_uv_bounding_box_enabled = BoolProperty(
+            name="UV Bounding Box Enabled",
+            description="UV Bounding Box is enabled",
+            default=False
+        )
+        scene.muv_uv_bounding_box_show = BoolProperty(
+            name="UV Bounding Box Showed",
+            description="UV Bounding Box is showed",
+            default=False,
+            get=get_func,
+            set=set_func,
+            update=update_func
+        )
+        scene.muv_uv_bounding_box_uniform_scaling = BoolProperty(
+            name="Uniform Scaling",
+            description="Enable Uniform Scaling",
+            default=False
+        )
+        scene.muv_uv_bounding_box_boundary = EnumProperty(
+            name="Boundary",
+            description="Boundary",
+            default='UV_SEL',
+            items=[
+                ('UV', "UV", "Boundary is decided by UV"),
+                ('UV_SEL', "UV (Selected)",
+                 "Boundary is decided by Selected UV")
+            ]
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_props.uv_bounding_box
+        del scene.muv_uv_bounding_box_enabled
+        del scene.muv_uv_bounding_box_show
+        del scene.muv_uv_bounding_box_uniform_scaling
+        del scene.muv_uv_bounding_box_boundary
+
+
+class CommandBase:
+    """
+    Custom class: Base class of command
+    """
+
+    def __init__(self):
+        self.op = 'NONE'        # operation
+
+    def to_matrix(self):
+        # mat = I
+        mat = mathutils.Matrix()
+        mat.identity()
+        return mat
+
+
+class TranslationCommand(CommandBase):
+    """
+    Custom class: Translation operation
+    """
+
+    def __init__(self, ix, iy):
+        super().__init__()
+        self.op = 'TRANSLATION'
+        self.__x = ix       # current x
+        self.__y = iy       # current y
+        self.__ix = ix      # initial x
+        self.__iy = iy      # initial y
+
+    def to_matrix(self):
+        # mat = Mt
+        dx = self.__x - self.__ix
+        dy = self.__y - self.__iy
+        return mathutils.Matrix.Translation((dx, dy, 0))
+
+    def set(self, x, y):
+        self.__x = x
+        self.__y = y
+
+
+class RotationCommand(CommandBase):
+    """
+    Custom class: Rotation operation
+    """
+
+    def __init__(self, ix, iy, cx, cy):
+        super().__init__()
+        self.op = 'ROTATION'
+        self.__x = ix       # current x
+        self.__y = iy       # current y
+        self.__cx = cx      # center of rotation x
+        self.__cy = cy      # center of rotation y
+        dx = self.__x - self.__cx
+        dy = self.__y - self.__cy
+        self.__iangle = math.atan2(dy, dx)      # initial rotation angle
+
+    def to_matrix(self):
+        # mat = Mt * Mr * Mt^-1
+        dx = self.__x - self.__cx
+        dy = self.__y - self.__cy
+        angle = math.atan2(dy, dx) - self.__iangle
+        mti = mathutils.Matrix.Translation((-self.__cx, -self.__cy, 0.0))
+        mr = mathutils.Matrix.Rotation(angle, 4, 'Z')
+        mt = mathutils.Matrix.Translation((self.__cx, self.__cy, 0.0))
+        return compat.matmul(compat.matmul(mt, mr), mti)
+
+    def set(self, x, y):
+        self.__x = x
+        self.__y = y
+
+
+class ScalingCommand(CommandBase):
+    """
+    Custom class: Scaling operation
+    """
+
+    def __init__(self, ix, iy, ox, oy, dir_x, dir_y, mat):
+        super().__init__()
+        self.op = 'SCALING'
+        self.__ix = ix          # initial x
+        self.__iy = iy          # initial y
+        self.__x = ix           # current x
+        self.__y = iy           # current y
+        self.__ox = ox          # origin of scaling x
+        self.__oy = oy          # origin of scaling y
+        self.__dir_x = dir_x    # direction of scaling x
+        self.__dir_y = dir_y    # direction of scaling y
+        self.__mat = mat
+        # initial origin of scaling = M(to original transform) * (ox, oy)
+        iov = compat.matmul(mat, mathutils.Vector((ox, oy, 0.0)))
+        self.__iox = iov.x      # initial origin of scaling X
+        self.__ioy = iov.y      # initial origin of scaling y
+
+    def to_matrix(self):
+        """
+        mat = M(to original transform)^-1 * Mt(to origin) * Ms *
+              Mt(to origin)^-1 * M(to original transform)
+        """
+        m = self.__mat
+        mi = self.__mat.inverted()
+        mtoi = mathutils.Matrix.Translation((-self.__iox, -self.__ioy, 0.0))
+        mto = mathutils.Matrix.Translation((self.__iox, self.__ioy, 0.0))
+        # every point must be transformed to origin
+        t = compat.matmul(m, mathutils.Vector((self.__ix, self.__iy, 0.0)))
+        tix, tiy = t.x, t.y
+        t = compat.matmul(m, mathutils.Vector((self.__ox, self.__oy, 0.0)))
+        tox, toy = t.x, t.y
+        t = compat.matmul(m, mathutils.Vector((self.__x, self.__y, 0.0)))
+        tx, ty = t.x, t.y
+        ms = mathutils.Matrix()
+        ms.identity()
+        if self.__dir_x == 1:
+            ms[0][0] = (tx - tox) * self.__dir_x / (tix - tox)
+        if self.__dir_y == 1:
+            ms[1][1] = (ty - toy) * self.__dir_y / (tiy - toy)
+        return compat.matmul(compat.matmul(compat.matmul(
+            compat.matmul(mi, mto), ms), mtoi), m)
+
+    def set(self, x, y):
+        self.__x = x
+        self.__y = y
+
+
+class UniformScalingCommand(CommandBase):
+    """
+    Custom class: Uniform Scaling operation
+    """
+
+    def __init__(self, ix, iy, ox, oy, mat):
+        super().__init__()
+        self.op = 'SCALING'
+        self.__ix = ix          # initial x
+        self.__iy = iy          # initial y
+        self.__x = ix           # current x
+        self.__y = iy           # current y
+        self.__ox = ox          # origin of scaling x
+        self.__oy = oy          # origin of scaling y
+        self.__mat = mat
+        # initial origin of scaling = M(to original transform) * (ox, oy)
+        iov = compat.matmul(mat, mathutils.Vector((ox, oy, 0.0)))
+        self.__iox = iov.x      # initial origin of scaling x
+        self.__ioy = iov.y      # initial origin of scaling y
+        self.__dir_x = 1
+        self.__dir_y = 1
+
+    def to_matrix(self):
+        """
+        mat = M(to original transform)^-1 * Mt(to origin) * Ms *
+              Mt(to origin)^-1 * M(to original transform)
+        """
+        m = self.__mat
+        mi = self.__mat.inverted()
+        mtoi = mathutils.Matrix.Translation((-self.__iox, -self.__ioy, 0.0))
+        mto = mathutils.Matrix.Translation((self.__iox, self.__ioy, 0.0))
+        # every point must be transformed to origin
+        t = compat.matmul(m, mathutils.Vector((self.__ix, self.__iy, 0.0)))
+        tix, tiy = t.x, t.y
+        t = compat.matmul(m, mathutils.Vector((self.__ox, self.__oy, 0.0)))
+        tox, toy = t.x, t.y
+        t = compat.matmul(m, mathutils.Vector((self.__x, self.__y, 0.0)))
+        tx, ty = t.x, t.y
+        ms = mathutils.Matrix()
+        ms.identity()
+        tir = math.sqrt((tix - tox) * (tix - tox) + (tiy - toy) * (tiy - toy))
+        tr = math.sqrt((tx - tox) * (tx - tox) + (ty - toy) * (ty - toy))
+
+        sr = tr / tir
+
+        if ((tx - tox) * (tix - tox)) > 0:
+            self.__dir_x = 1
+        else:
+            self.__dir_x = -1
+        if ((ty - toy) * (tiy - toy)) > 0:
+            self.__dir_y = 1
+        else:
+            self.__dir_y = -1
+
+        ms[0][0] = sr * self.__dir_x
+        ms[1][1] = sr * self.__dir_y
+
+        return compat.matmul(compat.matmul(compat.matmul(
+            compat.matmul(mi, mto), ms), mtoi), m)
+
+    def set(self, x, y):
+        self.__x = x
+        self.__y = y
+
+
+class CommandExecuter:
+    """
+    Custom class: manage command history and execute command
+    """
+
+    def __init__(self):
+        self.__cmd_list = []        # history
+        self.__cmd_list_redo = []   # redo list
+
+    def execute(self, begin=0, end=-1):
+        """
+        create matrix from history
+        """
+        mat = mathutils.Matrix()
+        mat.identity()
+        for i, cmd in enumerate(self.__cmd_list):
+            if begin <= i and (end == -1 or i <= end):
+                mat = compat.matmul(cmd.to_matrix(), mat)
+        return mat
+
+    def undo_size(self):
+        """
+        get history size
+        """
+        return len(self.__cmd_list)
+
+    def top(self):
+        """
+        get top of history
+        """
+        if len(self.__cmd_list) <= 0:
+            return None
+        return self.__cmd_list[-1]
+
+    def append(self, cmd):
+        """
+        append command
+        """
+        self.__cmd_list.append(cmd)
+        self.__cmd_list_redo = []
+
+    def undo(self):
+        """
+        undo command
+        """
+        if len(self.__cmd_list) <= 0:
+            return
+        self.__cmd_list_redo.append(self.__cmd_list.pop())
+
+    def redo(self):
+        """
+        redo command
+        """
+        if len(self.__cmd_list_redo) <= 0:
+            return
+        self.__cmd_list.append(self.__cmd_list_redo.pop())
+
+    def pop(self):
+        if len(self.__cmd_list) <= 0:
+            return None
+        return self.__cmd_list.pop()
+
+    def push(self, cmd):
+        self.__cmd_list.append(cmd)
+
+
+class State(IntEnum):
+    """
+    Enum: State definition used by MUV_UVBBStateMgr
+    """
+    NONE = 0
+    TRANSLATING = 1
+    SCALING_1 = 2
+    SCALING_2 = 3
+    SCALING_3 = 4
+    SCALING_4 = 5
+    SCALING_5 = 6
+    SCALING_6 = 7
+    SCALING_7 = 8
+    SCALING_8 = 9
+    ROTATING = 10
+    UNIFORM_SCALING_1 = 11
+    UNIFORM_SCALING_2 = 12
+    UNIFORM_SCALING_3 = 13
+    UNIFORM_SCALING_4 = 14
+
+
+class StateBase:
+    """
+    Custom class: Base class of state
+    """
+
+    def __init__(self):
+        pass
+
+    def update(self, context, event, ctrl_points, mouse_view):
+        raise NotImplementedError
+
+
+class StateNone(StateBase):
+    """
+    Custom class:
+    No state
+    Wait for event from mouse
+    """
+
+    def __init__(self, cmd_exec):
+        super().__init__()
+        self.__cmd_exec = cmd_exec
+
+    def update(self, context, event, ctrl_points, mouse_view):
+        """
+        Update state
+        """
+        user_prefs = compat.get_user_preferences(context)
+        prefs = user_prefs.addons["magic_uv"].preferences
+        cp_react_size = prefs.uv_bounding_box_cp_react_size
+        is_uscaling = context.scene.muv_uv_bounding_box_uniform_scaling
+        if (event.type == 'LEFTMOUSE') and (event.value == 'PRESS'):
+            x, y = context.region.view2d.view_to_region(
+                mouse_view.x, mouse_view.y)
+            for i, p in enumerate(ctrl_points):
+                px, py = context.region.view2d.view_to_region(p.x, p.y)
+                in_cp_x = (px + cp_react_size > x and
+                           px - cp_react_size < x)
+                in_cp_y = (py + cp_react_size > y and
+                           py - cp_react_size < y)
+                if in_cp_x and in_cp_y:
+                    if is_uscaling:
+                        arr = [1, 3, 6, 8]
+                        if i in arr:
+                            return (
+                                State.UNIFORM_SCALING_1 +
+                                arr.index(i)
+                            )
+                    else:
+                        return State.TRANSLATING + i
+
+        return State.NONE
+
+
+class StateTranslating(StateBase):
+    """
+    Custom class: Translating state
+    """
+
+    def __init__(self, cmd_exec, ctrl_points):
+        super().__init__()
+        self.__cmd_exec = cmd_exec
+        ix, iy = ctrl_points[0].x, ctrl_points[0].y
+        self.__cmd_exec.append(TranslationCommand(ix, iy))
+
+    def update(self, context, event, ctrl_points, mouse_view):
+        if event.type == 'LEFTMOUSE':
+            if event.value == 'RELEASE':
+                return State.NONE
+        if event.type == 'MOUSEMOVE':
+            x, y = mouse_view.x, mouse_view.y
+            self.__cmd_exec.top().set(x, y)
+        return State.TRANSLATING
+
+
+class StateScaling(StateBase):
+    """
+    Custom class: Scaling state
+    """
+
+    def __init__(self, cmd_exec, state, ctrl_points):
+        super().__init__()
+        self.__state = state
+        self.__cmd_exec = cmd_exec
+        dir_x_list = [1, 1, 1, 0, 0, 1, 1, 1]
+        dir_y_list = [1, 0, 1, 1, 1, 1, 0, 1]
+        idx = state - 2
+        ix, iy = ctrl_points[idx + 1].x, ctrl_points[idx + 1].y
+        ox, oy = ctrl_points[8 - idx].x, ctrl_points[8 - idx].y
+        dir_x, dir_y = dir_x_list[idx], dir_y_list[idx]
+        mat = self.__cmd_exec.execute(end=self.__cmd_exec.undo_size())
+        self.__cmd_exec.append(
+            ScalingCommand(ix, iy, ox, oy, dir_x, dir_y, mat.inverted()))
+
+    def update(self, context, event, ctrl_points, mouse_view):
+        if event.type == 'LEFTMOUSE':
+            if event.value == 'RELEASE':
+                return State.NONE
+        if event.type == 'MOUSEMOVE':
+            x, y = mouse_view.x, mouse_view.y
+            self.__cmd_exec.top().set(x, y)
+        return self.__state
+
+
+class StateUniformScaling(StateBase):
+    """
+    Custom class: Uniform Scaling state
+    """
+
+    def __init__(self, cmd_exec, state, ctrl_points):
+        super().__init__()
+        self.__state = state
+        self.__cmd_exec = cmd_exec
+        icp_idx = [1, 3, 6, 8]
+        ocp_idx = [8, 6, 3, 1]
+        idx = state - State.UNIFORM_SCALING_1
+        ix, iy = ctrl_points[icp_idx[idx]].x, ctrl_points[icp_idx[idx]].y
+        ox, oy = ctrl_points[ocp_idx[idx]].x, ctrl_points[ocp_idx[idx]].y
+        mat = self.__cmd_exec.execute(end=self.__cmd_exec.undo_size())
+        self.__cmd_exec.append(UniformScalingCommand(
+            ix, iy, ox, oy, mat.inverted()))
+
+    def update(self, context, event, ctrl_points, mouse_view):
+        if event.type == 'LEFTMOUSE':
+            if event.value == 'RELEASE':
+                return State.NONE
+        if event.type == 'MOUSEMOVE':
+            x, y = mouse_view.x, mouse_view.y
+            self.__cmd_exec.top().set(x, y)
+
+        return self.__state
+
+
+class StateRotating(StateBase):
+    """
+    Custom class: Rotating state
+    """
+
+    def __init__(self, cmd_exec, ctrl_points):
+        super().__init__()
+        self.__cmd_exec = cmd_exec
+        ix, iy = ctrl_points[9].x, ctrl_points[9].y
+        ox, oy = ctrl_points[0].x, ctrl_points[0].y
+        self.__cmd_exec.append(RotationCommand(ix, iy, ox, oy))
+
+    def update(self, context, event, ctrl_points, mouse_view):
+        if event.type == 'LEFTMOUSE':
+            if event.value == 'RELEASE':
+                return State.NONE
+        if event.type == 'MOUSEMOVE':
+            x, y = mouse_view.x, mouse_view.y
+            self.__cmd_exec.top().set(x, y)
+        return State.ROTATING
+
+
+class StateManager:
+    """
+    Custom class: Manage state about this feature
+    """
+
+    def __init__(self, cmd_exec):
+        self.__cmd_exec = cmd_exec          # command executer
+        self.__state = State.NONE   # current state
+        self.__state_obj = StateNone(self.__cmd_exec)
+
+    def __update_state(self, next_state, ctrl_points):
+        """
+        Update state
+        """
+
+        if next_state == self.__state:
+            return
+        obj = None
+        if next_state == State.TRANSLATING:
+            obj = StateTranslating(self.__cmd_exec, ctrl_points)
+        elif State.SCALING_1 <= next_state <= State.SCALING_8:
+            obj = StateScaling(
+                self.__cmd_exec, next_state, ctrl_points)
+        elif next_state == State.ROTATING:
+            obj = StateRotating(self.__cmd_exec, ctrl_points)
+        elif next_state == State.NONE:
+            obj = StateNone(self.__cmd_exec)
+        elif (State.UNIFORM_SCALING_1 <= next_state <=
+              State.UNIFORM_SCALING_4):
+            obj = StateUniformScaling(
+                self.__cmd_exec, next_state, ctrl_points)
+
+        if obj is not None:
+            self.__state_obj = obj
+
+        self.__state = next_state
+
+    def update(self, context, ctrl_points, event):
+        mouse_region = mathutils.Vector((
+            event.mouse_region_x, event.mouse_region_y))
+        mouse_view = mathutils.Vector((context.region.view2d.region_to_view(
+            mouse_region.x, mouse_region.y)))
+        next_state = self.__state_obj.update(
+            context, event, ctrl_points, mouse_view)
+        self.__update_state(next_state, ctrl_points)
+
+        return self.__state
+
+
+@BlClassRegistry()
+class MUV_OT_UVBoundingBox(bpy.types.Operator):
+    """
+    Operation class: UV Bounding Box
+    """
+
+    bl_idname = "uv.muv_ot_uv_bounding_box"
+    bl_label = "UV Bounding Box"
+    bl_description = "Internal operation for UV Bounding Box"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    def __init__(self):
+        self.__timer = None
+        self.__cmd_exec = CommandExecuter()         # Command executor
+        self.__state_mgr = StateManager(self.__cmd_exec)   # State Manager
+
+    __handle = None
+    __timer = None
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return False
+        return _is_valid_context(context)
+
+    @classmethod
+    def is_running(cls, _):
+        return 1 if cls.__handle else 0
+
+    @classmethod
+    def handle_add(cls, obj, context):
+        if cls.__handle is None:
+            sie = bpy.types.SpaceImageEditor
+            cls.__handle = sie.draw_handler_add(
+                cls.draw_bb, (obj, context), "WINDOW", "POST_PIXEL")
+        if cls.__timer is None:
+            cls.__timer = context.window_manager.event_timer_add(
+                0.1, window=context.window)
+            context.window_manager.modal_handler_add(obj)
+
+    @classmethod
+    def handle_remove(cls, context):
+        if cls.__handle is not None:
+            sie = bpy.types.SpaceImageEditor
+            sie.draw_handler_remove(cls.__handle, "WINDOW")
+            cls.__handle = None
+        if cls.__timer is not None:
+            context.window_manager.event_timer_remove(cls.__timer)
+            cls.__timer = None
+
+    @classmethod
+    def __draw_ctrl_point(cls, context, pos):
+        """
+        Draw control point
+        """
+        user_prefs = compat.get_user_preferences(context)
+        prefs = user_prefs.addons["magic_uv"].preferences
+        cp_size = prefs.uv_bounding_box_cp_size
+        offset = cp_size / 2
+        verts = [
+            [pos.x - offset, pos.y - offset],
+            [pos.x - offset, pos.y + offset],
+            [pos.x + offset, pos.y + offset],
+            [pos.x + offset, pos.y - offset]
+        ]
+        bgl.glEnable(bgl.GL_BLEND)
+        bgl.glBegin(bgl.GL_QUADS)
+        bgl.glColor4f(1.0, 1.0, 1.0, 1.0)
+        for (x, y) in verts:
+            bgl.glVertex2f(x, y)
+        bgl.glEnd()
+
+    @classmethod
+    def draw_bb(cls, _, context):
+        """
+        Draw bounding box
+        """
+        props = context.scene.muv_props.uv_bounding_box
+
+        if not MUV_OT_UVBoundingBox.is_running(context):
+            return
+
+        if not _is_valid_context(context):
+            return
+
+        for cp in props.ctrl_points:
+            cls.__draw_ctrl_point(
+                context, mathutils.Vector(
+                    context.region.view2d.view_to_region(cp.x, cp.y)))
+
+    def __get_uv_info(self, context):
+        """
+        Get UV coordinate
+        """
+        sc = context.scene
+        obj = context.active_object
+        uv_info = []
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+        if not bm.loops.layers.uv:
+            return None
+        uv_layer = bm.loops.layers.uv.verify()
+        for f in bm.faces:
+            if not f.select:
+                continue
+            for i, l in enumerate(f.loops):
+                if sc.muv_uv_bounding_box_boundary == 'UV_SEL':
+                    if l[uv_layer].select:
+                        uv_info.append((f.index, i, l[uv_layer].uv.copy()))
+                elif sc.muv_uv_bounding_box_boundary == 'UV':
+                    uv_info.append((f.index, i, l[uv_layer].uv.copy()))
+        if not uv_info:
+            return None
+        return uv_info
+
+    def __get_ctrl_point(self, uv_info_ini):
+        """
+        Get control point
+        """
+        left = MAX_VALUE
+        right = -MAX_VALUE
+        top = -MAX_VALUE
+        bottom = MAX_VALUE
+
+        for info in uv_info_ini:
+            uv = info[2]
+            if uv.x < left:
+                left = uv.x
+            if uv.x > right:
+                right = uv.x
+            if uv.y < bottom:
+                bottom = uv.y
+            if uv.y > top:
+                top = uv.y
+
+        points = [
+            mathutils.Vector((
+                (left + right) * 0.5, (top + bottom) * 0.5, 0.0
+            )),
+            mathutils.Vector((left, top, 0.0)),
+            mathutils.Vector((left, (top + bottom) * 0.5, 0.0)),
+            mathutils.Vector((left, bottom, 0.0)),
+            mathutils.Vector(((left + right) * 0.5, top, 0.0)),
+            mathutils.Vector(((left + right) * 0.5, bottom, 0.0)),
+            mathutils.Vector((right, top, 0.0)),
+            mathutils.Vector((right, (top + bottom) * 0.5, 0.0)),
+            mathutils.Vector((right, bottom, 0.0)),
+            mathutils.Vector(((left + right) * 0.5, top + 0.03, 0.0))
+        ]
+
+        return points
+
+    def __update_uvs(self, context, uv_info_ini, trans_mat):
+        """
+        Update UV coordinate
+        """
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+        if not bm.loops.layers.uv:
+            return
+        uv_layer = bm.loops.layers.uv.verify()
+        for info in uv_info_ini:
+            fidx = info[0]
+            lidx = info[1]
+            uv = info[2]
+            v = mathutils.Vector((uv.x, uv.y, 0.0))
+            av = compat.matmul(trans_mat, v)
+            bm.faces[fidx].loops[lidx][uv_layer].uv = mathutils.Vector(
+                (av.x, av.y))
+        bmesh.update_edit_mesh(obj.data)
+
+    def __update_ctrl_point(self, ctrl_points_ini, trans_mat):
+        """
+        Update control point
+        """
+        return [compat.matmul(trans_mat, cp) for cp in ctrl_points_ini]
+
+    def modal(self, context, event):
+        props = context.scene.muv_props.uv_bounding_box
+        common.redraw_all_areas()
+
+        if not MUV_OT_UVBoundingBox.is_running(context):
+            return {'FINISHED'}
+
+        if not _is_valid_context(context):
+            MUV_OT_UVBoundingBox.handle_remove(context)
+            return {'FINISHED'}
+
+        region_types = [
+            'HEADER',
+            'UI',
+            'TOOLS',
+        ]
+        if not common.mouse_on_area(event, 'IMAGE_EDITOR') or \
+           common.mouse_on_regions(event, 'IMAGE_EDITOR', region_types):
+            return {'PASS_THROUGH'}
+
+        if event.type == 'TIMER':
+            trans_mat = self.__cmd_exec.execute()
+            self.__update_uvs(context, props.uv_info_ini, trans_mat)
+            props.ctrl_points = self.__update_ctrl_point(
+                props.ctrl_points_ini, trans_mat)
+
+        state = self.__state_mgr.update(context, props.ctrl_points, event)
+        if state == State.NONE:
+            return {'PASS_THROUGH'}
+
+        return {'RUNNING_MODAL'}
+
+    def invoke(self, context, _):
+        props = context.scene.muv_props.uv_bounding_box
+
+        if MUV_OT_UVBoundingBox.is_running(context):
+            MUV_OT_UVBoundingBox.handle_remove(context)
+            return {'FINISHED'}
+
+        props.uv_info_ini = self.__get_uv_info(context)
+        if props.uv_info_ini is None:
+            return {'CANCELLED'}
+
+        MUV_OT_UVBoundingBox.handle_add(self, context)
+
+        props.ctrl_points_ini = self.__get_ctrl_point(props.uv_info_ini)
+        trans_mat = self.__cmd_exec.execute()
+        # Update is needed in order to display control point
+        self.__update_uvs(context, props.uv_info_ini, trans_mat)
+        props.ctrl_points = self.__update_ctrl_point(
+            props.ctrl_points_ini, trans_mat)
+
+        return {'RUNNING_MODAL'}
diff --git a/magic_uv/op/uv_inspection.py b/magic_uv/op/uv_inspection.py
new file mode 100644
index 00000000..61cbf1ed
--- /dev/null
+++ b/magic_uv/op/uv_inspection.py
@@ -0,0 +1,281 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+from bpy.props import BoolProperty, EnumProperty
+import bmesh
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+if compat.check_version(2, 80, 0) >= 0:
+    from ..lib import bglx as bgl
+else:
+    import bgl
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # 'IMAGE_EDITOR' and 'VIEW_3D' space is allowed to execute.
+    # If 'View_3D' space is not allowed, you can't find option in Tool-Shelf
+    # after the execution
+    for space in context.area.spaces:
+        if (space.type == 'IMAGE_EDITOR') or (space.type == 'VIEW_3D'):
+            break
+    else:
+        return False
+
+    return True
+
+
+def _update_uvinsp_info(context):
+    sc = context.scene
+    props = sc.muv_props.uv_inspection
+
+    obj = context.active_object
+    bm = bmesh.from_edit_mesh(obj.data)
+    if common.check_version(2, 73, 0) >= 0:
+        bm.faces.ensure_lookup_table()
+    uv_layer = bm.loops.layers.uv.verify()
+
+    if context.tool_settings.use_uv_select_sync:
+        sel_faces = [f for f in bm.faces]
+    else:
+        sel_faces = [f for f in bm.faces if f.select]
+    props.overlapped_info = common.get_overlapped_uv_info(
+        bm, sel_faces, uv_layer, sc.muv_uv_inspection_show_mode)
+    props.flipped_info = common.get_flipped_uv_info(sel_faces, uv_layer)
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "uv_inspection"
+
+    @classmethod
+    def init_props(cls, scene):
+        class Props():
+            overlapped_info = []
+            flipped_info = []
+
+        scene.muv_props.uv_inspection = Props()
+
+        def get_func(_):
+            return MUV_OT_UVInspection_Render.is_running(bpy.context)
+
+        def set_func(_, __):
+            pass
+
+        def update_func(_, __):
+            bpy.ops.uv.muv_ot_uv_inspection_render('INVOKE_REGION_WIN')
+
+        scene.muv_uv_inspection_enabled = BoolProperty(
+            name="UV Inspection Enabled",
+            description="UV Inspection is enabled",
+            default=False
+        )
+        scene.muv_uv_inspection_show = BoolProperty(
+            name="UV Inspection Showed",
+            description="UV Inspection is showed",
+            default=False,
+            get=get_func,
+            set=set_func,
+            update=update_func
+        )
+        scene.muv_uv_inspection_show_overlapped = BoolProperty(
+            name="Overlapped",
+            description="Show overlapped UVs",
+            default=False
+        )
+        scene.muv_uv_inspection_show_flipped = BoolProperty(
+            name="Flipped",
+            description="Show flipped UVs",
+            default=False
+        )
+        scene.muv_uv_inspection_show_mode = EnumProperty(
+            name="Mode",
+            description="Show mode",
+            items=[
+                ('PART', "Part", "Show only overlapped/flipped part"),
+                ('FACE', "Face", "Show overlapped/flipped face")
+            ],
+            default='PART'
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_props.uv_inspection
+        del scene.muv_uv_inspection_enabled
+        del scene.muv_uv_inspection_show
+        del scene.muv_uv_inspection_show_overlapped
+        del scene.muv_uv_inspection_show_flipped
+        del scene.muv_uv_inspection_show_mode
+
+
+@BlClassRegistry()
+class MUV_OT_UVInspection_Render(bpy.types.Operator):
+    """
+    Operation class: Render UV Inspection
+    No operation (only rendering)
+    """
+
+    bl_idname = "uv.muv_ot_uv_inspection_render"
+    bl_description = "Render overlapped/flipped UVs"
+    bl_label = "Overlapped/Flipped UV renderer"
+
+    __handle = None
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return False
+        return _is_valid_context(context)
+
+    @classmethod
+    def is_running(cls, _):
+        return 1 if cls.__handle else 0
+
+    @classmethod
+    def handle_add(cls, obj, context):
+        sie = bpy.types.SpaceImageEditor
+        cls.__handle = sie.draw_handler_add(
+            MUV_OT_UVInspection_Render.draw, (obj, context),
+            'WINDOW', 'POST_PIXEL')
+
+    @classmethod
+    def handle_remove(cls):
+        if cls.__handle is not None:
+            bpy.types.SpaceImageEditor.draw_handler_remove(
+                cls.__handle, 'WINDOW')
+            cls.__handle = None
+
+    @staticmethod
+    def draw(_, context):
+        sc = context.scene
+        props = sc.muv_props.uv_inspection
+        user_prefs = compat.get_user_preferences(context)
+        prefs = user_prefs.addons["magic_uv"].preferences
+
+        if not MUV_OT_UVInspection_Render.is_running(context):
+            return
+
+        # OpenGL configuration
+        bgl.glEnable(bgl.GL_BLEND)
+
+        # render overlapped UV
+        if sc.muv_uv_inspection_show_overlapped:
+            color = prefs.uv_inspection_overlapped_color
+            for info in props.overlapped_info:
+                if sc.muv_uv_inspection_show_mode == 'PART':
+                    for poly in info["polygons"]:
+                        bgl.glBegin(bgl.GL_TRIANGLE_FAN)
+                        bgl.glColor4f(color[0], color[1], color[2], color[3])
+                        for uv in poly:
+                            x, y = context.region.view2d.view_to_region(
+                                uv.x, uv.y)
+                            bgl.glVertex2f(x, y)
+                        bgl.glEnd()
+                elif sc.muv_uv_inspection_show_mode == 'FACE':
+                    bgl.glBegin(bgl.GL_TRIANGLE_FAN)
+                    bgl.glColor4f(color[0], color[1], color[2], color[3])
+                    for uv in info["subject_uvs"]:
+                        x, y = context.region.view2d.view_to_region(uv.x, uv.y)
+                        bgl.glVertex2f(x, y)
+                    bgl.glEnd()
+
+        # render flipped UV
+        if sc.muv_uv_inspection_show_flipped:
+            color = prefs.uv_inspection_flipped_color
+            for info in props.flipped_info:
+                if sc.muv_uv_inspection_show_mode == 'PART':
+                    for poly in info["polygons"]:
+                        bgl.glBegin(bgl.GL_TRIANGLE_FAN)
+                        bgl.glColor4f(color[0], color[1], color[2], color[3])
+                        for uv in poly:
+                            x, y = context.region.view2d.view_to_region(
+                                uv.x, uv.y)
+                            bgl.glVertex2f(x, y)
+                        bgl.glEnd()
+                elif sc.muv_uv_inspection_show_mode == 'FACE':
+                    bgl.glBegin(bgl.GL_TRIANGLE_FAN)
+                    bgl.glColor4f(color[0], color[1], color[2], color[3])
+                    for uv in info["uvs"]:
+                        x, y = context.region.view2d.view_to_region(uv.x, uv.y)
+                        bgl.glVertex2f(x, y)
+                    bgl.glEnd()
+
+        bgl.glDisable(bgl.GL_BLEND)
+
+    def invoke(self, context, _):
+        if not MUV_OT_UVInspection_Render.is_running(context):
+            _update_uvinsp_info(context)
+            MUV_OT_UVInspection_Render.handle_add(self, context)
+        else:
+            MUV_OT_UVInspection_Render.handle_remove()
+
+        if context.area:
+            context.area.tag_redraw()
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+class MUV_OT_UVInspection_Update(bpy.types.Operator):
+    """
+    Operation class: Update
+    """
+
+    bl_idname = "uv.muv_ot_uv_inspection_update"
+    bl_label = "Update UV Inspection"
+    bl_description = "Update UV Inspection"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        if not MUV_OT_UVInspection_Render.is_running(context):
+            return False
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        _update_uvinsp_info(context)
+
+        if context.area:
+            context.area.tag_redraw()
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/uv_sculpt.py b/magic_uv/op/uv_sculpt.py
new file mode 100644
index 00000000..de5f1e02
--- /dev/null
+++ b/magic_uv/op/uv_sculpt.py
@@ -0,0 +1,487 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+from math import pi, cos, tan, sin
+
+import bpy
+import bmesh
+from mathutils import Vector
+from bpy_extras import view3d_utils
+from mathutils.bvhtree import BVHTree
+from mathutils.geometry import barycentric_transform
+from bpy.props import (
+    BoolProperty,
+    IntProperty,
+    EnumProperty,
+    FloatProperty,
+)
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+
+if compat.check_version(2, 80, 0) >= 0:
+    from ..lib import bglx as bgl
+else:
+    import bgl
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # only 'VIEW_3D' space is allowed to execute
+    for space in context.area.spaces:
+        if space.type == 'VIEW_3D':
+            break
+    else:
+        return False
+
+    return True
+
+
+def _get_strength(p, len_, factor):
+    f = factor
+
+    if p > len_:
+        return 0.0
+
+    if p < 0.0:
+        return f
+
+    return (len_ - p) * f / len_
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "uv_sculpt"
+
+    @classmethod
+    def init_props(cls, scene):
+        def get_func(_):
+            return MUV_OT_UVSculpt.is_running(bpy.context)
+
+        def set_func(_, __):
+            pass
+
+        def update_func(_, __):
+            bpy.ops.uv.muv_ot_uv_sculpt('INVOKE_REGION_WIN')
+
+        scene.muv_uv_sculpt_enabled = BoolProperty(
+            name="UV Sculpt",
+            description="UV Sculpt is enabled",
+            default=False
+        )
+        scene.muv_uv_sculpt_enable = BoolProperty(
+            name="UV Sculpt Showed",
+            description="UV Sculpt is enabled",
+            default=False,
+            get=get_func,
+            set=set_func,
+            update=update_func
+        )
+        scene.muv_uv_sculpt_radius = IntProperty(
+            name="Radius",
+            description="Radius of the brush",
+            min=1,
+            max=500,
+            default=30
+        )
+        scene.muv_uv_sculpt_strength = FloatProperty(
+            name="Strength",
+            description="How powerful the effect of the brush when applied",
+            min=0.0,
+            max=1.0,
+            default=0.03,
+        )
+        scene.muv_uv_sculpt_tools = EnumProperty(
+            name="Tools",
+            description="Select Tools for the UV sculpt brushes",
+            items=[
+                ('GRAB', "Grab", "Grab UVs"),
+                ('RELAX', "Relax", "Relax UVs"),
+                ('PINCH', "Pinch", "Pinch UVs")
+            ],
+            default='GRAB'
+        )
+        scene.muv_uv_sculpt_show_brush = BoolProperty(
+            name="Show Brush",
+            description="Show Brush",
+            default=True
+        )
+        scene.muv_uv_sculpt_pinch_invert = BoolProperty(
+            name="Invert",
+            description="Pinch UV to invert direction",
+            default=False
+        )
+        scene.muv_uv_sculpt_relax_method = EnumProperty(
+            name="Method",
+            description="Algorithm used for relaxation",
+            items=[
+                ('HC', "HC", "Use HC method for relaxation"),
+                ('LAPLACIAN', "Laplacian",
+                 "Use laplacian method for relaxation")
+            ],
+            default='HC'
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_uv_sculpt_enabled
+        del scene.muv_uv_sculpt_enable
+        del scene.muv_uv_sculpt_radius
+        del scene.muv_uv_sculpt_strength
+        del scene.muv_uv_sculpt_tools
+        del scene.muv_uv_sculpt_show_brush
+        del scene.muv_uv_sculpt_pinch_invert
+        del scene.muv_uv_sculpt_relax_method
+
+
+@BlClassRegistry()
+class MUV_OT_UVSculpt(bpy.types.Operator):
+    """
+    Operation class: UV Sculpt in View3D
+    """
+
+    bl_idname = "uv.muv_ot_uv_sculpt"
+    bl_label = "UV Sculpt"
+    bl_description = "UV Sculpt in View3D"
+    bl_options = {'REGISTER'}
+
+    __handle = None
+    __timer = None
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return False
+        return _is_valid_context(context)
+
+    @classmethod
+    def is_running(cls, _):
+        return 1 if cls.__handle else 0
+
+    @classmethod
+    def handle_add(cls, obj, context):
+        if not cls.__handle:
+            sv = bpy.types.SpaceView3D
+            cls.__handle = sv.draw_handler_add(cls.draw_brush, (obj, context),
+                                               "WINDOW", "POST_PIXEL")
+        if not cls.__timer:
+            cls.__timer = context.window_manager.event_timer_add(
+                0.1, window=context.window)
+            context.window_manager.modal_handler_add(obj)
+
+    @classmethod
+    def handle_remove(cls, context):
+        if cls.__handle:
+            sv = bpy.types.SpaceView3D
+            sv.draw_handler_remove(cls.__handle, "WINDOW")
+            cls.__handle = None
+        if cls.__timer:
+            context.window_manager.event_timer_remove(cls.__timer)
+            cls.__timer = None
+
+    @classmethod
+    def draw_brush(cls, obj, context):
+        sc = context.scene
+        user_prefs = compat.get_user_preferences(context)
+        prefs = user_prefs.addons["magic_uv"].preferences
+
+        num_segment = 180
+        theta = 2 * pi / num_segment
+        fact_t = tan(theta)
+        fact_r = cos(theta)
+        color = prefs.uv_sculpt_brush_color
+
+        bgl.glBegin(bgl.GL_LINE_STRIP)
+        bgl.glColor4f(color[0], color[1], color[2], color[3])
+        x = sc.muv_uv_sculpt_radius * cos(0.0)
+        y = sc.muv_uv_sculpt_radius * sin(0.0)
+        for _ in range(num_segment):
+            bgl.glVertex2f(x + obj.current_mco.x, y + obj.current_mco.y)
+            tx = -y
+            ty = x
+            x = x + tx * fact_t
+            y = y + ty * fact_t
+            x = x * fact_r
+            y = y * fact_r
+        bgl.glEnd()
+
+    def __init__(self):
+        self.__loop_info = []
+        self.__stroking = False
+        self.current_mco = Vector((0.0, 0.0))
+        self.__initial_mco = Vector((0.0, 0.0))
+
+    def __stroke_init(self, context, _):
+        sc = context.scene
+
+        self.__initial_mco = self.current_mco
+
+        # get influenced UV
+        obj = context.active_object
+        world_mat = obj.matrix_world
+        bm = bmesh.from_edit_mesh(obj.data)
+        uv_layer = bm.loops.layers.uv.verify()
+        _, region, space = common.get_space('VIEW_3D', 'WINDOW', 'VIEW_3D')
+
+        self.__loop_info = []
+        for f in bm.faces:
+            if not f.select:
+                continue
+            for i, l in enumerate(f.loops):
+                loc_2d = view3d_utils.location_3d_to_region_2d(
+                    region, space.region_3d,
+                    compat.matmul(world_mat, l.vert.co))
+                diff = loc_2d - self.__initial_mco
+                if diff.length < sc.muv_uv_sculpt_radius:
+                    info = {
+                        "face_idx": f.index,
+                        "loop_idx": i,
+                        "initial_vco": l.vert.co.copy(),
+                        "initial_vco_2d": loc_2d,
+                        "initial_uv": l[uv_layer].uv.copy(),
+                        "strength": _get_strength(
+                            diff.length, sc.muv_uv_sculpt_radius,
+                            sc.muv_uv_sculpt_strength)
+                    }
+                    self.__loop_info.append(info)
+
+    def __stroke_apply(self, context, _):
+        sc = context.scene
+        obj = context.active_object
+        world_mat = obj.matrix_world
+        bm = bmesh.from_edit_mesh(obj.data)
+        uv_layer = bm.loops.layers.uv.verify()
+        mco = self.current_mco
+
+        if sc.muv_uv_sculpt_tools == 'GRAB':
+            for info in self.__loop_info:
+                diff_uv = (mco - self.__initial_mco) * info["strength"]
+                l = bm.faces[info["face_idx"]].loops[info["loop_idx"]]
+                l[uv_layer].uv = info["initial_uv"] + diff_uv / 100.0
+
+        elif sc.muv_uv_sculpt_tools == 'PINCH':
+            _, region, space = common.get_space('VIEW_3D', 'WINDOW', 'VIEW_3D')
+            loop_info = []
+            for f in bm.faces:
+                if not f.select:
+                    continue
+                for i, l in enumerate(f.loops):
+                    loc_2d = view3d_utils.location_3d_to_region_2d(
+                        region, space.region_3d,
+                        compat.matmul(world_mat, l.vert.co))
+                    diff = loc_2d - self.__initial_mco
+                    if diff.length < sc.muv_uv_sculpt_radius:
+                        info = {
+                            "face_idx": f.index,
+                            "loop_idx": i,
+                            "initial_vco": l.vert.co.copy(),
+                            "initial_vco_2d": loc_2d,
+                            "initial_uv": l[uv_layer].uv.copy(),
+                            "strength": _get_strength(
+                                diff.length, sc.muv_uv_sculpt_radius,
+                                sc.muv_uv_sculpt_strength)
+                        }
+                        loop_info.append(info)
+
+            # mouse coordinate to UV coordinate
+            ray_vec = view3d_utils.region_2d_to_vector_3d(region,
+                                                          space.region_3d, mco)
+            ray_vec.normalize()
+            ray_orig = view3d_utils.region_2d_to_origin_3d(region,
+                                                           space.region_3d,
+                                                           mco)
+            ray_tgt = ray_orig + ray_vec * 1000000.0
+            mwi = world_mat.inverted()
+            ray_orig_obj = compat.matmul(mwi, ray_orig)
+            ray_tgt_obj = compat.matmul(mwi, ray_tgt)
+            ray_dir_obj = ray_tgt_obj - ray_orig_obj
+            ray_dir_obj.normalize()
+            tree = BVHTree.FromBMesh(bm)
+            loc, _, fidx, _ = tree.ray_cast(ray_orig_obj, ray_dir_obj)
+            if not loc:
+                return
+            loops = [l for l in bm.faces[fidx].loops]
+            uvs = [Vector((l[uv_layer].uv.x, l[uv_layer].uv.y, 0.0))
+                   for l in loops]
+            target_uv = barycentric_transform(
+                loc, loops[0].vert.co, loops[1].vert.co, loops[2].vert.co,
+                uvs[0], uvs[1], uvs[2])
+            target_uv = Vector((target_uv.x, target_uv.y))
+
+            # move to target UV coordinate
+            for info in loop_info:
+                l = bm.faces[info["face_idx"]].loops[info["loop_idx"]]
+                if sc.muv_uv_sculpt_pinch_invert:
+                    diff_uv = (l[uv_layer].uv - target_uv) * info["strength"]
+                else:
+                    diff_uv = (target_uv - l[uv_layer].uv) * info["strength"]
+                l[uv_layer].uv = l[uv_layer].uv + diff_uv / 10.0
+
+        elif sc.muv_uv_sculpt_tools == 'RELAX':
+            _, region, space = common.get_space('VIEW_3D', 'WINDOW', 'VIEW_3D')
+
+            # get vertex and loop relation
+            vert_db = {}
+            for f in bm.faces:
+                for l in f.loops:
+                    if l.vert in vert_db:
+                        vert_db[l.vert]["loops"].append(l)
+                    else:
+                        vert_db[l.vert] = {"loops": [l]}
+
+            # get relaxation information
+            for k in vert_db.keys():
+                d = vert_db[k]
+                d["uv_sum"] = Vector((0.0, 0.0))
+                d["uv_count"] = 0
+
+                for l in d["loops"]:
+                    ln = l.link_loop_next
+                    lp = l.link_loop_prev
+                    d["uv_sum"] = d["uv_sum"] + ln[uv_layer].uv
+                    d["uv_sum"] = d["uv_sum"] + lp[uv_layer].uv
+                    d["uv_count"] = d["uv_count"] + 2
+                d["uv_p"] = d["uv_sum"] / d["uv_count"]
+                d["uv_b"] = d["uv_p"] - d["loops"][0][uv_layer].uv
+            for k in vert_db.keys():
+                d = vert_db[k]
+                d["uv_sum_b"] = Vector((0.0, 0.0))
+                for l in d["loops"]:
+                    ln = l.link_loop_next
+                    lp = l.link_loop_prev
+                    dn = vert_db[ln.vert]
+                    dp = vert_db[lp.vert]
+                    d["uv_sum_b"] = d["uv_sum_b"] + dn["uv_b"] + dp["uv_b"]
+
+            # apply
+            for f in bm.faces:
+                if not f.select:
+                    continue
+                for i, l in enumerate(f.loops):
+                    loc_2d = view3d_utils.location_3d_to_region_2d(
+                        region, space.region_3d,
+                        compat.matmul(world_mat, l.vert.co))
+                    diff = loc_2d - self.__initial_mco
+                    if diff.length >= sc.muv_uv_sculpt_radius:
+                        continue
+                    db = vert_db[l.vert]
+                    strength = _get_strength(diff.length,
+                                             sc.muv_uv_sculpt_radius,
+                                             sc.muv_uv_sculpt_strength)
+
+                    base = (1.0 - strength) * l[uv_layer].uv
+                    if sc.muv_uv_sculpt_relax_method == 'HC':
+                        t = 0.5 * (db["uv_b"] + db["uv_sum_b"] / d["uv_count"])
+                        diff = strength * (db["uv_p"] - t)
+                        target_uv = base + diff
+                    elif sc.muv_uv_sculpt_relax_method == 'LAPLACIAN':
+                        diff = strength * db["uv_p"]
+                        target_uv = base + diff
+                    else:
+                        continue
+
+                    l[uv_layer].uv = target_uv
+
+        bmesh.update_edit_mesh(obj.data)
+
+    def __stroke_exit(self, context, _):
+        sc = context.scene
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        uv_layer = bm.loops.layers.uv.verify()
+        mco = self.current_mco
+
+        if sc.muv_uv_sculpt_tools == 'GRAB':
+            for info in self.__loop_info:
+                diff_uv = (mco - self.__initial_mco) * info["strength"]
+                l = bm.faces[info["face_idx"]].loops[info["loop_idx"]]
+                l[uv_layer].uv = info["initial_uv"] + diff_uv / 100.0
+
+        bmesh.update_edit_mesh(obj.data)
+
+    def modal(self, context, event):
+        if context.area:
+            context.area.tag_redraw()
+
+        if not MUV_OT_UVSculpt.is_running(context):
+            MUV_OT_UVSculpt.handle_remove(context)
+            return {'FINISHED'}
+
+        self.current_mco = Vector((event.mouse_region_x, event.mouse_region_y))
+
+        region_types = [
+            'HEADER',
+            'UI',
+            'TOOLS',
+            'TOOL_PROPS',
+        ]
+        if not common.mouse_on_area(event, 'VIEW_3D') or \
+           common.mouse_on_regions(event, 'VIEW_3D', region_types):
+            return {'PASS_THROUGH'}
+
+        if event.type == 'LEFTMOUSE':
+            if event.value == 'PRESS':
+                if not self.__stroking:
+                    self.__stroke_init(context, event)
+                self.__stroking = True
+            elif event.value == 'RELEASE':
+                if self.__stroking:
+                    self.__stroke_exit(context, event)
+                self.__stroking = False
+            return {'RUNNING_MODAL'}
+        elif event.type == 'MOUSEMOVE':
+            if self.__stroking:
+                self.__stroke_apply(context, event)
+            return {'RUNNING_MODAL'}
+        elif event.type == 'TIMER':
+            if self.__stroking:
+                self.__stroke_apply(context, event)
+            return {'RUNNING_MODAL'}
+
+        return {'PASS_THROUGH'}
+
+    def invoke(self, context, _):
+        if context.area:
+            context.area.tag_redraw()
+
+        if MUV_OT_UVSculpt.is_running(context):
+            MUV_OT_UVSculpt.handle_remove(context)
+        else:
+            MUV_OT_UVSculpt.handle_add(self, context)
+
+        return {'RUNNING_MODAL'}
diff --git a/magic_uv/op/uvw.py b/magic_uv/op/uvw.py
new file mode 100644
index 00000000..035dfca3
--- /dev/null
+++ b/magic_uv/op/uvw.py
@@ -0,0 +1,304 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Alexander Milovsky, Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+from math import sin, cos, pi
+
+import bpy
+import bmesh
+from bpy.props import (
+    FloatProperty,
+    FloatVectorProperty,
+    BoolProperty
+)
+from mathutils import Vector
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # only 'VIEW_3D' space is allowed to execute
+    for space in context.area.spaces:
+        if space.type == 'VIEW_3D':
+            break
+    else:
+        return False
+
+    return True
+
+
+def _get_uv_layer(ops_obj, bm, assign_uvmap):
+    # get UV layer
+    if not bm.loops.layers.uv:
+        if assign_uvmap:
+            bm.loops.layers.uv.new()
+        else:
+            ops_obj.report({'WARNING'},
+                           "Object must have more than one UV map")
+            return None
+    uv_layer = bm.loops.layers.uv.verify()
+
+    return uv_layer
+
+
+def _apply_box_map(bm, uv_layer, size, offset, rotation, tex_aspect):
+    scale = 1.0 / size
+
+    sx = 1.0 * scale
+    sy = 1.0 * scale
+    sz = 1.0 * scale
+    ofx = offset[0]
+    ofy = offset[1]
+    ofz = offset[2]
+    rx = rotation[0] * pi / 180.0
+    ry = rotation[1] * pi / 180.0
+    rz = rotation[2] * pi / 180.0
+    aspect = tex_aspect
+
+    sel_faces = [f for f in bm.faces if f.select]
+
+    # update UV coordinate
+    for f in sel_faces:
+        n = f.normal
+        for l in f.loops:
+            co = l.vert.co
+            x = co.x * sx
+            y = co.y * sy
+            z = co.z * sz
+
+            # X-plane
+            if abs(n[0]) >= abs(n[1]) and abs(n[0]) >= abs(n[2]):
+                if n[0] >= 0.0:
+                    u = (y - ofy) * cos(rx) + (z - ofz) * sin(rx)
+                    v = -(y * aspect - ofy) * sin(rx) + \
+                        (z * aspect - ofz) * cos(rx)
+                else:
+                    u = -(y - ofy) * cos(rx) + (z - ofz) * sin(rx)
+                    v = (y * aspect - ofy) * sin(rx) + \
+                        (z * aspect - ofz) * cos(rx)
+            # Y-plane
+            elif abs(n[1]) >= abs(n[0]) and abs(n[1]) >= abs(n[2]):
+                if n[1] >= 0.0:
+                    u = -(x - ofx) * cos(ry) + (z - ofz) * sin(ry)
+                    v = (x * aspect - ofx) * sin(ry) + \
+                        (z * aspect - ofz) * cos(ry)
+                else:
+                    u = (x - ofx) * cos(ry) + (z - ofz) * sin(ry)
+                    v = -(x * aspect - ofx) * sin(ry) + \
+                        (z * aspect - ofz) * cos(ry)
+            # Z-plane
+            else:
+                if n[2] >= 0.0:
+                    u = (x - ofx) * cos(rz) + (y - ofy) * sin(rz)
+                    v = -(x * aspect - ofx) * sin(rz) + \
+                        (y * aspect - ofy) * cos(rz)
+                else:
+                    u = -(x - ofx) * cos(rz) - (y + ofy) * sin(rz)
+                    v = -(x * aspect + ofx) * sin(rz) + \
+                        (y * aspect - ofy) * cos(rz)
+
+            l[uv_layer].uv = Vector((u, v))
+
+
+def _apply_planer_map(bm, uv_layer, size, offset, rotation, tex_aspect):
+    scale = 1.0 / size
+
+    sx = 1.0 * scale
+    sy = 1.0 * scale
+    ofx = offset[0]
+    ofy = offset[1]
+    rz = rotation * pi / 180.0
+    aspect = tex_aspect
+
+    sel_faces = [f for f in bm.faces if f.select]
+
+    # calculate average of normal
+    n_ave = Vector((0.0, 0.0, 0.0))
+    for f in sel_faces:
+        n_ave = n_ave + f.normal
+    q = n_ave.rotation_difference(Vector((0.0, 0.0, 1.0)))
+
+    # update UV coordinate
+    for f in sel_faces:
+        for l in f.loops:
+            co = compat.matmul(q, l.vert.co)
+            x = co.x * sx
+            y = co.y * sy
+
+            u = x * cos(rz) - y * sin(rz) + ofx
+            v = -x * aspect * sin(rz) - y * aspect * cos(rz) + ofy
+
+            l[uv_layer].uv = Vector((u, v))
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "uvw"
+
+    @classmethod
+    def init_props(cls, scene):
+        scene.muv_uvw_enabled = BoolProperty(
+            name="UVW Enabled",
+            description="UVW is enabled",
+            default=False
+        )
+        scene.muv_uvw_assign_uvmap = BoolProperty(
+            name="Assign UVMap",
+            description="Assign UVMap when no UVmaps are available",
+            default=True
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_uvw_enabled
+        del scene.muv_uvw_assign_uvmap
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_UVW_BoxMap(bpy.types.Operator):
+    bl_idname = "uv.muv_ot_uvw_box_map"
+    bl_label = "Box Map"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    size = FloatProperty(
+        name="Size",
+        default=1.0,
+        precision=4
+    )
+    rotation = FloatVectorProperty(
+        name="XYZ Rotation",
+        size=3,
+        default=(0.0, 0.0, 0.0)
+    )
+    offset = FloatVectorProperty(
+        name="XYZ Offset",
+        size=3,
+        default=(0.0, 0.0, 0.0)
+    )
+    tex_aspect = FloatProperty(
+        name="Texture Aspect",
+        default=1.0,
+        precision=4
+    )
+    assign_uvmap = BoolProperty(
+        name="Assign UVMap",
+        description="Assign UVMap when no UVmaps are available",
+        default=True
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+
+        # get UV layer
+        uv_layer = _get_uv_layer(self, bm, self.assign_uvmap)
+        if not uv_layer:
+            return {'CANCELLED'}
+
+        _apply_box_map(bm, uv_layer, self.size, self.offset, self.rotation,
+                       self.tex_aspect)
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_UVW_BestPlanerMap(bpy.types.Operator):
+    bl_idname = "uv.muv_ot_uvw_best_planer_map"
+    bl_label = "Best Planer Map"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    size = FloatProperty(
+        name="Size",
+        default=1.0,
+        precision=4
+    )
+    rotation = FloatProperty(
+        name="XY Rotation",
+        default=0.0
+    )
+    offset = FloatVectorProperty(
+        name="XY Offset",
+        size=2,
+        default=(0.0, 0.0)
+    )
+    tex_aspect = FloatProperty(
+        name="Texture Aspect",
+        default=1.0,
+        precision=4
+    )
+    assign_uvmap = BoolProperty(
+        name="Assign UVMap",
+        description="Assign UVMap when no UVmaps are available",
+        default=True
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+
+        # get UV layer
+        uv_layer = _get_uv_layer(self, bm, self.assign_uvmap)
+        if not uv_layer:
+            return {'CANCELLED'}
+
+        _apply_planer_map(bm, uv_layer, self.size, self.offset, self.rotation,
+                          self.tex_aspect)
+
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}
diff --git a/magic_uv/op/world_scale_uv.py b/magic_uv/op/world_scale_uv.py
new file mode 100644
index 00000000..1d78b8c7
--- /dev/null
+++ b/magic_uv/op/world_scale_uv.py
@@ -0,0 +1,649 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "McBuff, Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+from math import sqrt
+
+import bpy
+from bpy.props import (
+    EnumProperty,
+    FloatProperty,
+    IntVectorProperty,
+    BoolProperty,
+)
+import bmesh
+from mathutils import Vector
+
+from .. import common
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils.property_class_registry import PropertyClassRegistry
+from ..utils import compatibility as compat
+
+
+def _is_valid_context(context):
+    obj = context.object
+
+    # only edit mode is allowed to execute
+    if obj is None:
+        return False
+    if obj.type != 'MESH':
+        return False
+    if context.object.mode != 'EDIT':
+        return False
+
+    # only 'VIEW_3D' space is allowed to execute
+    for space in context.area.spaces:
+        if space.type == 'VIEW_3D':
+            break
+    else:
+        return False
+
+    return True
+
+
+def _measure_wsuv_info(obj, tex_size=None):
+    mesh_area = common.measure_mesh_area(obj)
+    uv_area = common.measure_uv_area(obj, tex_size)
+
+    if not uv_area:
+        return None, mesh_area, None
+
+    if mesh_area == 0.0:
+        density = 0.0
+    else:
+        density = sqrt(uv_area) / sqrt(mesh_area)
+
+    return uv_area, mesh_area, density
+
+
+def _apply(obj, origin, factor):
+    bm = bmesh.from_edit_mesh(obj.data)
+    if common.check_version(2, 73, 0) >= 0:
+        bm.verts.ensure_lookup_table()
+        bm.edges.ensure_lookup_table()
+        bm.faces.ensure_lookup_table()
+
+    sel_faces = [f for f in bm.faces if f.select]
+
+    uv_layer = bm.loops.layers.uv.verify()
+
+    # calculate origin
+    if origin == 'CENTER':
+        origin = Vector((0.0, 0.0))
+        num = 0
+        for f in sel_faces:
+            for l in f.loops:
+                uv = l[uv_layer].uv
+                origin = origin + uv
+                num = num + 1
+        origin = origin / num
+    elif origin == 'LEFT_TOP':
+        origin = Vector((100000.0, -100000.0))
+        for f in sel_faces:
+            for l in f.loops:
+                uv = l[uv_layer].uv
+                origin.x = min(origin.x, uv.x)
+                origin.y = max(origin.y, uv.y)
+    elif origin == 'LEFT_CENTER':
+        origin = Vector((100000.0, 0.0))
+        num = 0
+        for f in sel_faces:
+            for l in f.loops:
+                uv = l[uv_layer].uv
+                origin.x = min(origin.x, uv.x)
+                origin.y = origin.y + uv.y
+                num = num + 1
+        origin.y = origin.y / num
+    elif origin == 'LEFT_BOTTOM':
+        origin = Vector((100000.0, 100000.0))
+        for f in sel_faces:
+            for l in f.loops:
+                uv = l[uv_layer].uv
+                origin.x = min(origin.x, uv.x)
+                origin.y = min(origin.y, uv.y)
+    elif origin == 'CENTER_TOP':
+        origin = Vector((0.0, -100000.0))
+        num = 0
+        for f in sel_faces:
+            for l in f.loops:
+                uv = l[uv_layer].uv
+                origin.x = origin.x + uv.x
+                origin.y = max(origin.y, uv.y)
+                num = num + 1
+        origin.x = origin.x / num
+    elif origin == 'CENTER_BOTTOM':
+        origin = Vector((0.0, 100000.0))
+        num = 0
+        for f in sel_faces:
+            for l in f.loops:
+                uv = l[uv_layer].uv
+                origin.x = origin.x + uv.x
+                origin.y = min(origin.y, uv.y)
+                num = num + 1
+        origin.x = origin.x / num
+    elif origin == 'RIGHT_TOP':
+        origin = Vector((-100000.0, -100000.0))
+        for f in sel_faces:
+            for l in f.loops:
+                uv = l[uv_layer].uv
+                origin.x = max(origin.x, uv.x)
+                origin.y = max(origin.y, uv.y)
+    elif origin == 'RIGHT_CENTER':
+        origin = Vector((-100000.0, 0.0))
+        num = 0
+        for f in sel_faces:
+            for l in f.loops:
+                uv = l[uv_layer].uv
+                origin.x = max(origin.x, uv.x)
+                origin.y = origin.y + uv.y
+                num = num + 1
+        origin.y = origin.y / num
+    elif origin == 'RIGHT_BOTTOM':
+        origin = Vector((-100000.0, 100000.0))
+        for f in sel_faces:
+            for l in f.loops:
+                uv = l[uv_layer].uv
+                origin.x = max(origin.x, uv.x)
+                origin.y = min(origin.y, uv.y)
+
+    # update UV coordinate
+    for f in sel_faces:
+        for l in f.loops:
+            uv = l[uv_layer].uv
+            diff = uv - origin
+            l[uv_layer].uv = origin + diff * factor
+
+    bmesh.update_edit_mesh(obj.data)
+
+
+@PropertyClassRegistry()
+class _Properties:
+    idname = "world_scale_uv"
+
+    @classmethod
+    def init_props(cls, scene):
+        scene.muv_world_scale_uv_enabled = BoolProperty(
+            name="World Scale UV Enabled",
+            description="World Scale UV is enabled",
+            default=False
+        )
+        scene.muv_world_scale_uv_src_mesh_area = FloatProperty(
+            name="Mesh Area",
+            description="Source Mesh Area",
+            default=0.0,
+            min=0.0
+        )
+        scene.muv_world_scale_uv_src_uv_area = FloatProperty(
+            name="UV Area",
+            description="Source UV Area",
+            default=0.0,
+            min=0.0
+        )
+        scene.muv_world_scale_uv_src_density = FloatProperty(
+            name="Density",
+            description="Source Texel Density",
+            default=0.0,
+            min=0.0
+        )
+        scene.muv_world_scale_uv_tgt_density = FloatProperty(
+            name="Density",
+            description="Target Texel Density",
+            default=0.0,
+            min=0.0
+        )
+        scene.muv_world_scale_uv_tgt_scaling_factor = FloatProperty(
+            name="Scaling Factor",
+            default=1.0,
+            max=1000.0,
+            min=0.00001
+        )
+        scene.muv_world_scale_uv_tgt_texture_size = IntVectorProperty(
+            name="Texture Size",
+            size=2,
+            min=1,
+            soft_max=10240,
+            default=(1024, 1024),
+        )
+        scene.muv_world_scale_uv_mode = EnumProperty(
+            name="Mode",
+            description="Density calculation mode",
+            items=[
+                ('PROPORTIONAL_TO_MESH', "Proportional to Mesh",
+                 "Apply density proportionaled by mesh size"),
+                ('SCALING_DENSITY', "Scaling Density",
+                 "Apply scaled density from source"),
+                ('SAME_DENSITY', "Same Density",
+                 "Apply same density of source"),
+                ('MANUAL', "Manual", "Specify density and size by manual"),
+            ],
+            default='MANUAL'
+        )
+        scene.muv_world_scale_uv_origin = EnumProperty(
+            name="Origin",
+            description="Aspect Origin",
+            items=[
+                ('CENTER', "Center", "Center"),
+                ('LEFT_TOP', "Left Top", "Left Bottom"),
+                ('LEFT_CENTER', "Left Center", "Left Center"),
+                ('LEFT_BOTTOM', "Left Bottom", "Left Bottom"),
+                ('CENTER_TOP', "Center Top", "Center Top"),
+                ('CENTER_BOTTOM', "Center Bottom", "Center Bottom"),
+                ('RIGHT_TOP', "Right Top", "Right Top"),
+                ('RIGHT_CENTER', "Right Center", "Right Center"),
+                ('RIGHT_BOTTOM', "Right Bottom", "Right Bottom")
+
+            ],
+            default='CENTER'
+        )
+
+    @classmethod
+    def del_props(cls, scene):
+        del scene.muv_world_scale_uv_enabled
+        del scene.muv_world_scale_uv_src_mesh_area
+        del scene.muv_world_scale_uv_src_uv_area
+        del scene.muv_world_scale_uv_src_density
+        del scene.muv_world_scale_uv_tgt_density
+        del scene.muv_world_scale_uv_tgt_scaling_factor
+        del scene.muv_world_scale_uv_mode
+        del scene.muv_world_scale_uv_origin
+
+
+@BlClassRegistry()
+class MUV_OT_WorldScaleUV_Measure(bpy.types.Operator):
+    """
+    Operation class: Measure face size
+    """
+
+    bl_idname = "uv.muv_ot_world_scale_uv_measure"
+    bl_label = "Measure World Scale UV"
+    bl_description = "Measure face size for scale calculation"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def execute(self, context):
+        sc = context.scene
+        obj = context.active_object
+
+        uv_area, mesh_area, density = _measure_wsuv_info(obj)
+        if not uv_area:
+            self.report({'WARNING'},
+                        "Object must have more than one UV map and texture")
+            return {'CANCELLED'}
+
+        sc.muv_world_scale_uv_src_uv_area = uv_area
+        sc.muv_world_scale_uv_src_mesh_area = mesh_area
+        sc.muv_world_scale_uv_src_density = density
+
+        self.report({'INFO'},
+                    "UV Area: {0}, Mesh Area: {1}, Texel Density: {2}"
+                    .format(uv_area, mesh_area, density))
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_WorldScaleUV_ApplyManual(bpy.types.Operator):
+    """
+    Operation class: Apply scaled UV (Manual)
+    """
+
+    bl_idname = "uv.muv_ot_world_scale_uv_apply_manual"
+    bl_label = "Apply World Scale UV (Manual)"
+    bl_description = "Apply scaled UV based on user specification"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    tgt_density = FloatProperty(
+        name="Density",
+        description="Target Texel Density",
+        default=1.0,
+        min=0.0
+    )
+    tgt_texture_size = IntVectorProperty(
+        name="Texture Size",
+        size=2,
+        min=1,
+        soft_max=10240,
+        default=(1024, 1024),
+    )
+    origin = EnumProperty(
+        name="Origin",
+        description="Aspect Origin",
+        items=[
+            ('CENTER', "Center", "Center"),
+            ('LEFT_TOP', "Left Top", "Left Bottom"),
+            ('LEFT_CENTER', "Left Center", "Left Center"),
+            ('LEFT_BOTTOM', "Left Bottom", "Left Bottom"),
+            ('CENTER_TOP', "Center Top", "Center Top"),
+            ('CENTER_BOTTOM', "Center Bottom", "Center Bottom"),
+            ('RIGHT_TOP', "Right Top", "Right Top"),
+            ('RIGHT_CENTER', "Right Center", "Right Center"),
+            ('RIGHT_BOTTOM', "Right Bottom", "Right Bottom")
+
+        ],
+        default='CENTER'
+    )
+    show_dialog = BoolProperty(
+        name="Show Diaglog Menu",
+        description="Show dialog menu if true",
+        default=True,
+        options={'HIDDEN', 'SKIP_SAVE'}
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def __apply_manual(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.verts.ensure_lookup_table()
+            bm.edges.ensure_lookup_table()
+            bm.faces.ensure_lookup_table()
+
+        tex_size = self.tgt_texture_size
+        uv_area, _, density = _measure_wsuv_info(obj, tex_size)
+        if not uv_area:
+            self.report({'WARNING'}, "Object must have more than one UV map")
+            return {'CANCELLED'}
+
+        tgt_density = self.tgt_density
+        factor = tgt_density / density
+
+        _apply(context.active_object, self.origin, factor)
+        self.report({'INFO'}, "Scaling factor: {0}".format(factor))
+
+        return {'FINISHED'}
+
+    def draw(self, _):
+        layout = self.layout
+
+        layout.prop(self, "tgt_density")
+        layout.prop(self, "tgt_texture_size")
+        layout.prop(self, "origin")
+
+        layout.separator()
+
+    def invoke(self, context, _):
+        if self.show_dialog:
+            wm = context.window_manager
+            return wm.invoke_props_dialog(self)
+
+        return self.execute(context)
+
+    def execute(self, context):
+        return self.__apply_manual(context)
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_WorldScaleUV_ApplyScalingDensity(bpy.types.Operator):
+    """
+    Operation class: Apply scaled UV (Scaling Density)
+    """
+
+    bl_idname = "uv.muv_ot_world_scale_uv_apply_scaling_density"
+    bl_label = "Apply World Scale UV (Scaling Density)"
+    bl_description = "Apply scaled UV with scaling density"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    tgt_scaling_factor = FloatProperty(
+        name="Scaling Factor",
+        default=1.0,
+        max=1000.0,
+        min=0.00001
+    )
+    origin = EnumProperty(
+        name="Origin",
+        description="Aspect Origin",
+        items=[
+            ('CENTER', "Center", "Center"),
+            ('LEFT_TOP', "Left Top", "Left Bottom"),
+            ('LEFT_CENTER', "Left Center", "Left Center"),
+            ('LEFT_BOTTOM', "Left Bottom", "Left Bottom"),
+            ('CENTER_TOP', "Center Top", "Center Top"),
+            ('CENTER_BOTTOM', "Center Bottom", "Center Bottom"),
+            ('RIGHT_TOP', "Right Top", "Right Top"),
+            ('RIGHT_CENTER', "Right Center", "Right Center"),
+            ('RIGHT_BOTTOM', "Right Bottom", "Right Bottom")
+
+        ],
+        default='CENTER'
+    )
+    src_density = FloatProperty(
+        name="Density",
+        description="Source Texel Density",
+        default=0.0,
+        min=0.0,
+        options={'HIDDEN'}
+    )
+    same_density = BoolProperty(
+        name="Same Density",
+        description="Apply same density",
+        default=False,
+        options={'HIDDEN'}
+    )
+    show_dialog = BoolProperty(
+        name="Show Diaglog Menu",
+        description="Show dialog menu if true",
+        default=True,
+        options={'HIDDEN', 'SKIP_SAVE'}
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def __apply_scaling_density(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.verts.ensure_lookup_table()
+            bm.edges.ensure_lookup_table()
+            bm.faces.ensure_lookup_table()
+
+        uv_area, _, density = _measure_wsuv_info(obj)
+        if not uv_area:
+            self.report({'WARNING'},
+                        "Object must have more than one UV map and texture")
+            return {'CANCELLED'}
+
+        tgt_density = self.src_density * self.tgt_scaling_factor
+        factor = tgt_density / density
+
+        _apply(context.active_object, self.origin, factor)
+        self.report({'INFO'}, "Scaling factor: {0}".format(factor))
+
+        return {'FINISHED'}
+
+    def draw(self, _):
+        layout = self.layout
+
+        layout.label(text="Source:")
+        col = layout.column()
+        col.prop(self, "src_density")
+        col.enabled = False
+
+        layout.separator()
+
+        if not self.same_density:
+            layout.prop(self, "tgt_scaling_factor")
+        layout.prop(self, "origin")
+
+        layout.separator()
+
+    def invoke(self, context, _):
+        sc = context.scene
+
+        if self.show_dialog:
+            wm = context.window_manager
+
+            if self.same_density:
+                self.tgt_scaling_factor = 1.0
+            else:
+                self.tgt_scaling_factor = \
+                    sc.muv_world_scale_uv_tgt_scaling_factor
+                self.src_density = sc.muv_world_scale_uv_src_density
+
+            return wm.invoke_props_dialog(self)
+
+        return self.execute(context)
+
+    def execute(self, context):
+        if self.same_density:
+            self.tgt_scaling_factor = 1.0
+
+        return self.__apply_scaling_density(context)
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_WorldScaleUV_ApplyProportionalToMesh(bpy.types.Operator):
+    """
+    Operation class: Apply scaled UV (Proportional to mesh)
+    """
+
+    bl_idname = "uv.muv_ot_world_scale_uv_apply_proportional_to_mesh"
+    bl_label = "Apply World Scale UV (Proportional to mesh)"
+    bl_description = "Apply scaled UV proportionaled to mesh"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    origin = EnumProperty(
+        name="Origin",
+        description="Aspect Origin",
+        items=[
+            ('CENTER', "Center", "Center"),
+            ('LEFT_TOP', "Left Top", "Left Bottom"),
+            ('LEFT_CENTER', "Left Center", "Left Center"),
+            ('LEFT_BOTTOM', "Left Bottom", "Left Bottom"),
+            ('CENTER_TOP', "Center Top", "Center Top"),
+            ('CENTER_BOTTOM', "Center Bottom", "Center Bottom"),
+            ('RIGHT_TOP', "Right Top", "Right Top"),
+            ('RIGHT_CENTER', "Right Center", "Right Center"),
+            ('RIGHT_BOTTOM', "Right Bottom", "Right Bottom")
+
+        ],
+        default='CENTER'
+    )
+    src_density = FloatProperty(
+        name="Source Density",
+        description="Source Texel Density",
+        default=0.0,
+        min=0.0,
+        options={'HIDDEN'}
+    )
+    src_uv_area = FloatProperty(
+        name="Source UV Area",
+        description="Source UV Area",
+        default=0.0,
+        min=0.0,
+        options={'HIDDEN'}
+    )
+    src_mesh_area = FloatProperty(
+        name="Source Mesh Area",
+        description="Source Mesh Area",
+        default=0.0,
+        min=0.0,
+        options={'HIDDEN'}
+    )
+    show_dialog = BoolProperty(
+        name="Show Diaglog Menu",
+        description="Show dialog menu if true",
+        default=True,
+        options={'HIDDEN', 'SKIP_SAVE'}
+    )
+
+    @classmethod
+    def poll(cls, context):
+        # we can not get area/space/region from console
+        if common.is_console_mode():
+            return True
+        return _is_valid_context(context)
+
+    def __apply_proportional_to_mesh(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+        if common.check_version(2, 73, 0) >= 0:
+            bm.verts.ensure_lookup_table()
+            bm.edges.ensure_lookup_table()
+            bm.faces.ensure_lookup_table()
+
+        uv_area, mesh_area, density = _measure_wsuv_info(obj)
+        if not uv_area:
+            self.report({'WARNING'},
+                        "Object must have more than one UV map and texture")
+            return {'CANCELLED'}
+
+        tgt_density = self.src_density * sqrt(mesh_area) / sqrt(
+            self.src_mesh_area)
+
+        factor = tgt_density / density
+
+        _apply(context.active_object, self.origin, factor)
+        self.report({'INFO'}, "Scaling factor: {0}".format(factor))
+
+        return {'FINISHED'}
+
+    def draw(self, _):
+        layout = self.layout
+
+        layout.label(text="Source:")
+        col = layout.column(align=True)
+        col.prop(self, "src_density")
+        col.prop(self, "src_uv_area")
+        col.prop(self, "src_mesh_area")
+        col.enabled = False
+
+        layout.separator()
+        layout.prop(self, "origin")
+
+        layout.separator()
+
+    def invoke(self, context, _):
+        if self.show_dialog:
+            wm = context.window_manager
+            sc = context.scene
+
+            self.src_density = sc.muv_world_scale_uv_src_density
+            self.src_mesh_area = sc.muv_world_scale_uv_src_mesh_area
+
+            return wm.invoke_props_dialog(self)
+
+        return self.execute(context)
+
+    def execute(self, context):
+        return self.__apply_proportional_to_mesh(context)
diff --git a/magic_uv/preferences.py b/magic_uv/preferences.py
new file mode 100644
index 00000000..3a024488
--- /dev/null
+++ b/magic_uv/preferences.py
@@ -0,0 +1,488 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+from bpy.props import (
+    FloatProperty,
+    FloatVectorProperty,
+    BoolProperty,
+    EnumProperty,
+)
+from bpy.types import AddonPreferences
+
+from . import common
+from .op.flip_rotate_uv import MUV_OT_FlipRotate
+from .op.mirror_uv import MUV_OT_MirrorUV
+from .op.move_uv import MUV_OT_MoveUV
+from .op.unwrap_constraint import MUV_OT_UnwrapConstraint
+from .op.pack_uv import MUV_OT_PackUV
+from .op.smooth_uv import MUV_OT_SmoothUV
+from .ui.VIEW3D_MT_uv_map import (
+    MUV_MT_CopyPasteUV,
+    MUV_MT_TransferUV,
+    MUV_MT_WorldScaleUV,
+    MUV_MT_PreserveUVAspect,
+    MUV_MT_TextureLock,
+    MUV_MT_TextureWrap,
+    MUV_MT_TextureProjection,
+    MUV_MT_UVW,
+)
+from .ui.VIEW3D_MT_object import MUV_MT_CopyPasteUV_Object
+from .ui.IMAGE_MT_uvs import (
+    MUV_MT_CopyPasteUV_UVEdit,
+    MUV_MT_SelectUV,
+    MUV_MT_AlignUV,
+    MUV_MT_AlignUVCursor,
+    MUV_MT_UVInspection,
+)
+from .utils.bl_class_registry import BlClassRegistry
+from .utils.addon_updator import AddonUpdatorManager
+from .utils import compatibility as compat
+from . import updater
+
+
+def view3d_uvmap_menu_fn(self, context):
+    layout = self.layout
+    sc = context.scene
+
+    layout.separator()
+    layout.label(text="Copy/Paste UV", icon=compat.icon('IMAGE'))
+    # Copy/Paste UV
+    layout.menu(MUV_MT_CopyPasteUV.bl_idname, text="Copy/Paste UV")
+    # Transfer UV
+    layout.menu(MUV_MT_TransferUV.bl_idname, text="Transfer UV")
+
+    layout.separator()
+    layout.label(text="UV Manipulation", icon=compat.icon('IMAGE'))
+    # Flip/Rotate UV
+    ops = layout.operator(MUV_OT_FlipRotate.bl_idname, text="Flip/Rotate UV")
+    ops.seams = sc.muv_flip_rotate_uv_seams
+    # Mirror UV
+    ops = layout.operator(MUV_OT_MirrorUV.bl_idname, text="Mirror UV")
+    ops.axis = sc.muv_mirror_uv_axis
+    # Move UV
+    layout.operator(MUV_OT_MoveUV.bl_idname, text="Move UV")
+    # World Scale UV
+    layout.menu(MUV_MT_WorldScaleUV.bl_idname, text="World Scale UV")
+    # Preserve UV
+    layout.menu(MUV_MT_PreserveUVAspect.bl_idname, text="Preserve UV")
+    # Texture Lock
+    layout.menu(MUV_MT_TextureLock.bl_idname, text="Texture Lock")
+    # Texture Wrap
+    layout.menu(MUV_MT_TextureWrap.bl_idname, text="Texture Wrap")
+    # UV Sculpt
+    layout.prop(sc, "muv_uv_sculpt_enable", text="UV Sculpt")
+
+    layout.separator()
+    layout.label(text="UV Mapping", icon=compat.icon('IMAGE'))
+    # Unwrap Constraint
+    ops = layout.operator(MUV_OT_UnwrapConstraint.bl_idname,
+                          text="Unwrap Constraint")
+    ops.u_const = sc.muv_unwrap_constraint_u_const
+    ops.v_const = sc.muv_unwrap_constraint_v_const
+    # Texture Projection
+    layout.menu(MUV_MT_TextureProjection.bl_idname, text="Texture Projection")
+    # UVW
+    layout.menu(MUV_MT_UVW.bl_idname, text="UVW")
+
+
+def view3d_object_menu_fn(self, _):
+    layout = self.layout
+
+    layout.separator()
+    layout.label(text="Copy/Paste UV", icon=compat.icon('IMAGE'))
+    # Copy/Paste UV (Among Object)
+    layout.menu(MUV_MT_CopyPasteUV_Object.bl_idname, text="Copy/Paste UV")
+
+
+def image_uvs_menu_fn(self, context):
+    layout = self.layout
+    sc = context.scene
+
+    layout.separator()
+    # Copy/Paste UV (on UV/Image Editor)
+    layout.label(text="Copy/Paste UV", icon=compat.icon('IMAGE'))
+    layout.menu(MUV_MT_CopyPasteUV_UVEdit.bl_idname, text="Copy/Paste UV")
+
+    layout.separator()
+    # Pack UV
+    layout.label(text="UV Manipulation", icon=compat.icon('IMAGE'))
+    ops = layout.operator(MUV_OT_PackUV.bl_idname, text="Pack UV")
+    ops.allowable_center_deviation = sc.muv_pack_uv_allowable_center_deviation
+    ops.allowable_size_deviation = sc.muv_pack_uv_allowable_size_deviation
+    # Select UV
+    layout.menu(MUV_MT_SelectUV.bl_idname, text="Select UV")
+    # Smooth UV
+    ops = layout.operator(MUV_OT_SmoothUV.bl_idname, text="Smooth")
+    ops.transmission = sc.muv_smooth_uv_transmission
+    ops.select = sc.muv_smooth_uv_select
+    ops.mesh_infl = sc.muv_smooth_uv_mesh_infl
+    # Align UV
+    layout.menu(MUV_MT_AlignUV.bl_idname, text="Align UV")
+
+    layout.separator()
+    # Align UV Cursor
+    layout.label(text="Editor Enhancement", icon=compat.icon('IMAGE'))
+    layout.menu(MUV_MT_AlignUVCursor.bl_idname, text="Align UV Cursor")
+    # UV Bounding Box
+    layout.prop(sc, "muv_uv_bounding_box_show", text="UV Bounding Box")
+    # UV Inspection
+    layout.menu(MUV_MT_UVInspection.bl_idname, text="UV Inspection")
+
+
+def add_builtin_menu():
+    bpy.types.VIEW3D_MT_uv_map.append(view3d_uvmap_menu_fn)
+    bpy.types.VIEW3D_MT_object.append(view3d_object_menu_fn)
+    bpy.types.IMAGE_MT_uvs.append(image_uvs_menu_fn)
+
+
+def remove_builtin_menu():
+    bpy.types.IMAGE_MT_uvs.remove(image_uvs_menu_fn)
+    bpy.types.VIEW3D_MT_object.append(view3d_object_menu_fn)
+    bpy.types.VIEW3D_MT_uv_map.remove(view3d_uvmap_menu_fn)
+
+
+def get_update_candidate_branches(_, __):
+    manager = AddonUpdatorManager.get_instance()
+    if not manager.candidate_checked():
+        return []
+
+    return [(name, name, "") for name in manager.get_candidate_branch_names()]
+
+
+def set_debug_mode(self, value):
+    self['enable_debug_mode'] = value
+
+
+def get_debug_mode(self):
+    enabled = self.get('enable_debug_mode', False)
+    if enabled:
+        common.enable_debugg_mode()
+    else:
+        common.disable_debug_mode()
+    return enabled
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class Preferences(AddonPreferences):
+    """Preferences class: Preferences for this add-on"""
+
+    bl_idname = "magic_uv"
+
+    def update_enable_builtin_menu(self, _):
+        if self['enable_builtin_menu']:
+            add_builtin_menu()
+        else:
+            remove_builtin_menu()
+
+    # enable to add features to built-in menu
+    enable_builtin_menu = BoolProperty(
+        name="Built-in Menu",
+        description="Enable built-in menu",
+        default=True,
+        update=update_enable_builtin_menu,
+    )
+
+    # enable debug mode
+    enable_debug_mode = BoolProperty(
+        name="Debug Mode",
+        description="Enable debugging mode",
+        default=False,
+        set=set_debug_mode,
+        get=get_debug_mode,
+    )
+
+    # for UV Sculpt
+    uv_sculpt_brush_color = FloatVectorProperty(
+        name="Color",
+        description="Color",
+        default=(1.0, 0.4, 0.4, 1.0),
+        min=0.0,
+        max=1.0,
+        size=4,
+        subtype='COLOR'
+    )
+
+    # for Overlapped UV
+    uv_inspection_overlapped_color = FloatVectorProperty(
+        name="Color",
+        description="Color",
+        default=(0.0, 0.0, 1.0, 0.3),
+        min=0.0,
+        max=1.0,
+        size=4,
+        subtype='COLOR'
+    )
+
+    # for Flipped UV
+    uv_inspection_flipped_color = FloatVectorProperty(
+        name="Color",
+        description="Color",
+        default=(1.0, 0.0, 0.0, 0.3),
+        min=0.0,
+        max=1.0,
+        size=4,
+        subtype='COLOR'
+    )
+
+    # for Texture Projection
+    texture_projection_canvas_padding = FloatVectorProperty(
+        name="Canvas Padding",
+        description="Canvas Padding",
+        size=2,
+        max=50.0,
+        min=0.0,
+        default=(20.0, 20.0))
+
+    # for UV Bounding Box
+    uv_bounding_box_cp_size = FloatProperty(
+        name="Size",
+        description="Control Point Size",
+        default=6.0,
+        min=3.0,
+        max=100.0)
+    uv_bounding_box_cp_react_size = FloatProperty(
+        name="React Size",
+        description="Size event fired",
+        default=10.0,
+        min=3.0,
+        max=100.0)
+
+    # for UI
+    category = EnumProperty(
+        name="Category",
+        description="Preferences Category",
+        items=[
+            ('INFO', "Information", "Information about this add-on"),
+            ('CONFIG', "Configuration", "Configuration about this add-on"),
+            ('UPDATE', "Update", "Update this add-on"),
+        ],
+        default='INFO'
+    )
+    info_desc_expanded = BoolProperty(
+        name="Description",
+        description="Description",
+        default=False
+    )
+    info_loc_expanded = BoolProperty(
+        name="Location",
+        description="Location",
+        default=False
+    )
+    conf_uv_sculpt_expanded = BoolProperty(
+        name="UV Sculpt",
+        description="UV Sculpt",
+        default=False
+    )
+    conf_uv_inspection_expanded = BoolProperty(
+        name="UV Inspection",
+        description="UV Inspection",
+        default=False
+    )
+    conf_texture_projection_expanded = BoolProperty(
+        name="Texture Projection",
+        description="Texture Projection",
+        default=False
+    )
+    conf_uv_bounding_box_expanded = BoolProperty(
+        name="UV Bounding Box",
+        description="UV Bounding Box",
+        default=False
+    )
+
+    # for add-on updater
+    updater_branch_to_update = EnumProperty(
+        name="branch",
+        description="Target branch to update add-on",
+        items=get_update_candidate_branches
+    )
+
+    def draw(self, _):
+        layout = self.layout
+
+        layout.row().prop(self, "category", expand=True)
+
+        if self.category == 'INFO':
+            layout.separator()
+
+            layout.prop(
+                self, "info_desc_expanded", text="Description",
+                icon='DISCLOSURE_TRI_DOWN' if self.info_desc_expanded
+                else 'DISCLOSURE_TRI_RIGHT')
+            if self.info_desc_expanded:
+                col = layout.column(align=True)
+                col.label(text="Magic UV is composed of many UV editing" +
+                          " features.")
+                col.label(text="See tutorial page if you are new to this" +
+                          " add-on.")
+                col.label(text="https://github.com/nutti/Magic-UV" +
+                          "/wiki/Tutorial")
+
+            layout.prop(
+                self, "info_loc_expanded", text="Location",
+                icon='DISCLOSURE_TRI_DOWN' if self.info_loc_expanded
+                else 'DISCLOSURE_TRI_RIGHT')
+            if self.info_loc_expanded:
+                row = layout.row(align=True)
+                sp = compat.layout_split(row, 0.5)
+                sp.label(text="3D View > Sidebar > " +
+                         "Copy/Paste UV (Object mode)")
+                sp = compat.layout_split(sp, 1.0)
+                col = sp.column(align=True)
+                col.label(text="Copy/Paste UV (Among objects)")
+
+                row = layout.row(align=True)
+                sp = compat.layout_split(row, 0.5)
+                sp.label(text="3D View > Sidebar > " +
+                         "Copy/Paste UV (Edit mode)")
+                sp = compat.layout_split(sp, 1.0)
+                col = sp.column(align=True)
+                col.label(text="Copy/Paste UV (Among faces in 3D View)")
+                col.label(text="Transfer UV")
+
+                row = layout.row(align=True)
+                sp = compat.layout_split(row, 0.5)
+                sp.label(text="3D View > Sidebar > " +
+                         "UV Manipulation (Edit mode)")
+                sp = compat.layout_split(sp, 1.0)
+                col = sp.column(align=True)
+                col.label(text="Flip/Rotate UV")
+                col.label(text="Mirror UV")
+                col.label(text="Move UV")
+                col.label(text="World Scale UV")
+                col.label(text="Preserve UV Aspect")
+                col.label(text="Texture Lock")
+                col.label(text="Texture Wrap")
+                col.label(text="UV Sculpt")
+
+                row = layout.row(align=True)
+                sp = compat.layout_split(row, 0.5)
+                sp.label(text="3D View > Sidebar > " +
+                         "UV Manipulation (Edit mode)")
+                sp = compat.layout_split(sp, 1.0)
+                col = sp.column(align=True)
+                col.label(text="Unwrap Constraint")
+                col.label(text="Texture Projection")
+                col.label(text="UVW")
+
+                row = layout.row(align=True)
+                sp = compat.layout_split(row, 0.5)
+                sp.label(text="UV/Image Editor > Sidebar > Copy/Paste UV")
+                sp = compat.layout_split(sp, 1.0)
+                col = sp.column(align=True)
+                col.label(text="Copy/Paste UV " +
+                          "(Among faces in UV/Image Editor)")
+
+                row = layout.row(align=True)
+                sp = compat.layout_split(row, 0.5)
+                sp.label(text="UV/Image Editor > Sidebar > UV Manipulation")
+                sp = compat.layout_split(sp, 1.0)
+                col = sp.column(align=True)
+                col.label(text="Align UV")
+                col.label(text="Smooth UV")
+                col.label(text="Select UV")
+                col.label(text="Pack UV (Extension)")
+
+                row = layout.row(align=True)
+                sp = compat.layout_split(row, 0.5)
+                sp.label(text="UV/Image Editor > Sidebar > " +
+                         "Editor Enhancement")
+                sp = compat.layout_split(sp, 1.0)
+                col = sp.column(align=True)
+                col.label(text="Align UV Cursor")
+                col.label(text="UV Cursor Location")
+                col.label(text="UV Bounding Box")
+                col.label(text="UV Inspection")
+
+        elif self.category == 'CONFIG':
+            layout.separator()
+
+            layout.prop(self, "enable_builtin_menu", text="Built-in Menu")
+            layout.prop(self, "enable_debug_mode", text="Debug Mode")
+
+            layout.separator()
+
+            layout.prop(
+                self, "conf_uv_sculpt_expanded", text="UV Sculpt",
+                icon='DISCLOSURE_TRI_DOWN' if self.conf_uv_sculpt_expanded
+                else 'DISCLOSURE_TRI_RIGHT')
+            if self.conf_uv_sculpt_expanded:
+                sp = compat.layout_split(layout, 0.05)
+                col = sp.column()  # spacer
+                sp = compat.layout_split(sp, 0.3)
+                col = sp.column()
+                col.label(text="Brush Color:")
+                col.prop(self, "uv_sculpt_brush_color", text="")
+                layout.separator()
+
+            layout.prop(
+                self, "conf_uv_inspection_expanded", text="UV Inspection",
+                icon='DISCLOSURE_TRI_DOWN' if self.conf_uv_inspection_expanded
+                else 'DISCLOSURE_TRI_RIGHT')
+            if self.conf_uv_inspection_expanded:
+                sp = compat.layout_split(layout, 0.05)
+                col = sp.column()  # spacer
+                sp = compat.layout_split(sp, 0.3)
+                col = sp.column()
+                col.label(text="Overlapped UV Color:")
+                col.prop(self, "uv_inspection_overlapped_color", text="")
+                sp = compat.layout_split(sp, 0.45)
+                col = sp.column()
+                col.label(text="Flipped UV Color:")
+                col.prop(self, "uv_inspection_flipped_color", text="")
+                layout.separator()
+
+            layout.prop(
+                self, "conf_texture_projection_expanded",
+                text="Texture Projection",
+                icon='DISCLOSURE_TRI_DOWN'
+                if self.conf_texture_projection_expanded
+                else 'DISCLOSURE_TRI_RIGHT')
+            if self.conf_texture_projection_expanded:
+                sp = compat.layout_split(layout, 0.05)
+                col = sp.column()       # spacer
+                sp = compat.layout_split(sp, 0.3)
+                col = sp.column()
+                col.prop(self, "texture_projection_canvas_padding")
+                layout.separator()
+
+            layout.prop(
+                self, "conf_uv_bounding_box_expanded", text="UV Bounding Box",
+                icon='DISCLOSURE_TRI_DOWN'
+                if self.conf_uv_bounding_box_expanded
+                else 'DISCLOSURE_TRI_RIGHT')
+            if self.conf_uv_bounding_box_expanded:
+                sp = compat.layout_split(layout, 0.05)
+                col = sp.column()       # spacer
+                sp = compat.layout_split(sp, 0.3)
+                col = sp.column()
+                col.label(text="Control Point:")
+                col.prop(self, "uv_bounding_box_cp_size")
+                col.prop(self, "uv_bounding_box_cp_react_size")
+                layout.separator()
+
+        elif self.category == 'UPDATE':
+            updater.draw_updater_ui(self)
diff --git a/magic_uv/properites.py b/magic_uv/properites.py
new file mode 100644
index 00000000..6ee00edd
--- /dev/null
+++ b/magic_uv/properites.py
@@ -0,0 +1,43 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+
+from .utils.property_class_registry import PropertyClassRegistry
+
+
+# Properties used in this add-on.
+# pylint: disable=W0612
+class MUV_Properties():
+    pass
+
+
+def init_props(scene):
+    scene.muv_props = MUV_Properties()
+    PropertyClassRegistry.init_props(scene)
+
+
+def clear_props(scene):
+    PropertyClassRegistry.del_props(scene)
+    del scene.muv_props
diff --git a/magic_uv/ui/IMAGE_MT_uvs.py b/magic_uv/ui/IMAGE_MT_uvs.py
new file mode 100644
index 00000000..ab7e33f8
--- /dev/null
+++ b/magic_uv/ui/IMAGE_MT_uvs.py
@@ -0,0 +1,188 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+
+from ..op.copy_paste_uv_uvedit import (
+    MUV_OT_CopyPasteUVUVEdit_CopyUV,
+    MUV_OT_CopyPasteUVUVEdit_PasteUV,
+)
+from ..op.align_uv_cursor import MUV_OT_AlignUVCursor
+from ..op.align_uv import (
+    MUV_OT_AlignUV_Circle,
+    MUV_OT_AlignUV_Straighten,
+    MUV_OT_AlignUV_Axis,
+)
+from ..op.select_uv import (
+    MUV_OT_SelectUV_SelectOverlapped,
+    MUV_OT_SelectUV_SelectFlipped,
+)
+from ..op.uv_inspection import MUV_OT_UVInspection_Update
+from ..utils.bl_class_registry import BlClassRegistry
+
+
+@BlClassRegistry()
+class MUV_MT_CopyPasteUV_UVEdit(bpy.types.Menu):
+    """
+    Menu class: Master menu of Copy/Paste UV coordinate on UV/ImageEditor
+    """
+
+    bl_idname = "uv.muv_mt_copy_paste_uv_uvedit"
+    bl_label = "Copy/Paste UV"
+    bl_description = "Copy and Paste UV coordinate among object"
+
+    def draw(self, _):
+        layout = self.layout
+
+        layout.operator(MUV_OT_CopyPasteUVUVEdit_CopyUV.bl_idname, text="Copy")
+        layout.operator(MUV_OT_CopyPasteUVUVEdit_PasteUV.bl_idname,
+                        text="Paste")
+
+
+@BlClassRegistry()
+class MUV_MT_AlignUV(bpy.types.Menu):
+    """
+    Menu class: Master menu of Align UV
+    """
+
+    bl_idname = "uv.muv_mt_align_uv"
+    bl_label = "Align UV"
+    bl_description = "Align UV"
+
+    def draw(self, context):
+        layout = self.layout
+        sc = context.scene
+
+        ops = layout.operator(MUV_OT_AlignUV_Circle.bl_idname, text="Circle")
+        ops.transmission = sc.muv_align_uv_transmission
+        ops.select = sc.muv_align_uv_select
+
+        ops = layout.operator(MUV_OT_AlignUV_Straighten.bl_idname,
+                              text="Straighten")
+        ops.transmission = sc.muv_align_uv_transmission
+        ops.select = sc.muv_align_uv_select
+        ops.vertical = sc.muv_align_uv_vertical
+        ops.horizontal = sc.muv_align_uv_horizontal
+
+        ops = layout.operator(MUV_OT_AlignUV_Axis.bl_idname, text="XY-axis")
+        ops.transmission = sc.muv_align_uv_transmission
+        ops.select = sc.muv_align_uv_select
+        ops.vertical = sc.muv_align_uv_vertical
+        ops.horizontal = sc.muv_align_uv_horizontal
+        ops.location = sc.muv_align_uv_location
+
+
+@BlClassRegistry()
+class MUV_MT_SelectUV(bpy.types.Menu):
+    """
+    Menu class: Master menu of Select UV
+    """
+
+    bl_idname = "uv.muv_mt_select_uv"
+    bl_label = "Select UV"
+    bl_description = "Select UV"
+
+    def draw(self, _):
+        layout = self.layout
+
+        layout.operator(MUV_OT_SelectUV_SelectOverlapped.bl_idname,
+                        text="Overlapped")
+        layout.operator(MUV_OT_SelectUV_SelectFlipped.bl_idname,
+                        text="Flipped")
+
+
+@BlClassRegistry()
+class MUV_MT_AlignUVCursor(bpy.types.Menu):
+    """
+    Menu class: Master menu of Align UV Cursor
+    """
+
+    bl_idname = "uv.muv_mt_align_uv_cursor"
+    bl_label = "Align UV Cursor"
+    bl_description = "Align UV cursor"
+
+    def draw(self, context):
+        layout = self.layout
+        sc = context.scene
+
+        ops = layout.operator(MUV_OT_AlignUVCursor.bl_idname, text="Left Top")
+        ops.position = 'LEFT_TOP'
+        ops.base = sc.muv_align_uv_cursor_align_method
+
+        ops = layout.operator(MUV_OT_AlignUVCursor.bl_idname,
+                              text="Middle Top")
+        ops.position = 'MIDDLE_TOP'
+        ops.base = sc.muv_align_uv_cursor_align_method
+
+        ops = layout.operator(MUV_OT_AlignUVCursor.bl_idname, text="Right Top")
+        ops.position = 'RIGHT_TOP'
+        ops.base = sc.muv_align_uv_cursor_align_method
+
+        ops = layout.operator(MUV_OT_AlignUVCursor.bl_idname,
+                              text="Left Middle")
+        ops.position = 'LEFT_MIDDLE'
+        ops.base = sc.muv_align_uv_cursor_align_method
+
+        ops = layout.operator(MUV_OT_AlignUVCursor.bl_idname, text="Center")
+        ops.position = 'CENTER'
+        ops.base = sc.muv_align_uv_cursor_align_method
+
+        ops = layout.operator(MUV_OT_AlignUVCursor.bl_idname,
+                              text="Right Middle")
+        ops.position = 'RIGHT_MIDDLE'
+        ops.base = sc.muv_align_uv_cursor_align_method
+
+        ops = layout.operator(MUV_OT_AlignUVCursor.bl_idname,
+                              text="Left Bottom")
+        ops.position = 'LEFT_BOTTOM'
+        ops.base = sc.muv_align_uv_cursor_align_method
+
+        ops = layout.operator(MUV_OT_AlignUVCursor.bl_idname,
+                              text="Middle Bottom")
+        ops.position = 'MIDDLE_BOTTOM'
+        ops.base = sc.muv_align_uv_cursor_align_method
+
+        ops = layout.operator(MUV_OT_AlignUVCursor.bl_idname,
+                              text="Right Bottom")
+        ops.position = 'RIGHT_BOTTOM'
+        ops.base = sc.muv_align_uv_cursor_align_method
+
+
+@BlClassRegistry()
+class MUV_MT_UVInspection(bpy.types.Menu):
+    """
+    Menu class: Master menu of UV Inspection
+    """
+
+    bl_idname = "uv.muv_mt_uv_inspection"
+    bl_label = "UV Inspection"
+    bl_description = "UV Inspection"
+
+    def draw(self, context):
+        layout = self.layout
+        sc = context.scene
+
+        layout.prop(sc, "muv_uv_inspection_show", text="UV Inspection")
+        layout.operator(MUV_OT_UVInspection_Update.bl_idname, text="Update")
diff --git a/magic_uv/ui/VIEW3D_MT_object.py b/magic_uv/ui/VIEW3D_MT_object.py
new file mode 100644
index 00000000..b691bdd5
--- /dev/null
+++ b/magic_uv/ui/VIEW3D_MT_object.py
@@ -0,0 +1,49 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+
+from ..op.copy_paste_uv_object import (
+    MUV_MT_CopyPasteUVObject_CopyUV,
+    MUV_MT_CopyPasteUVObject_PasteUV,
+)
+from ..utils.bl_class_registry import BlClassRegistry
+
+
+@BlClassRegistry()
+class MUV_MT_CopyPasteUV_Object(bpy.types.Menu):
+    """
+    Menu class: Master menu of Copy/Paste UV coordinate among object
+    """
+
+    bl_idname = "uv.muv_mt_copy_paste_uv_object"
+    bl_label = "Copy/Paste UV"
+    bl_description = "Copy and Paste UV coordinate among object"
+
+    def draw(self, _):
+        layout = self.layout
+
+        layout.menu(MUV_MT_CopyPasteUVObject_CopyUV.bl_idname, text="Copy")
+        layout.menu(MUV_MT_CopyPasteUVObject_PasteUV.bl_idname, text="Paste")
diff --git a/magic_uv/ui/VIEW3D_MT_uv_map.py b/magic_uv/ui/VIEW3D_MT_uv_map.py
new file mode 100644
index 00000000..12202602
--- /dev/null
+++ b/magic_uv/ui/VIEW3D_MT_uv_map.py
@@ -0,0 +1,254 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy.utils
+
+from ..op.copy_paste_uv import (
+    MUV_MT_CopyPasteUV_CopyUV,
+    MUV_MT_CopyPasteUV_PasteUV,
+    MUV_MT_CopyPasteUV_SelSeqCopyUV,
+    MUV_MT_CopyPasteUV_SelSeqPasteUV,
+)
+from ..op.transfer_uv import (
+    MUV_OT_TransferUV_CopyUV,
+    MUV_OT_TransferUV_PasteUV,
+)
+from ..op.uvw import (
+    MUV_OT_UVW_BoxMap,
+    MUV_OT_UVW_BestPlanerMap,
+)
+from ..op.preserve_uv_aspect import MUV_OT_PreserveUVAspect
+from ..op.texture_lock import (
+    MUV_OT_TextureLock_Lock,
+    MUV_OT_TextureLock_Unlock,
+)
+from ..op.texture_wrap import (
+    MUV_OT_TextureWrap_Refer,
+    MUV_OT_TextureWrap_Set,
+)
+from ..op.world_scale_uv import (
+    MUV_OT_WorldScaleUV_Measure,
+    MUV_OT_WorldScaleUV_ApplyManual,
+    MUV_OT_WorldScaleUV_ApplyScalingDensity,
+    MUV_OT_WorldScaleUV_ApplyProportionalToMesh,
+)
+from ..op.texture_projection import MUV_OT_TextureProjection_Project
+from ..utils.bl_class_registry import BlClassRegistry
+
+
+@BlClassRegistry()
+class MUV_MT_CopyPasteUV(bpy.types.Menu):
+    """
+    Menu class: Master menu of Copy/Paste UV coordinate
+    """
+
+    bl_idname = "uv.muv_mt_copy_paste_uv"
+    bl_label = "Copy/Paste UV"
+    bl_description = "Copy and Paste UV coordinate"
+
+    def draw(self, _):
+        layout = self.layout
+
+        layout.label(text="Default")
+        layout.menu(MUV_MT_CopyPasteUV_CopyUV.bl_idname, text="Copy")
+        layout.menu(MUV_MT_CopyPasteUV_PasteUV.bl_idname, text="Paste")
+
+        layout.separator()
+
+        layout.label(text="Selection Sequence")
+        layout.menu(MUV_MT_CopyPasteUV_SelSeqCopyUV.bl_idname, text="Copy")
+        layout.menu(MUV_MT_CopyPasteUV_SelSeqPasteUV.bl_idname, text="Paste")
+
+
+@BlClassRegistry()
+class MUV_MT_TransferUV(bpy.types.Menu):
+    """
+    Menu class: Master menu of Transfer UV coordinate
+    """
+
+    bl_idname = "uv.muv_mt_transfer_uv"
+    bl_label = "Transfer UV"
+    bl_description = "Transfer UV coordinate"
+
+    def draw(self, context):
+        layout = self.layout
+        sc = context.scene
+
+        layout.operator(MUV_OT_TransferUV_CopyUV.bl_idname, text="Copy")
+        ops = layout.operator(MUV_OT_TransferUV_PasteUV.bl_idname,
+                              text="Paste")
+        ops.invert_normals = sc.muv_transfer_uv_invert_normals
+        ops.copy_seams = sc.muv_transfer_uv_copy_seams
+
+
+@BlClassRegistry()
+class MUV_MT_TextureLock(bpy.types.Menu):
+    """
+    Menu class: Master menu of Texture Lock
+    """
+
+    bl_idname = "uv.muv_mt_texture_lock"
+    bl_label = "Texture Lock"
+    bl_description = "Lock texture when vertices of mesh (Preserve UV)"
+
+    def draw(self, context):
+        layout = self.layout
+        sc = context.scene
+
+        layout.label(text="Normal Mode")
+        layout.operator(
+            MUV_OT_TextureLock_Lock.bl_idname,
+            text="Lock"
+            if not MUV_OT_TextureLock_Lock.is_ready(context)
+            else "ReLock")
+        ops = layout.operator(MUV_OT_TextureLock_Unlock.bl_idname,
+                              text="Unlock")
+        ops.connect = sc.muv_texture_lock_connect
+
+        layout.separator()
+
+        layout.label(text="Interactive Mode")
+        layout.prop(sc, "muv_texture_lock_lock", text="Lock")
+
+
+@BlClassRegistry()
+class MUV_MT_WorldScaleUV(bpy.types.Menu):
+    """
+    Menu class: Master menu of world scale UV
+    """
+
+    bl_idname = "uv.muv_mt_world_scale_uv"
+    bl_label = "World Scale UV"
+    bl_description = ""
+
+    def draw(self, context):
+        layout = self.layout
+        sc = context.scene
+
+        layout.operator(MUV_OT_WorldScaleUV_Measure.bl_idname,
+                        text="Measure")
+
+        layout.operator(MUV_OT_WorldScaleUV_ApplyManual.bl_idname,
+                        text="Apply (Manual)")
+
+        ops = layout.operator(
+            MUV_OT_WorldScaleUV_ApplyScalingDensity.bl_idname,
+            text="Apply (Same Desity)")
+        ops.src_density = sc.muv_world_scale_uv_src_density
+        ops.same_density = True
+
+        ops = layout.operator(
+            MUV_OT_WorldScaleUV_ApplyScalingDensity.bl_idname,
+            text="Apply (Scaling Desity)")
+        ops.src_density = sc.muv_world_scale_uv_src_density
+        ops.same_density = False
+        ops.tgt_scaling_factor = sc.muv_world_scale_uv_tgt_scaling_factor
+
+        ops = layout.operator(
+            MUV_OT_WorldScaleUV_ApplyProportionalToMesh.bl_idname,
+            text="Apply (Proportional to Mesh)")
+        ops.src_density = sc.muv_world_scale_uv_src_density
+        ops.src_uv_area = sc.muv_world_scale_uv_src_uv_area
+        ops.src_mesh_area = sc.muv_world_scale_uv_src_mesh_area
+        ops.origin = sc.muv_world_scale_uv_origin
+
+
+@BlClassRegistry()
+class MUV_MT_TextureWrap(bpy.types.Menu):
+    """
+    Menu class: Master menu of Texture Wrap
+    """
+
+    bl_idname = "uv.muv_mt_texture_wrap"
+    bl_label = "Texture Wrap"
+    bl_description = ""
+
+    def draw(self, _):
+        layout = self.layout
+
+        layout.operator(MUV_OT_TextureWrap_Refer.bl_idname, text="Refer")
+        layout.operator(MUV_OT_TextureWrap_Set.bl_idname, text="Set")
+
+
+@BlClassRegistry()
+class MUV_MT_UVW(bpy.types.Menu):
+    """
+    Menu class: Master menu of UVW
+    """
+
+    bl_idname = "uv.muv_mt_uvw"
+    bl_label = "UVW"
+    bl_description = ""
+
+    def draw(self, context):
+        layout = self.layout
+        sc = context.scene
+
+        ops = layout.operator(MUV_OT_UVW_BoxMap.bl_idname, text="Box")
+        ops.assign_uvmap = sc.muv_uvw_assign_uvmap
+
+        ops = layout.operator(MUV_OT_UVW_BestPlanerMap.bl_idname,
+                              text="Best Planner")
+        ops.assign_uvmap = sc.muv_uvw_assign_uvmap
+
+
+@BlClassRegistry()
+class MUV_MT_PreserveUVAspect(bpy.types.Menu):
+    """
+    Menu class: Master menu of Preserve UV Aspect
+    """
+
+    bl_idname = "uv.muv_mt_preserve_uv_aspect"
+    bl_label = "Preserve UV Aspect"
+    bl_description = ""
+
+    def draw(self, context):
+        layout = self.layout
+        sc = context.scene
+
+        for key in bpy.data.images.keys():
+            ops = layout.operator(MUV_OT_PreserveUVAspect.bl_idname, text=key)
+            ops.dest_img_name = key
+            ops.origin = sc.muv_preserve_uv_aspect_origin
+
+
+@BlClassRegistry()
+class MUV_MT_TextureProjection(bpy.types.Menu):
+    """
+    Menu class: Master menu of Texture Projection
+    """
+
+    bl_idname = "uv.muv_mt_texture_projection"
+    bl_label = "Texture Projection"
+    bl_description = ""
+
+    def draw(self, context):
+        layout = self.layout
+        sc = context.scene
+
+        layout.prop(sc, "muv_texture_projection_enable",
+                    text="Texture Projection")
+        layout.operator(MUV_OT_TextureProjection_Project.bl_idname,
+                        text="Project")
diff --git a/magic_uv/ui/__init__.py b/magic_uv/ui/__init__.py
new file mode 100644
index 00000000..032cc3bd
--- /dev/null
+++ b/magic_uv/ui/__init__.py
@@ -0,0 +1,50 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+if "bpy" in locals():
+    import importlib
+    importlib.reload(view3d_copy_paste_uv_editmode)
+    importlib.reload(view3d_copy_paste_uv_objectmode)
+    importlib.reload(view3d_uv_manipulation)
+    importlib.reload(view3d_uv_mapping)
+    importlib.reload(uvedit_copy_paste_uv)
+    importlib.reload(uvedit_uv_manipulation)
+    importlib.reload(uvedit_editor_enhancement)
+    importlib.reload(VIEW3D_MT_object)
+    importlib.reload(VIEW3D_MT_uv_map)
+    importlib.reload(IMAGE_MT_uvs)
+else:
+    from . import view3d_copy_paste_uv_editmode
+    from . import view3d_copy_paste_uv_objectmode
+    from . import view3d_uv_manipulation
+    from . import view3d_uv_mapping
+    from . import uvedit_copy_paste_uv
+    from . import uvedit_uv_manipulation
+    from . import uvedit_editor_enhancement
+    from . import VIEW3D_MT_object
+    from . import VIEW3D_MT_uv_map
+    from . import IMAGE_MT_uvs
+
+import bpy
diff --git a/magic_uv/ui/uvedit_copy_paste_uv.py b/magic_uv/ui/uvedit_copy_paste_uv.py
new file mode 100644
index 00000000..39259649
--- /dev/null
+++ b/magic_uv/ui/uvedit_copy_paste_uv.py
@@ -0,0 +1,59 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+
+from ..op.copy_paste_uv_uvedit import (
+    MUV_OT_CopyPasteUVUVEdit_CopyUV,
+    MUV_OT_CopyPasteUVUVEdit_PasteUV,
+)
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils import compatibility as compat
+
+
+@BlClassRegistry()
+@compat.ChangeRegionType(region_type='TOOLS')
+class MUV_PT_UVEdit_CopyPasteUV(bpy.types.Panel):
+    """
+    Panel class: Copy/Paste UV on Property Panel on UV/ImageEditor
+    """
+
+    bl_space_type = 'IMAGE_EDITOR'
+    bl_region_type = 'UI'
+    bl_label = "Copy/Paste UV"
+    bl_category = "Magic UV"
+    bl_context = 'mesh_edit'
+    bl_options = {'DEFAULT_CLOSED'}
+
+    def draw_header(self, _):
+        layout = self.layout
+        layout.label(text="", icon=compat.icon('IMAGE'))
+
+    def draw(self, _):
+        layout = self.layout
+
+        row = layout.row(align=True)
+        row.operator(MUV_OT_CopyPasteUVUVEdit_CopyUV.bl_idname, text="Copy")
+        row.operator(MUV_OT_CopyPasteUVUVEdit_PasteUV.bl_idname, text="Paste")
diff --git a/magic_uv/ui/uvedit_editor_enhancement.py b/magic_uv/ui/uvedit_editor_enhancement.py
new file mode 100644
index 00000000..dbae514f
--- /dev/null
+++ b/magic_uv/ui/uvedit_editor_enhancement.py
@@ -0,0 +1,146 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+
+from ..op.align_uv_cursor import MUV_OT_AlignUVCursor
+from ..op.uv_bounding_box import (
+    MUV_OT_UVBoundingBox,
+)
+from ..op.uv_inspection import (
+    MUV_OT_UVInspection_Render,
+    MUV_OT_UVInspection_Update,
+)
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils import compatibility as compat
+
+
+@BlClassRegistry()
+@compat.ChangeRegionType(region_type='TOOLS')
+class MUV_PT_UVEdit_EditorEnhancement(bpy.types.Panel):
+    """
+    Panel class: UV/Image Editor Enhancement
+    """
+
+    bl_space_type = 'IMAGE_EDITOR'
+    bl_region_type = 'UI'
+    bl_label = "Editor Enhancement"
+    bl_category = "Magic UV"
+    bl_context = 'mesh_edit'
+    bl_options = {'DEFAULT_CLOSED'}
+
+    def draw_header(self, _):
+        layout = self.layout
+        layout.label(text="", icon=compat.icon('IMAGE'))
+
+    def draw(self, context):
+        layout = self.layout
+        sc = context.scene
+
+        box = layout.box()
+        box.prop(sc, "muv_align_uv_cursor_enabled", text="Align UV Cursor")
+        if sc.muv_align_uv_cursor_enabled:
+            box.prop(sc, "muv_align_uv_cursor_align_method", expand=True)
+
+            col = box.column(align=True)
+
+            row = col.row(align=True)
+            ops = row.operator(MUV_OT_AlignUVCursor.bl_idname, text="Left Top")
+            ops.position = 'LEFT_TOP'
+            ops.base = sc.muv_align_uv_cursor_align_method
+            ops = row.operator(MUV_OT_AlignUVCursor.bl_idname,
+                               text="Middle Top")
+            ops.position = 'MIDDLE_TOP'
+            ops.base = sc.muv_align_uv_cursor_align_method
+            ops = row.operator(MUV_OT_AlignUVCursor.bl_idname,
+                               text="Right Top")
+            ops.position = 'RIGHT_TOP'
+            ops.base = sc.muv_align_uv_cursor_align_method
+
+            row = col.row(align=True)
+            ops = row.operator(MUV_OT_AlignUVCursor.bl_idname,
+                               text="Left Middle")
+            ops.position = 'LEFT_MIDDLE'
+            ops.base = sc.muv_align_uv_cursor_align_method
+            ops = row.operator(MUV_OT_AlignUVCursor.bl_idname, text="Center")
+            ops.position = 'CENTER'
+            ops.base = sc.muv_align_uv_cursor_align_method
+            ops = row.operator(MUV_OT_AlignUVCursor.bl_idname,
+                               text="Right Middle")
+            ops.position = 'RIGHT_MIDDLE'
+            ops.base = sc.muv_align_uv_cursor_align_method
+
+            row = col.row(align=True)
+            ops = row.operator(MUV_OT_AlignUVCursor.bl_idname,
+                               text="Left Bottom")
+            ops.position = 'LEFT_BOTTOM'
+            ops.base = sc.muv_align_uv_cursor_align_method
+            ops = row.operator(MUV_OT_AlignUVCursor.bl_idname,
+                               text="Middle Bottom")
+            ops.position = 'MIDDLE_BOTTOM'
+            ops.base = sc.muv_align_uv_cursor_align_method
+            ops = row.operator(MUV_OT_AlignUVCursor.bl_idname,
+                               text="Right Bottom")
+            ops.position = 'RIGHT_BOTTOM'
+            ops.base = sc.muv_align_uv_cursor_align_method
+
+        box = layout.box()
+        box.prop(sc, "muv_uv_cursor_location_enabled",
+                 text="UV Cursor Location")
+        if sc.muv_uv_cursor_location_enabled:
+            box.prop(sc, "muv_align_uv_cursor_cursor_loc", text="")
+
+        box = layout.box()
+        box.prop(sc, "muv_uv_bounding_box_enabled", text="UV Bounding Box")
+        if sc.muv_uv_bounding_box_enabled:
+            box.prop(sc, "muv_uv_bounding_box_show",
+                     text="Hide"
+                     if MUV_OT_UVBoundingBox.is_running(context)
+                     else "Show",
+                     icon='RESTRICT_VIEW_OFF'
+                     if MUV_OT_UVBoundingBox.is_running(context)
+                     else 'RESTRICT_VIEW_ON')
+            box.prop(sc, "muv_uv_bounding_box_uniform_scaling",
+                     text="Uniform Scaling")
+            box.prop(sc, "muv_uv_bounding_box_boundary", text="Boundary")
+
+        box = layout.box()
+        box.prop(sc, "muv_uv_inspection_enabled", text="UV Inspection")
+        if sc.muv_uv_inspection_enabled:
+            row = box.row()
+            row.prop(
+                sc, "muv_uv_inspection_show",
+                text="Hide"
+                if MUV_OT_UVInspection_Render.is_running(context)
+                else "Show",
+                icon='RESTRICT_VIEW_OFF'
+                if MUV_OT_UVInspection_Render.is_running(context)
+                else 'RESTRICT_VIEW_ON')
+            row.operator(MUV_OT_UVInspection_Update.bl_idname, text="Update")
+            row = box.row()
+            row.prop(sc, "muv_uv_inspection_show_overlapped")
+            row.prop(sc, "muv_uv_inspection_show_flipped")
+            row = box.row()
+            row.prop(sc, "muv_uv_inspection_show_mode")
diff --git a/magic_uv/ui/uvedit_uv_manipulation.py b/magic_uv/ui/uvedit_uv_manipulation.py
new file mode 100644
index 00000000..96c8b54b
--- /dev/null
+++ b/magic_uv/ui/uvedit_uv_manipulation.py
@@ -0,0 +1,132 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+
+from ..op.align_uv import (
+    MUV_OT_AlignUV_Circle,
+    MUV_OT_AlignUV_Straighten,
+    MUV_OT_AlignUV_Axis,
+)
+from ..op.smooth_uv import (
+    MUV_OT_SmoothUV,
+)
+from ..op.select_uv import (
+    MUV_OT_SelectUV_SelectOverlapped,
+    MUV_OT_SelectUV_SelectFlipped,
+)
+from ..op.pack_uv import MUV_OT_PackUV
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils import compatibility as compat
+
+
+@BlClassRegistry()
+@compat.ChangeRegionType(region_type='TOOLS')
+class MUV_PT_UVEdit_UVManipulation(bpy.types.Panel):
+    """
+    Panel class: UV Manipulation on Property Panel on UV/ImageEditor
+    """
+
+    bl_space_type = 'IMAGE_EDITOR'
+    bl_region_type = 'UI'
+    bl_label = "UV Manipulation"
+    bl_category = "Magic UV"
+    bl_context = 'mesh_edit'
+    bl_options = {'DEFAULT_CLOSED'}
+
+    def draw_header(self, _):
+        layout = self.layout
+        layout.label(text="", icon=compat.icon('IMAGE'))
+
+    def draw(self, context):
+        sc = context.scene
+        layout = self.layout
+
+        box = layout.box()
+        box.prop(sc, "muv_align_uv_enabled", text="Align UV")
+        if sc.muv_align_uv_enabled:
+            col = box.column()
+            row = col.row(align=True)
+            ops = row.operator(MUV_OT_AlignUV_Circle.bl_idname, text="Circle")
+            ops.transmission = sc.muv_align_uv_transmission
+            ops.select = sc.muv_align_uv_select
+            ops = row.operator(MUV_OT_AlignUV_Straighten.bl_idname,
+                               text="Straighten")
+            ops.transmission = sc.muv_align_uv_transmission
+            ops.select = sc.muv_align_uv_select
+            ops.vertical = sc.muv_align_uv_vertical
+            ops.horizontal = sc.muv_align_uv_horizontal
+            ops.mesh_infl = sc.muv_align_uv_mesh_infl
+            row = col.row()
+            ops = row.operator(MUV_OT_AlignUV_Axis.bl_idname, text="XY-axis")
+            ops.transmission = sc.muv_align_uv_transmission
+            ops.select = sc.muv_align_uv_select
+            ops.vertical = sc.muv_align_uv_vertical
+            ops.horizontal = sc.muv_align_uv_horizontal
+            ops.location = sc.muv_align_uv_location
+            ops.mesh_infl = sc.muv_align_uv_mesh_infl
+            row.prop(sc, "muv_align_uv_location", text="")
+
+            col = box.column(align=True)
+            row = col.row(align=True)
+            row.prop(sc, "muv_align_uv_transmission", text="Transmission")
+            row.prop(sc, "muv_align_uv_select", text="Select")
+            row = col.row(align=True)
+            row.prop(sc, "muv_align_uv_vertical", text="Vertical")
+            row.prop(sc, "muv_align_uv_horizontal", text="Horizontal")
+            col.prop(sc, "muv_align_uv_mesh_infl", text="Mesh Influence")
+
+        box = layout.box()
+        box.prop(sc, "muv_smooth_uv_enabled", text="Smooth UV")
+        if sc.muv_smooth_uv_enabled:
+            ops = box.operator(MUV_OT_SmoothUV.bl_idname, text="Smooth")
+            ops.transmission = sc.muv_smooth_uv_transmission
+            ops.select = sc.muv_smooth_uv_select
+            ops.mesh_infl = sc.muv_smooth_uv_mesh_infl
+            col = box.column(align=True)
+            row = col.row(align=True)
+            row.prop(sc, "muv_smooth_uv_transmission", text="Transmission")
+            row.prop(sc, "muv_smooth_uv_select", text="Select")
+            col.prop(sc, "muv_smooth_uv_mesh_infl", text="Mesh Influence")
+
+        box = layout.box()
+        box.prop(sc, "muv_select_uv_enabled", text="Select UV")
+        if sc.muv_select_uv_enabled:
+            row = box.row(align=True)
+            row.operator(MUV_OT_SelectUV_SelectOverlapped.bl_idname)
+            row.operator(MUV_OT_SelectUV_SelectFlipped.bl_idname)
+
+        box = layout.box()
+        box.prop(sc, "muv_pack_uv_enabled", text="Pack UV (Extension)")
+        if sc.muv_pack_uv_enabled:
+            ops = box.operator(MUV_OT_PackUV.bl_idname, text="Pack UV")
+            ops.allowable_center_deviation = \
+                sc.muv_pack_uv_allowable_center_deviation
+            ops.allowable_size_deviation = \
+                sc.muv_pack_uv_allowable_size_deviation
+            box.label(text="Allowable Center Deviation:")
+            box.prop(sc, "muv_pack_uv_allowable_center_deviation", text="")
+            box.label(text="Allowable Size Deviation:")
+            box.prop(sc, "muv_pack_uv_allowable_size_deviation", text="")
diff --git a/magic_uv/ui/view3d_copy_paste_uv_editmode.py b/magic_uv/ui/view3d_copy_paste_uv_editmode.py
new file mode 100644
index 00000000..49a4e0a3
--- /dev/null
+++ b/magic_uv/ui/view3d_copy_paste_uv_editmode.py
@@ -0,0 +1,92 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+
+from ..op.copy_paste_uv import (
+    MUV_MT_CopyPasteUV_CopyUV,
+    MUV_MT_CopyPasteUV_PasteUV,
+    MUV_MT_CopyPasteUV_SelSeqCopyUV,
+    MUV_MT_CopyPasteUV_SelSeqPasteUV,
+)
+from ..op.transfer_uv import (
+    MUV_OT_TransferUV_CopyUV,
+    MUV_OT_TransferUV_PasteUV,
+)
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils import compatibility as compat
+
+
+@BlClassRegistry()
+@compat.ChangeRegionType(region_type='TOOLS')
+class MUV_PT_CopyPasteUVEditMode(bpy.types.Panel):
+    """
+    Panel class: Copy/Paste UV on Property Panel on View3D
+    """
+
+    bl_space_type = 'VIEW_3D'
+    bl_region_type = 'UI'
+    bl_label = "Copy/Paste UV"
+    bl_category = "Magic UV"
+    bl_context = 'mesh_edit'
+    bl_options = {'DEFAULT_CLOSED'}
+
+    def draw_header(self, _):
+        layout = self.layout
+        layout.label(text="", icon=compat.icon('IMAGE'))
+
+    def draw(self, context):
+        sc = context.scene
+        layout = self.layout
+
+        box = layout.box()
+        box.prop(sc, "muv_copy_paste_uv_enabled", text="Copy/Paste UV")
+        if sc.muv_copy_paste_uv_enabled:
+            row = box.row(align=True)
+            if sc.muv_copy_paste_uv_mode == 'DEFAULT':
+                row.menu(MUV_MT_CopyPasteUV_CopyUV.bl_idname, text="Copy")
+                row.menu(MUV_MT_CopyPasteUV_PasteUV.bl_idname, text="Paste")
+            elif sc.muv_copy_paste_uv_mode == 'SEL_SEQ':
+                row.menu(MUV_MT_CopyPasteUV_SelSeqCopyUV.bl_idname,
+                         text="Copy")
+                row.menu(MUV_MT_CopyPasteUV_SelSeqPasteUV.bl_idname,
+                         text="Paste")
+            box.prop(sc, "muv_copy_paste_uv_mode", expand=True)
+            box.prop(sc, "muv_copy_paste_uv_copy_seams", text="Seams")
+            box.prop(sc, "muv_copy_paste_uv_strategy", text="Strategy")
+
+        box = layout.box()
+        box.prop(sc, "muv_transfer_uv_enabled", text="Transfer UV")
+        if sc.muv_transfer_uv_enabled:
+            row = box.row(align=True)
+            row.operator(MUV_OT_TransferUV_CopyUV.bl_idname, text="Copy")
+            ops = row.operator(MUV_OT_TransferUV_PasteUV.bl_idname,
+                               text="Paste")
+            ops.invert_normals = sc.muv_transfer_uv_invert_normals
+            ops.copy_seams = sc.muv_transfer_uv_copy_seams
+            row = box.row()
+            row.prop(sc, "muv_transfer_uv_invert_normals",
+                     text="Invert Normals")
+            row.prop(sc, "muv_transfer_uv_copy_seams", text="Seams")
diff --git a/magic_uv/ui/view3d_copy_paste_uv_objectmode.py b/magic_uv/ui/view3d_copy_paste_uv_objectmode.py
new file mode 100644
index 00000000..574a0e43
--- /dev/null
+++ b/magic_uv/ui/view3d_copy_paste_uv_objectmode.py
@@ -0,0 +1,62 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+
+from ..op.copy_paste_uv_object import (
+    MUV_MT_CopyPasteUVObject_CopyUV,
+    MUV_MT_CopyPasteUVObject_PasteUV,
+)
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils import compatibility as compat
+
+
+@BlClassRegistry()
+@compat.ChangeRegionType(region_type='TOOLS')
+class MUV_PT_View3D_Object_CopyPasteUV(bpy.types.Panel):
+    """
+    Panel class: Copy/Paste UV on Property Panel on View3D
+    """
+
+    bl_space_type = 'VIEW_3D'
+    bl_region_type = 'UI'
+    bl_label = "Copy/Paste UV"
+    bl_category = "Magic UV"
+    bl_context = 'objectmode'
+    bl_options = {'DEFAULT_CLOSED'}
+
+    def draw_header(self, _):
+        layout = self.layout
+        layout.label(text="", icon=compat.icon('IMAGE'))
+
+    def draw(self, context):
+        sc = context.scene
+        layout = self.layout
+
+        row = layout.row(align=True)
+        row.menu(MUV_MT_CopyPasteUVObject_CopyUV.bl_idname, text="Copy")
+        row.menu(MUV_MT_CopyPasteUVObject_PasteUV.bl_idname, text="Paste")
+        layout.prop(sc, "muv_copy_paste_uv_object_copy_seams",
+                    text="Seams")
diff --git a/magic_uv/ui/view3d_uv_manipulation.py b/magic_uv/ui/view3d_uv_manipulation.py
new file mode 100644
index 00000000..312ae171
--- /dev/null
+++ b/magic_uv/ui/view3d_uv_manipulation.py
@@ -0,0 +1,282 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+
+from ..op.texture_lock import (
+    MUV_OT_TextureLock_Lock,
+    MUV_OT_TextureLock_Unlock,
+    MUV_OT_TextureLock_Intr,
+)
+from ..op.texture_wrap import (
+    MUV_OT_TextureWrap_Refer,
+    MUV_OT_TextureWrap_Set,
+)
+from ..op.uv_sculpt import (
+    MUV_OT_UVSculpt,
+)
+from ..op.world_scale_uv import (
+    MUV_OT_WorldScaleUV_Measure,
+    MUV_OT_WorldScaleUV_ApplyManual,
+    MUV_OT_WorldScaleUV_ApplyScalingDensity,
+    MUV_OT_WorldScaleUV_ApplyProportionalToMesh,
+)
+from ..op.flip_rotate_uv import MUV_OT_FlipRotate
+from ..op.mirror_uv import MUV_OT_MirrorUV
+from ..op.move_uv import MUV_OT_MoveUV
+from ..op.preserve_uv_aspect import MUV_OT_PreserveUVAspect
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils import compatibility as compat
+
+
+@BlClassRegistry()
+@compat.ChangeRegionType(region_type='TOOLS')
+class MUV_PT_View3D_UVManipulation(bpy.types.Panel):
+    """
+    Panel class: UV Manipulation on Property Panel on View3D
+    """
+
+    bl_space_type = 'VIEW_3D'
+    bl_region_type = 'UI'
+    bl_label = "UV Manipulation"
+    bl_category = "Magic UV"
+    bl_context = 'mesh_edit'
+    bl_options = {'DEFAULT_CLOSED'}
+
+    def draw_header(self, _):
+        layout = self.layout
+        layout.label(text="", icon=compat.icon('IMAGE'))
+
+    def draw(self, context):
+        sc = context.scene
+        layout = self.layout
+
+        box = layout.box()
+        box.prop(sc, "muv_flip_rotate_uv_enabled", text="Flip/Rotate UV")
+        if sc.muv_flip_rotate_uv_enabled:
+            row = box.row()
+            ops = row.operator(MUV_OT_FlipRotate.bl_idname, text="Flip/Rotate")
+            ops.seams = sc.muv_flip_rotate_uv_seams
+            row.prop(sc, "muv_flip_rotate_uv_seams", text="Seams")
+
+        box = layout.box()
+        box.prop(sc, "muv_mirror_uv_enabled", text="Mirror UV")
+        if sc.muv_mirror_uv_enabled:
+            row = box.row()
+            ops = row.operator(MUV_OT_MirrorUV.bl_idname, text="Mirror")
+            ops.axis = sc.muv_mirror_uv_axis
+            row.prop(sc, "muv_mirror_uv_axis", text="")
+
+        box = layout.box()
+        box.prop(sc, "muv_move_uv_enabled", text="Move UV")
+        if sc.muv_move_uv_enabled:
+            col = box.column()
+            if not MUV_OT_MoveUV.is_running(context):
+                col.operator(MUV_OT_MoveUV.bl_idname, icon='PLAY',
+                             text="Start")
+            else:
+                col.operator(MUV_OT_MoveUV.bl_idname, icon='PAUSE',
+                             text="Stop")
+
+        box = layout.box()
+        box.prop(sc, "muv_world_scale_uv_enabled", text="World Scale UV")
+        if sc.muv_world_scale_uv_enabled:
+            box.prop(sc, "muv_world_scale_uv_mode", text="")
+
+            if sc.muv_world_scale_uv_mode == 'MANUAL':
+                sp = compat.layout_split(box, 0.5)
+                col = sp.column()
+                col.prop(sc, "muv_world_scale_uv_tgt_texture_size",
+                         text="Texture Size")
+                sp = compat.layout_split(sp, 1.0)
+                col = sp.column()
+                col.label(text="Density:")
+                col.prop(sc, "muv_world_scale_uv_tgt_density", text="")
+                box.prop(sc, "muv_world_scale_uv_origin", text="Origin")
+                ops = box.operator(MUV_OT_WorldScaleUV_ApplyManual.bl_idname,
+                                   text="Apply")
+                ops.tgt_density = sc.muv_world_scale_uv_tgt_density
+                ops.tgt_texture_size = sc.muv_world_scale_uv_tgt_texture_size
+                ops.origin = sc.muv_world_scale_uv_origin
+                ops.show_dialog = False
+
+            elif sc.muv_world_scale_uv_mode == 'SAME_DENSITY':
+                sp = compat.layout_split(box, 0.4)
+                col = sp.column(align=True)
+                col.label(text="Source:")
+                sp = compat.layout_split(sp, 1.0)
+                col = sp.column(align=True)
+                col.operator(MUV_OT_WorldScaleUV_Measure.bl_idname,
+                             text="Measure")
+
+                sp = compat.layout_split(box, 0.7)
+                col = sp.column(align=True)
+                col.prop(sc, "muv_world_scale_uv_src_density", text="Density")
+                col.enabled = False
+                sp = compat.layout_split(sp, 1.0)
+                col = sp.column(align=True)
+                col.label(text="px2/cm2")
+
+                box.separator()
+                box.prop(sc, "muv_world_scale_uv_origin", text="Origin")
+                ops = box.operator(
+                    MUV_OT_WorldScaleUV_ApplyScalingDensity.bl_idname,
+                    text="Apply")
+                ops.src_density = sc.muv_world_scale_uv_src_density
+                ops.origin = sc.muv_world_scale_uv_origin
+                ops.same_density = True
+                ops.show_dialog = False
+
+            elif sc.muv_world_scale_uv_mode == 'SCALING_DENSITY':
+                sp = compat.layout_split(box, 0.4)
+                col = sp.column(align=True)
+                col.label(text="Source:")
+                sp = compat.layout_split(sp, 1.0)
+                col = sp.column(align=True)
+                col.operator(MUV_OT_WorldScaleUV_Measure.bl_idname,
+                             text="Measure")
+
+                sp = compat.layout_split(box, 0.7)
+                col = sp.column(align=True)
+                col.prop(sc, "muv_world_scale_uv_src_density", text="Density")
+                col.enabled = False
+                sp = compat.layout_split(sp, 1.0)
+                col = sp.column(align=True)
+                col.label(text="px2/cm2")
+
+                box.separator()
+                box.prop(sc, "muv_world_scale_uv_tgt_scaling_factor",
+                         text="Scaling Factor")
+                box.prop(sc, "muv_world_scale_uv_origin", text="Origin")
+                ops = box.operator(
+                    MUV_OT_WorldScaleUV_ApplyScalingDensity.bl_idname,
+                    text="Apply")
+                ops.src_density = sc.muv_world_scale_uv_src_density
+                ops.origin = sc.muv_world_scale_uv_origin
+                ops.same_density = False
+                ops.show_dialog = False
+                ops.tgt_scaling_factor = \
+                    sc.muv_world_scale_uv_tgt_scaling_factor
+
+            elif sc.muv_world_scale_uv_mode == 'PROPORTIONAL_TO_MESH':
+                sp = compat.layout_split(box, 0.4)
+                col = sp.column(align=True)
+                col.label(text="Source:")
+                sp = compat.layout_split(sp, 1.0)
+                col = sp.column(align=True)
+                col.operator(MUV_OT_WorldScaleUV_Measure.bl_idname,
+                             text="Measure")
+
+                sp = compat.layout_split(box, 0.7)
+                col = sp.column(align=True)
+                col.prop(sc, "muv_world_scale_uv_src_mesh_area",
+                         text="Mesh Area")
+                col.prop(sc, "muv_world_scale_uv_src_uv_area", text="UV Area")
+                col.prop(sc, "muv_world_scale_uv_src_density", text="Density")
+                col.enabled = False
+                sp = compat.layout_split(sp, 1.0)
+                col = sp.column(align=True)
+                col.label(text="cm2")
+                col.label(text="px2")
+                col.label(text="px2/cm2")
+                col.enabled = False
+
+                box.separator()
+                box.prop(sc, "muv_world_scale_uv_origin", text="Origin")
+                ops = box.operator(
+                    MUV_OT_WorldScaleUV_ApplyProportionalToMesh.bl_idname,
+                    text="Apply")
+                ops.src_density = sc.muv_world_scale_uv_src_density
+                ops.src_uv_area = sc.muv_world_scale_uv_src_uv_area
+                ops.src_mesh_area = sc.muv_world_scale_uv_src_mesh_area
+                ops.origin = sc.muv_world_scale_uv_origin
+                ops.show_dialog = False
+
+        box = layout.box()
+        box.prop(sc, "muv_preserve_uv_aspect_enabled",
+                 text="Preserve UV Aspect")
+        if sc.muv_preserve_uv_aspect_enabled:
+            row = box.row()
+            ops = row.operator(MUV_OT_PreserveUVAspect.bl_idname,
+                               text="Change Image")
+            ops.dest_img_name = sc.muv_preserve_uv_aspect_tex_image
+            ops.origin = sc.muv_preserve_uv_aspect_origin
+            row.prop(sc, "muv_preserve_uv_aspect_tex_image", text="")
+            box.prop(sc, "muv_preserve_uv_aspect_origin", text="Origin")
+
+        box = layout.box()
+        box.prop(sc, "muv_texture_lock_enabled", text="Texture Lock")
+        if sc.muv_texture_lock_enabled:
+            row = box.row(align=True)
+            col = row.column(align=True)
+            col.label(text="Normal Mode:")
+            col = row.column(align=True)
+            col.operator(MUV_OT_TextureLock_Lock.bl_idname,
+                         text="Lock"
+                         if not MUV_OT_TextureLock_Lock.is_ready(context)
+                         else "ReLock")
+            ops = col.operator(MUV_OT_TextureLock_Unlock.bl_idname,
+                               text="Unlock")
+            ops.connect = sc.muv_texture_lock_connect
+            col.prop(sc, "muv_texture_lock_connect", text="Connect")
+
+            row = box.row(align=True)
+            row.label(text="Interactive Mode:")
+            box.prop(sc, "muv_texture_lock_lock",
+                     text="Unlock"
+                     if MUV_OT_TextureLock_Intr.is_running(context)
+                     else "Lock",
+                     icon='RESTRICT_VIEW_OFF'
+                     if MUV_OT_TextureLock_Intr.is_running(context)
+                     else 'RESTRICT_VIEW_ON')
+
+        box = layout.box()
+        box.prop(sc, "muv_texture_wrap_enabled", text="Texture Wrap")
+        if sc.muv_texture_wrap_enabled:
+            row = box.row(align=True)
+            row.operator(MUV_OT_TextureWrap_Refer.bl_idname, text="Refer")
+            row.operator(MUV_OT_TextureWrap_Set.bl_idname, text="Set")
+            box.prop(sc, "muv_texture_wrap_set_and_refer")
+            box.prop(sc, "muv_texture_wrap_selseq")
+
+        box = layout.box()
+        box.prop(sc, "muv_uv_sculpt_enabled", text="UV Sculpt")
+        if sc.muv_uv_sculpt_enabled:
+            box.prop(sc, "muv_uv_sculpt_enable",
+                     text="Disable"if MUV_OT_UVSculpt.is_running(context)
+                     else "Enable",
+                     icon='RESTRICT_VIEW_OFF'
+                     if MUV_OT_UVSculpt.is_running(context)
+                     else 'RESTRICT_VIEW_ON')
+            col = box.column()
+            col.label(text="Brush:")
+            col.prop(sc, "muv_uv_sculpt_radius")
+            col.prop(sc, "muv_uv_sculpt_strength")
+            box.prop(sc, "muv_uv_sculpt_tools")
+            if sc.muv_uv_sculpt_tools == 'PINCH':
+                box.prop(sc, "muv_uv_sculpt_pinch_invert")
+            elif sc.muv_uv_sculpt_tools == 'RELAX':
+                box.prop(sc, "muv_uv_sculpt_relax_method")
+            box.prop(sc, "muv_uv_sculpt_show_brush")
diff --git a/magic_uv/ui/view3d_uv_mapping.py b/magic_uv/ui/view3d_uv_mapping.py
new file mode 100644
index 00000000..278d1725
--- /dev/null
+++ b/magic_uv/ui/view3d_uv_mapping.py
@@ -0,0 +1,114 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+
+from ..op.uvw import (
+    MUV_OT_UVW_BoxMap,
+    MUV_OT_UVW_BestPlanerMap,
+)
+from ..op.texture_projection import (
+    MUV_OT_TextureProjection,
+    MUV_OT_TextureProjection_Project,
+)
+from ..op.unwrap_constraint import MUV_OT_UnwrapConstraint
+from ..utils.bl_class_registry import BlClassRegistry
+from ..utils import compatibility as compat
+
+
+@BlClassRegistry()
+@compat.ChangeRegionType(region_type='TOOLS')
+class MUV_PT_View3D_UVMapping(bpy.types.Panel):
+    """
+    Panel class: UV Mapping on Property Panel on View3D
+    """
+
+    bl_space_type = 'VIEW_3D'
+    bl_region_type = 'UI'
+    bl_label = "UV Mapping"
+    bl_category = "Magic UV"
+    bl_context = 'mesh_edit'
+    bl_options = {'DEFAULT_CLOSED'}
+
+    def draw_header(self, _):
+        layout = self.layout
+        layout.label(text="", icon=compat.icon('IMAGE'))
+
+    def draw(self, context):
+        sc = context.scene
+        layout = self.layout
+
+        box = layout.box()
+        box.prop(sc, "muv_unwrap_constraint_enabled", text="Unwrap Constraint")
+        if sc.muv_unwrap_constraint_enabled:
+            ops = box.operator(MUV_OT_UnwrapConstraint.bl_idname,
+                               text="Unwrap")
+            ops.u_const = sc.muv_unwrap_constraint_u_const
+            ops.v_const = sc.muv_unwrap_constraint_v_const
+            row = box.row(align=True)
+            row.prop(sc, "muv_unwrap_constraint_u_const", text="U-Constraint")
+            row.prop(sc, "muv_unwrap_constraint_v_const", text="V-Constraint")
+
+        box = layout.box()
+        box.prop(sc, "muv_texture_projection_enabled",
+                 text="Texture Projection")
+        if sc.muv_texture_projection_enabled:
+            row = box.row()
+            row.prop(
+                sc, "muv_texture_projection_enable",
+                text="Disable"
+                if MUV_OT_TextureProjection.is_running(context)
+                else "Enable",
+                icon='RESTRICT_VIEW_OFF'
+                if MUV_OT_TextureProjection.is_running(context)
+                else 'RESTRICT_VIEW_ON')
+            row.prop(sc, "muv_texture_projection_tex_image", text="")
+            box.prop(sc, "muv_texture_projection_tex_transparency",
+                     text="Transparency")
+            col = box.column(align=True)
+            row = col.row()
+            row.prop(sc, "muv_texture_projection_adjust_window",
+                     text="Adjust Window")
+            if not sc.muv_texture_projection_adjust_window:
+                row.prop(sc, "muv_texture_projection_tex_magnitude",
+                         text="Magnitude")
+            col.prop(sc, "muv_texture_projection_apply_tex_aspect",
+                     text="Texture Aspect Ratio")
+            col.prop(sc, "muv_texture_projection_assign_uvmap",
+                     text="Assign UVMap")
+            box.operator(
+                MUV_OT_TextureProjection_Project.bl_idname,
+                text="Project")
+
+        box = layout.box()
+        box.prop(sc, "muv_uvw_enabled", text="UVW")
+        if sc.muv_uvw_enabled:
+            row = box.row(align=True)
+            ops = row.operator(MUV_OT_UVW_BoxMap.bl_idname, text="Box")
+            ops.assign_uvmap = sc.muv_uvw_assign_uvmap
+            ops = row.operator(MUV_OT_UVW_BestPlanerMap.bl_idname,
+                               text="Best Planner")
+            ops.assign_uvmap = sc.muv_uvw_assign_uvmap
+            box.prop(sc, "muv_uvw_assign_uvmap", text="Assign UVMap")
diff --git a/magic_uv/updater.py b/magic_uv/updater.py
new file mode 100644
index 00000000..8a8da2ba
--- /dev/null
+++ b/magic_uv/updater.py
@@ -0,0 +1,141 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import os
+
+import bpy
+from bpy.props import (
+    StringProperty,
+)
+
+from .utils.bl_class_registry import BlClassRegistry
+from .utils.addon_updator import (
+    AddonUpdatorManager,
+    AddonUpdatorConfig,
+    get_separator,
+)
+from .utils import compatibility as compat
+
+
+@BlClassRegistry()
+class MUV_OT_CheckAddonUpdate(bpy.types.Operator):
+    bl_idname = "uv.muv_ot_check_addon_update"
+    bl_label = "Check Update"
+    bl_description = "Check Add-on Update"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    def execute(self, _):
+        updater = AddonUpdatorManager.get_instance()
+        updater.check_update_candidate()
+
+        return {'FINISHED'}
+
+
+@BlClassRegistry()
+@compat.make_annotations
+class MUV_OT_UpdateAddon(bpy.types.Operator):
+    bl_idname = "uv.muv_ot_update_addon"
+    bl_label = "Update"
+    bl_description = "Update Add-on"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    branch_name = StringProperty(
+        name="Branch Name",
+        description="Branch name to update",
+        default="",
+    )
+
+    def execute(self, _):
+        updater = AddonUpdatorManager.get_instance()
+        updater.update(self.branch_name)
+
+        return {'FINISHED'}
+
+
+def draw_updater_ui(prefs_obj):
+    layout = prefs_obj.layout
+    updater = AddonUpdatorManager.get_instance()
+
+    layout.separator()
+
+    if not updater.candidate_checked():
+        col = layout.column()
+        col.scale_y = 2
+        row = col.row()
+        row.operator(MUV_OT_CheckAddonUpdate.bl_idname,
+                     text="Check 'Magic UV' add-on update",
+                     icon='FILE_REFRESH')
+    else:
+        row = layout.row(align=True)
+        row.scale_y = 2
+        col = row.column()
+        col.operator(MUV_OT_CheckAddonUpdate.bl_idname,
+                     text="Check 'Magic UV' add-on update",
+                     icon='FILE_REFRESH')
+        col = row.column()
+        if updater.latest_version() != "":
+            col.enabled = True
+            ops = col.operator(
+                MUV_OT_UpdateAddon.bl_idname,
+                text="Update to the latest release version (version: {})"
+                .format(updater.latest_version()),
+                icon='TRIA_DOWN_BAR')
+            ops.branch_name = updater.latest_version()
+        else:
+            col.enabled = False
+            col.operator(MUV_OT_UpdateAddon.bl_idname,
+                         text="No updates are available.")
+
+        layout.separator()
+        layout.label(text="Manual Update:")
+        row = layout.row(align=True)
+        row.prop(prefs_obj, "updater_branch_to_update", text="Target")
+        ops = row.operator(
+            MUV_OT_UpdateAddon.bl_idname, text="Update",
+            icon='TRIA_DOWN_BAR')
+        ops.branch_name = prefs_obj.updater_branch_to_update
+
+        layout.separator()
+        if updater.has_error():
+            box = layout.box()
+            box.label(text=updater.error(), icon='CANCEL')
+        elif updater.has_info():
+            box = layout.box()
+            box.label(text=updater.info(), icon='ERROR')
+
+
+def register_updater(bl_info):
+    config = AddonUpdatorConfig()
+    config.owner = "nutti"
+    config.repository = "Magic-UV"
+    config.current_addon_path = os.path.dirname(os.path.realpath(__file__))
+    config.branches = ["master", "develop"]
+    config.addon_directory = \
+        config.current_addon_path[
+            :config.current_addon_path.rfind(get_separator())]
+    config.min_release_version = bl_info["version"]
+    config.target_addon_path = "src/magic_uv"
+    updater = AddonUpdatorManager.get_instance()
+    updater.init(bl_info, config)
diff --git a/magic_uv/utils/__init__.py b/magic_uv/utils/__init__.py
new file mode 100644
index 00000000..b74ab903
--- /dev/null
+++ b/magic_uv/utils/__init__.py
@@ -0,0 +1,38 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+if "bpy" in locals():
+    import importlib
+    importlib.reload(addon_updator)
+    importlib.reload(bl_class_registry)
+    importlib.reload(compatibility)
+    importlib.reload(property_class_registry)
+else:
+    from . import addon_updator
+    from . import bl_class_registry
+    from . import compatibility
+    from . import property_class_registry
+
+import bpy
diff --git a/magic_uv/utils/addon_updator.py b/magic_uv/utils/addon_updator.py
new file mode 100644
index 00000000..b2ff76cc
--- /dev/null
+++ b/magic_uv/utils/addon_updator.py
@@ -0,0 +1,360 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+from threading import Lock
+import urllib
+import urllib.request
+import ssl
+import json
+import os
+import zipfile
+import shutil
+import datetime
+
+
+def get_separator():
+    if os.name == "nt":
+        return "\\"
+    return "/"
+
+
+def _request(url, json_decode=True):
+    # pylint: disable=W0212
+    ssl._create_default_https_context = ssl._create_unverified_context
+    req = urllib.request.Request(url)
+
+    try:
+        result = urllib.request.urlopen(req)
+    except urllib.error.HTTPError as e:
+        raise RuntimeError("HTTP error ({})".format(str(e.code)))
+    except urllib.error.URLError as e:
+        raise RuntimeError("URL error ({})".format(str(e.reason)))
+
+    data = result.read()
+    result.close()
+
+    if json_decode:
+        try:
+            return json.JSONDecoder().decode(data.decode())
+        except Exception as e:
+            raise RuntimeError("API response has invalid JSON format ({})"
+                               .format(str(e.reason)))
+
+    return data.decode()
+
+
+def _download(url, path):
+    try:
+        urllib.request.urlretrieve(url, path)
+    except urllib.error.HTTPError as e:
+        raise RuntimeError("HTTP error ({})".format(str(e.code)))
+    except urllib.error.URLError as e:
+        raise RuntimeError("URL error ({})".format(str(e.reason)))
+
+
+def _make_workspace_path(addon_dir):
+    return addon_dir + get_separator() + "addon_updator_workspace"
+
+
+def _make_workspace(addon_dir):
+    dir_path = _make_workspace_path(addon_dir)
+    os.mkdir(dir_path)
+
+
+def _make_temp_addon_path(addon_dir, url):
+    filename = url.split("/")[-1]
+    filepath = _make_workspace_path(addon_dir) + get_separator() + filename
+    return filepath
+
+
+def _download_addon(addon_dir, url):
+    filepath = _make_temp_addon_path(addon_dir, url)
+    _download(url, filepath)
+
+
+def _replace_addon(addon_dir, info, current_addon_path, offset_path=""):
+    # remove current add-on
+    if os.path.isfile(current_addon_path):
+        os.remove(current_addon_path)
+    elif os.path.isdir(current_addon_path):
+        shutil.rmtree(current_addon_path)
+
+    # replace to the new add-on
+    workspace_path = _make_workspace_path(addon_dir)
+    tmp_addon_path = _make_temp_addon_path(addon_dir, info.url)
+    _, ext = os.path.splitext(tmp_addon_path)
+    if ext == ".zip":
+        with zipfile.ZipFile(tmp_addon_path) as zf:
+            zf.extractall(workspace_path)
+        if offset_path != "":
+            src = workspace_path + get_separator() + offset_path
+            dst = addon_dir
+            shutil.move(src, dst)
+    elif ext == ".py":
+        shutil.move(tmp_addon_path, addon_dir)
+    else:
+        raise RuntimeError("Unsupported file extension. (ext: {})".format(ext))
+
+
+def _get_all_releases_data(owner, repository):
+    url = "https://api.github.com/repos/{}/{}/releases"\
+          .format(owner, repository)
+    data = _request(url)
+
+    return data
+
+
+def _get_all_branches_data(owner, repository):
+    url = "https://api.github.com/repos/{}/{}/branches"\
+          .format(owner, repository)
+    data = _request(url)
+
+    return data
+
+
+def _parse_release_version(version):
+    return [int(c) for c in version[1:].split(".")]
+
+
+# ver1 > ver2   : >  0
+# ver1 == ver2  : == 0
+# ver1 < ver2   : <  0
+def _compare_version(ver1, ver2):
+    if len(ver1) < len(ver2):
+        ver1.extend([-1 for _ in range(len(ver2) - len(ver1))])
+    elif len(ver1) > len(ver2):
+        ver2.extend([-1 for _ in range(len(ver1) - len(ver2))])
+
+    def comp(v1, v2, idx):
+        if len(v1) == idx:
+            return 0        # v1 == v2
+
+        if v1[idx] > v2[idx]:
+            return 1        # v1 > v2
+        elif v1[idx] < v2[idx]:
+            return -1       # v1 < v2
+
+        return comp(v1, v2, idx + 1)
+
+    return comp(ver1, ver2, 0)
+
+
+class AddonUpdatorConfig:
+    def __init__(self):
+        # Name of owner
+        self.owner = ""
+
+        # Name of repository
+        self.repository = ""
+
+        # Additional branch for update candidate
+        self.branches = []
+
+        # Set minimum release version for update candidate.
+        #   e.g. (5, 2) if your release tag name is "v5.2"
+        # If you specify (-1, -1), ignore versions less than current add-on
+        # version specified in bl_info.
+        self.min_release_version = (-1, -1)
+
+        # Target add-on path
+        self.target_addon_path = ""
+
+        # Current add-on path
+        self.current_addon_path = ""
+
+        # Blender add-on directory
+        self.addon_directory = ""
+
+
+class UpdateCandidateInfo:
+    def __init__(self):
+        self.name = ""
+        self.url = ""
+        self.group = ""   # BRANCH|RELEASE
+
+
+class AddonUpdatorManager:
+    __inst = None
+    __lock = Lock()
+
+    __initialized = False
+    __bl_info = None
+    __config = None
+    __update_candidate = []
+    __candidate_checked = False
+    __error = ""
+    __info = ""
+
+    def __init__(self):
+        raise NotImplementedError("Not allowed to call constructor")
+
+    @classmethod
+    def __internal_new(cls):
+        return super().__new__(cls)
+
+    @classmethod
+    def get_instance(cls):
+        if not cls.__inst:
+            with cls.__lock:
+                if not cls.__inst:
+                    cls.__inst = cls.__internal_new()
+
+        return cls.__inst
+
+    def init(self, bl_info, config):
+        self.__bl_info = bl_info
+        self.__config = config
+        self.__update_candidate = []
+        self.__candidate_checked = False
+        self.__error = ""
+        self.__info = ""
+        self.__initialized = True
+
+    def initialized(self):
+        return self.__initialized
+
+    def candidate_checked(self):
+        return self.__candidate_checked
+
+    def check_update_candidate(self):
+        if not self.initialized():
+            raise RuntimeError("AddonUpdatorManager must be initialized")
+
+        self.__update_candidate = []
+        self.__candidate_checked = False
+
+        try:
+            # setup branch information
+            branches = _get_all_branches_data(self.__config.owner,
+                                              self.__config.repository)
+            for b in branches:
+                if b["name"] in self.__config.branches:
+                    info = UpdateCandidateInfo()
+                    info.name = b["name"]
+                    info.url = "https://github.com/{}/{}/archive/{}.zip"\
+                               .format(self.__config.owner,
+                                       self.__config.repository, b["name"])
+                    info.group = 'BRANCH'
+                    self.__update_candidate.append(info)
+
+            # setup release information
+            releases = _get_all_releases_data(self.__config.owner,
+                                              self.__config.repository)
+            for r in releases:
+                if _compare_version(_parse_release_version(r["tag_name"]),
+                                    self.__config.min_release_version) > 0:
+                    info = UpdateCandidateInfo()
+                    info.name = r["tag_name"]
+                    info.url = r["assets"][0]["browser_download_url"]
+                    info.group = 'RELEASE'
+                    self.__update_candidate.append(info)
+        except RuntimeError as e:
+            self.__error = "Failed to check update {}. ({})"\
+                           .format(str(e), datetime.datetime.now())
+
+        self.__info = "Checked update. ({})"\
+                      .format(datetime.datetime.now())
+
+        self.__candidate_checked = True
+
+    def has_error(self):
+        return self.__error != ""
+
+    def error(self):
+        return self.__error
+
+    def has_info(self):
+        return self.__info != ""
+
+    def info(self):
+        return self.__info
+
+    def update(self, version_name):
+        if not self.initialized():
+            raise RuntimeError("AddonUpdatorManager must be initialized.")
+
+        if not self.candidate_checked():
+            raise RuntimeError("Update candidate is not checked.")
+
+        info = None
+        for info in self.__update_candidate:
+            if info.name == version_name:
+                break
+        else:
+            raise RuntimeError("{} is not found in update candidate"
+                               .format(version_name))
+
+        if info is None:
+            raise RuntimeError("Not found any update candidates")
+
+        try:
+            # create workspace
+            _make_workspace(self.__config.addon_directory)
+            # download add-on
+            _download_addon(self.__config.addon_directory, info.url)
+
+            # replace add-on
+            offset_path = ""
+            if info.group == 'BRANCH':
+                offset_path = "{}-{}{}{}".format(
+                    self.__config.repository, info.name, get_separator(),
+                    self.__config.target_addon_path)
+            elif info.group == 'RELEASE':
+                offset_path = self.__config.target_addon_path
+            _replace_addon(self.__config.addon_directory,
+                           info, self.__config.current_addon_path,
+                           offset_path)
+
+            self.__info = "Updated to {}. ({})" \
+                          .format(info.name, datetime.datetime.now())
+        except RuntimeError as e:
+            self.__error = "Failed to update {}. ({})"\
+                           .format(str(e), datetime.datetime.now())
+
+        shutil.rmtree(_make_workspace_path(self.__config.addon_directory))
+
+    def get_candidate_branch_names(self):
+        if not self.initialized():
+            raise RuntimeError("AddonUpdatorManager must be initialized.")
+
+        if not self.candidate_checked():
+            raise RuntimeError("Update candidate is not checked.")
+
+        return [info.name for info in self.__update_candidate]
+
+    def latest_version(self):
+        release_versions = [info.name
+                            for info in self.__update_candidate
+                            if info.group == 'RELEASE']
+
+        latest = ""
+        for version in release_versions:
+            if latest == "":
+                latest = version
+            elif _compare_version(_parse_release_version(version),
+                                  _parse_release_version(latest)) > 0:
+                latest = version
+
+        return latest
diff --git a/magic_uv/utils/bl_class_registry.py b/magic_uv/utils/bl_class_registry.py
new file mode 100644
index 00000000..81e4b770
--- /dev/null
+++ b/magic_uv/utils/bl_class_registry.py
@@ -0,0 +1,80 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+
+from .. import common
+
+
+class BlClassRegistry:
+    class_list = []
+
+    def __init__(self, *_, **kwargs):
+        self.legacy = kwargs.get('legacy', False)
+
+    def __call__(self, cls):
+        if hasattr(cls, "bl_idname"):
+            BlClassRegistry.add_class(cls.bl_idname, cls, self.legacy)
+        else:
+            bl_idname = "{}{}{}{}".format(cls.bl_space_type,
+                                          cls.bl_region_type,
+                                          cls.bl_context, cls.bl_label)
+            BlClassRegistry.add_class(bl_idname, cls, self.legacy)
+        return cls
+
+    @classmethod
+    def add_class(cls, bl_idname, op_class, legacy):
+        for class_ in cls.class_list:
+            if (class_["bl_idname"] == bl_idname) and \
+               (class_["legacy"] == legacy):
+                raise RuntimeError("{} is already registered"
+                                   .format(bl_idname))
+
+        new_op = {
+            "bl_idname": bl_idname,
+            "class": op_class,
+            "legacy": legacy,
+        }
+        cls.class_list.append(new_op)
+        common.debug_print("{} is registered.".format(bl_idname))
+
+    @classmethod
+    def register(cls):
+        for class_ in cls.class_list:
+            bpy.utils.register_class(class_["class"])
+            common.debug_print("{} is registered to Blender."
+                               .format(class_["bl_idname"]))
+
+    @classmethod
+    def unregister(cls):
+        for class_ in cls.class_list:
+            bpy.utils.unregister_class(class_["class"])
+            common.debug_print("{} is unregistered from Blender."
+                               .format(class_["bl_idname"]))
+
+    @classmethod
+    def cleanup(cls):
+        cls.class_list = []
+        common.debug_print("Cleanup registry.")
diff --git a/magic_uv/utils/compatibility.py b/magic_uv/utils/compatibility.py
new file mode 100644
index 00000000..ffa1d8b4
--- /dev/null
+++ b/magic_uv/utils/compatibility.py
@@ -0,0 +1,189 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+import bpy
+import bgl
+import blf
+
+
+def check_version(major, minor, _):
+    """
+    Check blender version
+    """
+
+    if bpy.app.version[0] == major and bpy.app.version[1] == minor:
+        return 0
+    if bpy.app.version[0] > major:
+        return 1
+    if bpy.app.version[1] > minor:
+        return 1
+    return -1
+
+
+def make_annotations(cls):
+    if check_version(2, 80, 0) < 0:
+        return cls
+
+    # make annotation from attributes
+    props = {k: v for k, v in cls.__dict__.items() if isinstance(v, tuple)}
+    if props:
+        if '__annotations__' not in cls.__dict__:
+            setattr(cls, '__annotations__', {})
+        annotations = cls.__dict__['__annotations__']
+        for k, v in props.items():
+            annotations[k] = v
+            delattr(cls, k)
+
+    return cls
+
+
+class ChangeRegionType:
+    def __init__(self, *_, **kwargs):
+        self.region_type = kwargs.get('region_type', False)
+
+    def __call__(self, cls):
+        if check_version(2, 80, 0) >= 0:
+            return cls
+
+        cls.bl_region_type = self.region_type
+
+        return cls
+
+
+def matmul(m1, m2):
+    if check_version(2, 80, 0) < 0:
+        return m1 * m2
+
+    return m1 @ m2
+
+
+def layout_split(layout, factor=0.0, align=False):
+    if check_version(2, 80, 0) < 0:
+        return layout.split(percentage=factor, align=align)
+
+    return layout.split(factor=factor, align=align)
+
+
+def get_user_preferences(context):
+    if hasattr(context, "user_preferences"):
+        return context.user_preferences
+
+    return context.preferences
+
+
+def get_object_select(obj):
+    if check_version(2, 80, 0) < 0:
+        return obj.select
+
+    return obj.select_get()
+
+
+def set_active_object(obj):
+    if check_version(2, 80, 0) < 0:
+        bpy.context.scene.objects.active = obj
+    else:
+        bpy.context.view_layer.objects.active = obj
+
+
+def get_active_object(context):
+    if check_version(2, 80, 0) >= 0:
+        return context.scene.active_object
+    else:
+        return context.active_object
+
+
+def object_has_uv_layers(obj):
+    if check_version(2, 80, 0) < 0:
+        return hasattr(obj.data, "uv_textures")
+    else:
+        return hasattr(obj.data, "uv_layers")
+
+
+def get_object_uv_layers(obj):
+    if check_version(2, 80, 0) < 0:
+        return obj.data.uv_textures
+    else:
+        return obj.data.uv_layers
+
+
+def icon(icon):
+    if icon == 'IMAGE':
+        if check_version(2, 80, 0) < 0:
+            return 'IMAGE_COL'
+
+    return icon
+
+
+def set_blf_font_color(font_id, r, g, b, a):
+    if check_version(2, 80, 0) >= 0:
+        blf.color(font_id, r, g, b, a)
+    else:
+        bgl.glColor4f(r, g, b, a)
+
+
+def set_blf_blur(font_id, radius):
+    if check_version(2, 80, 0) < 0:
+        blf.blur(font_id, radius)
+
+
+def get_all_space_types():
+    if check_version(2, 80, 0) >= 0:
+        return {
+            'CLIP_EDITOR': bpy.types.SpaceClipEditor,
+            'CONSOLE': bpy.types.SpaceConsole,
+            'DOPESHEET_EDITOR': bpy.types.SpaceDopeSheetEditor,
+            'FILE_BROWSER': bpy.types.SpaceFileBrowser,
+            'GRAPH_EDITOR': bpy.types.SpaceGraphEditor,
+            'IMAGE_EDITOR': bpy.types.SpaceImageEditor,
+            'INFO': bpy.types.SpaceInfo,
+            'NLA_EDITOR': bpy.types.SpaceNLA,
+            'NODE_EDITOR': bpy.types.SpaceNodeEditor,
+            'OUTLINER': bpy.types.SpaceOutliner,
+            'PROPERTIES': bpy.types.SpaceProperties,
+            'SEQUENCE_EDITOR': bpy.types.SpaceSequenceEditor,
+            'TEXT_EDITOR': bpy.types.SpaceTextEditor,
+            'USER_PREFERENCES': bpy.types.SpacePreferences,
+            'VIEW_3D': bpy.types.SpaceView3D,
+        }
+    else:
+        return {
+            'VIEW_3D': bpy.types.SpaceView3D,
+            'TIMELINE': bpy.types.SpaceTimeline,
+            'GRAPH_EDITOR': bpy.types.SpaceGraphEditor,
+            'DOPESHEET_EDITOR': bpy.types.SpaceDopeSheetEditor,
+            'NLA_EDITOR': bpy.types.SpaceNLA,
+            'IMAGE_EDITOR': bpy.types.SpaceImageEditor,
+            'SEQUENCE_EDITOR': bpy.types.SpaceSequenceEditor,
+            'CLIP_EDITOR': bpy.types.SpaceClipEditor,
+            'TEXT_EDITOR': bpy.types.SpaceTextEditor,
+            'NODE_EDITOR': bpy.types.SpaceNodeEditor,
+            'LOGIC_EDITOR': bpy.types.SpaceLogicEditor,
+            'PROPERTIES': bpy.types.SpaceProperties,
+            'OUTLINER': bpy.types.SpaceOutliner,
+            'USER_PREFERENCES': bpy.types.SpaceUserPreferences,
+            'INFO': bpy.types.SpaceInfo,
+            'FILE_BROWSER': bpy.types.SpaceFileBrowser,
+            'CONSOLE': bpy.types.SpaceConsole,
+        }
diff --git a/magic_uv/utils/property_class_registry.py b/magic_uv/utils/property_class_registry.py
new file mode 100644
index 00000000..e99cd28b
--- /dev/null
+++ b/magic_uv/utils/property_class_registry.py
@@ -0,0 +1,68 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "6.0"
+__date__ = "26 Jan 2019"
+
+from .. import common
+
+
+class PropertyClassRegistry:
+    class_list = []
+
+    def __init__(self, *_, **kwargs):
+        self.legacy = kwargs.get('legacy', False)
+
+    def __call__(self, cls):
+        PropertyClassRegistry.add_class(cls.idname, cls, self.legacy)
+        return cls
+
+    @classmethod
+    def add_class(cls, idname, prop_class, legacy):
+        for class_ in cls.class_list:
+            if (class_["idname"] == idname) and (class_["legacy"] == legacy):
+                raise RuntimeError("{} is already registered".format(idname))
+
+        new_op = {
+            "idname": idname,
+            "class": prop_class,
+            "legacy": legacy,
+        }
+        cls.class_list.append(new_op)
+        common.debug_print("{} is registered.".format(idname))
+
+    @classmethod
+    def init_props(cls, scene):
+        for class_ in cls.class_list:
+            class_["class"].init_props(scene)
+            common.debug_print("{} is initialized.".format(class_["idname"]))
+
+    @classmethod
+    def del_props(cls, scene):
+        for class_ in cls.class_list:
+            class_["class"].del_props(scene)
+            common.debug_print("{} is cleared.".format(class_["idname"]))
+
+    @classmethod
+    def cleanup(cls):
+        cls.class_list = []
+        common.debug_print("Cleanup registry.")