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# SPDX-License-Identifier: GPL-2.0-or-later
import bpy
from bpy.types import Operator
from bpy.props import (
EnumProperty,
IntProperty,
)
class MeshMirrorUV(Operator):
"""Copy mirror UV coordinates on the X axis based on a mirrored mesh"""
bl_idname = "mesh.faces_mirror_uv"
bl_label = "Copy Mirrored UV Coords"
bl_options = {'REGISTER', 'UNDO'}
direction: EnumProperty(
name="Axis Direction",
items=(
('POSITIVE', "Positive", ""),
('NEGATIVE', "Negative", ""),
),
)
precision: IntProperty(
name="Precision",
description=("Tolerance for finding vertex duplicates"),
min=1, max=16,
soft_min=1, soft_max=16,
default=3,
)
# Returns has_active_UV_layer, double_warn.
def do_mesh_mirror_UV(self, mesh, DIR):
precision = self.precision
double_warn = 0
if not mesh.uv_layers.active:
# has_active_UV_layer, double_warn
return False, 0
# mirror lookups
mirror_gt = {}
mirror_lt = {}
vcos = (v.co.to_tuple(precision) for v in mesh.vertices)
for i, co in enumerate(vcos):
if co[0] >= 0.0:
double_warn += co in mirror_gt
mirror_gt[co] = i
if co[0] <= 0.0:
double_warn += co in mirror_lt
mirror_lt[co] = i
vmap = {}
for mirror_a, mirror_b in ((mirror_gt, mirror_lt),
(mirror_lt, mirror_gt)):
for co, i in mirror_a.items():
nco = (-co[0], co[1], co[2])
j = mirror_b.get(nco)
if j is not None:
vmap[i] = j
polys = mesh.polygons
loops = mesh.loops
uv_loops = mesh.uv_layers.active.data
nbr_polys = len(polys)
mirror_pm = {}
pmap = {}
puvs = [None] * nbr_polys
puvs_cpy = [None] * nbr_polys
puvsel = [None] * nbr_polys
pcents = [None] * nbr_polys
vidxs = [None] * nbr_polys
for i, p in enumerate(polys):
lstart = lend = p.loop_start
lend += p.loop_total
puvs[i] = tuple(uv.uv for uv in uv_loops[lstart:lend])
puvs_cpy[i] = tuple(uv.copy() for uv in puvs[i])
puvsel[i] = (False not in
(uv.select for uv in uv_loops[lstart:lend]))
# Vert idx of the poly.
vidxs[i] = tuple(l.vertex_index for l in loops[lstart:lend])
pcents[i] = p.center
# Preparing next step finding matching polys.
mirror_pm[tuple(sorted(vidxs[i]))] = i
for i in range(nbr_polys):
# Find matching mirror poly.
tvidxs = [vmap.get(j) for j in vidxs[i]]
if None not in tvidxs:
tvidxs.sort()
j = mirror_pm.get(tuple(tvidxs))
if j is not None:
pmap[i] = j
for i, j in pmap.items():
if not puvsel[i] or not puvsel[j]:
continue
elif DIR == 0 and pcents[i][0] < 0.0:
continue
elif DIR == 1 and pcents[i][0] > 0.0:
continue
# copy UVs
uv1 = puvs[i]
uv2 = puvs_cpy[j]
# get the correct rotation
v1 = vidxs[j]
v2 = tuple(vmap[k] for k in vidxs[i])
if len(v1) == len(v2):
for k in range(len(v1)):
k_map = v1.index(v2[k])
uv1[k].xy = - (uv2[k_map].x - 0.5) + 0.5, uv2[k_map].y
# has_active_UV_layer, double_warn
return True, double_warn
@classmethod
def poll(cls, context):
obj = context.view_layer.objects.active
return (obj and obj.type == 'MESH')
def execute(self, context):
DIR = (self.direction == 'NEGATIVE')
total_no_active_UV = 0
total_duplicates = 0
meshes_with_duplicates = 0
ob = context.view_layer.objects.active
is_editmode = (ob.mode == 'EDIT')
if is_editmode:
bpy.ops.object.mode_set(mode='OBJECT', toggle=False)
meshes = [ob.data for ob in context.view_layer.objects.selected
if ob.type == 'MESH' and ob.data.library is None]
for mesh in meshes:
mesh.tag = False
for mesh in meshes:
if mesh.tag:
continue
mesh.tag = True
has_active_UV_layer, double_warn = self.do_mesh_mirror_UV(mesh, DIR)
if not has_active_UV_layer:
total_no_active_UV = total_no_active_UV + 1
elif double_warn:
total_duplicates += double_warn
meshes_with_duplicates = meshes_with_duplicates + 1
if is_editmode:
bpy.ops.object.mode_set(mode='EDIT', toggle=False)
if total_duplicates and total_no_active_UV:
self.report({'WARNING'},
"%d mesh(es) with no active UV layer, "
"%d duplicates found in %d mesh(es), mirror may be incomplete"
% (total_no_active_UV,
total_duplicates,
meshes_with_duplicates))
elif total_no_active_UV:
self.report({'WARNING'},
"%d mesh(es) with no active UV layer"
% (total_no_active_UV,))
elif total_duplicates:
self.report({'WARNING'},
"%d duplicates found in %d mesh(es), mirror may be incomplete"
% (total_duplicates, meshes_with_duplicates))
return {'FINISHED'}
class MeshSelectNext(Operator):
"""Select the next element (using selection order)"""
bl_idname = "mesh.select_next_item"
bl_label = "Select Next Element"
bl_options = {'REGISTER', 'UNDO'}
@classmethod
def poll(cls, context):
return (context.mode == 'EDIT_MESH')
def execute(self, context):
import bmesh
from .bmesh import find_adjacent
obj = context.active_object
me = obj.data
bm = bmesh.from_edit_mesh(me)
if find_adjacent.select_next(bm, self.report):
bm.select_flush_mode()
bmesh.update_edit_mesh(me, loop_triangles=False)
return {'FINISHED'}
class MeshSelectPrev(Operator):
"""Select the previous element (using selection order)"""
bl_idname = "mesh.select_prev_item"
bl_label = "Select Previous Element"
bl_options = {'REGISTER', 'UNDO'}
@classmethod
def poll(cls, context):
return (context.mode == 'EDIT_MESH')
def execute(self, context):
import bmesh
from .bmesh import find_adjacent
obj = context.active_object
me = obj.data
bm = bmesh.from_edit_mesh(me)
if find_adjacent.select_prev(bm, self.report):
bm.select_flush_mode()
bmesh.update_edit_mesh(me, loop_triangles=False)
return {'FINISHED'}
classes = (
MeshMirrorUV,
MeshSelectNext,
MeshSelectPrev,
)
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