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# ##### 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 #####
# <pep8 compliant>
#for full docs see...
# http://mediawiki.blender.org/index.php/Scripts/Manual/UV_Calculate/Follow_active_quads
import bpy
from bpy.types import Operator
def extend(obj, operator, EXTEND_MODE):
import bmesh
me = obj.data
# script will fail without UVs
if not me.uv_textures:
me.uv_textures.new()
bm = bmesh.from_edit_mesh(me)
f_act = bm.faces.active
uv_act = bm.loops.layers.uv.active
if f_act is None:
operator.report({'ERROR'}, "No active face")
return
elif len(f_act.verts) != 4:
operator.report({'ERROR'}, "Active face must be a quad")
return
faces = [f for f in bm.faces if f.select and len(f.verts) == 4]
for f in faces:
f.tag = False
f_act.tag = True
# our own local walker
def walk_face(f):
# all faces in this list must be tagged
f.tag = True
faces_a = [f]
faces_b = []
while faces_a:
for f in faces_a:
for l in f.loops:
l_edge = l.edge
if (l_edge.is_manifold is True) and (l_edge.seam is False):
l_other = l.link_loop_radial_next
f_other = l_other.face
if not f_other.tag:
yield (f, l, f_other)
f_other.tag = True
faces_b.append(f_other)
# swap
faces_a, faces_b = faces_b, faces_a
faces_b.clear()
def extrapolate_uv(fac,
l_a_outer, l_a_inner,
l_b_outer, l_b_inner):
l_b_inner[:] = l_a_inner
l_b_outer[:] = l_a_inner + ((l_a_inner - l_a_outer) * fac)
def apply_uv(f_prev, l_prev, f_next):
l_a = [None, None, None, None]
l_b = [None, None, None, None]
l_a[0] = l_prev
l_a[1] = l_a[0].link_loop_next
l_a[2] = l_a[1].link_loop_next
l_a[3] = l_a[2].link_loop_next
# l_b
# +-----------+
# |(3) |(2)
# | |
# |l_next(0) |(1)
# +-----------+
# ^
# l_a |
# +-----------+
# |l_prev(0) |(1)
# | (f) |
# |(3) |(2)
# +-----------+
# copy from this face to the one above.
# get the other loops
l_next = l_prev.link_loop_radial_next
if l_next.vert != l_prev.vert:
l_b[1] = l_next
l_b[0] = l_b[1].link_loop_next
l_b[3] = l_b[0].link_loop_next
l_b[2] = l_b[3].link_loop_next
else:
l_b[0] = l_next
l_b[1] = l_b[0].link_loop_next
l_b[2] = l_b[1].link_loop_next
l_b[3] = l_b[2].link_loop_next
l_a_uv = [l[uv_act].uv for l in l_a]
l_b_uv = [l[uv_act].uv for l in l_b]
if EXTEND_MODE == 'LENGTH':
a0, b0, c0 = l_a[3].vert.co, l_a[0].vert.co, l_b[3].vert.co
a1, b1, c1 = l_a[2].vert.co, l_a[1].vert.co, l_b[2].vert.co
d1 = (a0 - b0).length + (a1 - b1).length
d2 = (b0 - c0).length + (b1 - c1).length
try:
fac = d2 / d1
except ZeroDivisionError:
fac = 1.0
else:
fac = 1.0
extrapolate_uv(fac,
l_a_uv[3], l_a_uv[0],
l_b_uv[3], l_b_uv[0])
extrapolate_uv(fac,
l_a_uv[2], l_a_uv[1],
l_b_uv[2], l_b_uv[1])
for f_triple in walk_face(f_act):
apply_uv(*f_triple)
bmesh.update_edit_mesh(me, False)
def main(context, operator):
obj = context.active_object
extend(obj, operator, operator.properties.mode)
class FollowActiveQuads(Operator):
"""Follow UVs from active quads along continuous face loops"""
bl_idname = "uv.follow_active_quads"
bl_label = "Follow Active Quads"
bl_options = {'REGISTER', 'UNDO'}
mode = bpy.props.EnumProperty(
name="Edge Length Mode",
description="Method to space UV edge loops",
items=(('EVEN', "Even", "Space all UVs evenly"),
('LENGTH', "Length", "Average space UVs edge length of each loop")),
default='LENGTH',
)
@classmethod
def poll(cls, context):
obj = context.active_object
return (obj is not None and obj.type == 'MESH')
def execute(self, context):
main(context, self)
return {'FINISHED'}
def invoke(self, context, event):
wm = context.window_manager
return wm.invoke_props_dialog(self)
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