252 lines
9.1 KiB
Python
252 lines
9.1 KiB
Python
# ##### BEGIN GPL LICENSE BLOCK #####
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# ##### END GPL LICENSE BLOCK #####
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# <pep8 compliant>
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#for full docs see...
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# http://mediawiki.blender.org/index.php/Scripts/Manual/UV_Calculate/Follow_active_quads
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import bpy
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from bpy.types import Operator
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def extend(obj, operator, EXTEND_MODE):
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from bpy_extras import mesh_utils
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me = obj.data
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me_verts = me.vertices
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# script will fail without UVs
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if not me.uv_textures:
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me.uv_textures.new()
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# Toggle Edit mode
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is_editmode = (obj.mode == 'EDIT')
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if is_editmode:
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bpy.ops.object.mode_set(mode='OBJECT')
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#t = sys.time()
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edge_average_lengths = {}
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OTHER_INDEX = 2, 3, 0, 1
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def extend_uvs(face_source, face_target, edge_key):
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'''
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Takes 2 faces,
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Projects its extends its UV coords onto the face next to it.
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Both faces must share an edge
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'''
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def face_edge_vs(vi):
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vlen = len(vi)
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return [(vi[i], vi[(i + 1) % vlen]) for i in range(vlen)]
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vidx_source = face_source.vertices
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vidx_target = face_target.vertices
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uv_layer = me.uv_loop_layers.active.data
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uvs_source = [uv_layer[i].uv for i in face_source.loops]
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uvs_target = [uv_layer[i].uv for i in face_target.loops]
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# vertex index is the key, uv is the value
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uvs_vhash_source = {vindex: uvs_source[i] for i, vindex in enumerate(vidx_source)}
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uvs_vhash_target = {vindex: uvs_target[i] for i, vindex in enumerate(vidx_target)}
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edge_idxs_source = face_edge_vs(vidx_source)
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edge_idxs_target = face_edge_vs(vidx_target)
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source_matching_edge = -1
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target_matching_edge = -1
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edge_key_swap = edge_key[1], edge_key[0]
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try:
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source_matching_edge = edge_idxs_source.index(edge_key)
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except:
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source_matching_edge = edge_idxs_source.index(edge_key_swap)
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try:
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target_matching_edge = edge_idxs_target.index(edge_key)
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except:
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target_matching_edge = edge_idxs_target.index(edge_key_swap)
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edgepair_inner_source = edge_idxs_source[source_matching_edge]
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edgepair_inner_target = edge_idxs_target[target_matching_edge]
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edgepair_outer_source = edge_idxs_source[OTHER_INDEX[source_matching_edge]]
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edgepair_outer_target = edge_idxs_target[OTHER_INDEX[target_matching_edge]]
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if edge_idxs_source[source_matching_edge] == edge_idxs_target[target_matching_edge]:
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iA = 0 # Flipped, most common
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iB = 1
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else: # The normals of these faces must be different
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iA = 1
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iB = 0
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# Set the target UV's touching source face, no tricky calculations needed,
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uvs_vhash_target[edgepair_inner_target[0]][:] = uvs_vhash_source[edgepair_inner_source[iA]]
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uvs_vhash_target[edgepair_inner_target[1]][:] = uvs_vhash_source[edgepair_inner_source[iB]]
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# Set the 2 UV's on the target face that are not touching
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# for this we need to do basic expanding on the source faces UV's
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if EXTEND_MODE == 'LENGTH':
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try: # divide by zero is possible
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'''
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measure the length of each face from the middle of each edge to the opposite
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along the axis we are copying, use this
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'''
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i1a = edgepair_outer_target[iB]
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i2a = edgepair_inner_target[iA]
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if i1a > i2a:
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i1a, i2a = i2a, i1a
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i1b = edgepair_outer_source[iB]
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i2b = edgepair_inner_source[iA]
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if i1b > i2b:
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i1b, i2b = i2b, i1b
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# print edge_average_lengths
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factor = edge_average_lengths[i1a, i2a][0] / edge_average_lengths[i1b, i2b][0]
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except:
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# Div By Zero?
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factor = 1.0
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uvs_vhash_target[edgepair_outer_target[iB]][:] = uvs_vhash_source[edgepair_inner_source[0]] + factor * (uvs_vhash_source[edgepair_inner_source[0]] - uvs_vhash_source[edgepair_outer_source[1]])
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uvs_vhash_target[edgepair_outer_target[iA]][:] = uvs_vhash_source[edgepair_inner_source[1]] + factor * (uvs_vhash_source[edgepair_inner_source[1]] - uvs_vhash_source[edgepair_outer_source[0]])
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else:
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# same as above but with no factors
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uvs_vhash_target[edgepair_outer_target[iB]][:] = uvs_vhash_source[edgepair_inner_source[0]] + (uvs_vhash_source[edgepair_inner_source[0]] - uvs_vhash_source[edgepair_outer_source[1]])
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uvs_vhash_target[edgepair_outer_target[iA]][:] = uvs_vhash_source[edgepair_inner_source[1]] + (uvs_vhash_source[edgepair_inner_source[1]] - uvs_vhash_source[edgepair_outer_source[0]])
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face_act = me.polygons.active
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if face_act == -1:
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operator.report({'ERROR'}, "No active face")
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return
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face_sel = [f for f in me.polygons if len(f.vertices) == 4 and f.select]
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face_act_local_index = -1
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for i, f in enumerate(face_sel):
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if f.index == face_act:
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face_act_local_index = i
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break
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if face_act_local_index == -1:
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operator.report({'ERROR'}, "Active face not selected")
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return
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# Modes
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# 0 not yet searched for.
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# 1:mapped, use search from this face - removed!
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# 2:all siblings have been searched. don't search again.
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face_modes = [0] * len(face_sel)
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face_modes[face_act_local_index] = 1 # extend UV's from this face.
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# Edge connectivity
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edge_faces = {}
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for i, f in enumerate(face_sel):
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for edkey in f.edge_keys:
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try:
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edge_faces[edkey].append(i)
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except:
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edge_faces[edkey] = [i]
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if EXTEND_MODE == 'LENGTH':
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edge_loops = mesh_utils.edge_loops_from_faces(me, face_sel, [ed.key for ed in me.edges if ed.use_seam])
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me_verts = me.vertices
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for loop in edge_loops:
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looplen = [0.0]
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for ed in loop:
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edge_average_lengths[ed] = looplen
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looplen[0] += (me_verts[ed[0]].co - me_verts[ed[1]].co).length
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looplen[0] = looplen[0] / len(loop)
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# remove seams, so we don't map across seams.
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for ed in me.edges:
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if ed.use_seam:
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# remove the edge pair if we can
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try:
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del edge_faces[ed.key]
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except:
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pass
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# Done finding seams
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# face connectivity - faces around each face
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# only store a list of indices for each face.
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face_faces = [[] for i in range(len(face_sel))]
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for edge_key, faces in edge_faces.items():
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if len(faces) == 2: # Only do edges with 2 face users for now
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face_faces[faces[0]].append((faces[1], edge_key))
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face_faces[faces[1]].append((faces[0], edge_key))
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# Now we know what face is connected to what other face, map them by connectivity
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ok = True
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while ok:
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ok = False
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for i in range(len(face_sel)):
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if face_modes[i] == 1: # searchable
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for f_sibling, edge_key in face_faces[i]:
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if face_modes[f_sibling] == 0:
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face_modes[f_sibling] = 1 # mapped and search from.
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extend_uvs(face_sel[i], face_sel[f_sibling], edge_key)
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face_modes[i] = 1 # we can map from this one now.
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ok = True # keep searching
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face_modes[i] = 2 # don't search again
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if is_editmode:
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bpy.ops.object.mode_set(mode='EDIT')
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else:
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me.update_tag()
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def main(context, operator):
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obj = context.active_object
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extend(obj, operator, operator.properties.mode)
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class FollowActiveQuads(Operator):
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'''Follow UVs from active quads along continuous face loops'''
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bl_idname = "uv.follow_active_quads"
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bl_label = "Follow Active Quads"
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bl_options = {'REGISTER', 'UNDO'}
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mode = bpy.props.EnumProperty(
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name="Edge Length Mode",
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description="Method to space UV edge loops",
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items=(('EVEN', "Even", "Space all UVs evently"),
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('LENGTH', "Length", "Average space UVs edge length of each loop")),
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default='LENGTH',
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)
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@classmethod
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def poll(cls, context):
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obj = context.active_object
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return (obj is not None and obj.type == 'MESH')
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def execute(self, context):
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main(context, self)
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return {'FINISHED'}
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def invoke(self, context, event):
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wm = context.window_manager
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return wm.invoke_props_dialog(self)
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