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# SPDX-License-Identifier: GPL-2.0-or-later
# ---------------------------- ADAPTIVE DUPLIFACES --------------------------- #
# ------------------------------- version 0.84 ------------------------------- #
# #
# Creates duplicates of selected mesh to active morphing the shape according #
# to target faces. #
# #
# (c) Alessandro Zomparelli #
# (2017) #
# #
# http://www.co-de-it.com/ #
# #
# ############################################################################ #
import bpy
from bpy.types import (
Operator,
Panel,
PropertyGroup,
)
from bpy.props import (
BoolProperty,
EnumProperty,
FloatProperty,
IntProperty,
StringProperty,
PointerProperty
)
from mathutils import Vector, Quaternion, Matrix
import numpy as np
from math import *
import random, time, copy
import bmesh
from .utils import *
class polyhedra_wireframe(Operator):
bl_idname = "object.polyhedra_wireframe"
bl_label = "Tissue Polyhedra Wireframe"
bl_description = "Generate wireframes around the faces.\
\nDoesn't works with boundary edges.\
\n(Experimental)"
bl_options = {'REGISTER', 'UNDO'}
thickness : FloatProperty(
name="Thickness", default=0.1, min=0.001, soft_max=200,
description="Wireframe thickness"
)
subdivisions : IntProperty(
name="Segments", default=1, min=1, soft_max=10,
description="Max sumber of segments, used for the longest edge"
)
#regular_sections : BoolProperty(
# name="Regular Sections", default=False,
# description="Turn inner loops into polygons"
# )
dissolve_inners : BoolProperty(
name="Dissolve Inners", default=False,
description="Dissolve inner edges"
)
@classmethod
def poll(cls, context):
try:
#bool_tessellated = context.object.tissue_tessellate.generator != None
ob = context.object
return ob.type == 'MESH' and ob.mode == 'OBJECT'# and bool_tessellated
except:
return False
def invoke(self, context, event):
return context.window_manager.invoke_props_dialog(self)
def execute(self, context):
merge_dist = self.thickness*0.001
subs = self.subdivisions
start_time = time.time()
ob = context.object
me = simple_to_mesh(ob)
bm = bmesh.new()
bm.from_mesh(me)
bm.verts.ensure_lookup_table()
bm.edges.ensure_lookup_table()
bm.faces.ensure_lookup_table()
# Subdivide edges
proportional_subs = True
if subs > 1 and proportional_subs:
wire_length = [e.calc_length() for e in bm.edges]
all_edges = list(bm.edges)
max_segment = max(wire_length)/subs
split_edges = [[] for i in range(subs+1)]
for e, l in zip(all_edges, wire_length):
split_edges[int(l//max_segment)].append(e)
for i in range(2,subs):
perc = {}
for e in split_edges[i]:
perc[e]=0.1
bmesh.ops.bisect_edges(bm, edges=split_edges[i], cuts=i, edge_percents=perc)
### Create double faces
double_faces = []
double_layer_edge = []
double_layer_piece = []
for f in bm.faces:
verts0 = [v.co for v in f.verts]
verts1 = [v.co for v in f.verts]
verts1.reverse()
double_faces.append(verts0)
double_faces.append(verts1)
# Create new bmesh object and data layers
bm1 = bmesh.new()
# Create faces and assign Edge Layers
for verts in double_faces:
new_verts = []
for v in verts:
vert = bm1.verts.new(v)
new_verts.append(vert)
bm1.faces.new(new_verts)
bm1.verts.ensure_lookup_table()
bm1.edges.ensure_lookup_table()
bm1.faces.ensure_lookup_table()
n_faces = len(bm.faces)
n_doubles = len(bm1.faces)
polyhedra = []
for e in bm.edges:
done = []
# ERROR: Naked edges
e_faces = len(e.link_faces)
if e_faces < 2:
bm.free()
bm1.free()
message = "Naked edges are not allowed"
self.report({'ERROR'}, message)
return {'CANCELLED'}
edge_vec = e.verts[1].co - e.verts[0].co
# run first face
for i1 in range(e_faces-1):
f1 = e.link_faces[i1]
#edge_verts1 = [v.index for v in f1.verts if v in e.verts]
verts1 = [v.index for v in f1.verts]
va1 = verts1.index(e.verts[0].index)
vb1 = verts1.index(e.verts[1].index)
# check if order of the edge matches the order of the face
dir1 = va1 == (vb1+1)%len(verts1)
edge_vec1 = edge_vec if dir1 else -edge_vec
# run second face
faces2 = []
normals2 = []
for i2 in range(i1+1,e_faces):
#for i2 in range(n_faces):
if i1 == i2: continue
f2 = e.link_faces[i2]
f2.normal_update()
#edge_verts2 = [v.index for v in f2.verts if v in e.verts]
verts2 = [v.index for v in f2.verts]
va2 = verts2.index(e.verts[0].index)
vb2 = verts2.index(e.verts[1].index)
# check if order of the edge matches the order of the face
dir2 = va2 == (vb2+1)%len(verts2)
# check for normal consistency
if dir1 != dir2:
# add face
faces2.append(f2.index+1)
normals2.append(f2.normal)
else:
# add flipped face
faces2.append(-(f2.index+1))
normals2.append(-f2.normal)
# find first polyhedra (positive)
plane_x = f1.normal # normal
plane_y = plane_x.cross(edge_vec1) # tangent face perp edge
id1 = (f1.index+1)
min_angle0 = 10000
# check consistent faces
if id1 not in done:
id2 = None
min_angle = min_angle0
for i2, n2 in zip(faces2,normals2):
v2 = flatten_vector(-n2, plane_x, plane_y)
angle = vector_rotation(v2)
if angle < min_angle:
id2 = i2
min_angle = angle
if id2: done.append(id2)
new_poly = True
# add to existing polyhedron
for p in polyhedra:
if id1 in p or id2 in p:
new_poly = False
if id2 not in p: p.append(id2)
if id1 not in p: p.append(id1)
break
# start new polyhedron
if new_poly: polyhedra.append([id1, id2])
# find second polyhedra (negative)
plane_x = -f1.normal # normal
plane_y = plane_x.cross(-edge_vec1) # tangent face perp edge
id1 = -(f1.index+1)
if id1 not in done:
id2 = None
min_angle = min_angle0
for i2, n2 in zip(faces2, normals2):
v2 = flatten_vector(n2, plane_x, plane_y)
angle = vector_rotation(v2)
if angle < min_angle:
id2 = -i2
min_angle = angle
done.append(id2)
add = True
for p in polyhedra:
if id1 in p or id2 in p:
add = False
if id2 not in p: p.append(id2)
if id1 not in p: p.append(id1)
break
if add: polyhedra.append([id1, id2])
for i in range(len(bm1.faces)):
for j in (False,True):
if j: id = i+1
else: id = -(i+1)
join = []
keep = []
for p in polyhedra:
if id in p: join += p
else: keep.append(p)
if len(join) > 0:
keep.append(list(dict.fromkeys(join)))
polyhedra = keep
for i, p in enumerate(polyhedra):
for j in p:
bm1.faces[j].material_index = i
end_time = time.time()
print('Tissue: Polyhedra wireframe, found {} polyhedra in {:.4f} sec'.format(len(polyhedra), end_time-start_time))
delete_faces = []
wireframe_faces = []
not_wireframe_faces = []
flat_faces = []
bm.free()
#bmesh.ops.bisect_edges(bm1, edges=bm1.edges, cuts=3)
end_time = time.time()
print('Tissue: Polyhedra wireframe, subdivide edges in {:.4f} sec'.format(end_time-start_time))
bm1.faces.index_update()
#merge_verts = []
for p in polyhedra:
delete_faces_poly = []
wireframe_faces_poly = []
faces_id = [(f-1)*2 if f > 0 else (-f-1)*2+1 for f in p]
faces_id_neg = [(-f-1)*2 if -f > 0 else (f-1)*2+1 for f in p]
merge_verts = []
faces = [bm1.faces[f_id] for f_id in faces_id]
for f in faces:
delete = False
if f.index in delete_faces: continue
'''
cen = f.calc_center_median()
for e in f.edges:
mid = (e.verts[0].co + e.verts[1].co)/2
vec1 = e.verts[0].co - e.verts[1].co
vec2 = mid - cen
ang = Vector.angle(vec1,vec2)
length = vec2.length
#length = sin(ang)*length
if length < self.thickness/2:
delete = True
'''
if False:
sides = len(f.verts)
for i in range(sides):
v = f.verts[i].co
v0 = f.verts[(i-1)%sides].co
v1 = f.verts[(i+1)%sides].co
vec0 = v0 - v
vec1 = v1 - v
ang = (pi - vec0.angle(vec1))/2
length = min(vec0.length, vec1.length)*sin(ang)
if length < self.thickness/2:
delete = True
break
if delete:
delete_faces_poly.append(f.index)
else:
wireframe_faces_poly.append(f.index)
merge_verts += [v for v in f.verts]
if len(wireframe_faces_poly) < 2:
delete_faces += faces_id
not_wireframe_faces += faces_id_neg
else:
wireframe_faces += wireframe_faces_poly
flat_faces += delete_faces_poly
#wireframe_faces = list(dict.fromkeys(wireframe_faces))
bmesh.ops.remove_doubles(bm1, verts=merge_verts, dist=merge_dist)
bm1.edges.ensure_lookup_table()
bm1.faces.ensure_lookup_table()
bm1.faces.index_update()
wireframe_faces = [i for i in wireframe_faces if i not in not_wireframe_faces]
wireframe_faces = list(dict.fromkeys(wireframe_faces))
flat_faces = list(dict.fromkeys(flat_faces))
end_time = time.time()
print('Tissue: Polyhedra wireframe, merge and delete in {:.4f} sec'.format(end_time-start_time))
poly_me = me.copy()
bm1.to_mesh(poly_me)
poly_me.update()
new_ob = bpy.data.objects.new("Polyhedra", poly_me)
context.collection.objects.link(new_ob)
############# FRAME #############
bm1.faces.index_update()
wireframe_faces = [bm1.faces[i] for i in wireframe_faces]
original_faces = wireframe_faces
#bmesh.ops.remove_doubles(bm1, verts=merge_verts, dist=0.001)
# detect edge loops
loops = []
boundaries_mat = []
neigh_face_center = []
face_normals = []
# compute boundary frames
new_faces = []
wire_length = []
vert_ids = []
# append regular faces
for f in original_faces:
loop = list(f.verts)
loops.append(loop)
boundaries_mat.append([f.material_index for v in loop])
f.normal_update()
face_normals.append([f.normal for v in loop])
push_verts = []
inner_loops = []
for loop_index, loop in enumerate(loops):
is_boundary = loop_index < len(neigh_face_center)
materials = boundaries_mat[loop_index]
new_loop = []
loop_ext = [loop[-1]] + loop + [loop[0]]
# calc tangents
tangents = []
for i in range(len(loop)):
# vertices
vert0 = loop_ext[i]
vert = loop_ext[i+1]
vert1 = loop_ext[i+2]
# edge vectors
vec0 = (vert0.co - vert.co).normalized()
vec1 = (vert.co - vert1.co).normalized()
# tangent
_vec1 = -vec1
_vec0 = -vec0
ang = (pi - vec0.angle(vec1))/2
normal = face_normals[loop_index][i]
tan0 = normal.cross(vec0)
tan1 = normal.cross(vec1)
tangent = (tan0 + tan1).normalized()/sin(ang)*self.thickness/2
tangents.append(tangent)
# calc correct direction for boundaries
mult = -1
if is_boundary:
dir_val = 0
for i in range(len(loop)):
surf_point = neigh_face_center[loop_index][i]
tangent = tangents[i]
vert = loop_ext[i+1]
dir_val += tangent.dot(vert.co - surf_point)
if dir_val > 0: mult = 1
# add vertices
for i in range(len(loop)):
vert = loop_ext[i+1]
area = 1
new_co = vert.co + tangents[i] * mult * area
# add vertex
new_vert = bm1.verts.new(new_co)
new_loop.append(new_vert)
vert_ids.append(vert.index)
new_loop.append(new_loop[0])
# add faces
#materials += [materials[0]]
for i in range(len(loop)):
v0 = loop_ext[i+1]
v1 = loop_ext[i+2]
v2 = new_loop[i+1]
v3 = new_loop[i]
face_verts = [v1,v0,v3,v2]
if mult == -1: face_verts = [v0,v1,v2,v3]
new_face = bm1.faces.new(face_verts)
# Material by original edges
piece_id = 0
new_face.select = True
new_faces.append(new_face)
wire_length.append((v0.co - v1.co).length)
max_segment = max(wire_length)/self.subdivisions
#for f,l in zip(new_faces,wire_length):
# f.material_index = min(int(l/max_segment), self.subdivisions-1)
bm1.verts.ensure_lookup_table()
push_verts += [v.index for v in loop_ext]
# At this point topology han been build, but not yet thickened
end_time = time.time()
print('Tissue: Polyhedra wireframe, frames in {:.4f} sec'.format(end_time-start_time))
bm1.verts.ensure_lookup_table()
bm1.edges.ensure_lookup_table()
bm1.faces.ensure_lookup_table()
bm1.verts.index_update()
### Displace vertices ###
circle_center = [0]*len(bm1.verts)
circle_normal = [0]*len(bm1.verts)
smooth_corners = [True] * len(bm1.verts)
corners = [[] for i in range(len(bm1.verts))]
normals = [0]*len(bm1.verts)
vertices = [0]*len(bm1.verts)
# Define vectors direction
for f in new_faces:
v0 = f.verts[0]
v1 = f.verts[1]
id = v0.index
corners[id].append((v1.co - v0.co).normalized())
normals[id] = v0.normal.copy()
vertices[id] = v0
smooth_corners[id] = False
# Displace vertices
for i, vecs in enumerate(corners):
if len(vecs) > 0:
v = vertices[i]
nor = normals[i]
ang = 0
for vec in vecs:
ang += nor.angle(vec)
ang /= len(vecs)
div = sin(ang)
if div == 0: div = 1
v.co += nor*self.thickness/2/div
end_time = time.time()
print('Tissue: Polyhedra wireframe, corners displace in {:.4f} sec'.format(end_time-start_time))
# Removing original flat faces
flat_faces = [bm1.faces[i] for i in flat_faces]
for f in flat_faces:
f.material_index = self.subdivisions+1
for v in f.verts:
if smooth_corners[v.index]:
v.co += v.normal*self.thickness/2
smooth_corners[v.index] = False
delete_faces = delete_faces + [f.index for f in original_faces]
delete_faces = list(dict.fromkeys(delete_faces))
delete_faces = [bm1.faces[i] for i in delete_faces]
bmesh.ops.delete(bm1, geom=delete_faces, context='FACES')
bmesh.ops.remove_doubles(bm1, verts=bm1.verts, dist=merge_dist)
bm1.faces.ensure_lookup_table()
bm1.edges.ensure_lookup_table()
bm1.verts.ensure_lookup_table()
if self.dissolve_inners:
bm1.edges.index_update()
dissolve_edges = []
for f in bm1.faces:
e = f.edges[2]
if e not in dissolve_edges:
dissolve_edges.append(e)
bmesh.ops.dissolve_edges(bm1, edges=dissolve_edges, use_verts=True, use_face_split=True)
all_lines = [[] for e in me.edges]
all_end_points = [[] for e in me.edges]
for v in bm1.verts: v.select_set(False)
for f in bm1.faces: f.select_set(False)
_me = me.copy()
bm1.to_mesh(me)
me.update()
new_ob = bpy.data.objects.new("Wireframe", me)
context.collection.objects.link(new_ob)
for o in context.scene.objects: o.select_set(False)
new_ob.select_set(True)
context.view_layer.objects.active = new_ob
me = _me
bm1.free()
bpy.data.meshes.remove(_me)
#new_ob.location = ob.location
new_ob.matrix_world = ob.matrix_world
end_time = time.time()
print('Tissue: Polyhedra wireframe in {:.4f} sec'.format(end_time-start_time))
return {'FINISHED'}
|