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io_export_paper_model.py

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# -*- coding: utf-8 -*-
# ##### 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, see <http://www.gnu.org/licenses/>.
#
# ##### END GPL LICENSE BLOCK #####
#### TODO:
# sanitize the constructors so that they don't edit their parent object
# rename verts -> vertices, edge.vect -> edge.vector
# SVG object doesn't need a 'pure_net' argument in constructor
# remember selected objects before baking, except selected to active
# islands with default names should be excluded while matching
# add 'estimated number of pages' to the export UI
# profile QuickSweepline vs. BruteSweepline with/without blist: for which nets is it faster?
# rotate islands to minimize area -- and change that only if necessary to fill the page size
# Sticker.vertices should be of type Vector
# check conflicts in island naming and either:
# * append a number to the conflicting names or
# * enumerate faces uniquely within all islands of the same name (requires a check that both label and abbr. equals)
bl_info = {
"name": "Export Paper Model",
"author": "Addam Dominec",
"version": (0, 9),
"blender": (2, 70, 0),
"location": "File > Export > Paper Model",
"warning": "",
"description": "Export printable net of the active mesh",
"category": "Import-Export",
"wiki_url": "http://wiki.blender.org/index.php/Extensions:2.6/Py/"
"Scripts/Import-Export/Paper_Model",
"tracker_url": "https://developer.blender.org/T38441"
}
"""
Additional links:
e-mail: adominec {at} gmail {dot} com
"""
import bpy
import bgl
import mathutils as M
from re import compile as re_compile
from itertools import chain
from math import pi
try:
import os.path as os_path
except ImportError:
os_path = None
try:
campbellbartonUnsubmitted
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no need for try here

campbellbarton: no need for try here
from blist import blist
except ImportError:
blist = list
campbellbartonUnsubmitted
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whats blist ?

campbellbarton: whats `blist` ?
emuAuthorUnsubmitted
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a type similar to list, implemented using a search tree. It can insert at any position in O(log n). https://pypi.python.org/pypi/blist/1.3.4

emu: a type similar to list, implemented using a search tree. It can insert at any position in O(log…
default_priority_effect = {
'CONVEX': 0.5,
'CONCAVE': 1,
'LENGTH': -0.05
}
def first_letters(text):
"""Iterator over the first letter of each word"""
for match in first_letters.pattern.finditer(text):
yield text[match.start()]
campbellbartonUnsubmitted
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this could be a regular function

campbellbarton: this could be a regular function
first_letters.pattern = re_compile("(?<!\w)[\w]")
def pairs(sequence):
"""Generate consecutive pairs throughout the given sequence; at last, it gives elements last, first."""
i = iter(sequence)
previous = first = next(i)
for this in i:
yield previous, this
previous = this
yield this, first
def argmax_pair(array, key):
"""Find an (unordered) pair of indices that maximize the given function"""
l = len(array)
mi, mj, m = None, None, None
for i in range(l):
for j in range(i+1, l):
k = key(array[i], array[j])
if not m or k > m:
mi, mj, m = i, j, k
return mi, mj
def fitting_matrix(v1, v2):
"""Get a matrix that rotates v1 to the same direction as v2"""
return (1 / v1.length_squared) * M.Matrix((
(v1.x*v2.x + v1.y*v2.y, v1.y*v2.x - v1.x*v2.y),
(v1.x*v2.y - v1.y*v2.x, v1.x*v2.x + v1.y*v2.y)))
def z_up_matrix(n):
campbellbartonUnsubmitted
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our API should be able to do this.

campbellbarton: our API should be able to do this.
emuAuthorUnsubmitted
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sure, as v1.to_3d().cross(v2.to_3d()).z
I did some profiling and this appears to be faster. It is one of the most often called functions in the script.

emu: sure, as v1.to_3d().cross(v2.to_3d()).z I did some profiling and this appears to be faster. It…
campbellbartonUnsubmitted
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Update, v1.cross(v2) now works for 2d vectors.

https://developer.blender.org/rB06b6cd83459713ef5c00f705f6cdf1481ed24179

campbellbarton: Update, v1.cross(v2) now works for 2d vectors. https://developer.blender.
"""Get a rotation matrix that aligns given vector upwards."""
b = n.xy.length
l = n.length
if b > 0:
return M.Matrix((
(n.x*n.z/(b*l), n.y*n.z/(b*l), -b/l),
(-n.y/b, n.x/b, 0),
(0, 0, 0)
))
else:
# no need for rotation
return M.Matrix((
(1, 0, 0),
(0, (-1 if n.z < 0 else 1), 0),
(0, 0, 0)
))
def create_blank_image(image_name, dimensions, alpha=1):
"""Create a new image and assign white color to all its pixels"""
image_name = image_name[:64]
width, height = int(dimensions.x), int(dimensions.y)
image = bpy.data.images.new(image_name, width, height, alpha=True)
if image.users > 0:
raise UnfoldError("There is something wrong with the material of the model. "
"Please report this on the BlenderArtists forum. Export failed.")
image.pixels = [1, 1, 1, alpha] * (width * height)
image.file_format = 'PNG'
return image
class UnfoldError(ValueError):
pass
class Unfolder:
def __init__(self, ob):
self.ob = ob
self.mesh = Mesh(ob.data, ob.matrix_world)
self.tex = None
def prepare(self, cage_size=None, create_uvmap=False, mark_seams=False, priority_effect=default_priority_effect, scale=1):
"""Create the islands of the net"""
self.mesh.generate_cuts(cage_size / scale if cage_size else None, priority_effect)
self.mesh.finalize_islands()
campbellbartonUnsubmitted
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image names can be up to 64 characters now, does this size need updating?

campbellbarton: image names can be up to 64 characters now, does this size need updating?
self.mesh.enumerate_islands()
if create_uvmap:
self.tex = self.mesh.save_uv()
if mark_seams:
self.mesh.mark_cuts()
def copy_island_names(self, island_list):
"""Copy island label and abbreviation from the best matching island in the list"""
orig_list = {(frozenset(face.id for face in item.faces), item.label, item.abbreviation) for item in island_list}
for island in self.mesh.islands:
islfaces = {uvface.face.index for uvface in island.faces}
match = max(orig_list, key=lambda item: islfaces.intersection(item[0]))
island.label = match[1]
island.abbreviation = match[2]
campbellbartonUnsubmitted
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Best use pythons tempfile - http://docs.python.org/3/library/tempfile.html

campbellbarton: Best use pythons `tempfile` - http://docs.python.org/3/library/tempfile.html
def save(self, properties):
"""Export the document"""
# Note about scale: input is direcly in blender length
# Island.apply_scale multiplies everything by a user-defined ratio
# SVG object multiplies everything by ppm (output in pixels)
filepath = properties.filepath
if filepath.lower().endswith((".svg", ".png")):
filepath = filepath[0:-4]
# page size in meters
page_size = M.Vector((properties.output_size_x, properties.output_size_y))
# printable area size in meters
printable_size = page_size - 2 * properties.output_margin * M.Vector((1, 1))
unit_scale = bpy.context.scene.unit_settings.scale_length
ppm = properties.output_dpi * 100 / 2.54 # pixels per meter
# after this call, all dimensions will be in meters
self.mesh.scale_islands(unit_scale/properties.scale)
if properties.do_create_stickers:
self.mesh.generate_stickers(properties.sticker_width, properties.do_create_numbers)
elif properties.do_create_numbers:
self.mesh.generate_numbers_alone(properties.sticker_width)
text_height = properties.sticker_width if (properties.do_create_numbers and len(self.mesh.islands) > 1) else 0
aspect_ratio = printable_size.x / printable_size.y
# finalizing islands will scale everything so that the page height is 1
self.mesh.finalize_islands(title_height=text_height)
self.mesh.fit_islands(cage_size=printable_size)
if properties.output_type != 'NONE':
# bake an image and save it as a PNG to disk or into memory
use_separate_images = properties.image_packing in ('ISLAND_LINK', 'ISLAND_EMBED')
tex = self.mesh.save_uv(cage_size=printable_size, separate_image=use_separate_images, tex=self.tex)
if not tex:
raise UnfoldError("The mesh has no UV Map slots left. Either delete a UV Map or export the net without textures.")
if properties.output_type == 'TEXTURE' and tex.active_render:
tex.active = True
bpy.ops.mesh.uv_texture_remove()
raise UnfoldError("Texture bake error. Probably a UV Map is missing.")
rd = bpy.context.scene.render
recall = rd.bake_type, rd.use_bake_to_vertex_color, rd.use_bake_selected_to_active, rd.bake_distance, rd.bake_bias, rd.bake_margin, rd.use_bake_clear
campbellbartonUnsubmitted
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prefer filepath.lower().endswith((".svg", ".png"))

campbellbarton: prefer `filepath.lower().endswith((".svg", ".png"))`
if properties.output_type == 'RENDER':
rd.bake_type = 'FULL'
rd.use_bake_selected_to_active = False
elif properties.output_type == 'TEXTURE':
rd.bake_type = 'TEXTURE'
rd.use_bake_selected_to_active = False
recall_materials = [slot.material for slot in self.ob.material_slots]
mat = bpy.data.materials.new("unfolder_temp")
mat.use_shadeless = True
mat.use_face_texture = True
for slot in self.ob.material_slots:
slot.material = mat
if not recall_materials:
# this is a crazy hack. Sometimes, slots must be accessed
# through ob.material_slots, sometimes ob.data.materials
self.ob.data.materials.append(mat)
elif properties.output_type == 'SELECTED_TO_ACTIVE':
rd.bake_type = 'FULL'
rd.use_bake_selected_to_active = True
rd.bake_margin, rd.bake_distance, rd.bake_bias, rd.use_bake_to_vertex_color, rd.use_bake_clear = 0, 0, 0.001, False, False
if properties.image_packing == 'PAGE_LINK':
self.mesh.save_image(tex, printable_size * ppm, filepath)
elif properties.image_packing == 'ISLAND_LINK':
self.mesh.save_separate_images(tex, printable_size.y * ppm, filepath)
elif properties.image_packing == 'ISLAND_EMBED':
self.mesh.save_separate_images(tex, printable_size.y * ppm, filepath, do_embed=True)
# revoke settings
rd.bake_type, rd.use_bake_to_vertex_color, rd.use_bake_selected_to_active, rd.bake_distance, rd.bake_bias, rd.bake_margin, rd.use_bake_clear = recall
if properties.output_type == 'TEXTURE':
for slot, material in zip(self.ob.material_slots, recall_materials):
slot.material = material
if not recall_materials:
# another crazy workaround, remove the material slot we have created
self.ob.data.materials.pop()
mat.user_clear()
bpy.data.materials.remove(mat)
if not properties.do_create_uvmap:
tex.active = True
bpy.ops.mesh.uv_texture_remove()
svg = SVG(page_size, ppm, properties.style, (properties.output_type == 'NONE'))
svg.do_create_stickers = properties.do_create_stickers
svg.margin = properties.output_margin
svg.text_size = properties.sticker_width
svg.write(self.mesh, filepath)
class Mesh:
"""Wrapper for Bpy Mesh"""
def __init__(self, mesh, matrix):
self.verts = dict()
self.edges = dict()
self.edges_by_verts_indices = dict()
self.faces = dict()
self.islands = list()
self.data = mesh
self.pages = list()
for bpy_vertex in mesh.vertices:
self.verts[bpy_vertex.index] = Vertex(bpy_vertex, matrix)
for bpy_edge in mesh.edges:
edge = Edge(bpy_edge, self, matrix)
self.edges[bpy_edge.index] = edge
self.edges_by_verts_indices[(edge.va.index, edge.vb.index)] = edge
self.edges_by_verts_indices[(edge.vb.index, edge.va.index)] = edge
for bpy_face in mesh.polygons:
face = Face(bpy_face, self)
self.faces[bpy_face.index] = face
for index in self.edges:
edge = self.edges[index]
edge.choose_main_faces()
if edge.main_faces:
edge.calculate_angle()
def generate_cuts(self, page_size, priority_effect):
"""Cut the mesh so that it can be unfolded to a flat net."""
# warning: this constructor modifies its parameter (face)
islands = {Island(face) for face in self.faces.values()}
# check for edges that are cut permanently
edges = [edge for edge in self.edges.values() if not edge.force_cut and len(edge.faces) > 1]
if edges:
average_length = sum(edge.length for edge in edges) / len(edges)
for edge in edges:
edge.generate_priority(priority_effect, average_length)
edges.sort(reverse=False, key=lambda edge: edge.priority)
for edge in edges:
if edge.length == 0:
continue
face_a, face_b = edge.main_faces
island_a, island_b = face_a.uvface.island, face_b.uvface.island
if island_a is not island_b:
if len(island_b.faces) > len(island_a.faces):
island_a, island_b = island_b, island_a
if island_a.join(island_b, edge, size_limit=page_size):
islands.remove(island_b)
self.islands = sorted(islands, reverse=True, key=lambda island: len(island.faces))
for edge in self.edges.values():
# some edges did not know until now whether their angle is convex or concave
if edge.main_faces and (edge.main_faces[0].uvface.flipped or edge.main_faces[1].uvface.flipped):
edge.calculate_angle()
# ensure that the order of faces corresponds to the order of uvedges
if len(edge.uvedges) >= 2:
reordered = [None, None]
for uvedge in edge.uvedges:
try:
index = edge.main_faces.index(uvedge.uvface.face)
reordered[index] = uvedge
except ValueError:
reordered.append(uvedge)
edge.uvedges = reordered
for island in self.islands:
# if the normals are ambiguous, flip them so that there are more convex edges than concave ones
if any(uvface.flipped for uvface in island.faces):
island_edges = {uvedge.edge for uvedge in island.edges if not uvedge.edge.is_cut(uvedge.uvface.face)}
balance = sum((+1 if edge.angle > 0 else -1) for edge in island_edges)
if balance < 0:
island.is_inside_out = True
# construct a linked list from each island's boundary
# uvedge.neighbor_right is clockwise = forward = via uvedge.vb if not uvface.flipped
neighbor_lookup, conflicts = dict(), dict()
for uvedge in island.boundary:
uvvertex = uvedge.va if uvedge.uvface.flipped else uvedge.vb
if uvvertex not in neighbor_lookup:
neighbor_lookup[uvvertex] = uvedge
else:
if uvvertex not in conflicts:
conflicts[uvvertex] = [neighbor_lookup[uvvertex], uvedge]
else:
conflicts[uvvertex].append(uvedge)
for uvedge in island.boundary:
uvvertex = uvedge.vb if uvedge.uvface.flipped else uvedge.va
if uvvertex not in conflicts:
# using the 'get' method so as to handle single-connected vertices properly
uvedge.neighbor_right = neighbor_lookup.get(uvvertex, uvedge)
uvedge.neighbor_right.neighbor_left = uvedge
else:
conflicts[uvvertex].append(uvedge)
# resolve merged vertices with more boundaries crossing
def direction_to_float(vector):
return (1 - vector.x/vector.length) if vector.y > 0 else (vector.x/vector.length - 1)
for uvvertex, uvedges in conflicts.items():
def is_inwards(uvedge):
return uvedge.uvface.flipped == (uvedge.va is uvvertex)
def uvedge_sortkey(uvedge):
if is_inwards(uvedge):
return direction_to_float(uvedge.va.co - uvedge.vb.co)
else:
return direction_to_float(uvedge.vb.co - uvedge.va.co)
uvedges.sort(key=uvedge_sortkey)
for right, left in zip(uvedges[:-1:2], uvedges[1::2]) if is_inwards(uvedges[0]) else zip([uvedges[-1]] + uvedges[1::2], uvedges[:-1:2]):
left.neighbor_right = right
right.neighbor_left = left
return True
def mark_cuts(self):
"""Mark cut edges in the original mesh so that the user can see"""
for bpy_edge in self.data.edges:
edge = self.edges[bpy_edge.index]
bpy_edge.use_seam = len(edge.uvedges) > 1 and edge.is_main_cut
def generate_stickers(self, default_width, do_create_numbers=True):
"""Add sticker faces where they are needed."""
def uvedge_priority(uvedge):
"""Retuns whether it is a good idea to stick something on this edge's face"""
# TODO: it should take into account overlaps with faces and with other stickers
return uvedge.uvface.face.area / sum((vb.co - va.co).length for (va, vb) in pairs(uvedge.uvface.verts))
def add_sticker(uvedge, index, target_island):
uvedge.sticker = Sticker(uvedge, default_width, index, target_island)
uvedge.island.add_marker(uvedge.sticker)
for edge in self.edges.values():
if edge.is_main_cut and len(edge.uvedges) >= 2:
uvedge_a, uvedge_b = edge.uvedges[:2]
if uvedge_priority(uvedge_a) < uvedge_priority(uvedge_b):
uvedge_a, uvedge_b = uvedge_b, uvedge_a
target_island = uvedge_a.island
left_edge, right_edge = uvedge_a.neighbor_left.edge, uvedge_a.neighbor_right.edge
if do_create_numbers:
for uvedge in [uvedge_b] + edge.uvedges[2:]:
if ((uvedge.neighbor_left.edge is not right_edge or uvedge.neighbor_right.edge is not left_edge) and
uvedge not in (uvedge_a.neighbor_left, uvedge_a.neighbor_right)):
# it will not be clear to see that these uvedges should be sticked together
# So, create an arrow and put the index on all stickers
target_island.sticker_numbering += 1
index = str(target_island.sticker_numbering)
# if the index would have a different meaning upside down, append a dot
if {'6', '9'} < set(index) < {'6', '8', '9', '0'}:
index += "."
target_island.add_marker(Arrow(uvedge_a, default_width, index))
break
else:
# if all uvedges to be sticked are easy to see, create no numbers
index = None
else:
index = None
add_sticker(uvedge_b, index, target_island)
elif len(edge.uvedges) > 2:
index = None
target_island = edge.uvedges[0].island
if len(edge.uvedges) > 2:
for uvedge in edge.uvedges[2:]:
add_sticker(uvedge, index, target_island)
def generate_numbers_alone(self, size):
global_numbering = 0
for edge in self.edges.values():
if edge.is_main_cut and len(edge.uvedges) >= 2:
global_numbering += 1
index = str(global_numbering)
if ('6' in index or '9' in index) and set(index) <= {'6', '8', '9', '0'}:
# if index consists of the digits 6, 8, 9, 0 only and contains 6 or 9, make it distinguishable
index += "."
for uvedge in edge.uvedges:
uvedge.island.add_marker(NumberAlone(uvedge, index, size))
def enumerate_islands(self):
for num, island in enumerate(self.islands, 1):
island.number = num
island.generate_label()
def scale_islands(self, scale):
for island in self.islands:
for point in chain((vertex.co for vertex in island.verts), island.fake_verts):
point *= scale
def finalize_islands(self, title_height=0):
for island in self.islands:
if title_height:
island.title = "[{}] {}".format(island.abbreviation, island.label)
points = list(vertex.co for vertex in island.verts) + island.fake_verts
angle = M.geometry.box_fit_2d(points)
rot = M.Matrix.Rotation(angle, 2)
for point in points:
# note: we need an in-place operation, and Vector.rotate() seems to work for 3d vectors only
point[:] = rot * point
for marker in island.markers:
marker.rot = rot * marker.rot
bottom_left = M.Vector((min(v.x for v in points), min(v.y for v in points) - title_height))
for point in points:
point -= bottom_left
island.bounding_box = M.Vector((max(v.x for v in points), max(v.y for v in points)))
def largest_island_ratio(self, page_size):
return max(max(island.bounding_box.x / page_size.x, island.bounding_box.y / page_size.y) for island in self.islands)
def fit_islands(self, cage_size):
"""Move islands so that they fit onto pages, based on their bounding boxes"""
def try_emplace(island, page_islands, cage_size, stops_x, stops_y, occupied_cache):
"""Tries to put island to each pair from stops_x, stops_y
and checks if it overlaps with any islands present on the page.
Returns True and positions the given island on success."""
bbox_x, bbox_y = island.bounding_box.xy
for x in stops_x:
if x + bbox_x > cage_size.x:
continue
for y in stops_y:
if y + bbox_y > cage_size.y or (x, y) in occupied_cache:
continue
for i, obstacle in enumerate(page_islands):
# if this obstacle overlaps with the island, try another stop
if (x + bbox_x > obstacle.pos.x and
obstacle.pos.x + obstacle.bounding_box.x > x and
y + bbox_y > obstacle.pos.y and
obstacle.pos.y + obstacle.bounding_box.y > y):
if x >= obstacle.pos.x and y >= obstacle.pos.y:
occupied_cache.add((x, y))
# just a stupid heuristic to make subsequent searches faster
if i > 0:
page_islands[1:i+1] = page_islands[:i]
page_islands[0] = obstacle
break
else:
# if no obstacle called break, this position is okay
island.pos.xy = x, y
page_islands.append(island)
stops_x.append(x + bbox_x)
stops_y.append(y + bbox_y)
return True
return False
def drop_portion(stops, border, divisor):
stops.sort()
# distance from left neighbor to the right one, excluding the first stop
distances = [right - left for left, right in zip(stops, chain(stops[2:], [border]))]
quantile = sorted(distances)[len(distances) // divisor]
return [stop for stop, distance in zip(stops, chain([quantile], distances)) if distance >= quantile]
if any(island.bounding_box.x > cage_size.x or island.bounding_box.y > cage_size.y for island in self.islands):
raise UnfoldError("An island is too big to fit onto page of the given size. "
"Either downscale the model or find and split that island manually.\n"
"Export failed, sorry.")
# sort islands by their diagonal... just a guess
remaining_islands = sorted(self.islands, reverse=True, key=lambda island: island.bounding_box.length_squared)
page_num = 1
while remaining_islands:
# create a new page and try to fit as many islands onto it as possible
page = Page(page_num)
page_num += 1
occupied_cache = set()
stops_x, stops_y = [0], [0]
for island in remaining_islands:
try_emplace(island, page.islands, cage_size, stops_x, stops_y, occupied_cache)
# if overwhelmed with stops, drop a quarter of them
if len(stops_x)**2 > 4 * len(self.islands) + 100:
stops_x = drop_portion(stops_x, cage_size.x, 4)
stops_y = drop_portion(stops_y, cage_size.y, 4)
remaining_islands = [island for island in remaining_islands if island not in page.islands]
self.pages.append(page)
def save_uv(self, cage_size=M.Vector((1, 1)), separate_image=False, tex=None):
# TODO: mode switching should be handled by higher-level code
bpy.ops.object.mode_set()
# note: assuming that the active object's data is self.mesh
if not tex:
tex = self.data.uv_textures.new()
if not tex:
return None
tex.name = "Unfolded"
tex.active = True
# TODO: this is somewhat dirty, but I do not see a nicer way in the API
loop = self.data.uv_layers[self.data.uv_layers.active_index]
if separate_image:
for island in self.islands:
island.save_uv_separate(loop)
else:
for island in self.islands:
island.save_uv(loop, cage_size)
return tex
def save_image(self, tex, page_size_pixels: M.Vector, filename):
texfaces = tex.data
# omitting this causes a "Circular reference in texture stack" error
for island in self.islands:
for uvface in island.faces:
texfaces[uvface.face.index].image = None
for page in self.pages:
image = create_blank_image("{} {} Unfolded".format(self.data.name[:14], page.name), page_size_pixels, alpha=1)
image.filepath_raw = page.image_path = "{}_{}.png".format(filename, page.name)
for island in page.islands:
for uvface in island.faces:
texfaces[uvface.face.index].image = image
try:
bpy.ops.object.bake_image()
image.save()
finally:
for island in page.islands:
for uvface in island.faces:
texfaces[uvface.face.index].image = None
image.user_clear()
bpy.data.images.remove(image)
def save_separate_images(self, tex, scale, filepath, do_embed=False):
assert(os_path) # check the module was imported
if do_embed:
import tempfile
import base64
else:
from os import mkdir
image_dir = filepath
try:
mkdir(image_dir)
except OSError:
# image_dir already existed
pass
texfaces = tex.data
# omitting these 3 lines causes a "Circular reference in texture stack" error
for island in self.islands:
for uvface in island.faces:
texfaces[uvface.face.index].image = None
for i, island in enumerate(self.islands, 1):
if do_embed:
tempfile_manager = tempfile.NamedTemporaryFile("rb", suffix=".png")
image_path = tempfile_manager.name
image_name = os_path.basename(tempfile_manager.name)
# note: image_path exists by now and Blender will overwrite it;
# we will read later from the same file
else:
image_path = os_path.join(image_dir, "island{}.png".format(i))
image_name = "{} isl{}".format(self.data.name[:15], i)
image = create_blank_image(image_name, island.bounding_box * scale, alpha=0)
image.filepath_raw = image_path
for uvface in island.faces:
texfaces[uvface.face.index].image = image
try:
bpy.ops.object.bake_image()
image.save()
finally:
for uvface in island.faces:
texfaces[uvface.face.index].image = None
image.user_clear()
bpy.data.images.remove(image)
if do_embed:
with tempfile_manager as imgfile:
island.embedded_image = base64.encodebytes(imgfile.read()).decode('ascii')
else:
island.image_path = image_path
class Vertex:
"""BPy Vertex wrapper"""
__slots__ = ('index', 'co', 'edges', 'uvs')
def __init__(self, bpy_vertex, matrix):
self.index = bpy_vertex.index
self.co = matrix * bpy_vertex.co
self.edges = list()
self.uvs = list()
def __hash__(self):
return hash(self.index)
def __eq__(self, other):
return self.index == other.index
class Edge:
"""Wrapper for BPy Edge"""
__slots__ = ('va', 'vb', 'faces', 'main_faces', 'uvedges',
'vect', 'length', 'angle',
'is_main_cut', 'force_cut', 'priority')
def __init__(self, edge, mesh, matrix=1):
self.va = mesh.verts[edge.vertices[0]]
self.vb = mesh.verts[edge.vertices[1]]
self.vect = self.vb.co - self.va.co
self.length = self.vect.length
self.faces = list()
# if self.main_faces is set, then self.uvedges[:2] must correspond to self.main_faces, in their order
# this constraint is assured at the time of finishing mesh.generate_cuts
self.uvedges = list()
self.force_cut = bool(edge.use_seam) # such edges will always be cut
self.main_faces = None # two faces that may be connected in the island
# is_main_cut defines whether the two main faces are connected
# all the others will be assumed to be cut
self.is_main_cut = True
self.priority = None
self.angle = None
self.va.edges.append(self) #FIXME: editing foreign attribute
self.vb.edges.append(self) #FIXME: editing foreign attribute
def choose_main_faces(self):
"""Choose two main faces that might get connected in an island"""
if len(self.faces) == 2:
self.main_faces = self.faces
elif len(self.faces) > 2:
# find (with brute force) the pair of indices whose faces have the most similar normals
i, j = argmax_pair(self.faces, key=lambda a, b: abs(a.normal.dot(b.normal)))
self.main_faces = [self.faces[i], self.faces[j]]
def calculate_angle(self):
"""Calculate the angle between the main faces"""
face_a, face_b = self.main_faces
if face_a.normal.length_squared == 0 or face_b.normal.length_squared == 0:
self.angle = -3 # just a very sharp angle
return
# correction if normals are flipped
a_is_clockwise = ((face_a.verts.index(self.va) - face_a.verts.index(self.vb)) % len(face_a.verts) == 1)
b_is_clockwise = ((face_b.verts.index(self.va) - face_b.verts.index(self.vb)) % len(face_b.verts) == 1)
is_equal_flip = True
if face_a.uvface and face_b.uvface:
a_is_clockwise ^= face_a.uvface.flipped
b_is_clockwise ^= face_b.uvface.flipped
is_equal_flip = (face_a.uvface.flipped == face_b.uvface.flipped)
# TODO: maybe this need not be true in _really_ ugly cases: assert(a_is_clockwise != b_is_clockwise)
if a_is_clockwise != b_is_clockwise:
if (a_is_clockwise == (face_b.normal.cross(face_a.normal).dot(self.vect) > 0)) == is_equal_flip:
# the angle is convex
self.angle = face_a.normal.angle(face_b.normal)
else:
# the angle is concave
self.angle = -face_a.normal.angle(face_b.normal)
else:
# normals are flipped, so we know nothing
# so let us assume the angle be convex
self.angle = face_a.normal.angle(-face_b.normal)
def generate_priority(self, priority_effect, average_length):
"""Calculate the priority value for cutting"""
angle = self.angle
if angle > 0:
self.priority = priority_effect['CONVEX'] * angle / pi
else:
self.priority = priority_effect['CONCAVE'] * (-angle) / pi
self.priority += (self.length / average_length) * priority_effect['LENGTH']
def is_cut(self, face):
"""Return False if this edge will the given face to another one in the resulting net
(useful for edges with more than two faces connected)"""
# Return whether there is a cut between the two main faces
if self.main_faces and face in self.main_faces:
return self.is_main_cut
# All other faces (third and more) are automatically treated as cut
else:
return True
def other_uvedge(self, this):
"""Get an uvedge of this edge that is not the given one
causes an IndexError if case of less than two adjacent edges"""
return self.uvedges[1] if this is self.uvedges[0] else self.uvedges[0]
class Face:
"""Wrapper for BPy Face"""
__slots__ = ('index', 'edges', 'verts', 'uvface',
'loop_start', 'area', 'normal')
def __init__(self, bpy_face, mesh, matrix=1):
self.index = bpy_face.index
self.edges = list()
self.verts = [mesh.verts[i] for i in bpy_face.vertices]
self.loop_start = bpy_face.loop_start
self.area = bpy_face.area
self.uvface = None
# calculate the face normal explicitly
if len(self.verts) == 3:
# normal of a triangle can be calculated directly
self.normal = (self.verts[1].co - self.verts[0].co).cross(self.verts[2].co - self.verts[0].co).normalized()
else:
# Newell's method
nor = M.Vector((0, 0, 0))
for a, b in pairs(self.verts):
p, m = a.co + b.co, a.co - b.co
nor.x, nor.y, nor.z = nor.x + m.y*p.z, nor.y + m.z*p.x, nor.z + m.x*p.y
self.normal = nor.normalized()
for verts_indices in bpy_face.edge_keys:
edge = mesh.edges_by_verts_indices[verts_indices]
self.edges.append(edge)
edge.faces.append(self) #FIXME: editing foreign attribute
def is_twisted(self):
if len(self.verts) > 3:
center = sum(vertex.co for vertex in self.verts) / len(self.verts)
plane_d = center.dot(self.normal)
diameter = max((center - vertex.co).length for vertex in self.verts)
for vertex in self.verts:
# check coplanarity
if abs(vertex.co.dot(self.normal) - plane_d) > diameter * 0.01:
return True
return False
def __hash__(self):
return hash(self.index)
class Island:
"""Part of the net to be exported"""
__slots__ = ('faces', 'edges', 'verts', 'fake_verts', 'uvverts_by_id', 'boundary', 'markers',
'pos', 'bounding_box',
'image_path', 'embedded_image',
'number', 'label', 'abbreviation', 'title',
'has_safe_geometry', 'is_inside_out',
'sticker_numbering')
def __init__(self, face=None):
"""Create an Island from a single Face"""
self.faces = list()
self.edges = set()
self.verts = set()
self.fake_verts = list()
self.markers = list()
self.label = None
self.abbreviation = None
self.title = None
self.pos = M.Vector((0, 0))
self.image_path = None
self.embedded_image = None
self.is_inside_out = False # swaps concave <-> convex edges
self.has_safe_geometry = True
self.sticker_numbering = 0
if face:
uvface = UVFace(face, self)
self.verts.update(uvface.verts)
self.edges.update(uvface.edges)
self.faces.append(uvface)
# speedup for Island.join
self.uvverts_by_id = {uvvertex.vertex.index: [uvvertex] for uvvertex in self.verts}
# UVEdges on the boundary
self.boundary = list(self.edges)
def join(self, other, edge: Edge, size_limit=None, epsilon=1e-6) -> bool:
"""
Try to join other island on given edge
Returns False if they would overlap
"""
class Intersection(Exception):
pass
class GeometryError(Exception):
pass
def is_below(self, other, correct_geometry=True):
if self is other:
return False
if self.top < other.bottom:
return True
if other.top < self.bottom:
return False
if self.max.tup <= other.min.tup:
return True
if other.max.tup <= self.min.tup:
return False
self_vector = self.max.co - self.min.co
min_to_min = other.min.co - self.min.co
cross_b1 = self_vector.cross(min_to_min)
cross_b2 = self_vector.cross(other.max.co - self.min.co)
if cross_b2 < cross_b1:
cross_b1, cross_b2 = cross_b2, cross_b1
if cross_b2 > 0 and (cross_b1 > 0 or (cross_b1 == 0 and not self.is_uvface_upwards())):
return True
if cross_b1 < 0 and (cross_b2 < 0 or (cross_b2 == 0 and self.is_uvface_upwards())):
return False
other_vector = other.max.co - other.min.co
cross_a1 = other_vector.cross(-min_to_min)
cross_a2 = other_vector.cross(self.max.co - other.min.co)
if cross_a2 < cross_a1:
cross_a1, cross_a2 = cross_a2, cross_a1
if cross_a2 > 0 and (cross_a1 > 0 or (cross_a1 == 0 and not other.is_uvface_upwards())):
return False
if cross_a1 < 0 and (cross_a2 < 0 or (cross_a2 == 0 and other.is_uvface_upwards())):
return True
if cross_a1 == cross_b1 == cross_a2 == cross_b2 == 0:
if correct_geometry:
raise GeometryError
elif self.is_uvface_upwards() == other.is_uvface_upwards():
raise Intersection
return False
if self.min.tup == other.min.tup or self.max.tup == other.max.tup:
return cross_a2 > cross_b2
raise Intersection
class QuickSweepline:
"""Efficient sweepline based on binary search, checking neighbors only"""
def __init__(self):
self.children = blist()
def add(self, item, cmp=is_below):
low, high = 0, len(self.children)
while low < high:
mid = (low + high) // 2
if cmp(self.children[mid], item):
low = mid + 1
else:
high = mid
self.children.insert(low, item)
def remove(self, item, cmp=is_below):
index = self.children.index(item)
self.children.pop(index)
if index > 0 and index < len(self.children):
# check for intersection
if cmp(self.children[index], self.children[index-1]):
raise GeometryError
class BruteSweepline:
"""Safe sweepline which checks all its members pairwise"""
def __init__(self):
self.children = set()
self.last_min = None, []
self.last_max = None, []
def add(self, item, cmp=is_below):
for child in self.children:
if child.min is not item.min and child.max is not item.max:
cmp(item, child, False)
self.children.add(item)
def remove(self, item):
self.children.remove(item)
def sweep(sweepline, segments):
"""Sweep across the segments and raise an exception if necessary"""
# careful, 'segments' may be a use-once iterator
events_add = sorted(segments, reverse=True, key=lambda uvedge: uvedge.min.tup)
events_remove = sorted(events_add, reverse=True, key=lambda uvedge: uvedge.max.tup)
while events_remove:
while events_add and events_add[-1].min.tup <= events_remove[-1].max.tup:
sweepline.add(events_add.pop())
sweepline.remove(events_remove.pop())
def root_find(value, tree):
"""Find the root of a given value in a forest-like dictionary
also updates the dictionary using path compression"""
parent, relink = tree.get(value), list()
while parent is not None:
relink.append(value)
value, parent = parent, tree.get(parent)
tree.update(dict.fromkeys(relink, value))
return value
def slope_from(position):
def slope(uvedge):
vec = (uvedge.vb.co - uvedge.va.co) if uvedge.va.tup == position else (uvedge.va.co - uvedge.vb.co)
return (vec.y / vec.length + 1) if ((vec.x, vec.y) > (0, 0)) else (-1 - vec.y / vec.length)
return slope
# find edge in other and in self
for uvedge in edge.uvedges:
if uvedge.uvface.face in uvedge.edge.main_faces:
if uvedge.uvface.island is self and uvedge in self.boundary:
uvedge_a = uvedge
elif uvedge.uvface.island is other and uvedge in other.boundary:
uvedge_b = uvedge
else:
return False
# check if vertices and normals are aligned correctly
verts_flipped = uvedge_b.va.vertex is uvedge_a.va.vertex
flipped = verts_flipped ^ uvedge_a.uvface.flipped ^ uvedge_b.uvface.flipped
# determine rotation
# NOTE: if the edges differ in length, the matrix will involve uniform scaling.
# Such situation may occur in the case of twisted n-gons
first_b, second_b = (uvedge_b.va, uvedge_b.vb) if not verts_flipped else (uvedge_b.vb, uvedge_b.va)
if not flipped:
rot = fitting_matrix(first_b.co - second_b.co, uvedge_a.vb.co - uvedge_a.va.co)
else:
flip = M.Matrix(((-1, 0), (0, 1)))
rot = fitting_matrix(flip * (first_b.co - second_b.co), uvedge_a.vb.co - uvedge_a.va.co) * flip
trans = uvedge_a.vb.co - rot * first_b.co
# extract and transform island_b's boundary
phantoms = {uvvertex: UVVertex(rot*uvvertex.co + trans, uvvertex.vertex) for uvvertex in other.verts}
# check the size of the resulting island
if size_limit:
# first check: bounding box
bbox_width = max(max(seg.max.co.x for seg in self.boundary), max(vertex.co.x for vertex in phantoms)) - min(min(seg.min.co.x for seg in self.boundary), min(vertex.co.x for vertex in phantoms))
bbox_height = max(max(seg.top for seg in self.boundary), max(vertex.co.y for vertex in phantoms)) - min(min(seg.bottom for seg in self.boundary), min(vertex.co.y for vertex in phantoms))
if min(bbox_width, bbox_height)**2 > size_limit.x**2 + size_limit.y**2:
return False
if (bbox_width > size_limit.x or bbox_height > size_limit.y) and (bbox_height > size_limit.x or bbox_width > size_limit.y):
# further checks (TODO!)
# for the time being, just throw this piece away
return False
distance_limit = edge.vect.length_squared * epsilon
# try and merge UVVertices closer than sqrt(distance_limit)
merged_uvedges = set()
merged_uvedge_pairs = list()
# merge all uvvertices that are close enough using a union-find structure
# uvvertices will be merged only in cases other->self and self->self
# all resulting groups are merged together to a uvvertex of self
is_merged_mine = False
shared_vertices = self.uvverts_by_id.keys() & other.uvverts_by_id.keys()
for vertex_id in shared_vertices:
uvs = self.uvverts_by_id[vertex_id] + other.uvverts_by_id[vertex_id]
len_mine = len(self.uvverts_by_id[vertex_id])
merged = dict()
for i, a in enumerate(uvs[:len_mine]):
i = root_find(i, merged)
for j, b in enumerate(uvs[i+1:], i+1):
b = b if j < len_mine else phantoms[b]
j = root_find(j, merged)
if i == j:
campbellbartonUnsubmitted
Not Done
Inline Actions

Much more efficient to simply do present.clear()

campbellbarton: Much more efficient to simply do `present.clear()`
emuAuthorUnsubmitted
Not Done
Inline Actions

I don't think that would work. There may be other unrelated items in the list present. Each vertex may have many instances in the flat net.
This code really needs to make sure that source is not in present, and that target is.

emu: I don't think that would work. There may be other unrelated items in the list `present`. Each…
continue
i, j = (j, i) if j < i else (i, j)
if (a.co - b.co).length_squared < distance_limit:
merged[j] = i
for source, target in merged.items():
target = root_find(target, merged)
phantoms[uvs[source]] = uvs[target]
is_merged_mine |= (source < len_mine) # remember that a vertex of this island has been merged
for uvedge in (chain(self.boundary, other.boundary) if is_merged_mine else other.boundary):
for partner in uvedge.edge.uvedges:
if partner is not uvedge:
paired_a, paired_b = phantoms.get(partner.vb, partner.vb), phantoms.get(partner.va, partner.va)
if (partner.uvface.flipped ^ flipped) != uvedge.uvface.flipped:
paired_a, paired_b = paired_b, paired_a
if phantoms.get(uvedge.va, uvedge.va) is paired_a and phantoms.get(uvedge.vb, uvedge.vb) is paired_b:
# if these two edges will get merged, add them both to the set
merged_uvedges.update((uvedge, partner))
merged_uvedge_pairs.append((uvedge, partner))
break
if uvedge_b not in merged_uvedges:
raise UnfoldError("Export failed. Please report this error, including the model if you can.")
boundary_other = [PhantomUVEdge(phantoms[uvedge.va], phantoms[uvedge.vb], flipped ^ uvedge.uvface.flipped)
for uvedge in other.boundary if uvedge not in merged_uvedges]
# TODO: if is_merged_mine, it might make sense to create a similar list from self.boundary as well
incidence = {vertex.tup for vertex in phantoms.values()}.intersection(vertex.tup for vertex in self.verts)
incidence = {position: list() for position in incidence} # from now on, 'incidence' is a dict
for uvedge in chain(boundary_other, self.boundary):
for vertex in (uvedge.va, uvedge.vb):
site = incidence.get(vertex.tup)
if site is not None:
site.append(uvedge)
for position, segments in incidence.items():
if len(segments) <= 2:
continue
segments.sort(key=slope_from(position))
for right, left in pairs(segments):
is_left_ccw = left.is_uvface_upwards() ^ (left.max.tup == position)
is_right_ccw = right.is_uvface_upwards() ^ (right.max.tup == position)
if is_right_ccw and not is_left_ccw and type(right) is not type(left) and right not in merged_uvedges and left not in merged_uvedges:
return False
if (not is_right_ccw and right not in merged_uvedges) ^ (is_left_ccw and left not in merged_uvedges):
return False
# check for self-intersections
try:
try:
sweepline = QuickSweepline() if self.has_safe_geometry and other.has_safe_geometry else BruteSweepline()
sweep(sweepline, (uvedge for uvedge in chain(boundary_other, self.boundary)))
self.has_safe_geometry &= other.has_safe_geometry
except GeometryError:
sweep(BruteSweepline(), (uvedge for uvedge in chain(boundary_other, self.boundary)))
self.has_safe_geometry = False
except Intersection:
return False
# mark all edges that connect the islands as not cut
for uvedge in merged_uvedges:
uvedge.edge.is_main_cut = False
# include all trasformed vertices as mine
self.verts.update(phantoms.values())
# update the uvverts_by_id dictionary
for source, target in phantoms.items():
present = self.uvverts_by_id.get(target.vertex.index)
if not present:
self.uvverts_by_id[target.vertex.index] = [target]
else:
# emulation of set behavior... sorry, it is faster
if source in present:
present.remove(source)
if target not in present:
present.append(target)
# re-link uvedges and uvfaces to their transformed locations
for uvedge in other.edges:
uvedge.island = self
uvedge.va = phantoms[uvedge.va]
uvedge.vb = phantoms[uvedge.vb]
uvedge.update()
if is_merged_mine:
for uvedge in self.edges:
uvedge.va = phantoms.get(uvedge.va, uvedge.va)
uvedge.vb = phantoms.get(uvedge.vb, uvedge.vb)
self.edges.update(other.edges)
for uvface in other.faces:
uvface.island = self
uvface.verts = [phantoms[uvvertex] for uvvertex in uvface.verts]
uvface.uvvertex_by_id = {index: phantoms[uvvertex]
for index, uvvertex in uvface.uvvertex_by_id.items()}
uvface.flipped ^= flipped
if is_merged_mine:
# there may be own uvvertices that need to be replaced by phantoms
for uvface in self.faces:
if any(uvvertex in phantoms for uvvertex in uvface.verts):
uvface.verts = [phantoms.get(uvvertex, uvvertex) for uvvertex in uvface.verts]
uvface.uvvertex_by_id = {index: phantoms.get(uvvertex, uvvertex)
for index, uvvertex in uvface.uvvertex_by_id.items()}
self.faces.extend(other.faces)
self.boundary = [uvedge for uvedge in
chain(self.boundary, other.boundary) if uvedge not in merged_uvedges]
for uvedge, partner in merged_uvedge_pairs:
# make sure that main faces are the ones actually merged (this changes nothing in most cases)
uvedge.edge.main_faces[:] = uvedge.uvface.face, partner.uvface.face
# everything seems to be OK
return True
def add_marker(self, marker):
self.fake_verts.extend(marker.bounds)
self.markers.append(marker)
def generate_label(self, label=None, abbreviation=None):
"""Assign a name to this island automatically"""
abbr = abbreviation or self.abbreviation or str(self.number)
# TODO: dots should be added in the last instant when outputting any text
if not set('69NZMWpbqd').isdisjoint(abbr) and set('6890oOxXNZMWIlpbqd').issuperset(abbr):
abbr += "."
self.label = label or self.label or "Island {}".format(self.number)
self.abbreviation = abbr
def save_uv(self, tex, cage_size):
"""Save UV Coordinates of all UVFaces to a given UV texture
tex: UV Texture layer to use (BPy MeshUVLoopLayer struct)
page_size: size of the page in pixels (vector)"""
texface = tex.data
for uvface in self.faces:
for i, uvvertex in enumerate(uvface.verts):
uv = uvvertex.co + self.pos
texface[uvface.face.loop_start + i].uv[0] = uv.x / cage_size.x
texface[uvface.face.loop_start + i].uv[1] = uv.y / cage_size.y
def save_uv_separate(self, tex):
"""Save UV Coordinates of all UVFaces to a given UV texture, spanning from 0 to 1
tex: UV Texture layer to use (BPy MeshUVLoopLayer struct)
page_size: size of the page in pixels (vector)"""
texface = tex.data
scale_x, scale_y = 1 / self.bounding_box.x, 1 / self.bounding_box.y
for uvface in self.faces:
for i, uvvertex in enumerate(uvface.verts):
texface[uvface.face.loop_start + i].uv[0] = uvvertex.co.x * scale_x
texface[uvface.face.loop_start + i].uv[1] = uvvertex.co.y * scale_y
class Page:
"""Container for several Islands"""
__slots__ = ('islands', 'name', 'image_path')
def __init__(self, num=1):
self.islands = list()
self.name = "page{}".format(num)
self.image_path = None
class UVVertex:
"""Vertex in 2D"""
__slots__ = ('co', 'vertex', 'tup')
def __init__(self, vector, vertex=None):
self.co = vector.xy
self.vertex = vertex
self.tup = tuple(self.co)
def __repr__(self):
if self.vertex:
return "UV {} [{:.3f}, {:.3f}]".format(self.vertex.index, self.co.x, self.co.y)
else:
return "UV * [{:.3f}, {:.3f}]".format(self.co.x, self.co.y)
class UVEdge:
"""Edge in 2D"""
# Every UVEdge is attached to only one UVFace
# UVEdges are doubled as needed because they both have to point clockwise around their faces
__slots__ = ('va', 'vb', 'island', 'uvface', 'edge',
'min', 'max', 'bottom', 'top',
'neighbor_left', 'neighbor_right', 'sticker')
def __init__(self, vertex1: UVVertex, vertex2: UVVertex, island: Island, uvface, edge):
self.va = vertex1
self.vb = vertex2
self.update()
self.island = island
self.uvface = uvface
self.sticker = None
if edge:
self.edge = edge
edge.uvedges.append(self) #FIXME: editing foreign attribute
def update(self):
"""Update data if UVVertices have moved"""
self.min, self.max = (self.va, self.vb) if (self.va.tup < self.vb.tup) else (self.vb, self.va)
y1, y2 = self.va.co.y, self.vb.co.y
self.bottom, self.top = (y1, y2) if y1 < y2 else (y2, y1)
def is_uvface_upwards(self):
return (self.va.tup < self.vb.tup) ^ self.uvface.flipped
def __repr__(self):
return "({0.va} - {0.vb})".format(self)
class PhantomUVEdge:
"""Temporary 2D Segment for calculations"""
__slots__ = ('va', 'vb', 'min', 'max', 'bottom', 'top')
def __init__(self, vertex1: UVVertex, vertex2: UVVertex, flip):
self.va, self.vb = (vertex2, vertex1) if flip else (vertex1, vertex2)
self.min, self.max = (self.va, self.vb) if (self.va.tup < self.vb.tup) else (self.vb, self.va)
y1, y2 = self.va.co.y, self.vb.co.y
self.bottom, self.top = (y1, y2) if y1 < y2 else (y2, y1)
def is_uvface_upwards(self):
return self.va.tup < self.vb.tup
def __repr__(self):
return "[{0.va} - {0.vb}]".format(self)
class UVFace:
"""Face in 2D"""
__slots__ = ('verts', 'edges', 'face', 'island', 'flipped', 'uvvertex_by_id')
def __init__(self, face: Face, island: Island):
"""Creace an UVFace from a Face and a fixed edge.
face: Face to take coordinates from
island: Island to register itself in
fixed_edge: Edge to connect to (that already has UV coordinates)"""
self.verts = list()
self.face = face
face.uvface = self
self.island = island
self.flipped = False # a flipped UVFace has edges clockwise
rot = z_up_matrix(face.normal)
self.uvvertex_by_id = dict() # link vertex id -> UVVertex
for vertex in face.verts:
uvvertex = UVVertex(rot * vertex.co, vertex)
self.verts.append(uvvertex)
self.uvvertex_by_id[vertex.index] = uvvertex
self.edges = list()
edge_by_verts = dict()
for edge in face.edges:
edge_by_verts[(edge.va.index, edge.vb.index)] = edge
edge_by_verts[(edge.vb.index, edge.va.index)] = edge
for va, vb in pairs(self.verts):
edge = edge_by_verts[(va.vertex.index, vb.vertex.index)]
uvedge = UVEdge(va, vb, island, self, edge)
self.edges.append(uvedge)
edge.uvedges.append(uvedge) #FIXME: editing foreign attribute
class Arrow:
"""Mark in the document: an arrow denoting the number of the edge it points to"""
__slots__ = ('bounds', 'center', 'rot', 'text', 'size')
def __init__(self, uvedge, size, index):
self.text = str(index)
edge = (uvedge.vb.co - uvedge.va.co) if not uvedge.uvface.flipped else (uvedge.va.co - uvedge.vb.co)
self.center = (uvedge.va.co + uvedge.vb.co) / 2
self.size = size
sin, cos = edge.y / edge.length, edge.x / edge.length
self.rot = M.Matrix(((cos, -sin), (sin, cos)))
tangent = edge.normalized()
normal = M.Vector((tangent.y, -tangent.x))
self.bounds = [self.center, self.center + (1.2*normal + tangent)*size, self.center + (1.2*normal - tangent)*size]
class Sticker:
"""Mark in the document: sticker tab"""
__slots__ = ('bounds', 'center', 'rot', 'text', 'width', 'vertices')
def __init__(self, uvedge, default_width=0.005, index=None, target_island=None):
"""Sticker is directly attached to the given UVEdge"""
first_vertex, second_vertex = (uvedge.va, uvedge.vb) if not uvedge.uvface.flipped else (uvedge.vb, uvedge.va)
edge = first_vertex.co - second_vertex.co
sticker_width = min(default_width, edge.length / 2)
other = uvedge.edge.other_uvedge(uvedge) # This is the other uvedge - the sticking target
other_first, other_second = (other.va, other.vb) if not other.uvface.flipped else (other.vb, other.va)
other_edge = other_second.co - other_first.co
# angle a is at vertex uvedge.va, b is at uvedge.vb
cos_a = cos_b = 0.5
sin_a = sin_b = 0.75**0.5
# len_a is length of the side adjacent to vertex a, len_b likewise
len_a = len_b = sticker_width / sin_a
# fix overlaps with the most often neighbour - its sticking target
if first_vertex == other_second:
cos_a = max(cos_a, (edge*other_edge) / (edge.length**2)) # angles between pi/3 and 0
sin_a = abs(1 - cos_a**2)**0.5
len_b = min(len_a, (edge.length*sin_a) / (sin_a*cos_b + sin_b*cos_a))
len_a = 0 if sin_a == 0 else min(sticker_width / sin_a, (edge.length - len_b*cos_b) / cos_a)
elif second_vertex == other_first:
cos_b = max(cos_b, (edge*other_edge) / (edge.length**2)) # angles between pi/3 and 0
sin_b = abs(1 - cos_b**2)**0.5
len_a = min(len_a, (edge.length*sin_b) / (sin_a*cos_b + sin_b*cos_a))
len_b = 0 if sin_b == 0 else min(sticker_width / sin_b, (edge.length - len_a*cos_a) / cos_b)
v3 = UVVertex(second_vertex.co + M.Matrix(((cos_b, -sin_b), (sin_b, cos_b))) * edge * len_b / edge.length)
v4 = UVVertex(first_vertex.co + M.Matrix(((-cos_a, -sin_a), (sin_a, -cos_a))) * edge * len_a / edge.length)
if v3.co != v4.co:
self.vertices = [second_vertex, v3, v4, first_vertex]
else:
self.vertices = [second_vertex, v3, first_vertex]
sin, cos = edge.y / edge.length, edge.x / edge.length
self.rot = M.Matrix(((cos, -sin), (sin, cos)))
self.width = sticker_width * 0.9
if index and target_island is not uvedge.island:
self.text = "{}:{}".format(target_island.abbreviation, index)
else:
self.text = index
self.center = (uvedge.va.co + uvedge.vb.co) / 2 + self.rot*M.Vector((0, self.width*0.2))
self.bounds = [v3.co, v4.co, self.center] if v3.co != v4.co else [v3.co, self.center]
class NumberAlone:
"""Mark in the document: numbering inside the island denoting edges to be sticked"""
__slots__ = ('bounds', 'center', 'rot', 'text', 'size')
def __init__(self, uvedge, index, default_size=0.005):
"""Sticker is directly attached to the given UVEdge"""
edge = (uvedge.va.co - uvedge.vb.co) if not uvedge.uvface.flipped else (uvedge.vb.co - uvedge.va.co)
self.size = default_size
sin, cos = edge.y / edge.length, edge.x / edge.length
self.rot = M.Matrix(((cos, -sin), (sin, cos)))
self.text = index
self.center = (uvedge.va.co + uvedge.vb.co) / 2 - self.rot*M.Vector((0, self.size*1.2))
self.bounds = [self.center]
class SVG:
"""Simple SVG exporter"""
def __init__(self, page_size: M.Vector, ppm, style, pure_net=True):
"""Initialize document settings.
page_size: document dimensions in meters
pure_net: if True, do not use image"""
self.page_size = page_size
self.ppm = ppm
self.pure_net = pure_net
self.style = style
self.margin = 0
self.text_size = 12
def format_vertex(self, vector, pos=M.Vector((0, 0))):
"""Return a string with both coordinates of the given vertex."""
x, y = vector + pos
return "{:.6f} {:.6f}".format((x + self.margin) * self.ppm, (self.page_size.y - y - self.margin) * self.ppm)
def write(self, mesh, filename):
"""Write data to a file given by its name."""
line_through = " L ".join # used for formatting of SVG path data
format_style = {'SOLID': "none", 'DOT': "0.2,4", 'DASH': "4,8", 'LONGDASH': "6,3", 'DASHDOT': "8,4,2,4"}
rows = "\n".join
def format_color(vec):
return "#{:02x}{:02x}{:02x}".format(round(vec[0] * 255), round(vec[1] * 255), round(vec[2] * 255))
def format_matrix(matrix):
return " ".join(str(cell) for column in matrix for cell in column)
def path_convert(string, relto=os_path.dirname(filename)):
assert(os_path) # check the module was imported
string = os_path.relpath(string, relto)
if os_path.sep != '/':
string = string.replace(os_path.sep, '/')
return string
styleargs = {name: format_color(getattr(self.style, name)) for name in
("outer_color", "outbg_color", "convex_color", "concave_color",
"inbg_color", "sticker_fill", "text_color")}
styleargs.update({name: format_style[getattr(self.style, name)] for name in
("outer_style", "convex_style", "concave_style")})
styleargs.update({name: getattr(self.style, attr)[3] for name, attr in
(("outer_alpha", "outer_color"), ("outbg_alpha", "outbg_color"),
("convex_alpha", "convex_color"), ("concave_alpha", "concave_color"),
("inbg_alpha", "inbg_color"), ("sticker_alpha", "sticker_fill"),
("text_alpha", "text_color"))})
styleargs.update({name: getattr(self.style, name) for name in
("outer_width", "convex_width", "concave_width")})
styleargs.update({"outbg_width": self.style.outer_width * self.style.outbg_width,
"convexbg_width": self.style.convex_width * self.style.inbg_width,
"concavebg_width": self.style.concave_width * self.style.inbg_width})
page_size_pixels = self.page_size * self.ppm
margin_pixels = self.margin * self.ppm
for num, page in enumerate(mesh.pages):
with open("{}_{}.svg".format(filename, page.name), 'w') as f:
print(self.svg_base.format(width=page_size_pixels.x, height=page_size_pixels.y), file=f)
print(self.css_base.format(**styleargs), file=f)
if page.image_path:
print(self.image_linked_tag.format(
pos="{0} {0}".format(margin_pixels),
width=page_size_pixels.x - 2 * margin_pixels,
height=page_size_pixels.y - 2 * margin_pixels,
path=path_convert(page.image_path)),
file=f)
if len(page.islands) > 1:
print("<g>", file=f)
for island in page.islands:
print("<g>", file=f)
if island.image_path:
print(self.image_linked_tag.format(
pos=self.format_vertex(island.pos + M.Vector((0, island.bounding_box.y))),
width=island.bounding_box.x*self.ppm,
height=island.bounding_box.y*self.ppm,
path=path_convert(island.image_path)),
file=f)
elif island.embedded_image:
print(self.image_embedded_tag.format(
pos=self.format_vertex(island.pos + M.Vector((0, island.bounding_box.y))),
width=island.bounding_box.x*self.ppm,
height=island.bounding_box.y*self.ppm,
path=island.image_path),
island.embedded_image, "'/>",
file=f, sep="")
if island.title:
print(self.text_tag.format(
size=self.ppm * self.text_size,
x=self.ppm * (island.bounding_box.x*0.5 + island.pos.x + self.margin),
y=self.ppm * (self.page_size.y - island.pos.y - self.margin),
label=island.title), file=f)
data_markers, data_stickerfill, data_outer, data_convex, data_concave = (list() for i in range(5))
for marker in island.markers:
if isinstance(marker, Sticker):
data_stickerfill.append("M {} Z".format(
line_through(self.format_vertex(vertex.co, island.pos) for vertex in marker.vertices)))
if marker.text:
data_markers.append(self.text_transformed_tag.format(
label=marker.text,
pos=self.format_vertex(marker.center, island.pos),
mat=format_matrix(marker.width * self.ppm * marker.rot)))
elif isinstance(marker, Arrow):
size = marker.size * self.ppm
position = marker.center + marker.rot*marker.size*M.Vector((0, -0.9))
data_markers.append(self.arrow_marker_tag.format(
index=marker.text,
arrow_pos=self.format_vertex(marker.center, island.pos),
scale=size,
pos=self.format_vertex(position, island.pos - marker.size*M.Vector((0, 0.4))),
mat=format_matrix(size * marker.rot)))
elif isinstance(marker, NumberAlone):
size = marker.size * self.ppm
data_markers.append(self.text_transformed_tag.format(
label=marker.text,
pos=self.format_vertex(marker.center, island.pos),
mat=format_matrix(size * marker.rot)))
if data_stickerfill and self.style.sticker_fill[3] > 0:
print("<path class='sticker' d='", rows(data_stickerfill), "'/>", file=f)
outer_edges = set(island.boundary)
while outer_edges:
data_loop = list()
uvedge = outer_edges.pop()
while 1:
if uvedge.sticker:
data_loop.extend(self.format_vertex(vertex.co, island.pos) for vertex in uvedge.sticker.vertices[1:])
else:
vertex = uvedge.vb if uvedge.uvface.flipped else uvedge.va
data_loop.append(self.format_vertex(vertex.co, island.pos))
uvedge = uvedge.neighbor_right
try:
outer_edges.remove(uvedge)
except KeyError:
break
data_outer.append("M {} Z".format(line_through(data_loop)))
for uvedge in island.edges:
edge = uvedge.edge
if edge.is_cut(uvedge.uvface.face) and not uvedge.sticker:
continue
data_uvedge = "M {}".format(
line_through(self.format_vertex(vertex.co, island.pos) for vertex in (uvedge.va, uvedge.vb)))
# each uvedge is in two opposite-oriented variants; we want to add each only once
if uvedge.sticker or uvedge.uvface.flipped != (uvedge.va.vertex.index > uvedge.vb.vertex.index):
if edge.angle > 0.01:
data_convex.append(data_uvedge)
elif edge.angle < -0.01:
data_concave.append(data_uvedge)
if island.is_inside_out:
data_convex, data_concave = data_concave, data_convex
if data_convex:
if not self.pure_net and self.style.use_inbg:
print("<path class='convex_background' d='", rows(data_convex), "'/>", file=f)
print("<path class='convex' d='", rows(data_convex), "'/>", file=f)
if data_concave:
if not self.pure_net and self.style.use_inbg:
print("<path class='concave_background' d='", rows(data_concave), "'/>", file=f)
print("<path class='concave' d='", rows(data_concave), "'/>", file=f)
if data_outer:
if not self.pure_net and self.style.use_outbg:
print("<path class='outer_background' d='", rows(data_outer), "'/>", file=f)
print("<path class='outer' d='", rows(data_outer), "'/>", file=f)
if data_markers:
print(rows(data_markers), file=f)
print("</g>", file=f)
if len(page.islands) > 1:
print("</g>", file=f)
print("</svg>", file=f)
image_linked_tag = "<image transform='translate({pos})' width='{width}' height='{height}' xlink:href='{path}'/>"
image_embedded_tag = "<image transform='translate({pos})' width='{width}' height='{height}' xlink:href='data:image/png;base64,"
text_tag = "<text transform='translate({x} {y}) scale({size})'><tspan>{label}</tspan></text>"
text_transformed_tag = "<text transform='matrix({mat} {pos})'><tspan>{label}</tspan></text>"
arrow_marker_tag = "<g><path transform='matrix({mat} {arrow_pos})' class='arrow' d='M 0 0 L 1 1 L 0 0.25 L -1 1 Z'/>" \
"<text class='scaled' transform='matrix({scale} 0 0 {scale} {pos})'><tspan>{index}</tspan></text></g>"
svg_base = """<?xml version='1.0' encoding='UTF-8' standalone='no'?>
<svg xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' version='1.1'
x='0px' y='0px' width='{width}px' height='{height}px'>"""
css_base = """<style type="text/css">
path {{
fill: none;
stroke-width: {outer_width:.2}px;
stroke-linecap: square;
stroke-linejoin: bevel;
stroke-dasharray: none;
}}
path.outer {{
stroke: {outer_color};
stroke-dasharray: {outer_style};
stroke-dashoffset: 0;
stroke-width: {outer_width:.2}px;
stroke-opacity: {outer_alpha:.2};
}}
path.convex {{
stroke: {convex_color};
stroke-dasharray: {convex_style};
stroke-dashoffset:0;
stroke-width:{convex_width:.2}px;
stroke-opacity: {convex_alpha:.2}
}}
path.concave {{
stroke: {concave_color};
stroke-dasharray: {concave_style};
stroke-dashoffset: 0;
stroke-width: {concave_width:.2}px;
stroke-opacity: {concave_alpha:.2}
}}
path.outer_background {{
stroke: {outbg_color};
stroke-opacity: {outbg_alpha};
stroke-width: {outbg_width:.2}px
}}
path.convex_background {{
stroke: {inbg_color};
stroke-opacity: {inbg_alpha};
stroke-width: {convexbg_width:.2}px
}}
path.concave_background {{
stroke:{inbg_color};
stroke-opacity:{inbg_alpha};
stroke-width:{concavebg_width:.2}px
}}
path.sticker {{
fill: {sticker_fill};
stroke: none;
fill-opacity: {sticker_alpha:.2};
}}
path.arrow {{
fill: #000;
}}
text {{
font-size: 1px;
font-style: normal;
fill: {text_color};
fill-opacity: {text_alpha:.2};
stroke: none;
}}
tspan {{
text-anchor:middle;
}}
</style>"""
class Unfold(bpy.types.Operator):
"""Blender Operator: unfold the selected object."""
bl_idname = "mesh.unfold"
bl_label = "Unfold"
bl_description = "Mark seams so that the mesh can be exported as a paper model"
bl_options = {'REGISTER', 'UNDO'}
edit = bpy.props.BoolProperty(name="", description="", default=False, options={'HIDDEN'})
priority_effect_convex = bpy.props.FloatProperty(name="Priority Convex",
description="Priority effect for edges in convex angles",
default=default_priority_effect['CONVEX'], soft_min=-1, soft_max=10, subtype='FACTOR')
priority_effect_concave = bpy.props.FloatProperty(name="Priority Concave",
description="Priority effect for edges in concave angles",
default=default_priority_effect['CONCAVE'], soft_min=-1, soft_max=10, subtype='FACTOR')
priority_effect_length = bpy.props.FloatProperty(name="Priority Length",
description="Priority effect of edge length",
default=default_priority_effect['LENGTH'], soft_min=-10, soft_max=1, subtype='FACTOR')
do_create_uvmap = bpy.props.BoolProperty(name="Create UVMap",
description="Create a new UV Map showing the islands and page layout", default=False)
object = None
@classmethod
def poll(cls, context):
return context.active_object and context.active_object.type == "MESH"
def draw(self, context):
layout = self.layout
col = layout.column()
col.active = not self.object or len(self.object.data.uv_textures) < 8
col.prop(self.properties, "do_create_uvmap")
layout.label(text="Edge Cutting Factors:")
col = layout.column(align=True)
col.label(text="Face Angle:")
col.prop(self.properties, "priority_effect_convex", text="Convex")
col.prop(self.properties, "priority_effect_concave", text="Concave")
layout.prop(self.properties, "priority_effect_length", text="Edge Length")
def execute(self, context):
sce = bpy.context.scene
settings = sce.paper_model
recall_mode = context.object.mode
bpy.ops.object.mode_set(mode='OBJECT')
recall_display_islands, sce.paper_model.display_islands = sce.paper_model.display_islands, False
self.object = context.active_object
mesh = self.object.data
cage_size = M.Vector((settings.output_size_x, settings.output_size_y)) if settings.limit_by_page else None
priority_effect = {'CONVEX': self.priority_effect_convex,'CONCAVE': self.priority_effect_concave, 'LENGTH': self.priority_effect_length}
unfolder = Unfolder(self.object)
unfolder.prepare(cage_size, self.do_create_uvmap, mark_seams=True, priority_effect=priority_effect, scale=sce.unit_settings.scale_length/settings.scale)
if mesh.paper_island_list:
unfolder.copy_island_names(mesh.paper_island_list)
island_list = mesh.paper_island_list
island_list.clear() # remove previously defined islands
for island in unfolder.mesh.islands:
# add islands to UI list and set default descriptions
list_item = island_list.add()
# add faces' IDs to the island
for uvface in island.faces:
lface = list_item.faces.add()
lface.id = uvface.face.index
# name must be set afterwards because it invokes an update callback
list_item["abbreviation"] = island.abbreviation or "?"
list_item.label = island.label or "No Name"
mesh.paper_island_index = -1
mesh.show_edge_seams = True
bpy.ops.object.mode_set(mode=recall_mode)
sce.paper_model.display_islands = recall_display_islands
return {'FINISHED'}
class ClearAllSeams(bpy.types.Operator):
"""Blender Operator: clear all seams of the active Mesh and all its unfold data"""
bl_idname = "mesh.clear_all_seams"
bl_label = "Clear All Seams"
bl_description = "Clear all the seams and unfolded islands of the active object"
@classmethod
def poll(cls, context):
return context.active_object and context.active_object.type == 'MESH'
def execute(self, context):
ob = context.active_object
mesh = ob.data
for edge in mesh.edges:
edge.use_seam = False
mesh.paper_island_list.clear()
return {'FINISHED'}
def page_size_preset_changed(self, context):
"""Update the actual document size to correct values"""
if self.page_size_preset == 'A4':
self.output_size_x = 0.210
self.output_size_y = 0.297
elif self.page_size_preset == 'A3':
self.output_size_x = 0.297
self.output_size_y = 0.420
elif self.page_size_preset == 'US_LETTER':
self.output_size_x = 0.216
self.output_size_y = 0.279
elif self.page_size_preset == 'US_LEGAL':
self.output_size_x = 0.216
self.output_size_y = 0.356
class PaperModelStyle(bpy.types.PropertyGroup):
line_styles = [
('SOLID', "Solid (----)", "Solid line"),
('DOT', "Dots (. . .)", "Dotted line"),
('DASH', "Short Dashes (- - -)", "Solid line"),
('LONGDASH', "Long Dashes (-- --)", "Solid line"),
('DASHDOT', "Dash-dotted (-- .)", "Solid line")
]
outer_color = bpy.props.FloatVectorProperty(name="Outer Lines",
description="Color of net outline",
default=(0.0, 0.0, 0.0, 1.0), min=0, max=1, subtype='COLOR', size=4)
outer_style = bpy.props.EnumProperty(name="Outer Lines Drawing Style",
description="Drawing style of net outline",
default='SOLID', items=line_styles)
outer_width = bpy.props.FloatProperty(name="Outer Lines Thickness",
description="Thickness of net outline, in pixels",
default=1.5, min=0, soft_max=10, precision=1)
use_outbg = bpy.props.BoolProperty(name="Highlight Outer Lines",
description="Add another line below every line to improve contrast",
default=True)
outbg_color = bpy.props.FloatVectorProperty(name="Outer Highlight",
description="Color of the highlight for outer lines",
default=(1.0, 1.0, 1.0, 1.0), min=0, max=1, subtype='COLOR', size=4)
outbg_width = bpy.props.FloatProperty(name="Outer Highlight Scale",
description="Thickness of the highlighting lines as a multiple of the outer line",
default=1.5, min=1, soft_max=3, subtype='FACTOR')
convex_color = bpy.props.FloatVectorProperty(name="Inner Convex Lines",
description="Color of lines to be folded to a convex angle",
default=(0.0, 0.0, 0.0, 1.0), min=0, max=1, subtype='COLOR', size=4)
convex_style = bpy.props.EnumProperty(name="Convex Lines Drawing Style",
description="Drawing style of lines to be folded to a convex angle",
default='DASH', items=line_styles)
convex_width = bpy.props.FloatProperty(name="Convex Lines Thickness",
description="Thickness of concave lines, in pixels",
default=1, min=0, soft_max=10, precision=1)
concave_color = bpy.props.FloatVectorProperty(name="Inner Concave Lines",
description="Color of lines to be folded to a concave angle",
default=(0.0, 0.0, 0.0, 1.0), min=0, max=1, subtype='COLOR', size=4)
concave_style = bpy.props.EnumProperty(name="Concave Lines Drawing Style",
description="Drawing style of lines to be folded to a concave angle",
default='DASHDOT', items=line_styles)
concave_width = bpy.props.FloatProperty(name="Concave Lines Thickness",
description="Thickness of concave lines, in pixels",
default=1, min=0, soft_max=10, precision=1)
use_inbg = bpy.props.BoolProperty(name="Highlight Inner Lines",
description="Add another line below every line to improve contrast",
default=True)
inbg_color = bpy.props.FloatVectorProperty(name="Inner Highlight",
description="Color of the highlight for inner lines",
default=(1.0, 1.0, 1.0, 1.0), min=0, max=1, subtype='COLOR', size=4)
inbg_width = bpy.props.FloatProperty(name="Inner Highlight Scale",
description="Thickness of the highlighting lines as a multiple of the inner line",
default=1, min=1, soft_max=3, subtype='FACTOR')
sticker_fill = bpy.props.FloatVectorProperty(name="Tabs Fill",
description="Fill color of sticking tabs",
default=(0.9, 0.9, 0.9, 1.0), min=0, max=1, subtype='COLOR', size=4)
text_color = bpy.props.FloatVectorProperty(name="Text Color",
description="Color of all text used in the document",
default=(0.0, 0.0, 0.0, 1.0), min=0, max=1, subtype='COLOR', size=4)
bpy.utils.register_class(PaperModelStyle)
class ExportPaperModel(bpy.types.Operator):
"""Blender Operator: save the selected object's net and optionally bake its texture"""
bl_idname = "export_mesh.paper_model"
bl_label = "Export Paper Model"
bl_description = "Export the selected object's net and optionally bake its texture"
filepath = bpy.props.StringProperty(name="File Path",
description="Target file to save the SVG")
filename = bpy.props.StringProperty(name="File Name",
description="Name of the file")
directory = bpy.props.StringProperty(name="Directory",
description="Directory of the file")
page_size_preset = bpy.props.EnumProperty(name="Page Size",
description="Size of the exported document",
default='A4', update=page_size_preset_changed, items=[
('USER', "User defined", "User defined paper size"),
('A4', "A4", "International standard paper size"),
('A3', "A3", "International standard paper size"),
('US_LETTER', "Letter", "North American paper size"),
('US_LEGAL', "Legal", "North American paper size")
])
output_size_x = bpy.props.FloatProperty(name="Page Width",
description="Width of the exported document",
default=0.210, soft_min=0.105, soft_max=0.841, subtype="UNSIGNED", unit="LENGTH")
output_size_y = bpy.props.FloatProperty(name="Page Height",
description="Height of the exported document",
default=0.297, soft_min=0.148, soft_max=1.189, subtype="UNSIGNED", unit="LENGTH")
output_margin = bpy.props.FloatProperty(name="Page Margin",
description="Distance from page borders to the printable area",
default=0.005, min=0, soft_max=0.1, step=0.1, subtype="UNSIGNED", unit="LENGTH")
output_dpi = bpy.props.FloatProperty(name="Unfolder DPI",
description="Resolution of images and lines in pixels per inch",
default=90, min=1, soft_min=30, soft_max=600, subtype="UNSIGNED")
output_type = bpy.props.EnumProperty(name="Textures",
description="Source of a texture for the model",
default='NONE', items=[
('NONE', "No Texture", "Export the net only"),
('TEXTURE', "Face Texture", "Export the active texture as it is in the 3D View"),
campbellbartonUnsubmitted
Not Done
Inline Actions

I think this is a bit confusing, why not import bmesh and call bmesh.new ?

campbellbarton: I think this is a bit confusing, why not import `bmesh` and call `bmesh.new` ?
emuAuthorUnsubmitted
Not Done
Inline Actions

this way seemed to look more like Python to me, but I should better just conform with the API.
I'll change it to bmesh.new

emu: this way seemed to look more like Python to me, but I should better just conform with the API.
emuAuthorUnsubmitted
Not Done
Inline Actions

Or perhaps I'll just remove this function for now. It's commented out from the UI.
I have this functionality in a branch, but it will take a few more weeks to finish.

emu: Or perhaps I'll just remove this function for now. It's commented out from the UI. I have this…
('RENDER', "Full Render", "Render the material of the model, including all illumination"),
('SELECTED_TO_ACTIVE', "Selected to Active", "Use the selected surrounding objects as a texture")
])
do_create_stickers = bpy.props.BoolProperty(name="Create Tabs",
description="Create gluing tabs around the net (useful for paper)",
default=True)
do_create_numbers = bpy.props.BoolProperty(name="Create Numbers",
description="Enumerate edges to make it clear which edges should be sticked together",
default=True)
sticker_width = bpy.props.FloatProperty(name="Tabs and Text Size",
description="Width of gluing tabs and their numbers",
default=0.005, soft_min=0, soft_max=0.05, step=0.1, subtype="UNSIGNED", unit="LENGTH")
image_packing = bpy.props.EnumProperty(name="Image Packing Method",
description="Method of attaching baked image(s) to the SVG",
default='PAGE_LINK', items=[
('PAGE_LINK', "Single Linked", "Bake one image per page of output"),
('ISLAND_LINK', "Linked", "Bake images separately for each island and save them in a directory"),
('ISLAND_EMBED', "Embedded", "Bake images separately for each island and embed them into the SVG")
])
scale = bpy.props.FloatProperty(name="Scale",
description="Divisor of all dimensions when exporting",
default=1, soft_min=1.0, soft_max=10000.0, step=100, subtype='UNSIGNED', precision=0)
do_create_uvmap = bpy.props.BoolProperty(name="Create UVMap",
description="Create a new UV Map showing the islands and page layout",
default=False)
ui_expanded_document = bpy.props.BoolProperty(name="Show Document Settings Expanded",
description="Shows the box 'Document Settings' expanded in user interface",
default=True)
ui_expanded_style = bpy.props.BoolProperty(name="Show Style Settings Expanded",
description="Shows the box 'Colors and Style' expanded in user interface",
default=False)
style = bpy.props.PointerProperty(type=PaperModelStyle)
unfolder = None
largest_island_ratio = 0
@classmethod
def poll(cls, context):
return context.active_object and context.active_object.type == 'MESH'
def execute(self, context):
try:
if self.object.data.paper_island_list:
self.unfolder.copy_island_names(self.object.data.paper_island_list)
self.unfolder.save(self.properties)
self.report({'INFO'}, "Saved a {}-page document".format(len(self.unfolder.mesh.pages)))
return {'FINISHED'}
except UnfoldError as error:
self.report(type={'ERROR_INVALID_INPUT'}, message=error.args[0])
return {'CANCELLED'}
except:
raise
def get_scale_ratio(self, sce):
margin = self.output_margin + self.sticker_width + 1e-5
if min(self.output_size_x, self.output_size_y) <= 2 * margin:
return False
output_inner_size = M.Vector((self.output_size_x - 2*margin, self.output_size_y - 2*margin))
ratio = self.unfolder.mesh.largest_island_ratio(output_inner_size)
return ratio * sce.unit_settings.scale_length / self.scale
def invoke(self, context, event):
sce = context.scene
self.scale = sce.paper_model.scale
self.object = context.active_object
self.unfolder = Unfolder(self.object)
cage_size = M.Vector((sce.paper_model.output_size_x, sce.paper_model.output_size_y)) if sce.paper_model.limit_by_page else None
self.unfolder.prepare(cage_size, create_uvmap=self.do_create_uvmap, scale=sce.unit_settings.scale_length/self.scale)
scale_ratio = self.get_scale_ratio(sce)
if scale_ratio > 1:
self.scale *= scale_ratio
wm = context.window_manager
wm.fileselect_add(self)
return {'RUNNING_MODAL'}
def draw(self, context):
layout = self.layout
# a little hack: this prints out something like "Scale: 1: 72"
layout.prop(self.properties, "scale", text="Scale: 1")
scale_ratio = self.get_scale_ratio(context.scene)
if scale_ratio > 1:
layout.label(text="An island is roughly {:.1f}x bigger than page".format(scale_ratio), icon="ERROR")
elif scale_ratio > 0:
layout.label(text="Largest island is roughly 1/{:.1f} of page".format(1 / scale_ratio))
layout.prop(self.properties, "do_create_uvmap")
box = layout.box()
row = box.row(align=True)
row.prop(self.properties, "ui_expanded_document", text="",
icon=('TRIA_DOWN' if self.ui_expanded_document else 'TRIA_RIGHT'), emboss=False)
row.label(text="Document Settings")
if self.ui_expanded_document:
box.prop(self.properties, "page_size_preset")
col = box.column(align=True)
col.active = self.page_size_preset == 'USER'
col.prop(self.properties, "output_size_x")
col.prop(self.properties, "output_size_y")
box.prop(self.properties, "output_margin")
box.prop(self.properties, "output_dpi")
col = box.column()
col.prop(self.properties, "do_create_stickers")
col.prop(self.properties, "do_create_numbers")
col = box.column()
col.active = self.do_create_stickers or self.do_create_numbers
col.prop(self.properties, "sticker_width")
box.prop(self.properties, "output_type")
col = box.column()
col.active = self.output_type != 'NONE'
if len(self.object.data.uv_textures) == 8:
col.label(text="No UV slots left, No Texture is the only option.", icon='ERROR')
elif context.scene.render.engine != 'BLENDER_RENDER' and self.output_type != 'NONE':
col.label(text="Blender Internal engine will be used for texture baking.", icon='ERROR')
col.prop(self.properties, "image_packing", text="Images")
box = layout.box()
row = box.row(align=True)
row.prop(self.properties, "ui_expanded_style", text="",
icon=('TRIA_DOWN' if self.ui_expanded_style else 'TRIA_RIGHT'), emboss=False)
row.label(text="Colors and Style")
if self.ui_expanded_style:
col = box.column()
col.prop(self.style, "outer_color")
col.prop(self.style, "outer_width", text="Width (pixels)")
col.prop(self.style, "outer_style", text="Style")
col = box.column()
col.active = self.output_type != 'NONE'
col.prop(self.style, "use_outbg", text="Outer Lines Highlight:")
sub = col.column()
sub.active = self.output_type != 'NONE' and self.style.use_outbg
sub.prop(self.style, "outbg_color", text="")
sub.prop(self.style, "outbg_width", text="Relative width")
col = box.column()
col.prop(self.style, "convex_color")
col.prop(self.style, "convex_width", text="Width (pixels)")
col.prop(self.style, "convex_style", text="Style")
col = box.column()
col.prop(self.style, "concave_color")
col.prop(self.style, "concave_width", text="Width (pixels)")
col.prop(self.style, "concave_style", text="Style")
col = box.column()
col.active = self.output_type != 'NONE'
col.prop(self.style, "use_inbg", text="Inner Lines Highlight:")
sub = col.column()
sub.active = self.output_type != 'NONE' and self.style.use_inbg
sub.prop(self.style, "inbg_color", text="")
sub.prop(self.style, "inbg_width", text="Relative width")
col = box.column()
col.active = self.do_create_stickers
col.prop(self.style, "sticker_fill")
box.prop(self.style, "text_color")
def menu_func(self, context):
self.layout.operator("export_mesh.paper_model", text="Paper Model (.svg)")
class VIEW3D_PT_paper_model_tools(bpy.types.Panel):
bl_label = "Tools"
bl_space_type = "VIEW_3D"
bl_region_type = "TOOLS"
bl_category = "Paper Model"
def draw(self, context):
layout = self.layout
sce = context.scene
obj = context.active_object
mesh = obj.data if obj and obj.type == 'MESH' else None
layout.operator("export_mesh.paper_model")
col = layout.column(align=True)
col.label("Customization:")
col.operator("mesh.unfold")
if context.mode == 'EDIT_MESH':
row = layout.row(align=True)
row.operator("mesh.mark_seam", text="Mark Seam").clear = False
row.operator("mesh.mark_seam", text="Clear Seam").clear = True
else:
layout.operator("mesh.clear_all_seams")
layout.prop(sce.paper_model, "scale", text="Model Scale: 1")
col = layout.column(align=True)
col.prop(sce.paper_model, "limit_by_page")
sub = col.column(align=True)
sub.active = sce.paper_model.limit_by_page
sub.prop(sce.paper_model, "output_size_x")
sub.prop(sce.paper_model, "output_size_y")
class VIEW3D_PT_paper_model_islands(bpy.types.Panel):
bl_label = "Islands"
bl_space_type = "VIEW_3D"
bl_region_type = "TOOLS"
bl_category = "Paper Model"
def draw(self, context):
layout = self.layout
sce = context.scene
obj = context.active_object
mesh = obj.data if obj and obj.type == 'MESH' else None
if mesh and mesh.paper_island_list:
layout.label(text="1 island:" if len(mesh.paper_island_list) == 1 else
"{} islands:".format(len(mesh.paper_island_list)))
layout.template_list('UI_UL_list', 'paper_model_island_list', mesh,
'paper_island_list', mesh, 'paper_island_index', rows=1, maxrows=5)
if mesh.paper_island_index >= 0:
list_item = mesh.paper_island_list[mesh.paper_island_index]
sub = layout.column(align=True)
sub.prop(list_item, "label")
sub.prop(list_item, "auto_abbrev")
row = sub.row()
row.active = not list_item.auto_abbrev
row.prop(list_item, "abbreviation")
else:
layout.label(text="Not unfolded")
layout.box().label("Use the 'Unfold' tool")
sub = layout.column(align=True)
sub.active = bool(mesh and mesh.paper_island_list)
sub.prop(sce.paper_model, "display_islands", icon='RESTRICT_VIEW_OFF')
row = sub.row(align=True)
row.active = bool(sce.paper_model.display_islands and mesh and mesh.paper_island_list)
row.prop(sce.paper_model, "islands_alpha", slider=True)
def display_islands(self, context):
# TODO: save the vertex positions and don't recalculate them always?
ob = context.active_object
if not ob or ob.type != 'MESH':
return
mesh = ob.data
if not mesh.paper_island_list or mesh.paper_island_index == -1:
return
bgl.glMatrixMode(bgl.GL_PROJECTION)
perspMatrix = context.space_data.region_3d.perspective_matrix
perspBuff = bgl.Buffer(bgl.GL_FLOAT, (4, 4), perspMatrix.transposed())
bgl.glLoadMatrixf(perspBuff)
bgl.glMatrixMode(bgl.GL_MODELVIEW)
objectBuff = bgl.Buffer(bgl.GL_FLOAT, (4, 4), ob.matrix_world.transposed())
bgl.glLoadMatrixf(objectBuff)
bgl.glEnable(bgl.GL_BLEND)
bgl.glBlendFunc(bgl.GL_SRC_ALPHA, bgl.GL_ONE_MINUS_SRC_ALPHA)
bgl.glEnable(bgl.GL_POLYGON_OFFSET_FILL)
bgl.glPolygonOffset(0, -10) # offset in Zbuffer to remove flicker
bgl.glPolygonMode(bgl.GL_FRONT_AND_BACK, bgl.GL_FILL)
bgl.glColor4f(1.0, 0.4, 0.0, self.islands_alpha)
island = mesh.paper_island_list[mesh.paper_island_index]
for lface in island.faces:
face = mesh.polygons[lface.id]
bgl.glBegin(bgl.GL_POLYGON)
for vertex_id in face.vertices:
vertex = mesh.vertices[vertex_id]
bgl.glVertex4f(*vertex.co.to_4d())
bgl.glEnd()
bgl.glPolygonOffset(0.0, 0.0)
bgl.glDisable(bgl.GL_POLYGON_OFFSET_FILL)
bgl.glLoadIdentity()
display_islands.handle = None
def display_islands_changed(self, context):
"""Switch highlighting islands on/off"""
if self.display_islands:
if not display_islands.handle:
display_islands.handle = bpy.types.SpaceView3D.draw_handler_add(display_islands, (self, context), 'WINDOW', 'POST_VIEW')
else:
if display_islands.handle:
bpy.types.SpaceView3D.draw_handler_remove(display_islands.handle, 'WINDOW')
display_islands.handle = None
def label_changed(self, context):
"""The labelling of an island was changed"""
# accessing properties via [..] to avoid a recursive call after the update
if self.auto_abbrev:
self["abbreviation"] = "".join(first_letters(self.label)).upper()
elif len(self.abbreviation) > 3:
self["abbreviation"] = self.abbreviation[:3]
self.name = "[{}] {} ({} {})".format(self.abbreviation, self.label, len(self.faces), "faces" if len(self.faces) > 1 else "face")
class FaceList(bpy.types.PropertyGroup):
id = bpy.props.IntProperty(name="Face ID")
class IslandList(bpy.types.PropertyGroup):
faces = bpy.props.CollectionProperty(type=FaceList, name="Faces",
description="Faces belonging to this island")
label = bpy.props.StringProperty(name="Label",
description="Label on this island",
default="", update=label_changed)
abbreviation = bpy.props.StringProperty(name="Abbreviation",
description="Three-letter label to use when there is not enough space",
default="", update=label_changed)
auto_abbrev = bpy.props.BoolProperty(name="Auto Abbreviation",
description="Generate the abbreviation automatically",
default=True, update=label_changed)
bpy.utils.register_class(FaceList)
bpy.utils.register_class(IslandList)
class PaperModelSettings(bpy.types.PropertyGroup):
display_islands = bpy.props.BoolProperty(name="Highlight selected island",
description="Highlight faces corresponding to the selected island in the 3D View",
options={'SKIP_SAVE'}, update=display_islands_changed)
islands_alpha = bpy.props.FloatProperty(name="Opacity",
description="Opacity of island highlighting", min=0.0, max=1.0, default=0.3)
limit_by_page = bpy.props.BoolProperty(name="Limit Island Size",
description="Do not create islands larger than given dimensions", default=False)
output_size_x = bpy.props.FloatProperty(name="Width",
description="Maximal width of an island",
default=0.2, soft_min=0.105, soft_max=0.841, subtype="UNSIGNED", unit="LENGTH")
output_size_y = bpy.props.FloatProperty(name="Height",
description="Maximal height of an island",
default=0.29, soft_min=0.148, soft_max=1.189, subtype="UNSIGNED", unit="LENGTH")
scale = bpy.props.FloatProperty(name="Scale",
description="Divisor of all dimensions when exporting",
default=1, soft_min=1.0, soft_max=10000.0, subtype='UNSIGNED', precision=0)
do_ignore_errors = bpy.props.BoolProperty(name="Ignore Errors",
description="In case of geometry errors, take a less cautious approach. May produce incorrect output", default=False)
bpy.utils.register_class(PaperModelSettings)
def register():
bpy.utils.register_module(__name__)
bpy.types.Scene.paper_model = bpy.props.PointerProperty(type=PaperModelSettings,
name="Paper Model",
description="Settings of the Export Paper Model script",
options={'SKIP_SAVE'})
bpy.types.Mesh.paper_island_list = bpy.props.CollectionProperty(type=IslandList,
name="Island List", description="")
bpy.types.Mesh.paper_island_index = bpy.props.IntProperty(name="Island List Index",
default=-1, min=-1, max=100, options={'SKIP_SAVE'})
bpy.types.INFO_MT_file_export.append(menu_func)
def unregister():
bpy.utils.unregister_module(__name__)
bpy.types.INFO_MT_file_export.remove(menu_func)
if display_islands.handle:
bpy.types.SpaceView3D.draw_handler_remove(display_islands.handle, 'WINDOW')
display_islands.handle = None
if __name__ == "__main__":
register()