1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
# ##### BEGIN GPL LICENSE BLOCK #####
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ##### END GPL LICENSE BLOCK #####
# <pep8-80 compliant>
import bpy
# maybe we could also just use the svg exporter, import it again
# and render it. Unfortunately the svg importer does not work atm.
def export(filepath, face_data, colors, width, height, opacity):
aspect = width / height
# curves for lines
lines = curve_from_uvs(face_data, aspect, 1 / min(width, height))
lines_object = bpy.data.objects.new("temp_lines_object", lines)
black_material = make_colored_material((0, 0, 0))
lines.materials.append(black_material)
# background mesh
background_mesh = background_mesh_from_uvs(face_data, colors, aspect, opacity)
background_object = bpy.data.objects.new("temp_background_object", background_mesh)
background_object.location = (0, 0, -1)
# camera
camera = bpy.data.cameras.new("temp_camera")
camera_object = bpy.data.objects.new("temp_camera_object", camera)
camera.type = "ORTHO"
camera.ortho_scale = max(1, aspect)
camera_object.location = (aspect / 2, 0.5, 1)
camera_object.rotation_euler = (0, 0, 0)
# scene
scene = bpy.data.scenes.new("temp_scene")
scene.render.engine = "BLENDER_EEVEE"
scene.render.resolution_x = width
scene.render.resolution_y = height
scene.render.image_settings.color_mode = "RGBA"
scene.render.alpha_mode = "TRANSPARENT"
scene.render.filepath = filepath
# Link everything to the scene
scene.collection.objects.link(lines_object)
scene.collection.objects.link(camera_object)
scene.collection.objects.link(background_object)
scene.camera = camera_object
# Render
override = {"scene" : scene}
bpy.ops.render.render(override, write_still=True)
# Cleanup
bpy.data.objects.remove(lines_object)
bpy.data.objects.remove(camera_object)
bpy.data.objects.remove(background_object)
for material in background_mesh.materials:
bpy.data.materials.remove(material)
bpy.data.meshes.remove(background_mesh)
bpy.data.cameras.remove(camera)
bpy.data.curves.remove(lines)
bpy.data.materials.remove(black_material)
bpy.data.scenes.remove(scene)
def curve_from_uvs(face_data, aspect, thickness):
lines = bpy.data.curves.new("temp_curve", "CURVE")
lines.fill_mode = "BOTH"
lines.bevel_depth = thickness
lines.offset = -thickness / 2
lines.dimensions = "3D"
for uvs, _ in face_data:
for i in range(len(uvs)):
start = uvs[i]
end = uvs[(i+1) % len(uvs)]
spline = lines.splines.new("POLY")
# one point is already there
spline.points.add(count=1)
points = spline.points
points[0].co.x = start[0] * aspect
points[0].co.y = start[1]
points[1].co.x = end[0] * aspect
points[1].co.y = end[1]
return lines
def background_mesh_from_uvs(face_data, colors, aspect, opacity):
mesh = bpy.data.meshes.new("temp_background")
vertices = []
polygons = []
for uvs, _ in face_data:
polygon = []
for uv in uvs:
polygon.append(len(vertices))
vertices.append((uv[0] * aspect, uv[1], 0))
polygons.append(tuple(polygon))
mesh.from_pydata(vertices, [], polygons)
materials, material_index_by_color = make_polygon_background_materials(colors, opacity)
for material in materials:
mesh.materials.append(material)
for generated_polygon, (_, color) in zip(mesh.polygons, face_data):
generated_polygon.material_index = material_index_by_color[color]
mesh.update()
mesh.validate()
return mesh
def make_polygon_background_materials(colors, opacity=1):
materials = []
material_index_by_color = {}
for i, color in enumerate(colors):
material = make_colored_material(color, opacity)
materials.append(material)
material_index_by_color[color] = i
return materials, material_index_by_color
def make_colored_material(color, opacity=1):
material = bpy.data.materials.new("temp_material")
material.use_nodes = True
material.blend_method = "BLEND"
tree = material.node_tree
tree.nodes.clear()
output_node = tree.nodes.new("ShaderNodeOutputMaterial")
emission_node = tree.nodes.new("ShaderNodeEmission")
emission_node.inputs["Color"].default_value = [color[0], color[1], color[2], opacity]
tree.links.new(emission_node.outputs["Emission"], output_node.inputs["Surface"])
return material
|
