├── materials.blend
├── materials.blend1
├── example
    └── example.gds
├── .gitignore
├── saved
    └── example.txt
├── README.md
├── bpy_import_stls.py
├── BlendGDSII.py
└── LICENSE


/materials.blend:
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https://raw.githubusercontent.com/SwaggerNiels/BlenderGDSII/HEAD/materials.blend


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/materials.blend1:
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https://raw.githubusercontent.com/SwaggerNiels/BlenderGDSII/HEAD/materials.blend1


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/example/example.gds:
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https://raw.githubusercontent.com/SwaggerNiels/BlenderGDSII/HEAD/example/example.gds


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/.gitignore:
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1 | build/
2 | dist/
3 | tawab_example/
4 | builder.py
5 | BlendGDSII.spec
6 | *.stl
7 | *.blend1
8 | 


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/saved/example.txt:
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 1 | c:\Users\niels\OneDrive\OneDriveDocs\98_MSc\Thesis\Software\Scripts\BlendGDSII\example\example.gds
 2 | 1,83,SU8,100,500
 3 | 1,82,Gold,0,100
 4 | 1,15,Silicon,-100,0
 5 | 0,,Gold,,
 6 | 0,,Gold,,
 7 | 0,,Gold,,
 8 | 0,,Gold,,
 9 | 0,,Gold,,
10 | 0,,Gold,,
11 | 0,,Gold,,


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/README.md:
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 1 | # BlenderGDSII
 2 | If you want to have presentable 3D images of your microfabrication layout use this!
 3 | This is a GUI for opening GDSII files in Blender. 
 4 | 
 5 | What can it do?
 6 | - convert your layout to STL files
 7 |   - these can be deselected and selected for Blender
 8 | - open the stl files in Blender
 9 |   - add selected materials
10 |   - add selected thickness
11 |   - produce proper eevee-render settings
12 | - save sessions
13 | - load sessions
14 | - delete saved sessions
15 | 
16 | Works with most GDSII files produced in KLayout,L-Edit or similar software.
17 | 
18 | This GUI uses the gdsiistl built by Daniel Teal:
19 | https://github.com/dteal/gdsiistl
20 | 
21 | The beautiful tkinter GUI was customized by Tom Schimansky:
22 | https://github.com/TomSchimansky/CustomTkinter
23 | 
24 | All the code was integrated by Niels Burghoorn in this package:
25 | https://github.com/SwaggerNiels/BlenderGDSII
26 | 
27 | ## Interface
28 | This is the example layout that can be loaded directly:
29 | ![afbeelding](https://user-images.githubusercontent.com/58084010/175263984-996d2a40-8b61-4a52-95c7-0282d7732852.png)
30 | 
31 | ## Pictures
32 | ![afbeelding](https://user-images.githubusercontent.com/58084010/174489455-4d0cfcf6-16e2-4670-b9b5-32f207a9b131.png)
33 | 
34 | ## Installation
35 | Installation is very easy!
36 | 
37 | - Make sure you have Blender installed: https://www.blender.org
38 | - On this github page go to the Releases tab.
39 | - Here you can download the zip-file, unpack it, and run the BlendGDSII.exe
40 | ![afbeelding](https://user-images.githubusercontent.com/58084010/175270282-9b526233-3ab6-4981-9a9a-720d5ce65225.png)
41 | 


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/bpy_import_stls.py:
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  1 | r'''blender execute:
  2 | cd "C:\Program Files\Blender Foundation\Blender 3.1"
  3 | .\blender.exe --factory-startup -P "<PATH>\bpy_import_stls.py"
  4 | '''
  5 | 
  6 | import bpy
  7 | import glob
  8 | import mathutils
  9 | import sys
 10 | from random import random
 11 | import os
 12 | 
 13 | bpy.context.preferences.view.show_splash = False
 14 | 
 15 | RANDOM_MAT = 0
 16 | STD_thickness = 100 #[nm]
 17 | 
 18 | try:
 19 |     index = sys.argv.index('--') + 1
 20 | except ValueError:
 21 |     index = len(sys.argv)
 22 | argv = sys.argv[index:]
 23 | 
 24 | print(argv)
 25 | 
 26 | if len(argv) < 2:
 27 |     print("Error: Need path of the stl files")
 28 |     sys.exit(0)
 29 | stl_folder_path = argv[0]
 30 | material_blend_path = argv[1]
 31 | check_stack = argv[2]
 32 | layer_stack = argv[3]
 33 | material_stack = argv[4]
 34 | dimension_stack = argv[5]
 35 | 
 36 | glob_search = stl_folder_path + r'\*.stl'
 37 | print(f'Looking for stl files:\n{glob_search}')
 38 | stl_files = glob.glob(glob_search)
 39 | print(f'found: {stl_files}')
 40 | 
 41 | stl_checks = check_stack.split(',')
 42 | stl_checks = [0 if check=='' else 1 for check in stl_checks]
 43 | stl_layers = layer_stack.split(',')
 44 | stl_materials = material_stack.split(',')
 45 | stl_dimensions = dimension_stack.split(',')
 46 | stl_dimensions = [tuple(map(int,pair[1:-1].split(';'))) if pair!='(;)' else (0,STD_thickness) for pair in stl_dimensions]
 47 | 
 48 | #import materials
 49 | with bpy.data.libraries.load(material_blend_path, link=False) as (data_from, data_to):
 50 |     data_to.materials = data_from.materials
 51 | print('Materials imported')
 52 | 
 53 | def update_camera(camera, focus_point=mathutils.Vector((0.0, 0.0, 0.0)), distance=10.0):
 54 |     """
 55 |     Focus the camera to a focus point and place the camera at a specific distance from that
 56 |     focus point. The camera stays in a direct line with the focus point.
 57 | 
 58 |     :param camera: the camera object
 59 |     :type camera: bpy.types.object
 60 |     :param focus_point: the point to focus on (default=``mathutils.Vector((0.0, 0.0, 0.0))``)
 61 |     :type focus_point: mathutils.Vector
 62 |     :param distance: the distance to keep to the focus point (default=``10.0``)
 63 |     :type distance: float
 64 |     """
 65 |     looking_direction = camera.location - focus_point
 66 |     rot_quat = looking_direction.to_track_quat('Z', 'Y')
 67 | 
 68 |     camera.rotation_euler = rot_quat.to_euler()
 69 |     # Use * instead of @ for Blender <2.8
 70 |     camera.location = rot_quat @ mathutils.Vector((0.0, 0.0, distance))
 71 | 
 72 | bpy.data.objects['Cube'].select_set(True)
 73 | bpy.data.objects['Light'].select_set(True)
 74 | bpy.ops.object.delete(use_global=False)
 75 | 
 76 | for stl_check,stl_layer,stl_material,stl_dimension in zip(stl_checks,stl_layers,stl_materials,stl_dimensions):
 77 |     if stl_check:
 78 |         #find file
 79 |         filename = ''
 80 |         for f in [f for f in stl_files if f.endswith(f'_{stl_layer}.stl')]:
 81 |             filename = f
 82 |         
 83 |         if filename != '':
 84 |             print(f'Blender - Importing {filename}')
 85 |             obj = bpy.ops.import_mesh.stl(filepath=filename)
 86 |             obj_name = filename.replace('/','\\').split('\\')[-1][:-4]
 87 |             mat_name = obj_name + '_material'
 88 | 
 89 |             bpy.data.objects[obj_name].select_set(True)
 90 |             ob = bpy.context.active_object
 91 |             
 92 |             #apply material
 93 |             if RANDOM_MAT:
 94 |                 # Get material
 95 |                 mat = bpy.data.materials.new(name=mat_name)
 96 |                 mat.diffuse_color = random(), random(), random(), 1
 97 | 
 98 |                 # Assign it to object
 99 |                 if ob.data.materials:
100 |                     # assign to 1st material slot
101 |                     ob.data.materials[0] = mat
102 |                 else:
103 |                     # no slots
104 |                     ob.data.materials.append(mat)
105 |             else:
106 |                 mat = bpy.data.materials[stl_material]
107 |                 
108 |                 if ob.data.materials:
109 |                     # assign to 1st material slot
110 |                     ob.data.materials[0] = mat
111 |                 else:
112 |                     # no slots
113 |                     ob.data.materials.append(mat)
114 | 
115 |             #apply dimensions
116 |             lbound, ubound = stl_dimension #lower and upper bound
117 |             desired_thickness = ubound-lbound
118 | 
119 |             factor_z = desired_thickness/STD_thickness
120 |             bpy.ops.transform.resize(value=(1, 1, factor_z))
121 |             bpy.ops.transform.translate(value=(0, 0, lbound))
122 | 
123 |             bpy.data.objects[obj_name].select_set(False)
124 |         else:
125 |             print(f'Layer {stl_layer} not made yet, cant be used...')
126 |     else:
127 |         print(f'Layer {stl_layer} not imported')
128 | 
129 | bpy.ops.object.select_all(action='SELECT')
130 | bpy.data.objects['Camera'].select_set(False)
131 | 
132 | for area in bpy.context.screen.areas:
133 |     if area.type == 'VIEW_3D':
134 |         ctx = bpy.context.copy()
135 |         ctx['area'] = area
136 |         ctx['region'] = area.regions[-1]
137 |         
138 |         clip_start_value = 10
139 |         clip_end_value = 1e6
140 |         for s in area.spaces:
141 |             if s.type == 'VIEW_3D':
142 |                 s.clip_start = clip_start_value
143 |                 s.clip_end = clip_end_value
144 |                 s.shading.type = 'MATERIAL'
145 |                 # bpy.ops.image.open(filepath="C:\\Program Files\\Blender Foundation\\Blender 3.1\\3.1\\datafiles\\studiolights\\world\\forest.exr", directory="C:\\Program Files\\Blender Foundation\\Blender 3.1\\3.1\\datafiles\\studiolights\\world\\", files=[{"name":"forest.exr", "name":"forest.exr"}], show_multiview=False)
146 | 
147 |         bpy.data.objects['Camera'].data.clip_start = clip_start_value
148 |         bpy.data.objects['Camera'].data.clip_end = clip_end_value
149 | 
150 |         bpy.ops.view3d.view_selected(ctx)            # points view
151 |         bpy.ops.view3d.camera_to_view_selected(ctx)   # points camera
152 | 
153 | bpy.ops.object.light_add(type='SUN', align='WORLD', location=(0, 0, 0), rotation=(0.261799, 0.261799*2, 0), scale=(1, 1, 1))
154 | bpy.data.objects["Sun"].select_set(True)
155 | ob = bpy.context.active_object
156 | ob.data.energy = 5000
157 | bpy.data.objects["Sun"].select_set(False)
158 | 
159 | bpy.context.scene.eevee.use_ssr = True
160 | bpy.context.scene.eevee.use_ssr_refraction = True
161 | bpy.context.scene.render.film_transparent = True
162 | 
163 | 
164 | bpy.ops.object.select_all(action='DESELECT')
165 | 


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/BlendGDSII.py:
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  1 | from tkinter.filedialog import askopenfilename
  2 | 
  3 | #custom tkinter
  4 | import tkinter
  5 | from tkinter.ttk import Combobox
  6 | import tkinter.messagebox
  7 | import customtkinter
  8 | 
  9 | #gdsiistl
 10 | import sys # read command-line arguments
 11 | import gdspy # open gds file
 12 | import numpy as np # fast math on lots of points
 13 | from stl import mesh # write stl file (python package name is "numpy-stl")
 14 | import triangle # triangulate polygons
 15 | 
 16 | #call blender
 17 | import threading
 18 | import subprocess
 19 | 
 20 | #find newest blender.exe installation
 21 | import glob
 22 | def blender_path_search_function(pattern):
 23 |     return glob.glob(pattern)[-1]
 24 | 
 25 | DEFAULT_BLENDER_PATH_PATTERN = r'C:\Program Files\Blender Foundation\Blender*\blender.exe'
 26 | BLENDER_PATH = blender_path_search_function(DEFAULT_BLENDER_PATH_PATTERN)
 27 | 
 28 | #find my path
 29 | import os
 30 | MY_PATH = os.path.dirname(__file__)
 31 | 
 32 | with open(MY_PATH + '/saved/example.txt','w') as f:
 33 |     f.write(f'''{MY_PATH}\\example\\example.gds
 34 | 1,83,SU8,100,500
 35 | 1,82,Gold,0,100
 36 | 1,15,Silicon,-100,0
 37 | 0,,Gold,,
 38 | 0,,Gold,,
 39 | 0,,Gold,,
 40 | 0,,Gold,,
 41 | 0,,Gold,,
 42 | 0,,Gold,,
 43 | 0,,Gold,,''')
 44 | 
 45 | customtkinter.set_appearance_mode("System")  # Modes: "System" (standard), "Dark", "Light"
 46 | customtkinter.set_default_color_theme("blue")  # Themes: "blue" (standard), "green", "dark-blue"
 47 | 
 48 | def gdsiistl(gdsii_file_path, layerstack):
 49 |     ########## CONFIGURATION (EDIT THIS PART) #####################################
 50 | 
 51 |     # choose which GDSII layers to use
 52 |     ########## INPUT ##############################################################
 53 | 
 54 |     # First, the input file is read using the gdspy library, which interprets the
 55 |     # GDSII file and formats the data Python-style.
 56 |     # See https://gdspy.readthedocs.io/en/stable/index.html for documentation.
 57 |     # Second, the boundaries of each shape (polygon or path) are extracted for
 58 |     # further processing.
 59 | 
 60 |     print('Reading GDSII file {}...'.format(gdsii_file_path))
 61 |     gdsii = gdspy.GdsLibrary()
 62 |     gdsii.read_gds(gdsii_file_path, units='import')
 63 | 
 64 |     print('Extracting polygons...')
 65 |     layers = {} # array to hold all geometry, sorted into layers
 66 | 
 67 |     cells = gdsii.top_level() # get all cells that aren't referenced by another
 68 |     for cell in cells: # loop through cells to read paths and polygons
 69 | 
 70 |         # $$$CONTEXT_INFO$$$ is a separate, non-standard compliant cell added
 71 |         # optionally by KLayout to store extra information not needed here.
 72 |         # see https://www.klayout.de/forum/discussion/1026/very-
 73 |         # important-gds-exported-from-k-layout-not-working-on-cadence-at-foundry
 74 |         if cell.name == '$$$CONTEXT_INFO$$$':
 75 |             continue # skip this cell
 76 | 
 77 |         # combine will all referenced cells (instances, SREFs, AREFs, etc.)
 78 |         cell = cell.flatten()
 79 | 
 80 |         # loop through paths in cell
 81 |         for path in cell.paths:
 82 |             lnum = path.layers[0] # GDSII layer number
 83 |             # create empty array to hold layer polygons if it doesn't yet exist
 84 |             layers[lnum] = [] if not lnum in layers else layers[lnum]
 85 |             # add paths (converted to polygons) that layer
 86 |             for poly in path.get_polygons():
 87 |                 layers[lnum].append((poly, None, False))
 88 | 
 89 |         # loop through polygons (and boxes) in cell
 90 |         for polygon in cell.polygons:
 91 |             lnum = polygon.layers[0] # same as before...
 92 |             layers[lnum] = [] if not lnum in layers else layers[lnum]
 93 |             for poly in polygon.polygons:
 94 |                 layers[lnum].append((poly, None, False))
 95 | 
 96 |     """
 97 |     At this point, "layers" is a Python dictionary structured as follows:
 98 | 
 99 |     layers = {
100 |     0 : [ ([[x1, y1], [x2, y2], ...], None, False), ... ]
101 |     1 : [ ... ]
102 |     2 : [ ... ]
103 |     ...
104 |     }
105 | 
106 |     Each dictionary key is a GDSII layer number (0-255), and the value of the
107 |     dictionary at that key (if it exists; keys were only created for layers with
108 |     geometry) is a list of polygons in that GDSII layer. Each polygon is a 3-tuple
109 |     whose first element is a list of points (2-element lists with x and y
110 |     coordinates), second element is None (for the moment; this will be used later),
111 |     and third element is False (whether the polygon is clockwise; will be updated).
112 |     """
113 | 
114 |     ########## TRIANGULATION ######################################################
115 | 
116 |     # An STL file is a list of triangles, so the polygons need to be filled with
117 |     # triangles. This is a surprisingly hard algorithmic problem, especially since
118 |     # there are few limits on what shapes GDSII file polygons can be. So we use the
119 |     # Python triangle library (documentation is at https://rufat.be/triangle/),
120 |     # which is a Python interface to a fast and well-written C library also called
121 |     # triangle (with documentation at https://www.cs.cmu.edu/~quake/triangle.html).
122 | 
123 |     print('Triangulating polygons...')
124 | 
125 |     num_triangles = {} # will store the number of triangles for each layer
126 | 
127 |     # loop through all layers
128 |     for layer_number, polygons in layers.items():
129 | 
130 |         # but skip layer if it won't be exported
131 |         if not layer_number in layerstack.keys():
132 |             continue
133 | 
134 |         num_triangles[layer_number] = 0
135 | 
136 |         # loop through polygons in layer
137 |         for index, (polygon, _, _) in enumerate(polygons):
138 | 
139 |             num_polygon_points = len(polygon)
140 | 
141 |             # determine whether polygon points are CW or CCW
142 |             area = 0
143 |             for i, v1 in enumerate(polygon): # loop through vertices
144 |                 v2 = polygon[(i+1) % num_polygon_points]
145 |                 area += (v2[0]-v1[0])*(v2[1]+v1[1]) # integrate area
146 |             clockwise = area > 0
147 | 
148 |             # GDSII implements holes in polygons by making the polygon edge
149 |             # wrap into the hole and back out along the same line. However,
150 |             # this confuses the triangulation library, which fills the holes
151 |             # with extra triangles. Avoid this by moving each edge back a
152 |             # very small amount so that no two edges of the same polygon overlap.
153 |             delta = 0.01 # inset each vertex by this much (smaller has broken one file)
154 |             points_i = polygon # get list of points
155 |             points_j = np.roll(points_i, -1, axis=0) # shift by 1
156 |             points_k = np.roll(points_i, 1, axis=0) # shift by -1
157 |             # calculate normals for each edge of each vertex (in parallel, for speed)
158 |             normal_ij = np.stack((points_j[:, 1]-points_i[:, 1],
159 |                                 points_i[:, 0]-points_j[:, 0]), axis=1)
160 |             normal_ik = np.stack((points_i[:, 1]-points_k[:, 1],
161 |                                 points_k[:, 0]-points_i[:, 0]), axis=1)
162 |             length_ij = np.linalg.norm(normal_ij, axis=1)+0.00000001
163 |             length_ik = np.linalg.norm(normal_ik, axis=1)+0.00000001
164 |             normal_ij /= np.stack((length_ij, length_ij), axis=1)
165 |             normal_ik /= np.stack((length_ik, length_ik), axis=1)
166 |             if clockwise:
167 |                 normal_ij = -1*normal_ij
168 |                 normal_ik = -1*normal_ik
169 |             # move each vertex inward along its two edge normals
170 |             polygon = points_i - delta*normal_ij - delta*normal_ik
171 | 
172 |             # In an extreme case of the above, the polygon edge doubles back on
173 |             # itself on the same line, resulting in a zero-width segment. I've
174 |             # seen this happen, e.g., with a capital "N"-shaped hole, where
175 |             # the hole split line cuts out the "N" shape but splits apart to
176 |             # form the triangle cutout in one side of the shape. In any case,
177 |             # simply moving the polygon edges isn't enough to deal with this;
178 |             # we'll additionally mark points just outside of each edge, between
179 |             # the original edge and the delta-shifted edge, as outside the polygon.
180 |             # These parts will be removed from the triangulation, and this solves
181 |             # just this case with no adverse affects elsewhere.
182 |             hole_delta = 0.001 # small fraction of delta
183 |             holes = 0.5*(points_j+points_i) - hole_delta*delta*normal_ij
184 |             # HOWEVER: sometimes this causes a segmentation fault in the triangle
185 |             # library. I've observed this as a result of certain various polygons.
186 |             # Frustratingly, the fault can be bypassed by *rotating the polygons*
187 |             # by like 30 degrees (exact angle seems to depend on delta values) or
188 |             # moving one specific edge outward a bit. I have absolutely no idea
189 |             # what is wrong. In the interest of stability over full functionality,
190 |             # this is disabled. TODO: figure out why this happens and fix it.
191 |             use_holes = False
192 | 
193 |             # triangulate: compute triangles to fill polygon
194 |             point_array = np.arange(num_polygon_points)
195 |             edges = np.transpose(np.stack((point_array, np.roll(point_array, 1))))
196 |             if use_holes:
197 |                 triangles = triangle.triangulate(dict(vertices=polygon,
198 |                                                     segments=edges,
199 |                                                     holes=holes), opts='p')
200 |             else:
201 |                 triangles = triangle.triangulate(dict(vertices=polygon,
202 |                                                     segments=edges), opts='p')
203 | 
204 |             if not 'triangles' in triangles.keys():
205 |                 triangles['triangles'] = []
206 | 
207 |             # each line segment will make two triangles (for a rectangle), and the polygon
208 |             # triangulation will be copied on the top and bottom of the layer.
209 |             num_triangles[layer_number] += num_polygon_points*2 + \
210 |                                         len(triangles['triangles'])*2
211 |             polygons[index] = (polygon, triangles, clockwise)
212 | 
213 |     """
214 |     At this point, "layers" is as follows:
215 | 
216 |     layers = {
217 |     0 : [ ([[x1, y1], [x2, y2], ...],
218 |             {'vertices': [[x1, y1], ...], 'triangles': [[0, 1, 2], ...], ...},
219 |             clockwise), ... ]
220 |     1 : [ ... ]
221 |     2 : [ ... ]
222 |     ...
223 |     }
224 | 
225 |     Each dictionary key is a GDSII layer number (0-255), and the value of the
226 |     dictionary at that key (if it exists; keys were only created for layers with
227 |     geometry) is a list of polygons in that GDSII layer. Each polygon has 3 parts:
228 |     First, a list of vertices, as before. Second, a dictionary with triangulation
229 |     information: the 'vertices' element contains vertex information stored the
230 |     same way as the main polygon vertices, and the 'triangles' element is a list
231 |     of which vertices correspond to which triangle (in counterclockwise order).
232 |     Third and finally, a boolean value that indicates whether the polygon was
233 |     defined clockwise (so that the STL triangles are oriented correctly).
234 |     """
235 | 
236 |     ########## EXTRUSION ##########################################################
237 | 
238 |     # Finally, now that we have polygon boundaries and triangulations, we can
239 |     # write it to an STL file. To make this fast (given there could be tens of
240 |     # thousands of triangles), we use the numpy-stl library, which uses numpy
241 |     # for somewhat accelerated vector math. See the documentation at
242 |     # (https://numpy-stl.readthedocs.io/en/latest/)
243 | 
244 |     print('Extruding polygons and writing to files...')
245 | 
246 |     # loop through all layers
247 |     for layer in layers:
248 | 
249 |         # but skip layer if it won't be exported
250 |         if not layer in layerstack.keys():
251 |             continue
252 | 
253 |         # Make a list of triangles.
254 |         # This data contains vertex xyz position data as follows:
255 |         # layer_mesh_data['vectors'] = [ [[x1,y1,z1], [x2,y2,z1], [x3,y3,z3]], ...]
256 |         layer_mesh_data = np.zeros(num_triangles[layer], dtype=mesh.Mesh.dtype)
257 | 
258 |         layer_pointer = 0
259 |         for index, (polygon, triangles, clockwise) in enumerate(layers[layer]):
260 | 
261 |             # The numpy-stl library expects counterclockwise triangles. That is,
262 |             # one side of each triangle is the outside surface of the STL file
263 |             # object (assuming a watertight volume), and the other side is the
264 |             # inside surface. If looking at a triangle from the outside, the
265 |             # vertices should be in counterclockwise order. Failure to do so may
266 |             # cause certain STL file display programs to not display the
267 |             # triangles correctly (e.g., the backward triangles will be invisible).
268 | 
269 |             zmin, zmax, layername = layerstack[layer]
270 | 
271 |             # make a list of triangles around the polygon boundary
272 |             points_i = polygon # list of 2D vertices
273 |             if clockwise: # order polygon 2D vertices counter-clockwise
274 |                 points_i = np.flip(polygon, axis=0)
275 |             points_i_min = np.insert(points_i, 2, zmin, axis=1) # bottom left
276 |             points_i_max = np.insert(points_i, 2, zmax, axis=1) # top left
277 |             points_j_min = np.roll(points_i_min, -1, axis=0) # bottom right
278 |             points_j_max = np.roll(points_i_max, -1, axis=0) # top right
279 |             rights = np.stack((points_i_min, points_j_min, points_j_max), axis=1)
280 |             lefts = np.stack((points_j_max, points_i_max, points_i_min), axis=1)
281 | 
282 |             # make a list of polygon interior (face) triangles
283 |             vs = triangles['vertices']
284 |             ts = triangles['triangles']
285 |             if len(ts) > 0:
286 |                 face_tris = np.take(vs, ts, axis=0)
287 |                 top = np.insert(face_tris, 2, zmax, axis=2) # list of top triangles
288 |                 bottom = np.insert(face_tris, 2, zmin, axis=2) # list of bottom ~
289 |                 bottom = np.flip(bottom, axis=1) # reverse vertex order to make CCW
290 |                 faces = np.concatenate((lefts, rights, top, bottom), axis=0)
291 |             else: # didn't generate any triangles! (degenerate edge case)
292 |                 faces = np.concatenate((lefts, rights), axis=0)
293 | 
294 |             # add side and face triangles to layer mesh
295 |             layer_mesh_data['vectors'][layer_pointer:(layer_pointer+len(faces))] = faces
296 |             layer_pointer += len(faces)
297 | 
298 |         # save layer to STL file
299 |         empty_file_path = '\\'.join(gdsii_file_path.replace('/','\\').split('\\')[:-1]) + '\\'
300 |         filename = empty_file_path.replace('.','_') + f'{layername}.stl'
301 |         print('    ({}, {}) to {}'.format(layer, layername, filename))
302 |         layer_mesh_object = mesh.Mesh(layer_mesh_data, remove_empty_areas=False)
303 |         layer_mesh_object.save(filename)
304 | 
305 |     print('Done.')
306 | 
307 | class App(customtkinter.CTk):
308 | 
309 |     WIDTH = 780
310 |     HEIGHT = 780
311 |     lb = list(range(10))
312 |     gdsii_file_path = ''
313 |     selected_blender_path = BLENDER_PATH
314 | 
315 |     material_options = [
316 |         'Gold',
317 |         'Aluminum',
318 |         'Silicon',
319 |         'Silicon Dioxide',
320 |         'Silicon Nitrate',
321 |         'Polysilicon',
322 |         'Molybdenum',
323 |         'Copper',
324 |         'PP',
325 |         'SU8',
326 |         'Water',
327 |         'Red',
328 |         'Blue',
329 |         'Green',
330 |         'Yellow',
331 |         'Pink',
332 |         'Cyan',
333 |     ]
334 | 
335 |     def __init__(self):
336 |         super().__init__()
337 | 
338 |         self.title("BlendGDSII - layout to blender")
339 |         self.geometry(f"{App.WIDTH}x{App.HEIGHT}")
340 |         self.protocol("WM_DELETE_WINDOW", self.on_closing)  # call .on_closing() when app gets closed
341 | 
342 |         # ============ create two frames ============
343 | 
344 |         # configure grid layout (2x1)
345 |         self.grid_columnconfigure(1, weight=1)
346 |         self.grid_rowconfigure(0, weight=1)
347 | 
348 |         self.frame_left = customtkinter.CTkFrame(master=self,
349 |                                                  width=180,
350 |                                                  corner_radius=0)
351 |         self.frame_left.grid(row=0, column=0, sticky="nswe")
352 | 
353 |         self.frame_right = customtkinter.CTkFrame(master=self)
354 |         self.frame_right.grid(row=0, column=1, sticky="nswe", padx=20, pady=20)
355 |         
356 |         # ============ frame_left ============
357 | 
358 |         # configure grid layout (1x11)
359 |         self.frame_left.grid_rowconfigure(tuple(range(11)), minsize=10)   # empty row with minsize as spacing
360 | 
361 |         self.label_1 = customtkinter.CTkLabel(master=self.frame_left,
362 |                                               text="BlendGDSII\nlayout to blender",
363 |                                               text_font=("Roboto Medium", -16))  # font name and size in px
364 |         self.label_1.grid(row=1, column=0, pady=10, padx=10)
365 | 
366 |         #Convert button
367 |         self.button_1 = customtkinter.CTkButton(master=self.frame_left,
368 |                                                 text="Convert\n\nGDSII to STL files",
369 |                                                 fg_color=("gray75", "gray30"),  # <- custom tuple-color
370 |                                                 command=self.make_stls)
371 |         self.button_1.grid(row=2, column=0, pady=10, padx=20)
372 | 
373 |         #Open button
374 |         self.button_2 = customtkinter.CTkButton(master=self.frame_left,
375 |                                                 text="Open\n\nSTL files in Blender",
376 |                                                 fg_color=("gray75", "gray30"),  # <- custom tuple-color
377 |                                                 command=self.open_blender)
378 |         self.button_2.grid(row=3, column=0, pady=10, padx=20)
379 |         
380 |         #Load button
381 |         self.button_3 = customtkinter.CTkButton(master=self.frame_left,
382 |                                                 text="Load\n\nGDSII configuration",
383 |                                                 fg_color=("gray75", "gray30"),  # <- custom tuple-color
384 |                                                 command=self.load)
385 |         self.button_3.grid(row=4, column=0, pady=10, padx=20)
386 |         
387 |         #Save button
388 |         self.button_4 = customtkinter.CTkButton(master=self.frame_left,
389 |                                                 text="Save\n\nGDSII configuration",
390 |                                                 fg_color=("gray75", "gray30"),  # <- custom tuple-color
391 |                                                 command=self.save)
392 |         self.button_4.grid(row=5, column=0, pady=10, padx=20)
393 |         
394 |         #Change path button
395 |         self.button_5 = customtkinter.CTkButton(master=self.frame_left,
396 |                                                 text="Change\n\nBlender path",
397 |                                                 fg_color=("gray75", "gray30"),  # <- custom tuple-color
398 |                                                 command=self.change_blender_path)
399 |         self.button_5.grid(row=6, column=0, pady=10, padx=20)
400 |         
401 |         #Test button
402 |         # self.button_5 = customtkinter.CTkButton(master=self.frame_left,
403 |         #                                         text="Testing\n\nView GDSII file",
404 |         #                                         fg_color=("gray75", "gray30"),  # <- custom tuple-color
405 |         #                                         command=self.testing)
406 |         # self.button_5.grid(row=6, column=0, pady=10, padx=20)
407 | 
408 |         self.switch_2 = customtkinter.CTkSwitch(master=self.frame_left,
409 |                                                 text="Dark Mode",
410 |                                                 command=self.change_mode)
411 |         self.switch_2.grid(row=10, column=0, pady=10, padx=20, sticky="w")
412 | 
413 |         # ============ frame_right ============
414 | 
415 |         # configure grid layout (3x12)
416 |         self.frame_right.rowconfigure(0, weight=10)
417 |         self.frame_right.rowconfigure(1, weight=5)
418 |         self.frame_right.rowconfigure(tuple(range(2,2+len(self.lb))), weight=2)
419 |         self.frame_right.columnconfigure(0, weight=1)
420 |         self.frame_right.columnconfigure(1, weight=4)
421 |         self.frame_right.columnconfigure(2, weight=4)
422 |         self.frame_right.columnconfigure(3, weight=2)
423 |         self.frame_right.columnconfigure(4, weight=2)
424 | 
425 |         self.label_info = customtkinter.CTkLabel(master=self.frame_right,
426 |                                                    text="Click the blue button below to select the GDSII file\n"+
427 |                                                        "Use the rows below the button to select the GDSII-layers that you want.\n" +
428 |                                                        "Each row: Check the box, write GDSII-layer number, specify material, set top and bottom\n" +
429 |                                                        "Click the blue button on the left 'Convert' to convert your layers to 3D\n" +
430 |                                                         "Wait a moment to convert...\n" +
431 |                                                         "Now you can open Blender by pressing the 'Open' button on the left.\n" +
432 |                                                         "Wait a moment to import... (can take some time for detailed layout)" ,
433 |                                                    height=100,
434 |                                                    fg_color=("white", "gray38"),  # <- custom tuple-color
435 |                                                    justify=tkinter.LEFT)
436 |         self.label_info.grid(column=0, row=0, columnspan=5, sticky="nwe", padx=15, pady=15)
437 |         
438 |         self.gdsii_file_path_button = customtkinter.CTkButton(master=self.frame_right,
439 |                                                 text="Select GDSII file here",
440 |                                                 command=self.open_gds,
441 |                                                 height=50)
442 |         self.gdsii_file_path_button.grid(row=1, column=0, columnspan=5, pady=20, padx=20, sticky="we")
443 | 
444 |         #Layer button (layer button checkbox, layer button entry)
445 |         for i in range(len(self.lb)):
446 |             self.lb[i] = self.make_gds_layer_button(i)
447 | 
448 |         self.switch_2.select()
449 | 
450 |     def save(self):
451 |         # save configuration
452 |         self.win = customtkinter.CTkToplevel()
453 |         self.win.wm_title("Save this configuration")
454 | 
455 |         self.save_name_entry = customtkinter.CTkEntry(master=self.win,
456 |             placeholder_text="configuration name")
457 |         self.save_name_entry.grid(row=0, column=0, pady=20, padx=20, sticky="n")
458 | 
459 |         b = customtkinter.CTkButton(self.win, text="Save", command=self.save_file)
460 |         b.grid(row=1, column=0)
461 |     
462 |     def save_file(self):
463 |         save_path = MY_PATH+r'/saved'+'//'+self.save_name_entry.get()+'.txt'
464 |         self.setget_data() #retrieve info from gui into data and data_string
465 | 
466 |         save_data = [self.gdsii_file_path, self.data_string]
467 |         save_prompt = '\n'.join(save_data)
468 |         
469 |         with open(save_path,'w') as f:
470 |             f.write(save_prompt)
471 | 
472 |         print(f'Saved to {save_path}:\n{save_prompt}')
473 |         self.win.destroy()
474 | 
475 |     def load(self):
476 |         # find saved configurations
477 |         saves = glob.glob(MY_PATH+r'/saved/*.txt')
478 |         print(f'Found save files:\n{saves}')
479 |         if len(saves) > 0:
480 |             self.win = customtkinter.CTkToplevel()
481 |             self.win.wm_title("Load previous configuration")
482 | 
483 |             l = customtkinter.CTkLabel(self.win, text="Load save")
484 |             l.grid(row=0, column=0, pady=20, padx=20, sticky="n")
485 | 
486 |             b = customtkinter.CTkButton(self.win, text="Back", command=self.win.destroy)
487 |             b.grid(row=1, column=0, pady=20, padx=20, sticky="n")
488 | 
489 |             for i,save in enumerate(saves):
490 |                 c=customtkinter.CTkButton(self.win, text=save)
491 |                 c.grid(row=i+2, column=0, pady=10, padx=20, sticky="n")
492 |                 c.configure(command=lambda save = save: self.load_file(save))
493 |                 
494 |                 d = customtkinter.CTkButton(self.win, text='delete')
495 |                 d.grid(row=i+2, column=1, pady=10, padx=5, sticky="n")
496 |                 d.configure(command=lambda c=c, d=d, save=save: self.remove_file(c,d,save))
497 | 
498 |     def load_file(self,save):
499 |         print(f'SETTING: {save}')
500 |         with open(save, 'r') as f:
501 |             lines = f.read().split('\n')
502 |             if len(lines) > 0:
503 |                 print(lines)
504 |                 self.gdsii_file_path = lines[0]
505 |                 self.setget_data(data_string = '\n'.join(lines[1:]))
506 | 
507 |                 load_prompt = self.data_string
508 |                 print(f'Set configuration:\n{save}\n{load_prompt}')
509 |             else:
510 |                 print('This configuration is empty, please delete it')
511 | 
512 |         self.set_gds_button_text(self.gdsii_file_path)
513 |         self.win.destroy()
514 | 
515 |     def remove_file(self,c,d,save):
516 |         c.destroy()
517 |         d.destroy()
518 | 
519 |         os.remove(save)
520 | 
521 |     def make_gds_layer_button(self,row_i):
522 |         #checkbox (active)
523 |         check = tkinter.IntVar(self.frame_right)
524 |         layer_button_check = customtkinter.CTkCheckBox(master=self.frame_right,
525 |                                                            text='',variable=check)
526 |         layer_button_check.grid(row=row_i+2, column=0, pady=10, padx=5, sticky="n")
527 |         
528 |         #entry (gds_layer)
529 |         entry_var = tkinter.StringVar(self.frame_right)
530 |         entry = customtkinter.CTkEntry(master=self.frame_right,
531 |                                                            placeholder_text="GDSII-layer",)
532 |                                                         #    textvariable = entry_var)
533 |         entry.grid(row=row_i+2, column=1, pady=10, padx=5, sticky="n")
534 | 
535 |         #option (material)
536 |         material = tkinter.StringVar(self.frame_right)
537 |         material.set(self.material_options[0])
538 |         layer_button_option = customtkinter.CTkComboBox(master = self.frame_right,
539 |                                     variable = material,values = self.material_options)
540 |         layer_button_option.grid(row=row_i+2, column=2, pady=10, padx=20, sticky="n")
541 |         
542 |         #limits (dimensions) - lower bound and upper bound
543 |         lbound_var = tkinter.StringVar(self.frame_right)
544 |         lbound = customtkinter.CTkEntry(master=self.frame_right,
545 |                                                            placeholder_text="Bottom height [nm]",)
546 |                                                         #    textvariable = lbound_var)
547 |         lbound.grid(row=row_i+2, column=3, pady=10, padx=5, sticky="n")
548 |         
549 |         ubound_var = tkinter.StringVar(self.frame_right)
550 |         ubound = customtkinter.CTkEntry(master=self.frame_right,
551 |                                                            placeholder_text="Top height [nm]",)
552 |                                                         #    textvariable = ubound_var)
553 |         ubound.grid(row=row_i+2, column=4, pady=10, padx=5, sticky="n")
554 |         
555 |         return(check,entry,material,lbound,ubound)
556 | 
557 |     def open_gds(self):
558 |         filePath = askopenfilename(
559 |             initialdir='C:/', title='Select a File', filetype=(("GDSII File", ".gds"), ("All Files", "*.*")))
560 |         with open(filePath, 'rb') as askedFile:
561 |             fileContents = askedFile.read()
562 |         self.gdsii_file_path = filePath
563 | 
564 |         self.set_gds_button_text(filePath)
565 |     
566 |     def set_gds_button_text(self, filePath):
567 |         n = 80
568 |         path_strs = [str(filePath)[i:i+n] for i in range(0, len(str(filePath)), n)]
569 |         button_text = '\n'.join(path_strs)
570 | 
571 |         self.gdsii_file_path_button.configure(text = button_text)
572 |         print(f'Found: {filePath}')
573 | 
574 |     def change_mode(self):
575 |         if self.switch_2.get() == 1:
576 |             customtkinter.set_appearance_mode("dark")
577 |         else:
578 |             customtkinter.set_appearance_mode("light")
579 | 
580 |     def setentry(self,e,text):
581 |         e.delete(0,tkinter.END)
582 |         e.insert(0,text)
583 |         e.set_placeholder()
584 |         return
585 | 
586 |     def setget_data(self, data = [], data_string = ''):
587 |         #SET
588 |         if data != []:
589 |             print(data)
590 |             #set values in gui from data
591 |             for b,d in zip(self.lb,data):
592 |                 check,entry,material,lbound,ubound = b
593 |                 print(d)
594 |                 chset,enset,materset,lboset,uboset = d
595 |                 
596 |                 check.set(int(chset))
597 |                 self.setentry(entry,enset)
598 |                 material.set(materset)
599 |                 self.setentry(lbound,lboset)
600 |                 self.setentry(ubound,uboset)
601 |         elif data_string != '':
602 |             print(data_string)
603 |             #set values in gui from string
604 |             data_lines = data_string.split('\n')
605 |             for b,d in zip(self.lb,data_lines):
606 |                 check,entry,material,lbound,ubound = b
607 |                 print(d)
608 |                 chset,enset,materset,lboset,uboset = d.split(',')
609 |                 
610 |                 check.set(int(chset))
611 |                 self.setentry(entry,enset)
612 |                 material.set(materset)
613 |                 self.setentry(lbound,lboset)
614 |                 self.setentry(ubound,uboset)
615 |         
616 |         #GET
617 |         #get values in gui to data and string
618 |         data = []
619 |         for b in self.lb:
620 |             check,entry,material,lbound,ubound = b
621 |             data.append([
622 |                 check.get(),
623 |                 entry.get(),
624 |                 material.get(),
625 |                 lbound.get(),
626 |                 ubound.get(),
627 |                 ])
628 |         
629 |         data_string = '\n'.join([','.join(map(str,row)) for row in data])
630 |         
631 |         self.update()
632 |         
633 |         self.data = data
634 |         self.data_string = data_string
635 | 
636 |     def make_stls(self):
637 |         #Check which layers are needed and write according dictionary
638 |         layerstack = {}
639 |         
640 |         for b in self.lb:
641 |             check,entry,material,lbound,ubound = b
642 |             
643 |             active = check.get()
644 |             
645 |             #input checks
646 |             if active:
647 |                 layer = int(entry.get())
648 |                 layerstack[layer] = (0,100,f'gdsii_{layer}')
649 | 
650 |         gdsii_file_path = self.gdsii_file_path_button.text.replace('\n','')
651 | 
652 |         print(f'Building stl files...')
653 |         print(layerstack)
654 |         gdsiistl(gdsii_file_path,layerstack)
655 |         
656 |     def open_blender(self):
657 |         gdsii_file_path = self.gdsii_file_path_button.text.replace('\n','')
658 |         stl_folder = '\\'.join(gdsii_file_path.replace('/','\\').split('\\')[:-1])
659 |         print(stl_folder)
660 | 
661 |         cmd = [
662 |             self.selected_blender_path,
663 |             '--factory-startup',
664 |             '-P',
665 |             MY_PATH + r'\bpy_import_stls.py',
666 |             '--',
667 |             stl_folder,
668 |             MY_PATH + r'\materials.blend',
669 |             ','.join([str(check.get()) for check,_,_,_,_ in self.lb][::-1]),
670 |             ','.join([entry.get() for _,entry,_,_,_ in self.lb][::-1]),
671 |             ','.join([material.get() for _,_,material,_,_ in self.lb][::-1]),
672 |             ','.join([f'({lbound.get()};{ubound.get()})' for _,_,_,lbound,ubound in self.lb][::-1]),
673 |         ]
674 |         print(cmd)
675 |         blender_call = lambda cmd=cmd : subprocess.call(cmd, shell=False)
676 | 
677 |         t = threading.Thread(target=blender_call)
678 |         t.daemon = True # close pipe if GUI process exits
679 |         t.start()
680 | 
681 |     def on_closing(self, event=0):
682 |         self.destroy()
683 | 
684 |     def change_blender_path(self, event=None):
685 |         self.blender_path_win = customtkinter.CTkToplevel()
686 |         self.blender_path_win.wm_title("Change the Blender path")
687 | 
688 |         line1 = 'Adapt the blender path here'
689 |         line2 = 'You may use the * symbol for any arbitrary piece in the path.'
690 |         line3 = 'For instance use this to select the last version of Blender:' 
691 |         
692 |         self.label_blender_path_descr = customtkinter.CTkLabel(master=self.blender_path_win,
693 |                                               text=f"{line1}\n{line2}\n{line3}",
694 |                                               text_font=("Roboto Medium", -14))  # font name and size in px
695 |         self.label_blender_path_descr.grid(row=0, column=0, pady=10, padx=10)
696 |         
697 |         self.label_blender_path = customtkinter.CTkLabel(master=self.blender_path_win,
698 |                                               text=r'e.g.: "C:\Program Files\Blender Foundation\Blender*\blender.exe"',
699 |                                               text_font=("Roboto Medium", -12))  # font name and size in px
700 |         self.label_blender_path.grid(row=1, column=0, pady=10, padx=10)
701 |         
702 |         self.blender_path_entry = customtkinter.CTkEntry(master=self.blender_path_win,
703 |             placeholder_text=r'C:\Program Files\Blender Foundation\Blender*\blender.exe',
704 |             width=500)
705 |         self.blender_path_entry.grid(row=2, column=0, pady=0, padx=0, sticky="n")
706 | 
707 |         b = customtkinter.CTkButton(self.blender_path_win, text="Check", command=self.check_blender_path)
708 |         b.grid(row=3, column=0)
709 |         b = customtkinter.CTkButton(self.blender_path_win, text="Save", command=self.save_blender_path)
710 |         b.grid(row=4, column=0)
711 |         
712 |     def check_blender_path(self):
713 |         try:
714 |             checking_blender_path_pattern = self.blender_path_entry.get()
715 |             if not checking_blender_path_pattern.endswith('blender.exe'):
716 |                 self.label_blender_path.configure(text='Please include the "blender.exe" at the end of the path.')
717 |             else:
718 |                 checking_blender_path = blender_path_search_function(checking_blender_path_pattern)
719 |                 
720 |                 self.label_blender_path.configure(text=f'Your new Blender path would be:\n{checking_blender_path}\nPlease save to confirm.')
721 |         except:
722 |             self.label_blender_path.configure(text='This path is not valid...')
723 |         
724 |     def save_blender_path(self):
725 |         try:
726 |             selected_blender_path_pattern = self.blender_path_entry.get()
727 |             if not selected_blender_path_pattern.endswith('blender.exe'):
728 |                 self.label_blender_path.configure(text='Please include the "blender.exe" at the end of the path.')
729 |             else:
730 |                 self.selected_blender_path = blender_path_search_function(selected_blender_path_pattern)
731 | 
732 |                 print(f'Blender path changed to:\n{self.selected_blender_path}')
733 |                 self.blender_path_win.destroy()
734 |         except:
735 |             self.label_blender_path.configure(text='This path is not valid...')
736 | 
737 |     def testing(self):
738 |         # print(f'Reading GDSII file {self.gdsii_file_path}...')
739 |         # gdsii = gdspy.GdsLibrary()
740 |         # gdsii.read_gds(self.gdsii_file_path, units='import')
741 |         # print(gdsii.cells)
742 |         
743 |         self.setget_data()
744 |         print(self.data)
745 |         print(self.data_string)
746 |         
747 | 
748 | if __name__ == "__main__":
749 |     app = App()
750 |     app.mainloop()
751 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
  1 |                     GNU GENERAL PUBLIC LICENSE
  2 |                        Version 3, 29 June 2007
  3 | 
  4 |  Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
  5 |  Everyone is permitted to copy and distribute verbatim copies
  6 |  of this license document, but changing it is not allowed.
  7 | 
  8 |                             Preamble
  9 | 
 10 |   The GNU General Public License is a free, copyleft license for
 11 | software and other kinds of works.
 12 | 
 13 |   The licenses for most software and other practical works are designed
 14 | to take away your freedom to share and change the works.  By contrast,
 15 | the GNU General Public License is intended to guarantee your freedom to
 16 | share and change all versions of a program--to make sure it remains free
 17 | software for all its users.  We, the Free Software Foundation, use the
 18 | GNU General Public License for most of our software; it applies also to
 19 | any other work released this way by its authors.  You can apply it to
 20 | your programs, too.
 21 | 
 22 |   When we speak of free software, we are referring to freedom, not
 23 | price.  Our General Public Licenses are designed to make sure that you
 24 | have the freedom to distribute copies of free software (and charge for
 25 | them if you wish), that you receive source code or can get it if you
 26 | want it, that you can change the software or use pieces of it in new
 27 | free programs, and that you know you can do these things.
 28 | 
 29 |   To protect your rights, we need to prevent others from denying you
 30 | these rights or asking you to surrender the rights.  Therefore, you have
 31 | certain responsibilities if you distribute copies of the software, or if
 32 | you modify it: responsibilities to respect the freedom of others.
 33 | 
 34 |   For example, if you distribute copies of such a program, whether
 35 | gratis or for a fee, you must pass on to the recipients the same
 36 | freedoms that you received.  You must make sure that they, too, receive
 37 | or can get the source code.  And you must show them these terms so they
 38 | know their rights.
 39 | 
 40 |   Developers that use the GNU GPL protect your rights with two steps:
 41 | (1) assert copyright on the software, and (2) offer you this License
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235 |   A compilation of a covered work with other separate and independent
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245 |   6. Conveying Non-Source Forms.
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247 |   You may convey a covered work in object code form under the terms
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275 |     d) Convey the object code by offering access from a designated
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288 |     e) Convey the object code using peer-to-peer transmission, provided
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318 |   If you convey an object code work under this section in, or with, or
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342 | 
343 |   7. Additional Terms.
344 | 
345 |   "Additional permissions" are terms that supplement the terms of this
346 | License by making exceptions from one or more of its conditions.
347 | Additional permissions that are applicable to the entire Program shall
348 | be treated as though they were included in this License, to the extent
349 | that they are valid under applicable law.  If additional permissions
350 | apply only to part of the Program, that part may be used separately
351 | under those permissions, but the entire Program remains governed by
352 | this License without regard to the additional permissions.
353 | 
354 |   When you convey a copy of a covered work, you may at your option
355 | remove any additional permissions from that copy, or from any part of
356 | it.  (Additional permissions may be written to require their own
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361 |   Notwithstanding any other provision of this License, for material you
362 | add to a covered work, you may (if authorized by the copyright holders of
363 | that material) supplement the terms of this License with terms:
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365 |     a) Disclaiming warranty or limiting liability differently from the
366 |     terms of sections 15 and 16 of this License; or
367 | 
368 |     b) Requiring preservation of specified reasonable legal notices or
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372 |     c) Prohibiting misrepresentation of the origin of that material, or
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388 |   All other non-permissive additional terms are considered "further
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390 | received it, or any part of it, contains a notice stating that it is
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393 | a further restriction but permits relicensing or conveying under this
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406 | 
407 |   8. Termination.
408 | 
409 |   You may not propagate or modify a covered work except as expressly
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411 | modify it is void, and will automatically terminate your rights under
412 | this License (including any patent licenses granted under the third
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414 | 
415 |   However, if you cease all violation of this License, then your
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421 | 
422 |   Moreover, your license from a particular copyright holder is
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425 | received notice of violation of this License (for any work) from that
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427 | your receipt of the notice.
428 | 
429 |   Termination of your rights under this section does not terminate the
430 | licenses of parties who have received copies or rights from you under
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432 | reinstated, you do not qualify to receive new licenses for the same
433 | material under section 10.
434 | 
435 |   9. Acceptance Not Required for Having Copies.
436 | 
437 |   You are not required to accept this License in order to receive or
438 | run a copy of the Program.  Ancillary propagation of a covered work
439 | occurring solely as a consequence of using peer-to-peer transmission
440 | to receive a copy likewise does not require acceptance.  However,
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443 | not accept this License.  Therefore, by modifying or propagating a
444 | covered work, you indicate your acceptance of this License to do so.
445 | 
446 |   10. Automatic Licensing of Downstream Recipients.
447 | 
448 |   Each time you convey a covered work, the recipient automatically
449 | receives a license from the original licensors, to run, modify and
450 | propagate that work, subject to this License.  You are not responsible
451 | for enforcing compliance by third parties with this License.
452 | 
453 |   An "entity transaction" is a transaction transferring control of an
454 | organization, or substantially all assets of one, or subdividing an
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456 | work results from an entity transaction, each party to that
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462 | 
463 |   You may not impose any further restrictions on the exercise of the
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467 | (including a cross-claim or counterclaim in a lawsuit) alleging that
468 | any patent claim is infringed by making, using, selling, offering for
469 | sale, or importing the Program or any portion of it.
470 | 
471 |   11. Patents.
472 | 
473 |   A "contributor" is a copyright holder who authorizes use under this
474 | License of the Program or a work on which the Program is based.  The
475 | work thus licensed is called the contributor's "contributor version".
476 | 
477 |   A contributor's "essential patent claims" are all patent claims
478 | owned or controlled by the contributor, whether already acquired or
479 | hereafter acquired, that would be infringed by some manner, permitted
480 | by this License, of making, using, or selling its contributor version,
481 | but do not include claims that would be infringed only as a
482 | consequence of further modification of the contributor version.  For
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484 | patent sublicenses in a manner consistent with the requirements of
485 | this License.
486 | 
487 |   Each contributor grants you a non-exclusive, worldwide, royalty-free
488 | patent license under the contributor's essential patent claims, to
489 | make, use, sell, offer for sale, import and otherwise run, modify and
490 | propagate the contents of its contributor version.
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492 |   In the following three paragraphs, a "patent license" is any express
493 | agreement or commitment, however denominated, not to enforce a patent
494 | (such as an express permission to practice a patent or covenant not to
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497 | patent against the party.
498 | 
499 |   If you convey a covered work, knowingly relying on a patent license,
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503 | then you must either (1) cause the Corresponding Source to be so
504 | available, or (2) arrange to deprive yourself of the benefit of the
505 | patent license for this particular work, or (3) arrange, in a manner
506 | consistent with the requirements of this License, to extend the patent
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508 | actual knowledge that, but for the patent license, your conveying the
509 | covered work in a country, or your recipient's use of the covered work
510 | in a country, would infringe one or more identifiable patents in that
511 | country that you have reason to believe are valid.
512 | 
513 |   If, pursuant to or in connection with a single transaction or
514 | arrangement, you convey, or propagate by procuring conveyance of, a
515 | covered work, and grant a patent license to some of the parties
516 | receiving the covered work authorizing them to use, propagate, modify
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518 | you grant is automatically extended to all recipients of the covered
519 | work and works based on it.
520 | 
521 |   A patent license is "discriminatory" if it does not include within
522 | the scope of its coverage, prohibits the exercise of, or is
523 | conditioned on the non-exercise of one or more of the rights that are
524 | specifically granted under this License.  You may not convey a covered
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526 | in the business of distributing software, under which you make payment
527 | to the third party based on the extent of your activity of conveying
528 | the work, and under which the third party grants, to any of the
529 | parties who would receive the covered work from you, a discriminatory
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533 | contain the covered work, unless you entered into that arrangement,
534 | or that patent license was granted, prior to 28 March 2007.
535 | 
536 |   Nothing in this License shall be construed as excluding or limiting
537 | any implied license or other defenses to infringement that may
538 | otherwise be available to you under applicable patent law.
539 | 
540 |   12. No Surrender of Others' Freedom.
541 | 
542 |   If conditions are imposed on you (whether by court order, agreement or
543 | otherwise) that contradict the conditions of this License, they do not
544 | excuse you from the conditions of this License.  If you cannot convey a
545 | covered work so as to satisfy simultaneously your obligations under this
546 | License and any other pertinent obligations, then as a consequence you may
547 | not convey it at all.  For example, if you agree to terms that obligate you
548 | to collect a royalty for further conveying from those to whom you convey
549 | the Program, the only way you could satisfy both those terms and this
550 | License would be to refrain entirely from conveying the Program.
551 | 
552 |   13. Use with the GNU Affero General Public License.
553 | 
554 |   Notwithstanding any other provision of this License, you have
555 | permission to link or combine any covered work with a work licensed
556 | under version 3 of the GNU Affero General Public License into a single
557 | combined work, and to convey the resulting work.  The terms of this
558 | License will continue to apply to the part which is the covered work,
559 | but the special requirements of the GNU Affero General Public License,
560 | section 13, concerning interaction through a network will apply to the
561 | combination as such.
562 | 
563 |   14. Revised Versions of this License.
564 | 
565 |   The Free Software Foundation may publish revised and/or new versions of
566 | the GNU General Public License from time to time.  Such new versions will
567 | be similar in spirit to the present version, but may differ in detail to
568 | address new problems or concerns.
569 | 
570 |   Each version is given a distinguishing version number.  If the
571 | Program specifies that a certain numbered version of the GNU General
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573 | option of following the terms and conditions either of that numbered
574 | version or of any later version published by the Free Software
575 | Foundation.  If the Program does not specify a version number of the
576 | GNU General Public License, you may choose any version ever published
577 | by the Free Software Foundation.
578 | 
579 |   If the Program specifies that a proxy can decide which future
580 | versions of the GNU General Public License can be used, that proxy's
581 | public statement of acceptance of a version permanently authorizes you
582 | to choose that version for the Program.
583 | 
584 |   Later license versions may give you additional or different
585 | permissions.  However, no additional obligations are imposed on any
586 | author or copyright holder as a result of your choosing to follow a
587 | later version.
588 | 
589 |   15. Disclaimer of Warranty.
590 | 
591 |   THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
592 | APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
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597 | IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
599 | 
600 |   16. Limitation of Liability.
601 | 
602 |   IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
610 | SUCH DAMAGES.
611 | 
612 |   17. Interpretation of Sections 15 and 16.
613 | 
614 |   If the disclaimer of warranty and limitation of liability provided
615 | above cannot be given local legal effect according to their terms,
616 | reviewing courts shall apply local law that most closely approximates
617 | an absolute waiver of all civil liability in connection with the
618 | Program, unless a warranty or assumption of liability accompanies a
619 | copy of the Program in return for a fee.
620 | 
621 |                      END OF TERMS AND CONDITIONS
622 | 
623 |             How to Apply These Terms to Your New Programs
624 | 
625 |   If you develop a new program, and you want it to be of the greatest
626 | possible use to the public, the best way to achieve this is to make it
627 | free software which everyone can redistribute and change under these terms.
628 | 
629 |   To do so, attach the following notices to the program.  It is safest
630 | to attach them to the start of each source file to most effectively
631 | state the exclusion of warranty; and each file should have at least
632 | the "copyright" line and a pointer to where the full notice is found.
633 | 
634 |     <one line to give the program's name and a brief idea of what it does.>
635 |     Copyright (C) <year>  <name of author>
636 | 
637 |     This program is free software: you can redistribute it and/or modify
638 |     it under the terms of the GNU General Public License as published by
639 |     the Free Software Foundation, either version 3 of the License, or
640 |     (at your option) any later version.
641 | 
642 |     This program is distributed in the hope that it will be useful,
643 |     but WITHOUT ANY WARRANTY; without even the implied warranty of
644 |     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
645 |     GNU General Public License for more details.
646 | 
647 |     You should have received a copy of the GNU General Public License
648 |     along with this program.  If not, see <https://www.gnu.org/licenses/>.
649 | 
650 | Also add information on how to contact you by electronic and paper mail.
651 | 
652 |   If the program does terminal interaction, make it output a short
653 | notice like this when it starts in an interactive mode:
654 | 
655 |     <program>  Copyright (C) <year>  <name of author>
656 |     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
657 |     This is free software, and you are welcome to redistribute it
658 |     under certain conditions; type `show c' for details.
659 | 
660 | The hypothetical commands `show w' and `show c' should show the appropriate
661 | parts of the General Public License.  Of course, your program's commands
662 | might be different; for a GUI interface, you would use an "about box".
663 | 
664 |   You should also get your employer (if you work as a programmer) or school,
665 | if any, to sign a "copyright disclaimer" for the program, if necessary.
666 | For more information on this, and how to apply and follow the GNU GPL, see
667 | <https://www.gnu.org/licenses/>.
668 | 
669 |   The GNU General Public License does not permit incorporating your program
670 | into proprietary programs.  If your program is a subroutine library, you
671 | may consider it more useful to permit linking proprietary applications with
672 | the library.  If this is what you want to do, use the GNU Lesser General
673 | Public License instead of this License.  But first, please read
674 | <https://www.gnu.org/licenses/why-not-lgpl.html>.
675 | 


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