Update to work with Blender 2.8 and set up packaging.

README.md

@@ -14,6 +14,20 @@ Non-ASCII version:
 
 ![Screenshot](documentation/wire_skin_demo1.png?raw=true "Screenshot")
 
+## Installation
+
+This software works with Blender 2.8 and earlier versions too.
+
+Check out the repository and look in the demo directory.
+
+This software may also be installed via pip:
+
+python3 -m pip install wire_skin
+
+or
+
+pip3 install wire_skin
+
 ## Motivation
 Blender has a skin modifier that does great things for a lot of meshes. It doesn't seem to do the right thing for some of the sorts of meshes I want 3D printed (usually the caps where the vertices are have an asymmetry that is displeasing to me). The meshes I am trying to create are typically geometric cages for presenting other 3D objects.
 

demo/wire_skin_demo.py

@@ -0,0 +1,182 @@
+# Don't run me directly!
+# Take a look at wire_skin_demo.blend
+
+import bpy
+import sys
+from importlib import reload
+
+# Get wire_skin from current directory
+sys.path.append(bpy.path.abspath("//"))
+
+import wire_skin
+reload(wire_skin)
+
+from wire_skin import WireSkin
+
+def main():
+  # A bunch of layers have demos
+
+  # Generic mesh
+  layer1()
+
+  # Creased mesh
+  layer2()
+
+  # Spiky mesh
+  layer3()
+
+  # Generating multiple from same wire
+  layer4()
+
+  # Displace with booleans
+  layer5()
+
+  # Torus made of hexagons
+  layer6()
+
+  # Torus made of hexagons, proportial scale
+  layer7()
+
+  # 'Edges without poles' option
+  layer8()
+
+def wire_to_skin(in_name, out_name, **kwargs):
+  input_object = bpy.data.objects[in_name]
+  output_object = bpy.data.objects[out_name]
+  output_materials = output_object.data.materials
+
+  wire_skin = \
+    WireSkin(input_object.data, **kwargs)
+
+  me = wire_skin.create_mesh()
+  for material in output_materials:
+    me.materials.append(material)
+  output_object.data = me
+
+def layer1():
+  options = {
+    'width': 0.15,
+    'height': 0.1,
+    'inside_radius': 0.3,
+    'outside_radius': 0.8,
+    'dist': 0.4
+  }
+  wire_to_skin("Wire1", "WireSkin1", **options)
+
+def layer2():
+  options = {
+    'width': 0.1,
+    'height': 0.2,
+    'inside_radius': 0.1,
+    'outside_radius': 0.1,
+    'dist': 0.2,
+    'crease': 1.0
+  }
+  wire_to_skin("Wire2", "WireSkin2", **options)
+
+def layer3():
+  options = {
+    'width': 0.1,
+    'height': 0.2,
+    'inside_radius': 0.1,
+    'outside_radius': 0.8,
+    'dist': 0.2,
+  }
+  wire_to_skin("Wire3", "WireSkin3", **options)
+
+def layer4():
+  options = {
+    'width': 0.5,
+    'height': 0.2,
+    'inside_radius': 0.1,
+    'outside_radius': 0.1,
+    'dist': 0.8,
+  }
+  wire_to_skin("Wire4", "WireSkin4", **options)
+
+  options = {
+    'width': 0.3,
+    'height': 0.3,
+    'inside_radius': 0.1,
+    'outside_radius': 0.1,
+    'dist': 0.8,
+  }
+  wire_to_skin("Wire4", "WireSkin4a", **options)
+
+  options = {
+    'width': 0.1,
+    'height': 0.4,
+    'inside_radius': 0.1,
+    'outside_radius': 0.1,
+    'dist': 0.8,
+  }
+  wire_to_skin("Wire4", "WireSkin4b", **options)
+
+def layer5():
+  options = {
+    'width': 0.5,
+    'height': 0.3,
+    'inside_radius': 0.1,
+    'outside_radius': 0.1,
+    'dist': 1.0,
+    'crease': 1.0
+  }
+  wire_to_skin("Wire5", "WireSkin5", **options)
+
+  # This one is on layer 15
+  # It is subtracted from previous object
+  options = {
+    'width': 0.3,
+    'height': 0.3,
+    'inside_radius': 0.1,
+    'outside_radius': 0.1,
+    'dist': 0.8,
+    'crease': 1.0,
+    'displace': 0.15
+  }
+  wire_to_skin("Wire5", "WireSkin5a", **options)
+
+  options = {
+    'width': 0.05,
+    'height': 0.3,
+    'inside_radius': 0.1,
+    'outside_radius': 0.1,
+    'dist': 0.8,
+    'crease': 1.0,
+  }
+  wire_to_skin("Wire5", "WireSkin5b", **options)
+
+def layer6():
+  options = {
+    'width': 0.07,
+    'height': 0.05,
+    'inside_radius': 0.04,
+    'outside_radius': 0.02,
+    'dist': 0.025
+  }
+  wire_to_skin("Wire6", "WireSkin6", **options)
+
+def layer7():
+  options = {
+    'width': 0.3,
+    'height': 0.3,
+    'inside_radius': 0.2,
+    'outside_radius': 0.1,
+    'dist': 0.3,
+    'proportional_scale': True
+  }
+  wire_to_skin("Wire7", "WireSkin7", **options)
+
+def layer8():
+  options = {
+    'width': 0.15,
+    'height': 0.1,
+    'inside_radius': 0.3,
+    'outside_radius': 0.8,
+    'dist': 0.4
+  }
+  wire_to_skin("Wire8", "WireSkin8", **options)
+  options['edges_without_poles'] = True
+  wire_to_skin("Wire8", "WireSkin8a", **options)
+
+main()

setup.py

@@ -0,0 +1,43 @@
+from setuptools import setup, find_packages
+
+long_description = '''
+=======================================================================
+wire_skin: construct a simple skin around a wire frame mesh in Blender.
+=======================================================================
+
+Please visit the Github repository for documentation:
+
+`<https://github.com/cwant/wire_skin>`_
+
+Either checkout the code from the Github project, or install via pip::
+
+    python3 -m pip install wire_skin
+
+or::
+
+    pip3 install wire_skin
+
+'''[1:-1]
+
+setup(
+    name='wire_skin',
+    version='0.3',
+    description='Construct a simple skin around a wire frame mesh in Blender.',
+    long_description=long_description,
+    url='https://github.com/cwant/wire_skin',
+    author='Chris Want',
+    classifiers=['Development Status :: 3 - Alpha',
+                 'Intended Audience :: Developers',
+                 'Intended Audience :: Manufacturing',
+                 'Intended Audience :: Science/Research',
+                 'License :: OSI Approved :: Apache Software License',
+                 'Natural Language :: English',
+                 'Programming Language :: Python :: 3 :: Only',
+                 'Topic :: Artistic Software',
+                 'Topic :: Multimedia :: Graphics :: 3D Modeling',
+                 'Topic :: Scientific/Engineering :: Mathematics',
+                 'Topic :: Scientific/Engineering :: Visualization'],
+    keywords='skin wire frame modeling blender',
+    packages=find_packages(exclude=['tests', 'demo']),
+    python_requires='~=3.5'
+)

wire_skin/__init__.py

@@ -0,0 +1 @@
+from .wire_skin import WireSkin

wire_skin.py → wire_skin/wire_skin.py

@@ -60,6 +60,19 @@ def __init__(self, v, bm, **kwargs):
 
     self.creased_edges = []
 
+    # Gee whiz, I can't believe I have to do this ...
+    blender_version = float(bpy.app.version_string.split()[0])
+    if (blender_version < 2.8):
+      self.mult = self.mult_27
+    else:
+      self.mult = self.mult_28
+
+  def mult_27(self, x, y):
+    return x * y
+
+  def mult_28(self, x, y):
+    return x @ y
+
   def add_edge_vert(self, edge, v):
     vec = Vector(v.co)
     edge_vert = { 'v': vec,
@@ -115,7 +128,7 @@ def least_squares_normal(self, vave, diffs):
       a = (yz*xy - xz*yy) / det_z
       b = (xz*xy - yz*xx) / det_z
       normal = Vector((a, b, 1.0))
-    if vave * normal < 0.0:
+    if self.mult(vave, normal) < 0.0:
       return -normal
     return normal
 
@@ -207,7 +220,7 @@ def reorder_edge_verts(self):
     theta_edge_verts = {}
     for i in range(1, len(self.input_edge_verts)):
       edge_vert = self.input_edge_verts[i]['v']
-      v = mat * (edge_vert - self.input_vert)
+      v = self.mult(mat, edge_vert - self.input_vert)
       theta = atan2(v[1], v[0])
       if theta < 0.0:
         theta += 2 * pi