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Update to work with Blender 2.8 and set up packaging.
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‎README.md

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![Screenshot](documentation/wire_skin_demo1.png?raw=true "Screenshot")
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## Installation
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This software works with Blender 2.8 and earlier versions too.
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Check out the repository and look in the demo directory.
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This software may also be installed via pip:
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python3 -m pip install wire_skin
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or
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pip3 install wire_skin
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## Motivation
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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.
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‎wire_skin_demo.blend ‎demo/wire_skin_demo.blend

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‎demo/wire_skin_demo.py

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

‎setup.py

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

‎wire_skin/__init__.py

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from .wire_skin import WireSkin

‎wire_skin.py ‎wire_skin/wire_skin.py

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

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