# vim:ts=4:et
#
# Copyright (C) 2012 Bill Currie <bill@taniwha.org>
# Date: 2012/2/20
#
# ##### BEGIN GPL LICENSE BLOCK #####
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ##### END GPL LICENSE BLOCK #####
# <pep8 compliant>
bl_info = {
"name": "Strut Generator",
"author": "Bill Currie",
"blender": (2, 6, 2),
"api": 35622,
"location": "View3D > Add > Mesh > Struts",
"description": "Add struts meshes based on selected truss meshes",
"warning": "can get very high-poly",
"wiki_url": "",
"tracker_url": "",
"category": "Add Mesh"}
import bpy
from bpy.props import FloatProperty,IntProperty,BoolProperty
from mathutils import Vector,Matrix
from math import pi, cos, sin
cossin = []
def build_cossin(n):
global cossin
cossin = []
for i in range(n):
a = 2 * pi * i / n
cossin.append((cos(a), sin(a)))
def make_strut(v1, v2, id, od, n, solid, loops):
v1 = Vector(v1)
v2 = Vector(v2)
axis = v2 - v1
pos = [(0, od / 2)]
if loops:
pos += [((od - id) / 2, od / 2),
(axis.length - (od - id) / 2, od / 2)]
pos += [(axis.length, od / 2)]
if solid:
pos += [(axis.length, id / 2)]
if loops:
pos += [(axis.length - (od - id) / 2, id / 2),
((od - id) / 2, id / 2)]
pos += [(0, id / 2)]
vps = len(pos)
fps = vps
if not solid:
fps -= 1
fw = axis.copy()
fw.normalize()
if (abs(axis[0] / axis.length) < 1e-5
and abs(axis[1] / axis.length) < 1e-5):
up = Vector((-1, 0, 0))
else:
up = Vector((0, 0, 1))
lf = up.cross(fw)
lf.normalize()
up = fw.cross(lf)
mat = Matrix((fw, lf, up))
mat.transpose()
verts = [None] * n * vps
faces = [None] * n * fps
for i in range(n):
base = (i - 1) * vps
x = cossin[i][0]
y = cossin[i][1]
for j in range(vps):
p = Vector((pos[j][0], pos[j][1] * x, pos[j][1] * y))
p = mat * p
verts[i * vps + j] = p + v1
if i:
for j in range(fps):
f = (i - 1) * fps + j
faces[f] = [base + j, base + vps + j,
base + vps + (j + 1) % vps, base + (j + 1) % vps]
base = len(verts) - vps
i = n
for j in range(fps):
f = (i - 1) * fps + j
faces[f] = [base + j, j, (j + 1) % vps, base + (j + 1) % vps]
#print(verts,faces)
return verts, faces
def create_struts(self, context, id, od, segments, solid, loops):
build_cossin(segments)
vps = 2
if solid:
vps *= 2
if loops:
vps *= 2
fps = vps
if not solid:
fps -= 1
bpy.context.user_preferences.edit.use_global_undo = False
for truss_obj in bpy.context.scene.objects:
if not truss_obj.select:
continue
truss_obj.select = False
truss_mesh = truss_obj.to_mesh(context.scene, True, 'PREVIEW')
if not truss_mesh.edges:
continue
mesh = bpy.data.meshes.new("Struts")
verts = [None] * len(truss_mesh.edges) * segments * vps
faces = [None] * len(truss_mesh.edges) * segments * fps
vbase = 0
fbase = 0
for e in truss_mesh.edges:
v1 = truss_mesh.vertices[e.vertices[0]]
v2 = truss_mesh.vertices[e.vertices[1]]
v, f = make_strut(v1.co, v2.co, id, od, segments, solid, loops)
for fv in f:
for i in range(len(fv)):
fv[i] += vbase
for i in range(len(v)):
verts[vbase + i] = v[i]
for i in range(len(f)):
faces[fbase + i] = f[i]
#if not base % 12800:
# print (base * 100 / len(verts))
vbase += vps * segments
fbase += fps * segments
#print(verts,faces)
mesh.from_pydata(verts, [], faces)
obj = bpy.data.objects.new("Struts", mesh)
bpy.context.scene.objects.link(obj)
obj.select = True
obj.location = truss_obj.location
bpy.context.scene.objects.active = obj
mesh.update()
bpy.context.user_preferences.edit.use_global_undo = True
return {'FINISHED'}
class Struts(bpy.types.Operator):
"""Add one or more struts meshes based on selected truss meshes"""
bl_idname = "mesh.generate_struts"
bl_label = "Struts"
bl_description = """Add one or more struts meshes based on selected truss meshes"""
bl_options = {'REGISTER', 'UNDO'}
id = FloatProperty(name = "Inside Diameter",
description = "diameter of inner surface",
min = 0.0,
soft_min = 0.0,
max = 100,
soft_max = 100,
default = 0.04)
od = FloatProperty(name = "Outside Diameter",
description = "diameter of outer surface",
min = 0.01,
soft_min = 0.01,
max = 100,
soft_max = 100,
default = 0.05)
solid = BoolProperty(name="Solid",
description="Create inner surface.",
default=True)
loops = BoolProperty(name="Loops",
description="Create sub-surf friendly loops.",
default=False)
segments = IntProperty(name="Segments",
description="Number of segments around strut",
min=3, soft_min=3,
max=64, soft_max=64,
default=32)
def execute(self, context):
keywords = self.as_keywords ()
return create_struts(self, context, **keywords)
def menu_func(self, context):
self.layout.operator(Struts.bl_idname, text = "Struts", icon='PLUGIN')
def register():
bpy.utils.register_module(__name__)
bpy.types.INFO_MT_mesh_add.append(menu_func)
def unregister():
bpy.utils.unregister_module(__name__)
if __name__ == "__main__":
register()