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# ##### 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>
# Script copyright (C) Blender Foundation 2012
def points_as_bmesh_cells(verts, points):
import mathutils
from mathutils import Vector
cells = []
sortedVoronoiPoints = [p for p in points]
# there are many ways we could get planes - convex hull for eg
# but it ends up fastest if we just use bounding box
if 1:
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xa = [v[0] for v in verts]
ya = [v[1] for v in verts]
za = [v[2] for v in verts]
xmin, xmax = min(xa), max(xa)
ymin, ymax = min(ya), max(ya)
zmin, zmax = min(za), max(za)
convexPlanes = [
Vector((+1.0, 0.0, 0.0, -abs(xmax))),
Vector((-1.0, 0.0, 0.0, -abs(xmin))),
Vector((0.0, +1.0, 0.0, -abs(ymax))),
Vector((0.0, -1.0, 0.0, -abs(ymin))),
Vector((0.0, 0.0, +1.0, -abs(zmax))),
Vector((0.0, 0.0, -1.0, -abs(zmin))),
]
for i, curVoronoiPoint in enumerate(points):
planes = [None] * len(convexPlanes)
for j in range(len(convexPlanes)):
planes[j] = convexPlanes[j].copy()
planes[j][3] += planes[j].xyz.dot(curVoronoiPoint)
maxDistance = 10000000000.0 # a big value!
sortedVoronoiPoints.sort(key=lambda p: (p - curVoronoiPoint).length_squared)
for j in range(1, len(points)):
normal = sortedVoronoiPoints[j] - curVoronoiPoint
nlength = normal.length
if nlength > maxDistance:
break
plane = normal.normalized()
plane.resize_4d()
plane[3] = -nlength / 2.0
planes.append(plane)
vertices[:], plane_indices[:] = mathutils.geometry.points_in_planes(planes)
if len(vertices) == 0:
break
if len(plane_indices) != len(planes):
planes[:] = [planes[k] for k in plane_indices]
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maxDistance = vertices[0].length
for k in range(1, len(vertices)):
distance = vertices[k].length
if maxDistance < distance:
maxDistance = distance
maxDistance *= 2.0
if len(vertices) == 0:
continue
cells.append((curVoronoiPoint, vertices[:]))
vertices[:] = []
return cells
# --- run ---
# b ~/phys.blend -b --python cell_test.py
def main():
import bpy
import sys
#points = [v.co.copy() for v in bpy.data.objects["points"].data.vertices]
sys.path.append("/media/data/blender-svn/blender-phymec/phymec_tools")
import phymec_tools as pt
pt.voro_add_points(100)
#pt.physics_voronoi_shatter(pt.voro_points(particles=True),True)
#return
points = []
points.extend([p.location for p in bpy.data.objects["verts"].particle_systems[0].particles])
verts = [v.co.copy() for v in bpy.data.objects["verts"].data.vertices]
cells = points_as_bmesh_cells(verts, points)
for cent, cell in cells:
me = bpy.data.meshes.new(name="Blah")
ob = bpy.data.objects.new(name="Blah", object_data=me)
bpy.context.scene.objects.link(ob)
bpy.context.scene.objects.active = ob
ob.location = cent
# create the convex hulls
import bmesh
bm = bmesh.new()
for i, v in enumerate(cell):
bm_vert = bm.verts.new(v)
bm_vert.tag = True
import mathutils
bm.transform(mathutils.Matrix.Translation((+100.0, +100.0, +100.0))) # BUG IN BLENDER
bmesh.ops.remove_doubles(bm, {'TAG'}, 0.0001)
bmesh.ops.convex_hull(bm, {'TAG'})
bm.transform(mathutils.Matrix.Translation((-100.0, -100.0, -100.0))) # BUG IN BLENDER
bm.to_mesh(me)
bm.free()
print(len(cells))
import time
t = time.time()
main()
print("%.5f sec" % (time.time() - t))