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# gpl: author Nobuyuki Hirakata
import bpy
import bmesh
from random import (
gauss,
seed,
)
from math import radians, pi
from mathutils import Euler
# Join fractures into an object
def make_join(cells):
# Execute join
bpy.context.view_layer.objects.active = cells[0]
cells[0].select_set(state=True)
bpy.ops.object.join()
bpy.ops.object.origin_set(type='GEOMETRY_ORIGIN')
joined = bpy.context.active_object
suffix_index = joined.name.rfind("_cell")
if suffix_index != -1:
joined.name = joined.name[:suffix_index] + "_crack"
return bpy.context.active_object
# Add modifier and setting
def add_modifiers(decimate_val=0.4, smooth_val=0.5):
bpy.ops.object.modifier_add(type='DECIMATE')
decimate = bpy.context.object.modifiers[-1]
decimate.name = 'DECIMATE_crackit'
decimate.ratio = decimate_val
bpy.ops.object.modifier_add(type='SUBSURF')
subsurf = bpy.context.object.modifiers[-1]
subsurf.name = 'SUBSURF_crackit'
bpy.ops.object.modifier_add(type='SMOOTH')
smooth = bpy.context.object.modifiers[-1]
smooth.name = 'SMOOTH_crackit'
smooth.factor = smooth_val
# -------------- multi extrude --------------------
# var1=random offset, var2=random rotation, var3=random scale
def multiExtrude(off=0.1, rotx=0, roty=0, rotz=0, sca=0.0,
var1=0.01, var2=0.01, var3=0.01, num=1, ran=0):
obj = bpy.context.object
bpy.context.tool_settings.mesh_select_mode = [False, False, True]
# bmesh operations
bpy.ops.object.mode_set()
bm = bmesh.new()
bm.from_mesh(obj.data)
sel = [f for f in bm.faces if f.select]
# faces loop
for i, of in enumerate(sel):
rot = _vrot(r=i, ran=ran, rotx=rotx, var2=var2, roty=roty, rotz=rotz)
off = _vloc(r=i, ran=ran, off=off, var1=var1)
of.normal_update()
# extrusion loop
for r in range(num):
nf = of.copy()
nf.normal_update()
no = nf.normal.copy()
ce = nf.calc_center_bounds()
s = _vsca(r=i + r, ran=ran, var3=var3, sca=sca)
for v in nf.verts:
v.co -= ce
v.co.rotate(rot)
v.co += ce + no * off
v.co = v.co.lerp(ce, 1 - s)
# extrude code from TrumanBlending
for a, b in zip(of.loops, nf.loops):
sf = bm.faces.new((a.vert, a.link_loop_next.vert,
b.link_loop_next.vert, b.vert))
sf.normal_update()
bm.faces.remove(of)
of = nf
for v in bm.verts:
v.select = False
for e in bm.edges:
e.select = False
bm.to_mesh(obj.data)
obj.data.update()
def _vloc(r, ran, off, var1):
seed(ran + r)
return off * (1 + gauss(0, var1 / 3))
def _vrot(r, ran, rotx, var2, roty, rotz):
seed(ran + r)
return Euler((radians(rotx) + gauss(0, var2 / 3),
radians(roty) + gauss(0, var2 / 3),
radians(rotz) + gauss(0, var2 / 3)), 'XYZ')
def _vsca(r, ran, sca, var3):
seed(ran + r)
return sca * (1 + gauss(0, var3 / 3))
# Centroid of a selection of vertices
'''
def _centro(ver):
vvv = [v for v in ver if v.select]
if not vvv or len(vvv) == len(ver):
return ('error')
x = sum([round(v.co[0], 4) for v in vvv]) / len(vvv)
y = sum([round(v.co[1], 4) for v in vvv]) / len(vvv)
z = sum([round(v.co[2], 4) for v in vvv]) / len(vvv)
return (x, y, z)
'''
# Retrieve the original state of the object
'''
def _volver(obj, copia, om, msm, msv):
for i in copia:
obj.data.vertices[i].select = True
bpy.context.tool_settings.mesh_select_mode = msm
for i in range(len(msv)):
obj.modifiers[i].show_viewport = msv[i]
'''
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