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colors_groups_exchanger.py
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colors_groups_exchanger.py
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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 #####
#-------------------------- COLORS / GROUPS EXCHANGER -------------------------#
# #
# Vertex Color to Vertex Group allow you to convert colors channles to weight #
# maps. #
# The main purpose is to use vertex colors to store information when importing #
# files from other softwares. The script works with the active vertex color #
# slot. #
# For use the command "Vertex Clors to Vertex Groups" use the search bar #
# (space bar). #
# #
# (c) Alessandro Zomparelli #
# (2017) #
# #
# http://www.co-de-it.com/ #
# #
################################################################################
import bpy, bmesh
import numpy as np
import math, timeit, time
from math import *#pi, sin
from statistics import mean, stdev
from mathutils import Vector
from numpy import *
try: from .numba_functions import numba_reaction_diffusion
except: pass
#from .numba_functions import numba_reaction_diffusion
try: import numexpr as ne
except: pass
from bpy.types import (
Operator,
Panel,
PropertyGroup,
)
from bpy.props import (
BoolProperty,
EnumProperty,
FloatProperty,
IntProperty,
StringProperty,
FloatVectorProperty,
IntVectorProperty
)
from .utils import *
def reaction_diffusion_add_handler(self, context):
# remove existing handlers
old_handlers = []
for h in bpy.app.handlers.frame_change_post:
if "reaction_diffusion" in str(h):
old_handlers.append(h)
for h in old_handlers: bpy.app.handlers.frame_change_post.remove(h)
# add new handler
bpy.app.handlers.frame_change_post.append(reaction_diffusion_def)
class formula_prop(PropertyGroup):
name : StringProperty()
formula : StringProperty()
float_var : FloatVectorProperty(name="", description="", default=(0, 0, 0, 0, 0), size=5)
int_var : IntVectorProperty(name="", description="", default=(0, 0, 0, 0, 0), size=5)
class reaction_diffusion_prop(PropertyGroup):
run : BoolProperty(default=False, update = reaction_diffusion_add_handler,
description='Compute a new iteration on frame changes. Currently is not working during Render Animation')
time_steps : bpy.props.IntProperty(
name="Steps", default=10, min=0, soft_max=50,
description="Number of Steps")
dt : bpy.props.FloatProperty(
name="dt", default=1, min=0, soft_max=0.2,
description="Time Step")
diff_a : bpy.props.FloatProperty(
name="Diff A", default=0.1, min=0, soft_max=2, precision=3,
description="Diffusion A")
diff_b : bpy.props.FloatProperty(
name="Diff B", default=0.05, min=0, soft_max=2, precision=3,
description="Diffusion B")
'''
f : bpy.props.FloatProperty(
name="f", default=0.055, min=0, soft_min=0.01, soft_max=0.06, max=0.1, precision=4, step=0.05,
description="Feed Rate")
k : bpy.props.FloatProperty(
name="k", default=0.062, min=0, soft_min=0.035, soft_max=0.065, max=0.1, precision=4, step=0.05,
description="Kill Rate")
'''
f : bpy.props.FloatProperty(
name="f", default=0.055, soft_min=0.01, soft_max=0.06, precision=4, step=0.05,
description="Feed Rate")
k : bpy.props.FloatProperty(
name="k", default=0.062, soft_min=0.035, soft_max=0.065, precision=4, step=0.05,
description="Kill Rate")
diff_mult : bpy.props.FloatProperty(
name="Scale", default=1, min=0, soft_max=1, max=10, precision=2,
description="Multiplier for the diffusion of both substances")
vertex_group_diff_a : bpy.props.StringProperty(
name="Diff A", default='',
description="Vertex Group used for A diffusion")
vertex_group_diff_b : bpy.props.StringProperty(
name="Diff B", default='',
description="Vertex Group used for B diffusion")
vertex_group_scale : bpy.props.StringProperty(
name="Scale", default='',
description="Vertex Group used for Scale value")
vertex_group_f : bpy.props.StringProperty(
name="f", default='',
description="Vertex Group used for Feed value (f)")
vertex_group_k : bpy.props.StringProperty(
name="k", default='',
description="Vertex Group used for Kill value (k)")
vertex_group_brush : bpy.props.StringProperty(
name="Brush", default='',
description="Vertex Group used for adding/removing B")
invert_vertex_group_diff_a : BoolProperty(default=False,
description='Inverte the value of the Vertex Group Diff A')
invert_vertex_group_diff_b : BoolProperty(default=False,
description='Inverte the value of the Vertex Group Diff B')
invert_vertex_group_scale : BoolProperty(default=False,
description='Inverte the value of the Vertex Group Scale')
invert_vertex_group_f : BoolProperty(default=False,
description='Inverte the value of the Vertex Group f')
invert_vertex_group_k : BoolProperty(default=False,
description='Inverte the value of the Vertex Group k')
min_diff_a : bpy.props.FloatProperty(
name="Min Diff A", default=0.1, min=0, soft_max=2, precision=3,
description="Min Diff A")
max_diff_a : bpy.props.FloatProperty(
name="Max Diff A", default=0.1, min=0, soft_max=2, precision=3,
description="Max Diff A")
min_diff_b : bpy.props.FloatProperty(
name="Min Diff B", default=0.1, min=0, soft_max=2, precision=3,
description="Min Diff B")
max_diff_b : bpy.props.FloatProperty(
name="Max Diff B", default=0.1, min=0, soft_max=2, precision=3,
description="Max Diff B")
min_scale : bpy.props.FloatProperty(
name="Scale", default=0.35, min=0, soft_max=1, max=10, precision=2,
description="Min Scale Value")
max_scale : bpy.props.FloatProperty(
name="Scale", default=1, min=0, soft_max=1, max=10, precision=2,
description="Max Scale value")
min_f : bpy.props.FloatProperty(
name="Min f", default=0.02, min=0, soft_min=0.01, soft_max=0.06, max=0.1, precision=4, step=0.05,
description="Min Feed Rate")
max_f : bpy.props.FloatProperty(
name="Max f", default=0.055, min=0, soft_min=0.01, soft_max=0.06, max=0.1, precision=4, step=0.05,
description="Max Feed Rate")
min_k : bpy.props.FloatProperty(
name="Min k", default=0.035, min=0, soft_min=0.035, soft_max=0.065, max=0.1, precision=4, step=0.05,
description="Min Kill Rate")
max_k : bpy.props.FloatProperty(
name="Max k", default=0.062, min=0, soft_min=0.035, soft_max=0.065, max=0.1, precision=4, step=0.05,
description="Max Kill Rate")
brush_mult : bpy.props.FloatProperty(
name="Mult", default=0.5, min=-1, max=1, precision=3, step=0.05,
description="Multiplier for brush value")
bool_mod : bpy.props.BoolProperty(
name="Use Modifiers", default=False,
description="Read modifiers affect the vertex groups")
def compute_formula(ob=None, formula="rx", float_var=(0,0,0,0,0), int_var=(0,0,0,0,0)):
verts = ob.data.vertices
n_verts = len(verts)
f1,f2,f3,f4,f5 = float_var
i1,i2,i3,i4,i5 = int_var
do_groups = "w[" in formula
do_local = "lx" in formula or "ly" in formula or "lz" in formula
do_global = "gx" in formula or "gy" in formula or "gz" in formula
do_relative = "rx" in formula or "ry" in formula or "rz" in formula
do_normal = "nx" in formula or "ny" in formula or "nz" in formula
mat = ob.matrix_world
for i in range(1000):
if "w["+str(i)+"]" in formula and i > len(ob.vertex_groups)-1:
return "w["+str(i)+"] not found"
w = []
for i in range(len(ob.vertex_groups)):
w.append([])
if "w["+str(i)+"]" in formula:
vg = ob.vertex_groups[i]
for v in verts:
try:
w[i].append(vg.weight(v.index))
except:
w[i].append(0)
w[i] = array(w[i])
start_time = timeit.default_timer()
# compute vertex coordinates
if do_local or do_relative or do_global:
co = [0]*n_verts*3
verts.foreach_get('co', co)
np_co = array(co).reshape((n_verts, 3))
lx, ly, lz = array(np_co).transpose()
if do_relative:
rx = np.interp(lx, (lx.min(), lx.max()), (0, +1))
ry = np.interp(ly, (ly.min(), ly.max()), (0, +1))
rz = np.interp(lz, (lz.min(), lz.max()), (0, +1))
if do_global:
co = [v.co for v in verts]
global_co = []
for v in co:
global_co.append(mat @ v)
global_co = array(global_co).reshape((n_verts, 3))
gx, gy, gz = array(global_co).transpose()
# compute vertex normals
if do_normal:
normal = [0]*n_verts*3
verts.foreach_get('normal', normal)
normal = array(normal).reshape((n_verts, 3))
nx, ny, nz = array(normal).transpose()
try:
weight = eval(formula)
return weight
except:
return "There is something wrong"
print("Weight Formula: " + str(timeit.default_timer() - start_time))
class weight_formula_wiki(bpy.types.Operator):
bl_idname = "scene.weight_formula_wiki"
bl_label = "Online Documentation"
bl_options = {'REGISTER', 'UNDO'}
def execute(self, context):
bpy.ops.wm.url_open(url="https://github.com/alessandro-zomparelli/tissue/wiki/Weight-Tools#weight-formula")
return {'FINISHED'}
class weight_formula(bpy.types.Operator):
bl_idname = "object.weight_formula"
bl_label = "Weight Formula"
bl_options = {'REGISTER', 'UNDO'}
ex = [
#'cos(arctan(nx/ny)*6 + sin(rz*30)*0.5)/2 + cos(arctan(nx/ny)*6 - sin(rz*30)*0.5 + pi/2)/2 + 0.5',
'cos(arctan(nx/ny)*i1*2 + sin(rz*i3))/i2 + cos(arctan(nx/ny)*i1*2 - sin(rz*i3))/i2 + 0.5',
'cos(arctan(nx/ny)*i1*2 + sin(rz*i2))/2 + cos(arctan(nx/ny)*i1*2 - sin(rz*i2))/2',
'(sin(arctan(nx/ny)*i1)*sin(nz*i1)+1)/2',
'cos(arctan(nx/ny)*f1)',
'cos(arctan(lx/ly)*f1 + sin(rz*f2)*f3)',
'sin(nx*15)<sin(ny*15)',
'cos(ny*rz**2*i1)',
'sin(rx*30) > 0',
'sin(nz*i1)',
'w[0]**2',
'sqrt((rx-0.5)**2 + (ry-0.5)**2)*2',
'abs(0.5-rz)*2',
'rx'
]
ex_items = list((s,s,"") for s in ex)
ex_items.append(('CUSTOM', "User Formula", ""))
examples : bpy.props.EnumProperty(
items = ex_items, default='CUSTOM', name="Examples")
old_ex = ""
formula : bpy.props.StringProperty(
name="Formula", default="", description="Formula to Evaluate")
bl_description = ("Generate a Vertex Group based on the given formula")
slider_f01 : bpy.props.FloatProperty(
name="f1", default=1, description="Slider")
bl_description = ("Slider Float 1")
slider_f02 : bpy.props.FloatProperty(
name="f2", default=1, description="Slider")
bl_description = ("Slider Float 2")
slider_f03 : bpy.props.FloatProperty(
name="f3", default=1, description="Slider")
bl_description = ("Slider Float 3")
slider_f04 : bpy.props.FloatProperty(
name="f4", default=1, description="Slider")
bl_description = ("Slider Float 4")
slider_f05 : bpy.props.FloatProperty(
name="f5", default=1, description="Slider")
bl_description = ("Slider Float 5")
slider_i01 : bpy.props.IntProperty(
name="i1", default=1, description="Slider")
bl_description = ("Slider Integer 1")
slider_i02 : bpy.props.IntProperty(
name="i2", default=1, description="Slider")
bl_description = ("Slider Integer 2")
slider_i03 : bpy.props.IntProperty(
name="i3", default=1, description="Slider")
bl_description = ("Slider Integer 3")
slider_i04 : bpy.props.IntProperty(
name="i4", default=1, description="Slider")
bl_description = ("Slider Integer 4")
slider_i05 : bpy.props.IntProperty(
name="i5", default=1, description="Slider")
bl_description = ("Slider Integer 5")
def invoke(self, context, event):
return context.window_manager.invoke_props_dialog(self, width=350)
def draw(self, context):
layout = self.layout
#layout.label(text="Examples")
layout.prop(self, "examples", text="Examples")
#if self.examples == 'CUSTOM':
layout.label(text="Formula")
layout.prop(self, "formula", text="")
#try: self.examples = self.formula
#except: pass
if self.examples != self.old_ex and self.examples != 'CUSTOM':
self.formula = self.examples
self.old_ex = self.examples
elif self.formula != self.examples:
self.examples = 'CUSTOM'
formula = self.formula
layout.separator()
if "f1" in formula: layout.prop(self, "slider_f01")
if "f2" in formula: layout.prop(self, "slider_f02")
if "f3" in formula: layout.prop(self, "slider_f03")
if "f4" in formula: layout.prop(self, "slider_f04")
if "f5" in formula: layout.prop(self, "slider_f05")
if "i1" in formula: layout.prop(self, "slider_i01")
if "i2" in formula: layout.prop(self, "slider_i02")
if "i3" in formula: layout.prop(self, "slider_i03")
if "i4" in formula: layout.prop(self, "slider_i04")
if "i5" in formula: layout.prop(self, "slider_i05")
layout.label(text="Variables (for each vertex):")
layout.label(text="lx, ly, lz: Local Coordinates", icon='ORIENTATION_LOCAL')
layout.label(text="gx, gy, gz: Global Coordinates", icon='WORLD')
layout.label(text="rx, ry, rz: Local Coordinates (0 to 1)", icon='NORMALIZE_FCURVES')
layout.label(text="nx, ny, nz: Normal Coordinates", icon='SNAP_NORMAL')
layout.label(text="w[0], w[1], w[2], ... : Vertex Groups", icon="GROUP_VERTEX")
layout.separator()
layout.label(text="f1, f2, f3, f4, f5: Float Sliders", icon='MOD_HUE_SATURATION')#PROPERTIES
layout.label(text="i1, i2, i3, i4, i5: Integer Sliders", icon='MOD_HUE_SATURATION')
layout.separator()
#layout.label(text="All mathematical functions are based on Numpy", icon='INFO')
#layout.label(text="https://docs.scipy.org/doc/numpy-1.13.0/reference/routines.math.html", icon='INFO')
layout.operator("scene.weight_formula_wiki", icon="HELP")
#layout.label(text="(where 'i' is the index of the Vertex Group)")
def execute(self, context):
ob = bpy.context.active_object
n_verts = len(ob.data.vertices)
#if self.examples == 'CUSTOM':
# formula = self.formula
#else:
#self.formula = self.examples
# formula = self.examples
#f1, f2, f3, f4, f5 = self.slider_f01, self.slider_f02, self.slider_f03, self.slider_f04, self.slider_f05
#i1, i2, i3, i4, i5 = self.slider_i01, self.slider_i02, self.slider_i03, self.slider_i04, self.slider_i05
f_sliders = self.slider_f01, self.slider_f02, self.slider_f03, self.slider_f04, self.slider_f05
i_sliders = self.slider_i01, self.slider_i02, self.slider_i03, self.slider_i04, self.slider_i05
if self.examples != self.old_ex and self.examples != 'CUSTOM':
self.formula = self.examples
self.old_ex = self.examples
elif self.formula != self.examples:
self.examples = 'CUSTOM'
formula = self.formula
if formula == "": return {'FINISHED'}
vertex_group_name = "Formula " + formula
ob.vertex_groups.new(name=vertex_group_name)
weight = compute_formula(ob, formula=formula, float_var=f_sliders, int_var=i_sliders)
if type(weight) == str:
self.report({'ERROR'}, weight)
return {'CANCELLED'}
#start_time = timeit.default_timer()
weight = nan_to_num(weight)
if type(weight) == int or type(weight) == float:
for i in range(n_verts):
ob.vertex_groups[-1].add([i], weight, 'REPLACE')
elif type(weight) == ndarray:
for i in range(n_verts):
ob.vertex_groups[-1].add([i], weight[i], 'REPLACE')
ob.data.update()
bpy.ops.object.mode_set(mode='WEIGHT_PAINT')
# Store formula settings
new_formula = ob.formula_settings.add()
new_formula.name = ob.vertex_groups[-1].name
new_formula.formula = formula
new_formula.int_var = i_sliders
new_formula.float_var = f_sliders
#for f in ob.formula_settings:
# print(f.name, f.formula, f.int_var, f.float_var)
return {'FINISHED'}
class _weight_laplacian(bpy.types.Operator):
bl_idname = "object._weight_laplacian"
bl_label = "Weight Laplacian"
bl_description = ("Compute the Vertex Group Laplacian")
bl_options = {'REGISTER', 'UNDO'}
bounds : bpy.props.EnumProperty(
items=(('MANUAL', "Manual Bounds", ""),
('POSITIVE', "Positive Only", ""),
('NEGATIVE', "Negative Only", ""),
('AUTOMATIC', "Automatic Bounds", "")),
default='AUTOMATIC', name="Bounds")
mode : bpy.props.EnumProperty(
items=(('LENGTH', "Length Weight", ""),
('SIMPLE', "Simple", "")),
default='SIMPLE', name="Evaluation Mode")
min_def : bpy.props.FloatProperty(
name="Min", default=0, soft_min=-1, soft_max=0,
description="Laplacian value with 0 weight")
max_def : bpy.props.FloatProperty(
name="Max", default=0.5, soft_min=0, soft_max=5,
description="Laplacian value with 1 weight")
bounds_string = ""
frame = None
@classmethod
def poll(cls, context):
return len(context.object.vertex_groups) > 0
def draw(self, context):
layout = self.layout
col = layout.column(align=True)
col.label(text="Evaluation Mode")
col.prop(self, "mode", text="")
col.label(text="Bounds")
col.prop(self, "bounds", text="")
if self.bounds == 'MANUAL':
col.label(text="Strain Rate \u03B5:")
col.prop(self, "min_def")
col.prop(self, "max_def")
col.label(text="\u03B5" + ": from " + self.bounds_string)
def execute(self, context):
try: ob = context.object
except:
self.report({'ERROR'}, "Please select an Object")
return {'CANCELLED'}
group_id = ob.vertex_groups.active_index
input_group = ob.vertex_groups[group_id].name
group_name = "Laplacian"
ob.vertex_groups.new(name=group_name)
me = ob.data
bm = bmesh.new()
bm.from_mesh(me)
bm.edges.ensure_lookup_table()
# store weight values
weight = []
for v in me.vertices:
try:
weight.append(ob.vertex_groups[input_group].weight(v.index))
except:
weight.append(0)
n_verts = len(bm.verts)
lap = [0]*n_verts
for e in bm.edges:
if self.mode == 'LENGTH':
length = e.calc_length()
if length == 0: continue
id0 = e.verts[0].index
id1 = e.verts[1].index
lap[id0] += weight[id1]/length - weight[id0]/length
lap[id1] += weight[id0]/length - weight[id1]/length
else:
id0 = e.verts[0].index
id1 = e.verts[1].index
lap[id0] += weight[id1] - weight[id0]
lap[id1] += weight[id0] - weight[id1]
mean_lap = mean(lap)
stdev_lap = stdev(lap)
filter_lap = [i for i in lap if mean_lap-2*stdev_lap < i < mean_lap+2*stdev_lap]
if self.bounds == 'MANUAL':
min_def = self.min_def
max_def = self.max_def
elif self.bounds == 'AUTOMATIC':
min_def = min(filter_lap)
max_def = max(filter_lap)
self.min_def = min_def
self.max_def = max_def
elif self.bounds == 'NEGATIVE':
min_def = 0
max_def = min(filter_lap)
self.min_def = min_def
self.max_def = max_def
elif self.bounds == 'POSITIVE':
min_def = 0
max_def = max(filter_lap)
self.min_def = min_def
self.max_def = max_def
delta_def = max_def - min_def
# check undeformed errors
if delta_def == 0: delta_def = 0.0001
for i in range(len(lap)):
val = (lap[i]-min_def)/delta_def
if val > 0.7: print(str(val) + " " + str(lap[i]))
#val = weight[i] + 0.2*lap[i]
ob.vertex_groups[-1].add([i], val, 'REPLACE')
self.bounds_string = str(round(min_def,2)) + " to " + str(round(max_def,2))
ob.vertex_groups[-1].name = group_name + " " + self.bounds_string
ob.vertex_groups.update()
ob.data.update()
bpy.ops.object.mode_set(mode='WEIGHT_PAINT')
return {'FINISHED'}
class weight_laplacian(bpy.types.Operator):
bl_idname = "object.weight_laplacian"
bl_label = "Weight Laplacian"
bl_description = ("Compute the Vertex Group Laplacian")
bl_options = {'REGISTER', 'UNDO'}
steps : bpy.props.IntProperty(
name="Steps", default=10, min=0, soft_max=50,
description="Number of Steps")
dt : bpy.props.FloatProperty(
name="dt", default=0.2, min=0, soft_max=0.2,
description="Time Step")
diff_a : bpy.props.FloatProperty(
name="Diff A", default=1, min=0, soft_max=2,
description="Diffusion A")
diff_b : bpy.props.FloatProperty(
name="Diff B", default=0.5, min=0, soft_max=2,
description="Diffusion B")
f : bpy.props.FloatProperty(
name="f", default=0.055, min=0, soft_min=0.01, soft_max=0.06, max=0.1, precision=4,
description="Feed Rate")
k : bpy.props.FloatProperty(
name="k", default=0.062, min=0, soft_min=0.035, soft_max=0.065, max=0.1, precision=4,
description="Kill Rate")
diff_mult : bpy.props.FloatProperty(
name="Scale", default=1, min=0, soft_max=1, max=2, precision=2,
description="Multiplier for the diffusion of both substances")
bounds_string = ""
frame = None
@classmethod
def poll(cls, context):
return len(context.object.vertex_groups) > 0
def execute(self, context):
try: ob = context.object
except:
self.report({'ERROR'}, "Please select an Object")
return {'CANCELLED'}
me = ob.data
bm = bmesh.new()
bm.from_mesh(me)
bm.edges.ensure_lookup_table()
# store weight values
a = []
b = []
for v in me.vertices:
try:
a.append(ob.vertex_groups["A"].weight(v.index))
except:
a.append(0)
try:
b.append(ob.vertex_groups["B"].weight(v.index))
except:
b.append(0)
a = array(a)
b = array(b)
f = self.f
k = self.k
diff_a = self.diff_a * self.diff_mult
diff_b = self.diff_b * self.diff_mult
dt = self.dt
# initialize
n_verts = len(bm.verts)
# find max number of edges for vertex
max_edges = 0
n_neighbors = []
id_neighbors = []
for v in bm.verts:
n_edges = len(v.link_edges)
max_edges = max(max_edges, n_edges)
n_neighbors.append(n_edges)
neighbors = []
for e in link_edges:
for v1 in e.verts:
if v != v1: neighbors.append(v1.index)
id_neighbors.append(neighbors)
n_neighbors = array(n_neighbors)
a = [[] for i in range(n_verts)]
lap_map = []
for e in bm.edges:
id0 = e.verts[0].index
id1 = e.verts[1].index
lap_map[id0].append(id1)
lap_map[id1].append(id0)
e1 = array(e1)
e2 = array(e2)
lap_a = a[e1]
for i in range(self.steps):
lap_a = zeros((n_verts))#[0]*n_verts
lap_b = zeros((n_verts))#[0]*n_verts
for e in bm.edges:
id0 = e.verts[0].index
id1 = e.verts[1].index
lap_a[id0] += a[id1] - a[id0]
lap_a[id1] += a[id0] - a[id1]
lap_b[id0] += b[id1] - b[id0]
lap_b[id1] += b[id0] - b[id1]
ab2 = a*b**2
a += (diff_a*lap_a - ab2 + f*(1-a))*dt
b += (diff_b*lap_b + ab2 - (k+f)*b)*dt
for i in range(n_verts):
ob.vertex_groups['A'].add([i], a[i], 'REPLACE')
ob.vertex_groups['B'].add([i], b[i], 'REPLACE')
ob.vertex_groups.update()
ob.data.update()
bpy.ops.object.mode_set(mode='WEIGHT_PAINT')
return {'FINISHED'}
class reaction_diffusion(bpy.types.Operator):
bl_idname = "object.reaction_diffusion"
bl_label = "Reaction Diffusion"
bl_description = ("Run a Reaction-Diffusion based on existing Vertex Groups: A and B")
bl_options = {'REGISTER', 'UNDO'}
steps : bpy.props.IntProperty(
name="Steps", default=10, min=0, soft_max=50,
description="Number of Steps")
dt : bpy.props.FloatProperty(
name="dt", default=0.2, min=0, soft_max=0.2,
description="Time Step")
diff_a : bpy.props.FloatProperty(
name="Diff A", default=1, min=0, soft_max=2,
description="Diffusion A")
diff_b : bpy.props.FloatProperty(
name="Diff B", default=0.5, min=0, soft_max=2,
description="Diffusion B")
f : bpy.props.FloatProperty(
name="f", default=0.055, min=0, soft_min=0.01, soft_max=0.06, max=0.1, precision=4,
description="Feed Rate")
k : bpy.props.FloatProperty(
name="k", default=0.062, min=0, soft_min=0.035, soft_max=0.065, max=0.1, precision=4,
description="Kill Rate")
bounds_string = ""
frame = None
@classmethod
def poll(cls, context):
return len(context.object.vertex_groups) > 0
def execute(self, context):
#bpy.app.handlers.frame_change_post.remove(reaction_diffusion_def)
reaction_diffusion_add_handler(self, context)
set_animatable_fix_handler(self, context)
try: ob = context.object
except:
self.report({'ERROR'}, "Please select an Object")
return {'CANCELLED'}
me = ob.data
bm = bmesh.new()
bm.from_mesh(me)
bm.edges.ensure_lookup_table()
# store weight values
a = []
b = []
for v in me.vertices:
try:
a.append(ob.vertex_groups["A"].weight(v.index))
except:
a.append(0)
try:
b.append(ob.vertex_groups["B"].weight(v.index))
except:
b.append(0)
a = array(a)
b = array(b)
f = self.f
k = self.k
diff_a = self.diff_a
diff_b = self.diff_b
dt = self.dt
n_verts = len(bm.verts)
for i in range(self.steps):
lap_a = zeros((n_verts))#[0]*n_verts
lap_b = zeros((n_verts))#[0]*n_verts
for e in bm.edges:
id0 = e.verts[0].index
id1 = e.verts[1].index
lap_a[id0] += a[id1] - a[id0]
lap_a[id1] += a[id0] - a[id1]
lap_b[id0] += b[id1] - b[id0]
lap_b[id1] += b[id0] - b[id1]
ab2 = a*b**2
a += (diff_a*lap_a - ab2 + f*(1-a))*dt
b += (diff_b*lap_b + ab2 - (k+f)*b)*dt
for i in range(n_verts):
ob.vertex_groups['A'].add([i], a[i], 'REPLACE')
ob.vertex_groups['B'].add([i], b[i], 'REPLACE')
ob.vertex_groups.update()
ob.data.update()
bpy.ops.wm.redraw_timer(type='DRAW_WIN_SWAP', iterations=1)
bpy.ops.object.mode_set(mode='WEIGHT_PAINT')
return {'FINISHED'}
class edges_deformation(bpy.types.Operator):
bl_idname = "object.edges_deformation"
bl_label = "Edges Deformation"
bl_description = ("Compute Weight based on the deformation of edges"+
"according to visible modifiers.")
bl_options = {'REGISTER', 'UNDO'}
bounds : bpy.props.EnumProperty(
items=(('MANUAL', "Manual Bounds", ""),
('COMPRESSION', "Compressed Only", ""),
('TENSION', "Extended Only", ""),
('AUTOMATIC', "Automatic Bounds", "")),
default='AUTOMATIC', name="Bounds")
mode : bpy.props.EnumProperty(
items=(('MAX', "Max Deformation", ""),
('MEAN', "Average Deformation", "")),
default='MEAN', name="Evaluation Mode")
min_def : bpy.props.FloatProperty(
name="Min", default=0, soft_min=-1, soft_max=0,
description="Deformations with 0 weight")
max_def : bpy.props.FloatProperty(
name="Max", default=0.5, soft_min=0, soft_max=5,
description="Deformations with 1 weight")
bounds_string = ""
frame = None
@classmethod
def poll(cls, context):
return len(context.object.modifiers) > 0
def draw(self, context):
layout = self.layout
col = layout.column(align=True)
col.label(text="Evaluation Mode")
col.prop(self, "mode", text="")
col.label(text="Bounds")
col.prop(self, "bounds", text="")
if self.bounds == 'MANUAL':
col.label(text="Strain Rate \u03B5:")
col.prop(self, "min_def")
col.prop(self, "max_def")
col.label(text="\u03B5" + ": from " + self.bounds_string)
def execute(self, context):
try: ob = context.object
except:
self.report({'ERROR'}, "Please select an Object")
return {'CANCELLED'}
# check if the object is Cloth or Softbody
physics = False
for m in ob.modifiers:
if m.type == 'CLOTH' or m.type == 'SOFT_BODY':
physics = True
if context.scene.frame_current == 1 and self.frame != None:
context.scene.frame_current = self.frame
break
if not physics: self.frame = None
if self.mode == 'MEAN': group_name = "Average Deformation"
elif self.mode == 'MAX': group_name = "Max Deformation"
ob.vertex_groups.new(name=group_name)
me0 = ob.data
me = simple_to_mesh(ob) #ob.to_mesh(preserve_all_data_layers=True, depsgraph=bpy.context.evaluated_depsgraph_get()).copy()
if len(me.vertices) != len(me0.vertices) or len(me.edges) != len(me0.edges):
self.report({'ERROR'}, "The topology of the object should be" +
"unaltered")
return {'CANCELLED'}
bm0 = bmesh.new()
bm0.from_mesh(me0)
bm = bmesh.new()
bm.from_mesh(me)
deformations = []
for e0, e in zip(bm0.edges, bm.edges):
try:
l0 = e0.calc_length()
l1 = e.calc_length()
epsilon = (l1 - l0)/l0
deformations.append(epsilon)
except: deformations.append(1)
v_deformations = []
for v in bm.verts:
vdef = []
for e in v.link_edges:
vdef.append(deformations[e.index])
if self.mode == 'MEAN': v_deformations.append(mean(vdef))
elif self.mode == 'MAX': v_deformations.append(max(vdef, key=abs))
#elif self.mode == 'MIN': v_deformations.append(min(vdef, key=abs))
if self.bounds == 'MANUAL':
min_def = self.min_def
max_def = self.max_def
elif self.bounds == 'AUTOMATIC':
min_def = min(v_deformations)
max_def = max(v_deformations)
self.min_def = min_def
self.max_def = max_def
elif self.bounds == 'COMPRESSION':
min_def = 0
max_def = min(v_deformations)
self.min_def = min_def
self.max_def = max_def
elif self.bounds == 'TENSION':
min_def = 0
max_def = max(v_deformations)
self.min_def = min_def
self.max_def = max_def
delta_def = max_def - min_def
# check undeformed errors
if delta_def == 0:
if self.bounds == 'MANUAL':
delta_def = 0.0001
else:
message = "The object doesn't have deformations."
if physics:
message = message + ("\nIf you are using Physics try to " +
"save it in the cache before.")
self.report({'ERROR'}, message)
return {'CANCELLED'}
else:
if physics:
self.frame = context.scene.frame_current
for i in range(len(v_deformations)):
weight = (v_deformations[i] - min_def)/delta_def
ob.vertex_groups[-1].add([i], weight, 'REPLACE')
self.bounds_string = str(round(min_def,2)) + " to " + str(round(max_def,2))
ob.vertex_groups[-1].name = group_name + " " + self.bounds_string
ob.vertex_groups.update()
ob.data.update()
bpy.ops.object.mode_set(mode='WEIGHT_PAINT')
bpy.data.meshes.remove(me)
return {'FINISHED'}
class edges_bending(bpy.types.Operator):
bl_idname = "object.edges_bending"
bl_label = "Edges Bending"
bl_description = ("Compute Weight based on the bending of edges"+
"according to visible modifiers.")
bl_options = {'REGISTER', 'UNDO'}
bounds : bpy.props.EnumProperty(
items=(('MANUAL', "Manual Bounds", ""),
('POSITIVE', "Positive Only", ""),
('NEGATIVE', "Negative Only", ""),
('UNSIGNED', "Absolute Bending", ""),
('AUTOMATIC', "Signed Bending", "")),
default='AUTOMATIC', name="Bounds")
min_def : bpy.props.FloatProperty(
name="Min", default=-10, soft_min=-45, soft_max=45,
description="Deformations with 0 weight")
max_def : bpy.props.FloatProperty(
name="Max", default=10, soft_min=-45, soft_max=45,
description="Deformations with 1 weight")
bounds_string = ""
frame = None
@classmethod
def poll(cls, context):
return len(context.object.modifiers) > 0
def draw(self, context):
layout = self.layout
layout.label(text="Bounds")
layout.prop(self, "bounds", text="")
if self.bounds == 'MANUAL':
layout.prop(self, "min_def")
layout.prop(self, "max_def")
def execute(self, context):
try: ob = context.object
except:
self.report({'ERROR'}, "Please select an Object")
return {'CANCELLED'}
group_name = "Edges Bending"
ob.vertex_groups.new(name=group_name)
# check if the object is Cloth or Softbody
physics = False
for m in ob.modifiers:
if m.type == 'CLOTH' or m.type == 'SOFT_BODY':
physics = True
if context.scene.frame_current == 1 and self.frame != None:
context.scene.frame_current = self.frame
break
if not physics: self.frame = None