blender/release/scripts/modules/rigify/eye_lid.py
Campbell Barton 67cfc427ee PyAPI
- added new mathutils.Color() type, use with rna so we can do for eg:
 material.diffuse_color.r = 1.0
 # also has hsv access
 material.diffuse_color.s = 0.6

 - made Mathutils and Geometry module names lowercase.
2010-04-11 14:22:27 +00:00

687 lines
22 KiB
Python

# ##### 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>
import bpy
from rna_prop_ui import rna_idprop_ui_prop_get
from math import acos
from mathutils import Vector
from rigify import RigifyError
from rigify_utils import copy_bone_simple
#METARIG_NAMES = ("cpy",)
RIG_TYPE = "eye_lid"
def mark_actions():
for action in bpy.data.actions:
action.tag = True
def get_unmarked_action():
for action in bpy.data.actions:
if action.tag != True:
return action
return None
def add_action(name=None):
mark_actions()
bpy.ops.action.new()
action = get_unmarked_action()
if name is not None:
action.name = name
return action
def metarig_template():
# generated by rigify.write_meta_rig
bpy.ops.object.mode_set(mode='EDIT')
obj = bpy.context.active_object
arm = obj.data
bone = arm.edit_bones.new('Bone')
bone.head[:] = 0.0000, 0.0000, 0.0000
bone.tail[:] = 0.0000, 0.0000, 1.0000
bone.roll = 0.0000
bone.connected = False
bpy.ops.object.mode_set(mode='OBJECT')
pbone = obj.pose.bones['Bone']
pbone['type'] = 'copy'
def metarig_definition(obj, orig_bone_name):
bb = obj.data.bones
bone = bb[orig_bone_name]
chain = []
try:
chain += [bone.parent.parent.name, bone.parent.name, bone.name]
except AttributeError:
raise RigifyError("'%s' rig type requires a chain of two parents (bone: %s)" % (RIG_TYPE, orig_bone_name))
chain += [child.name for child in bone.children_recursive_basename]
if len(chain) < 10:
raise RigifyError("'%s' rig type requires a chain of 10 bones (bone: %s)" % (RIG_TYPE, orig_bone_name))
chain = chain[:10]
try:
chain += [bb[chain[9]].children[0].name]
chain += [bb[chain[10]].children[0].name]
except IndexError:
raise RigifyError("'%s' rig type requires a chain of 10 bones (bone: %s)" % (RIG_TYPE, orig_bone_name))
return chain
def deform(obj, definitions, base_names, options):
bpy.ops.object.mode_set(mode='EDIT')
eb = obj.data.edit_bones
pb = obj.pose.bones
# Upper lid MCH
lid1 = make_lid_stretch_bone(obj, "MCH-lid", definitions[2], definitions[3], 1.0)
lid2 = make_lid_stretch_bone(obj, "MCH-lid", definitions[3], definitions[4], 1.0)
lid22 = make_lid_stretch_bone(obj, "MCH-lid", definitions[4], definitions[5], 1.0)
lid33 = make_lid_stretch_bone(obj, "MCH-lid", definitions[4], definitions[3], 1.0)
lid3 = make_lid_stretch_bone(obj, "MCH-lid", definitions[5], definitions[4], 1.0)
lid4 = make_lid_stretch_bone(obj, "MCH-lid", definitions[6], definitions[5], 1.0)
dlid22 = copy_bone_simple(obj.data, lid22, "MCH-lid", parent=True).name
dlid33 = copy_bone_simple(obj.data, lid33, "MCH-lid", parent=True).name
eb[dlid22].bbone_segments = 8
eb[dlid33].bbone_segments = 8
eb[lid1].parent = eb[definitions[2]]
eb[lid2].parent = eb[definitions[3]]
eb[lid22].parent = eb[definitions[4]]
eb[lid33].parent = eb[definitions[4]]
eb[lid3].parent = eb[definitions[5]]
eb[lid4].parent = eb[definitions[6]]
# Lower lid MCH
lid5 = make_lid_stretch_bone(obj, "MCH-lid", definitions[6], definitions[7], 1.0)
lid6 = make_lid_stretch_bone(obj, "MCH-lid", definitions[7], definitions[8], 1.0)
lid66 = make_lid_stretch_bone(obj, "MCH-lid", definitions[8], definitions[9], 1.0)
lid77 = make_lid_stretch_bone(obj, "MCH-lid", definitions[8], definitions[7], 1.0)
lid7 = make_lid_stretch_bone(obj, "MCH-lid", definitions[9], definitions[8], 1.0)
lid8 = make_lid_stretch_bone(obj, "MCH-lid", definitions[2], definitions[9], 1.0)
dlid66 = copy_bone_simple(obj.data, lid66, "MCH-lid", parent=True).name
dlid77 = copy_bone_simple(obj.data, lid77, "MCH-lid", parent=True).name
eb[dlid66].bbone_segments = 8
eb[dlid77].bbone_segments = 8
eb[lid5].parent = eb[definitions[6]]
eb[lid6].parent = eb[definitions[7]]
eb[lid66].parent = eb[definitions[8]]
eb[lid77].parent = eb[definitions[8]]
eb[lid7].parent = eb[definitions[9]]
eb[lid8].parent = eb[definitions[2]]
# Upper lid DEF
dlid1 = copy_bone_simple(obj.data, lid1, "DEF-" + base_names[definitions[2]], parent=True).name
dlid2 = copy_bone_simple(obj.data, lid2, "DEF-" + base_names[definitions[3]], parent=True).name
dlid3 = copy_bone_simple(obj.data, lid3, "DEF-" + base_names[definitions[4]], parent=True).name
dlid4 = copy_bone_simple(obj.data, lid4, "DEF-" + base_names[definitions[5]], parent=True).name
eb[dlid2].parent = eb[dlid1]
eb[dlid22].parent = eb[dlid2]
eb[dlid3].parent = eb[dlid4]
eb[dlid33].parent = eb[dlid3]
eb[dlid2].connected = True
eb[dlid22].connected = True
eb[dlid3].connected = True
eb[dlid33].connected = True
eb[dlid1].bbone_segments = 8
eb[dlid2].bbone_segments = 8
eb[dlid3].bbone_segments = 8
eb[dlid4].bbone_segments = 8
# Lower lid DEF
dlid5 = copy_bone_simple(obj.data, lid5, "DEF-" + base_names[definitions[6]], parent=True).name
dlid6 = copy_bone_simple(obj.data, lid6, "DEF-" + base_names[definitions[7]], parent=True).name
dlid7 = copy_bone_simple(obj.data, lid7, "DEF-" + base_names[definitions[8]], parent=True).name
dlid8 = copy_bone_simple(obj.data, lid8, "DEF-" + base_names[definitions[9]], parent=True).name
eb[dlid6].parent = eb[dlid5]
eb[dlid66].parent = eb[dlid6]
eb[dlid7].parent = eb[dlid8]
eb[dlid77].parent = eb[dlid7]
eb[dlid6].connected = True
eb[dlid66].connected = True
eb[dlid7].connected = True
eb[dlid77].connected = True
eb[dlid5].bbone_segments = 8
eb[dlid6].bbone_segments = 8
eb[dlid7].bbone_segments = 8
eb[dlid8].bbone_segments = 8
bpy.ops.object.mode_set(mode='OBJECT')
# Constraints
con = pb[dlid1].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = lid1
con = pb[dlid22].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = lid22
con = pb[dlid33].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = lid33
con = pb[dlid2].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = lid2
con = pb[dlid3].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = lid3
con = pb[dlid4].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = lid4
con = pb[dlid5].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = lid5
con = pb[dlid6].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = lid6
con = pb[dlid66].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = lid66
con = pb[dlid77].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = lid77
con = pb[dlid7].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = lid7
con = pb[dlid8].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = lid8
return (None,)
def control(obj, definitions, base_names, options):
bpy.ops.object.mode_set(mode='EDIT')
eb = obj.data.edit_bones
bb = obj.data.bones
pb = obj.pose.bones
head_e = eb[definitions[0]]
eye_e = eb[definitions[1]]
# Make eye "flower"
flo1 = copy_bone_simple(obj.data, definitions[1], "MCH-"+base_names[definitions[2]]+".flower", parent=True).name
flo2 = copy_bone_simple(obj.data, definitions[1], "MCH-"+base_names[definitions[3]]+".flower", parent=True).name
flo3 = copy_bone_simple(obj.data, definitions[1], "MCH-"+base_names[definitions[4]]+".flower", parent=True).name
flo4 = copy_bone_simple(obj.data, definitions[1], "MCH-"+base_names[definitions[5]]+".flower", parent=True).name
flo5 = copy_bone_simple(obj.data, definitions[1], "MCH-"+base_names[definitions[6]]+".flower", parent=True).name
flo6 = copy_bone_simple(obj.data, definitions[1], "MCH-"+base_names[definitions[7]]+".flower", parent=True).name
flo7 = copy_bone_simple(obj.data, definitions[1], "MCH-"+base_names[definitions[8]]+".flower", parent=True).name
flo8 = copy_bone_simple(obj.data, definitions[1], "MCH-"+base_names[definitions[9]]+".flower", parent=True).name
eb[flo1].tail = eb[definitions[2]].head
eb[flo2].tail = eb[definitions[3]].head
eb[flo3].tail = eb[definitions[4]].head
eb[flo4].tail = eb[definitions[5]].head
eb[flo5].tail = eb[definitions[6]].head
eb[flo6].tail = eb[definitions[7]].head
eb[flo7].tail = eb[definitions[8]].head
eb[flo8].tail = eb[definitions[9]].head
# Make eye lids on tips of flowers
flid1 = copy_bone_simple(obj.data, definitions[2], "MCH-"+base_names[definitions[2]]).name
flid2 = copy_bone_simple(obj.data, definitions[3], "MCH-"+base_names[definitions[3]]).name
flid3 = copy_bone_simple(obj.data, definitions[4], "MCH-"+base_names[definitions[4]]).name
flid4 = copy_bone_simple(obj.data, definitions[5], "MCH-"+base_names[definitions[5]]).name
flid5 = copy_bone_simple(obj.data, definitions[6], "MCH-"+base_names[definitions[6]]).name
flid6 = copy_bone_simple(obj.data, definitions[7], "MCH-"+base_names[definitions[7]]).name
flid7 = copy_bone_simple(obj.data, definitions[8], "MCH-"+base_names[definitions[8]]).name
flid8 = copy_bone_simple(obj.data, definitions[9], "MCH-"+base_names[definitions[9]]).name
eb[flid1].parent = eb[flo1]
eb[flid2].parent = eb[flo2]
eb[flid3].parent = eb[flo3]
eb[flid4].parent = eb[flo4]
eb[flid5].parent = eb[flo5]
eb[flid6].parent = eb[flo6]
eb[flid7].parent = eb[flo7]
eb[flid8].parent = eb[flo8]
# Make eye lid controls
lid1 = copy_bone_simple(obj.data, definitions[2], base_names[definitions[2]]).name
lid2 = copy_bone_simple(obj.data, definitions[3], base_names[definitions[3]]).name
lid3 = copy_bone_simple(obj.data, definitions[4], base_names[definitions[4]]).name
lid4 = copy_bone_simple(obj.data, definitions[5], base_names[definitions[5]]).name
lid5 = copy_bone_simple(obj.data, definitions[6], base_names[definitions[6]]).name
lid6 = copy_bone_simple(obj.data, definitions[7], base_names[definitions[7]]).name
lid7 = copy_bone_simple(obj.data, definitions[8], base_names[definitions[8]]).name
lid8 = copy_bone_simple(obj.data, definitions[9], base_names[definitions[9]]).name
size = eb[lid1].length
eb[lid1].tail = eb[lid1].head + Vector(0,size,0)
eb[lid2].tail = eb[lid2].head + Vector(0,size,0)
eb[lid3].tail = eb[lid3].head + Vector(0,size,0)
eb[lid4].tail = eb[lid4].head + Vector(0,size,0)
eb[lid5].tail = eb[lid5].head + Vector(0,size,0)
eb[lid6].tail = eb[lid6].head + Vector(0,size,0)
eb[lid7].tail = eb[lid7].head + Vector(0,size,0)
eb[lid8].tail = eb[lid8].head + Vector(0,size,0)
eb[lid1].roll = 0
eb[lid2].roll = 0
eb[lid3].roll = 0
eb[lid4].roll = 0
eb[lid5].roll = 0
eb[lid6].roll = 0
eb[lid7].roll = 0
eb[lid8].roll = 0
eb[lid1].parent = head_e
eb[lid2].parent = head_e
eb[lid3].parent = head_e
eb[lid4].parent = head_e
eb[lid5].parent = head_e
eb[lid6].parent = head_e
eb[lid7].parent = head_e
eb[lid8].parent = head_e
lower_lid_ctrl = copy_bone_simple(obj.data, definitions[10], base_names[definitions[10]]).name
upper_lid_ctrl = copy_bone_simple(obj.data, definitions[11], base_names[definitions[11]]).name
eb[lower_lid_ctrl].parent = head_e
eb[upper_lid_ctrl].parent = head_e
distance = (eb[lower_lid_ctrl].head - eb[upper_lid_ctrl].head).length
bpy.ops.object.mode_set(mode='OBJECT')
# Axis locks
pb[lower_lid_ctrl].lock_location = True, False, True
pb[upper_lid_ctrl].lock_location = True, False, True
# Add eye close action if it doesn't already exist
action_name = "eye_close"
if action_name in bpy.data.actions:
close_action = bpy.data.actions[action_name]
else:
close_action = add_action(name=action_name)
# Add close property (useful when making the animation in the action)
prop_name = "close_action"
prop = rna_idprop_ui_prop_get(pb[upper_lid_ctrl], prop_name, create=True)
pb[upper_lid_ctrl][prop_name] = 1.0
prop["soft_min"] = 0.0
prop["soft_max"] = 1.0
prop["min"] = 0.0
prop["max"] = 1.0
close_driver_path = pb[upper_lid_ctrl].path_from_id() + '["close_action"]'
# Constraints
# Flowers track lid controls
con = pb[flo1].constraints.new('DAMPED_TRACK')
con.target = obj
con.subtarget = lid1
con = pb[flo2].constraints.new('DAMPED_TRACK')
con.target = obj
con.subtarget = lid2
con = pb[flo3].constraints.new('DAMPED_TRACK')
con.target = obj
con.subtarget = lid3
con = pb[flo4].constraints.new('DAMPED_TRACK')
con.target = obj
con.subtarget = lid4
con = pb[flo5].constraints.new('DAMPED_TRACK')
con.target = obj
con.subtarget = lid5
con = pb[flo6].constraints.new('DAMPED_TRACK')
con.target = obj
con.subtarget = lid6
con = pb[flo7].constraints.new('DAMPED_TRACK')
con.target = obj
con.subtarget = lid7
con = pb[flo8].constraints.new('DAMPED_TRACK')
con.target = obj
con.subtarget = lid8
# ORG bones to flower lids
con = pb[definitions[2]].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = flid1
con = pb[definitions[3]].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = flid2
con = pb[definitions[4]].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = flid3
con = pb[definitions[5]].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = flid4
con = pb[definitions[6]].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = flid5
con = pb[definitions[7]].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = flid6
con = pb[definitions[8]].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = flid7
con = pb[definitions[9]].constraints.new('COPY_TRANSFORMS')
con.target = obj
con.subtarget = flid8
# Action constraints, upper lid
con = pb[lid1].constraints.new('ACTION')
con.target = obj
con.subtarget = upper_lid_ctrl
con.action = close_action
con.transform_channel = 'LOCATION_Y'
con.frame_start = -30
con.frame_end = 30
con.minimum = -distance*2
con.maximum = distance
con.target_space = 'LOCAL'
fcurve = con.driver_add("influence", 0)
driver = fcurve.driver
driver.type = 'AVERAGE'
var = driver.variables.new()
var.targets[0].id_type = 'OBJECT'
var.targets[0].id = obj
var.targets[0].data_path = close_driver_path
con = pb[lid2].constraints.new('ACTION')
con.target = obj
con.subtarget = upper_lid_ctrl
con.action = close_action
con.transform_channel = 'LOCATION_Y'
con.frame_start = -30
con.frame_end = 30
con.minimum = -distance*2
con.maximum = distance
con.target_space = 'LOCAL'
fcurve = con.driver_add("influence", 0)
driver = fcurve.driver
driver.type = 'AVERAGE'
var = driver.variables.new()
var.targets[0].id_type = 'OBJECT'
var.targets[0].id = obj
var.targets[0].data_path = close_driver_path
con = pb[lid3].constraints.new('ACTION')
con.target = obj
con.subtarget = upper_lid_ctrl
con.action = close_action
con.transform_channel = 'LOCATION_Y'
con.frame_start = -30
con.frame_end = 30
con.minimum = -distance*2
con.maximum = distance
con.target_space = 'LOCAL'
fcurve = con.driver_add("influence", 0)
driver = fcurve.driver
driver.type = 'AVERAGE'
var = driver.variables.new()
var.targets[0].id_type = 'OBJECT'
var.targets[0].id = obj
var.targets[0].data_path = close_driver_path
con = pb[lid4].constraints.new('ACTION')
con.target = obj
con.subtarget = upper_lid_ctrl
con.action = close_action
con.transform_channel = 'LOCATION_Y'
con.frame_start = -30
con.frame_end = 30
con.minimum = -distance*2
con.maximum = distance
con.target_space = 'LOCAL'
fcurve = con.driver_add("influence", 0)
driver = fcurve.driver
driver.type = 'AVERAGE'
var = driver.variables.new()
var.targets[0].id_type = 'OBJECT'
var.targets[0].id = obj
var.targets[0].data_path = close_driver_path
con = pb[lid5].constraints.new('ACTION')
con.target = obj
con.subtarget = upper_lid_ctrl
con.action = close_action
con.transform_channel = 'LOCATION_Y'
con.frame_start = -30
con.frame_end = 30
con.minimum = -distance*2
con.maximum = distance
con.target_space = 'LOCAL'
fcurve = con.driver_add("influence", 0)
driver = fcurve.driver
driver.type = 'AVERAGE'
var = driver.variables.new()
var.targets[0].id_type = 'OBJECT'
var.targets[0].id = obj
var.targets[0].data_path = close_driver_path
# Action constraints, lower lid
con = pb[lid5].constraints.new('ACTION')
con.target = obj
con.subtarget = lower_lid_ctrl
con.action = close_action
con.transform_channel = 'LOCATION_Y'
con.frame_start = -30
con.frame_end = 30
con.minimum = -distance
con.maximum = distance*2
con.target_space = 'LOCAL'
fcurve = con.driver_add("influence", 0)
driver = fcurve.driver
driver.type = 'AVERAGE'
var = driver.variables.new()
var.targets[0].id_type = 'OBJECT'
var.targets[0].id = obj
var.targets[0].data_path = close_driver_path
con = pb[lid6].constraints.new('ACTION')
con.target = obj
con.subtarget = lower_lid_ctrl
con.action = close_action
con.transform_channel = 'LOCATION_Y'
con.frame_start = -30
con.frame_end = 30
con.minimum = -distance
con.maximum = distance*2
con.target_space = 'LOCAL'
fcurve = con.driver_add("influence", 0)
driver = fcurve.driver
driver.type = 'AVERAGE'
var = driver.variables.new()
var.targets[0].id_type = 'OBJECT'
var.targets[0].id = obj
var.targets[0].data_path = close_driver_path
con = pb[lid7].constraints.new('ACTION')
con.target = obj
con.subtarget = lower_lid_ctrl
con.action = close_action
con.transform_channel = 'LOCATION_Y'
con.frame_start = -30
con.frame_end = 30
con.minimum = -distance
con.maximum = distance*2
con.target_space = 'LOCAL'
fcurve = con.driver_add("influence", 0)
driver = fcurve.driver
driver.type = 'AVERAGE'
var = driver.variables.new()
var.targets[0].id_type = 'OBJECT'
var.targets[0].id = obj
var.targets[0].data_path = close_driver_path
con = pb[lid8].constraints.new('ACTION')
con.target = obj
con.subtarget = lower_lid_ctrl
con.action = close_action
con.transform_channel = 'LOCATION_Y'
con.frame_start = -30
con.frame_end = 30
con.minimum = -distance
con.maximum = distance*2
con.target_space = 'LOCAL'
fcurve = con.driver_add("influence", 0)
driver = fcurve.driver
driver.type = 'AVERAGE'
var = driver.variables.new()
var.targets[0].id_type = 'OBJECT'
var.targets[0].id = obj
var.targets[0].data_path = close_driver_path
con = pb[lid1].constraints.new('ACTION')
con.target = obj
con.subtarget = lower_lid_ctrl
con.action = close_action
con.transform_channel = 'LOCATION_Y'
con.frame_start = -30
con.frame_end = 30
con.minimum = -distance
con.maximum = distance*2
con.target_space = 'LOCAL'
fcurve = con.driver_add("influence", 0)
driver = fcurve.driver
driver.type = 'AVERAGE'
var = driver.variables.new()
var.targets[0].id_type = 'OBJECT'
var.targets[0].id = obj
var.targets[0].data_path = close_driver_path
# Set layers
layer = list(bb[definitions[2]].layer)
bb[lid1].layer = layer
bb[lid2].layer = layer
bb[lid3].layer = layer
bb[lid4].layer = layer
bb[lid5].layer = layer
bb[lid6].layer = layer
bb[lid7].layer = layer
bb[lid8].layer = layer
return (None,)
def main(obj, bone_definition, base_names, options):
# Create control rig
control(obj, bone_definition, base_names, options)
# Create deform rig
deform(obj, bone_definition, base_names, options)
return (None,)
def make_lid_stretch_bone(obj, name, bone1, bone2, roll_alpha):
eb = obj.data.edit_bones
pb = obj.pose.bones
# Create the bone, pointing from bone1 to bone2
bone_e = copy_bone_simple(obj.data, bone1, name, parent=True)
bone_e.connected = False
bone_e.tail = eb[bone2].head
bone = bone_e.name
# Align the bone roll with the average direction of bone1 and bone2
vec = bone_e.y_axis.cross(((1.0-roll_alpha)*eb[bone1].y_axis) + (roll_alpha*eb[bone2].y_axis)).normalize()
ang = acos(vec * bone_e.x_axis)
bone_e.roll += ang
c1 = vec * bone_e.x_axis
bone_e.roll -= (ang*2)
c2 = vec * bone_e.x_axis
if c1 > c2:
bone_e.roll += (ang*2)
bpy.ops.object.mode_set(mode='OBJECT')
bone_p = pb[bone]
# Constrains
con = bone_p.constraints.new('COPY_LOCATION')
con.target = obj
con.subtarget = bone1
con = bone_p.constraints.new('DAMPED_TRACK')
con.target = obj
con.subtarget = bone2
con = bone_p.constraints.new('STRETCH_TO')
con.target = obj
con.subtarget = bone2
con.volume = 'NO_VOLUME'
bpy.ops.object.mode_set(mode='EDIT')
return bone