forked from bartvdbraak/blender
238 lines
7.9 KiB
Python
238 lines
7.9 KiB
Python
# ##### BEGIN GPL LICENSE BLOCK #####
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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# ##### END GPL LICENSE BLOCK #####
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# <pep8 compliant>
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import bpy
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from rigify import RigifyError
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from rigify_utils import bone_class_instance, copy_bone_simple, add_pole_target_bone, get_side_name, get_base_name
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from Mathutils import Vector
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METARIG_NAMES = "hips", "thigh", "shin", "foot", "toe"
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def metarig_template():
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# generated by rigify.write_meta_rig
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bpy.ops.object.mode_set(mode='EDIT')
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obj = bpy.context.active_object
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arm = obj.data
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bone = arm.edit_bones.new('body')
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bone.head[:] = -0.0728, -0.2427, 0.0000
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bone.tail[:] = -0.0728, -0.2427, 0.2427
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bone.roll = 0.0000
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bone.connected = False
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bone = arm.edit_bones.new('thigh')
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bone.head[:] = 0.0000, 0.0000, -0.0000
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bone.tail[:] = 0.0813, -0.2109, -0.3374
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bone.roll = -0.4656
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bone.connected = False
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bone.parent = arm.edit_bones['body']
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bone = arm.edit_bones.new('shin')
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bone.head[:] = 0.0813, -0.2109, -0.3374
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bone.tail[:] = 0.0714, -0.0043, -0.5830
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bone.roll = -0.2024
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bone.connected = True
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bone.parent = arm.edit_bones['thigh']
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bone = arm.edit_bones.new('foot')
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bone.head[:] = 0.0714, -0.0043, -0.5830
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bone.tail[:] = 0.0929, -0.0484, -0.7652
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bone.roll = -0.3766
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bone.connected = True
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bone.parent = arm.edit_bones['shin']
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bone = arm.edit_bones.new('toe')
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bone.head[:] = 0.0929, -0.0484, -0.7652
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bone.tail[:] = 0.1146, -0.1244, -0.7652
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bone.roll = -0.0000
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bone.connected = True
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bone.parent = arm.edit_bones['foot']
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bpy.ops.object.mode_set(mode='OBJECT')
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pbone = obj.pose.bones['thigh']
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pbone['type'] = 'leg_quadruped'
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def metarig_definition(obj, orig_bone_name):
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'''
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The bone given is the first in a chain
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Expects a chain of at least 3 children.
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eg.
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thigh -> shin -> foot -> [toe, heel]
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'''
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bone_definition = []
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orig_bone = obj.data.bones[orig_bone_name]
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orig_bone_parent = orig_bone.parent
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if orig_bone_parent is None:
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raise RigifyError("expected the thigh bone to have a parent hip bone")
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bone_definition.append(orig_bone_parent.name)
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bone_definition.append(orig_bone.name)
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bone = orig_bone
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chain = 0
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while chain < 3: # first 2 bones only have 1 child
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children = bone.children
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if len(children) != 1:
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raise RigifyError("expected the thigh bone to have 3 children without a fork")
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bone = children[0]
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bone_definition.append(bone.name) # shin, foot
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chain += 1
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if len(bone_definition) != len(METARIG_NAMES):
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raise RigifyError("internal problem, expected %d bones" % len(METARIG_NAMES))
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return bone_definition
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def ik(obj, bone_definition, base_names, options):
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arm = obj.data
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bpy.ops.object.mode_set(mode='EDIT')
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# setup the existing bones, use names from METARIG_NAMES
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mt = bone_class_instance(obj, ["hips"])
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mt_chain = bone_class_instance(obj, ["thigh", "shin", "foot", "toe"])
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mt.attr_initialize(METARIG_NAMES, bone_definition)
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mt_chain.attr_initialize(METARIG_NAMES, bone_definition)
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ik_chain = mt_chain.copy(to_fmt="%s", base_names=base_names)
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ik_chain.thigh_e.connected = False
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ik_chain.thigh_e.parent = mt.hips_e
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ik_chain.foot_e.parent = None
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ik_chain.rename("foot", get_base_name(ik_chain.foot) + "_ik" + get_side_name(ik_chain.foot))
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# keep the foot_ik as the parent
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ik_chain.toe_e.connected = False
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# must be after disconnecting the toe
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ik_chain.foot_e.align_orientation(mt_chain.toe_e)
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# children of ik_foot
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ik = bone_class_instance(obj, ["foot_roll", "foot_roll_01", "foot_roll_02", "knee_target", "foot_target"])
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ik.knee_target = add_pole_target_bone(obj, mt_chain.shin, "knee_target" + get_side_name(base_names[mt_chain.foot])) #XXX - pick a better name
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ik.update()
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ik.knee_target_e.parent = mt.hips_e
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# foot roll is an interesting one!
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# plot a vector from the toe bones head, bactwards to the length of the foot
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# then align it with the foot but reverse direction.
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ik.foot_roll_e = copy_bone_simple(arm, mt_chain.toe, get_base_name(base_names[mt_chain.foot]) + "_roll" + get_side_name(base_names[mt_chain.foot]))
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ik.foot_roll = ik.foot_roll_e.name
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ik.foot_roll_e.parent = ik_chain.foot_e
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ik.foot_roll_e.translate(- (mt_chain.toe_e.vector.normalize() * mt_chain.foot_e.length))
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ik.foot_roll_e.align_orientation(mt_chain.foot_e)
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ik.foot_roll_e.tail = ik.foot_roll_e.head - ik.foot_roll_e.vector # flip
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ik.foot_roll_e.align_roll(mt_chain.foot_e.matrix.rotationPart() * Vector(0.0, 0.0, -1.0))
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# MCH-foot
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ik.foot_roll_01_e = copy_bone_simple(arm, mt_chain.foot, "MCH-" + base_names[mt_chain.foot])
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ik.foot_roll_01 = ik.foot_roll_01_e.name
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ik.foot_roll_01_e.parent = ik_chain.foot_e
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ik.foot_roll_01_e.head, ik.foot_roll_01_e.tail = mt_chain.foot_e.tail, mt_chain.foot_e.head
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ik.foot_roll_01_e.roll = ik.foot_roll_e.roll
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# ik_target, child of MCH-foot
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ik.foot_target_e = copy_bone_simple(arm, mt_chain.foot, "MCH-" + base_names[mt_chain.foot] + "_ik_target")
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ik.foot_target = ik.foot_target_e.name
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ik.foot_target_e.parent = ik.foot_roll_01_e
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ik.foot_target_e.align_orientation(ik_chain.foot_e)
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ik.foot_target_e.length = ik_chain.foot_e.length / 2.0
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ik.foot_target_e.connected = True
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# MCH-foot.02 child of MCH-foot
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ik.foot_roll_02_e = copy_bone_simple(arm, mt_chain.foot, "MCH-%s_02" % base_names[mt_chain.foot])
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ik.foot_roll_02 = ik.foot_roll_02_e.name
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ik.foot_roll_02_e.parent = ik.foot_roll_01_e
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bpy.ops.object.mode_set(mode='OBJECT')
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mt.update()
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mt_chain.update()
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ik.update()
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ik_chain.update()
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# simple constraining of orig bones
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con = mt_chain.thigh_p.constraints.new('COPY_TRANSFORMS')
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con.target = obj
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con.subtarget = ik_chain.thigh
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con = mt_chain.shin_p.constraints.new('COPY_TRANSFORMS')
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con.target = obj
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con.subtarget = ik_chain.shin
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con = mt_chain.foot_p.constraints.new('COPY_TRANSFORMS')
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con.target = obj
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con.subtarget = ik.foot_roll_02
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con = mt_chain.toe_p.constraints.new('COPY_TRANSFORMS')
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con.target = obj
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con.subtarget = ik_chain.toe
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# others...
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con = ik.foot_roll_01_p.constraints.new('COPY_ROTATION')
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con.target = obj
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con.subtarget = ik.foot_roll
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# IK
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con = ik_chain.shin_p.constraints.new('IK')
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con.chain_length = 2
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con.iterations = 500
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con.pole_angle = -90.0 # XXX - in deg!
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con.use_tail = True
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con.use_stretch = True
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con.use_target = True
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con.use_rotation = False
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con.weight = 1.0
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con.target = obj
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con.subtarget = ik.foot_target
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con.pole_target = obj
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con.pole_subtarget = ik.knee_target
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ik.update()
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ik_chain.update()
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# Set layers of the bones.
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if "ik_layer" in options:
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layer = [n==options["ik_layer"] for n in range(0,32)]
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else:
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layer = list(mt_chain.thigh_b.layer)
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for attr in ik_chain.attr_names:
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obj.data.bones[getattr(ik_chain, attr)].layer = layer
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for attr in ik.attr_names:
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obj.data.bones[getattr(ik, attr)].layer = layer
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return None, ik_chain.thigh, ik_chain.shin, ik_chain.foot, ik_chain.toe
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def main(obj, bone_definition, base_names, options):
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bones_ik = ik(obj, bone_definition, base_names, options)
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return bones_ik
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