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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 #####
# <pep8-80 compliant>
from __future__ import annotations
from bpy.types import (
Operator,
)
from bpy.props import (
IntProperty,
)
class CONSTRAINT_OT_add_target(Operator):
"""Add a target to the constraint"""
bl_idname = "constraint.add_target"
bl_label = "Add Target"
bl_options = {'UNDO', 'INTERNAL'}
@classmethod
def poll(cls, context):
constraint = getattr(context, "constraint", None)
return constraint
def execute(self, context):
context.constraint.targets.new()
return {'FINISHED'}
class CONSTRAINT_OT_remove_target(Operator):
"""Remove the target from the constraint"""
bl_idname = "constraint.remove_target"
bl_label = "Remove Target"
bl_options = {'UNDO', 'INTERNAL'}
index: IntProperty()
@classmethod
def poll(cls, context):
constraint = getattr(context, "constraint", None)
return constraint
def execute(self, context):
tgts = context.constraint.targets
tgts.remove(tgts[self.index])
return {'FINISHED'}
class CONSTRAINT_OT_normalize_target_weights(Operator):
"""Normalize weights of all target bones"""
bl_idname = "constraint.normalize_target_weights"
bl_label = "Normalize Weights"
bl_options = {'UNDO', 'INTERNAL'}
@classmethod
def poll(cls, context):
constraint = getattr(context, "constraint", None)
return constraint
def execute(self, context):
tgts = context.constraint.targets
total = sum(t.weight for t in tgts)
if total > 0:
for t in tgts:
t.weight = t.weight / total
return {'FINISHED'}
class CONSTRAINT_OT_disable_keep_transform(Operator):
"""Set the influence of this constraint to zero while """ \
"""trying to maintain the object's transformation. Other active """ \
"""constraints can still influence the final transformation"""
bl_idname = "constraint.disable_keep_transform"
bl_label = "Disable and Keep Transform"
bl_options = {'UNDO', 'INTERNAL'}
@classmethod
def poll(cls, context):
constraint = getattr(context, "constraint", None)
return constraint and constraint.influence > 0.0
def execute(self, context):
"""Disable constraint while maintaining the visual transform."""
# This works most of the time, but when there are multiple constraints active
# there could still be one that overrides the visual transform.
#
# Note that executing this operator and then increasing the constraint
# influence may move the object; this happens when the constraint is
# additive rather than replacing the transform entirely.
# Get the matrix in world space.
is_bone_constraint = context.space_data.context == 'BONE_CONSTRAINT'
ob = context.object
if is_bone_constraint:
bone = context.pose_bone
mat = ob.matrix_world @ bone.matrix
else:
mat = ob.matrix_world
context.constraint.influence = 0.0
# Set the matrix.
if is_bone_constraint:
bone.matrix = ob.matrix_world.inverted() @ mat
else:
ob.matrix_world = mat
return {'FINISHED'}
classes = (
CONSTRAINT_OT_add_target,
CONSTRAINT_OT_remove_target,
CONSTRAINT_OT_normalize_target_weights,
CONSTRAINT_OT_disable_keep_transform,
)
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