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__init__.py
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__init__.py
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# Copyright (c) 2019 Andrew Cassidy
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
import bpy
bl_info = {
"name": "Apply Parent Inverse",
"author": "Andrew Cassidy",
"blender": (2, 80, 0),
"description": "Apply parent inverse without moving objects around",
"category": "Object"
}
class OBJECT_OT_apply_parent_inverse(bpy.types.Operator):
"""Apply Parent Inverse"""
bl_idname = "object.parent_apply"
bl_label = "Apply Parent Inverse"
bl_options = {'REGISTER', 'UNDO'}
def execute(self, context): # execute() is called when running the operator
obj = context.active_object
# code from https://blender.stackexchange.com/a/28897
# store a copy of the objects final transformation
# so we can read from it later.
ob_matrix_orig = obj.matrix_world.copy()
# reset parent inverse matrix
# (relationship created when parenting)
obj.matrix_parent_inverse.identity()
# re-apply the difference between parent/child
# (this writes directly into the loc/scale/rot) via a matrix.
obj.matrix_basis = obj.parent.matrix_world.inverted() @ ob_matrix_orig
return {'FINISHED'} # Lets Blender know the operator finished successfully.
def menu_func(self, context):
self.layout.operator(OBJECT_OT_apply_parent_inverse.bl_idname)
# store keymaps here to access after registration
addon_keymaps = []
def register():
bpy.utils.register_class(OBJECT_OT_apply_parent_inverse)
bpy.types.VIEW3D_MT_object.append(menu_func)
# handle the keymap
wm = bpy.context.window_manager
# Note that in background mode (no GUI available), keyconfigs are not available either,
# so we have to check this to avoid nasty errors in background case.
kc = wm.keyconfigs.addon
if kc:
km = wm.keyconfigs.addon.keymaps.new(name='Object Mode', space_type='EMPTY')
kmi = km.keymap_items.new(OBJECT_OT_apply_parent_inverse.bl_idname, 'P', 'PRESS', ctrl=False, shift=True, alt=True)
addon_keymaps.append((km, kmi))
def unregister():
# Note: when unregistering, it's usually good practice to do it in reverse order you registered.
# Can avoid strange issues like keymap still referring to operators already unregistered...
# handle the keymap
for km, kmi in addon_keymaps:
km.keymap_items.remove(kmi)
addon_keymaps.clear()
bpy.utils.unregister_class(OBJECT_OT_apply_parent_inverse)
bpy.types.VIEW3D_MT_object.remove(menu_func)
# This allows you to run the script directly from Blender's Text editor
# to test the add-on without having to install it.
if __name__ == "__main__":
register()