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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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Preamble
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How to Apply These Terms to Your New Programs
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Also add information on how to contact you by electronic and paper mail.
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The hypothetical commands `show w' and `show c' should show the appropriate
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For more information on this, and how to apply and follow the GNU GPL, see
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The GNU General Public License does not permit incorporating your program
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# Bone Gizmos
This add-on is a prototype for a potential future Mesh Gizmos feature in Blender. See [this](https://projects.blender.org/blender/blender/issues/92218) task for more details.
You can find the documentation [here](https://studio.blender.org/tools/addons/bone_gizmos).
scripts/addons/bone_gizmos/__init__.py
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# SPDX-FileCopyrightText: 2025 Blender Studio Tools Authors
#
# SPDX-License-Identifier: GPL-3.0-or-later
import importlib
from bpy.utils import register_class, unregister_class
from . import bone_gizmo_properties
from . import bone_gizmo
from . import bone_gizmo_ui
from . import bone_gizmo_group
from . import operators
from bpy.props import FloatProperty, IntProperty
from bpy.types import AddonPreferences
bl_info = {
'name' : "Bone Gizmos",
'author': "Demeter Dzadik",
"version": (0, 0, 3),
'blender' : (3, 0, 0),
'description' : "Mesh-based armature interaction system",
'location': "Properties->Bone->Viewport Display->Custom Gizmo",
'category': 'Rigging',
# 'doc_url' : "https://gitlab.com/blender/CloudRig/",
}
modules = (
bone_gizmo_properties,
bone_gizmo,
bone_gizmo_ui,
bone_gizmo_group,
operators,
)
class BoneGizmoPreferences(AddonPreferences):
bl_idname = __package__
mesh_alpha: FloatProperty(
name = "Mesh Gizmo Opacity"
,description = "Opacity of unselected gizmos when they are defined by a vertex group or face map"
,min = 0.0
,max = 1.0
,default = 0.0
,subtype = 'FACTOR'
)
widget_alpha: FloatProperty(
name = "Widget Gizmo Opacity"
,description = "Opacity of unselected gizmos when they are NOT defined by a vertex group or face map"
,min = 0.1
,max = 1.0
,default = 0.5
,subtype = 'FACTOR'
)
delta_alpha_select: FloatProperty(
name = "Gizmo Selected Opacity Delta"
,description = "Added Mesh Gizmo opacity when selected"
,min = 0.0
,max = 0.5
,default = 0.2
,subtype = 'FACTOR'
)
delta_alpha_highlight: FloatProperty(
name = "Gizmo Highlighted Opacity Delta"
,description = "Added Mesh Gizmo opacity when highlighted"
,min = 0.0
,max = 0.5
,default = 0.1
,subtype = 'FACTOR'
)
line_width: IntProperty(
name = "Line Width"
,description = "Thickness of the drawn lines in pixels"
,min = 1
,max = 10
,default = 1
)
def draw(self, context):
layout = self.layout
layout.use_property_split = True
layout = layout.column(align=True)
layout.prop(self, 'line_width', slider=True)
layout.label(text="Gizmo Opacity")
layout.prop(self, 'mesh_alpha', text="Mesh")
layout.prop(self, 'widget_alpha', text="Widget")
layout.prop(self, 'delta_alpha_select', text="Delta Selected")
layout.prop(self, 'delta_alpha_highlight', text="Delta Highlighted")
def register():
register_class(BoneGizmoPreferences)
for m in modules:
importlib.reload(m)
if hasattr(m, 'registry'):
for c in m.registry:
register_class(c)
if hasattr(m, 'register'):
m.register()
def unregister():
unregister_class(BoneGizmoPreferences)
for m in reversed(modules):
if hasattr(m, 'unregister'):
m.unregister()
if hasattr(m, 'registry'):
for c in m.registry:
unregister_class(c)
scripts/addons/bone_gizmos/blender_manifest.toml
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schema_version = "1.0.0"
id = "bone_gizmos"
version = "0.0.3"
name = "Bone Gizmos"
tagline = "Mesh-based armature interaction system"
maintainer = "Demeter Dzadik <demeter@blender.org>"
type = "add-on"
website = "https://studio.blender.org/tools/addons/bone_gizmos"
tags = ["Rigging"]
blender_version_min = "4.2.0"
license = [
"SPDX:GPL-3.0-or-later",
]
copyright = [
"2019-2025 Demeter Dzadik & Blender Studio",
]
scripts/addons/bone_gizmos/bone_gizmo.py
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# SPDX-FileCopyrightText: 2025 Blender Studio Tools Authors
#
# SPDX-License-Identifier: GPL-3.0-or-later
import bpy
from mathutils import Matrix, Euler
from bpy.types import Gizmo
import numpy as np
import gpu
from .shapes import MeshShape3D
from .utils import get_addon_prefs
# Let's fucking do it.
is_interacting = False
class MoveBoneGizmo(Gizmo):
"""In order to avoid re-implementing logic for transforming bones with
mouse movements, this gizmo instead binds its offset value to the
bpy.ops.transform.translate operator, giving us all that behaviour for free.
(Important behaviours like auto-keying, precision, snapping, axis locking, etc)
The downside of this is that we can't customize that behaviour very well,
for example we can't get the gizmo to draw during mouse interaction,
we can't hide the mouse cursor, etc. Minor sacrifices.
"""
bl_idname = "GIZMO_GT_bone_gizmo"
# The id must be "offset"
bl_target_properties = (
{"id": "offset", "type": 'FLOAT', "array_length": 3},
)
__slots__ = (
# This __slots__ thing allows us to use arbitrary Python variable
# assignments on instances of this gizmo.
"bone_name" # Name of the bone that owns this gizmo.
,"custom_shape" # Currently drawn shape, being passed into self.new_custom_shape().
,"meshshape" # Cache of vertex indicies. Can fall out of sync if the mesh is modified; Only re-calculated when gizmo properties are changed by user.
# Gizmos, like bones, have 3 states.
,"color_selected"
,"color_unselected"
,"alpha_selected"
,"alpha_unselected"
# The 3rd one is "highlighted".
# color_highlight and alpha_highlight are already provided by the API.
# We currently don't visually distinguish between selected and active gizmos.
)
def setup(self):
"""Called by Blender when the Gizmo is created."""
self.meshshape = None
self.custom_shape = None
def init_shape(self, context):
"""Should be called by the GizmoGroup, after it assigns the neccessary
__slots__ properties to properly initialize this Gizmo."""
if not self.poll(context):
return
props = self.get_props(context)
if self.is_using_vgroup(context):
self.load_shape_vertex_group(self.get_shape_object(context), props.vertex_group_name)
dg = context.evaluated_depsgraph_get()
ob = self.get_shape_object(context)
self.refresh_shape_vgroup(context, ob.evaluated_get(dg).to_mesh())
elif self.is_using_facemap(context):
# We use the built-in function to draw face maps, so we don't need to do any extra processing.
pass
else:
self.load_shape_entire_object(context)
def init_properties(self, context):
self.refresh_colors(context)
def refresh_colors(self, context):
prefs = get_addon_prefs(context)
self.line_width = prefs.line_width
props = self.get_props(context)
if self.is_using_bone_group_colors(context):
pb = self.get_pose_bone(context)
self.color_unselected = pb.bone_group.colors.normal[:]
self.color_selected = pb.bone_group.colors.select[:]
self.color_highlight = pb.bone_group.colors.select[:]
else:
self.color_unselected = props.color[:]
self.color_selected = props.color_highlight[:]
self.color_highlight = props.color_highlight[:]
if self.is_using_facemap(context) or self.is_using_vgroup(context):
self.alpha_unselected = prefs.mesh_alpha
self.alpha_selected = prefs.mesh_alpha + prefs.delta_alpha_select
self.alpha_highlight = min(0.999, self.alpha_selected + prefs.delta_alpha_highlight)
else:
self.alpha_unselected = prefs.widget_alpha
self.alpha_selected = prefs.widget_alpha + prefs.delta_alpha_select
self.alpha_highlight = min(0.999, self.alpha_selected + prefs.delta_alpha_highlight)
def poll(self, context):
"""Whether any gizmo logic should be executed or not. This function is not
from the API! Call this manually for early exists.
"""
global is_interacting
if is_interacting:
return False
pb = self.get_pose_bone(context)
if not pb or pb.bone.hide: return False
any_visible_layer = any(bl and al for bl, al in zip(pb.bone.layers[:], pb.id_data.data.layers[:]))
bone_visible = not pb.bone.hide and any_visible_layer
ret = self.get_shape_object(context) and bone_visible and pb.enable_bone_gizmo
return ret
def load_shape_vertex_group(self, obj, v_grp: str, weight_threshold=0.2):
"""Update the vertex indicies that the gizmo shape corresponds to when using
vertex group masking.
This is very expensive, should only be called on initial Gizmo creation,
manual updates, and changing of gizmo display object or mask group.
"""
self.meshshape = MeshShape3D(obj, vertex_groups=[v_grp], weight_threshold=weight_threshold)
def refresh_shape_vgroup(self, context, eval_mesh):
"""Update the custom shape based on the stored vertex indices."""
if not self.meshshape:
self.init_shape(context)
draw_style = 'TRIS'
if len(self.meshshape._indices) < 3:
draw_style = 'LINES'
if len(self.meshshape._indices) < 2:
return
self.custom_shape = self.new_custom_shape(draw_style, self.meshshape.get_vertices(eval_mesh))
return True
def load_shape_entire_object(self, context):
"""Update the custom shape to an entire object. This is somewhat expensive,
should only be called when Gizmo display object is changed or mask
facemap/vgroup is cleared.
"""
mesh = self.get_shape_object(context).data
vertices = np.zeros((len(mesh.vertices), 3), 'f')
mesh.vertices.foreach_get("co", vertices.ravel())
if len(mesh.polygons) > 0:
draw_style = 'TRIS'
mesh.calc_loop_triangles()
tris = np.zeros((len(mesh.loop_triangles), 3), 'i')
mesh.loop_triangles.foreach_get("vertices", tris.ravel())
custom_shape_verts = vertices[tris].reshape(-1,3)
else:
draw_style = 'LINES'
edges = np.zeros((len(mesh.edges), 2), 'i')
mesh.edges.foreach_get("vertices", edges.ravel())
custom_shape_verts = vertices[edges].reshape(-1,3)
self.custom_shape = self.new_custom_shape(draw_style, custom_shape_verts)
def draw_shape(self, context, select_id=None):
"""Shared drawing logic for selection and color.
We do not pass color here; The C functions read the
colors from self.color and self.color_highlight.
"""
ob = self.get_shape_object(context)
props = self.get_props(context)
face_map = ob.face_maps.get(props.face_map_name)
if face_map and props.use_face_map:
self.draw_preset_facemap(ob, face_map.index, select_id=select_id or 0)
elif self.custom_shape:
self.draw_custom_shape(self.custom_shape, select_id=select_id)
else:
# This can happen if the specified vertex group is empty.
return
def draw_shared(self, context, select_id=None):
if not self.poll(context):
return
if not self.get_shape_object(context):
return
self.update_basis_and_offset_matrix(context)
gpu.state.line_width_set(self.line_width)
gpu.state.blend_set('MULTIPLY')
self.draw_shape(context, select_id)
gpu.state.blend_set('NONE')
gpu.state.line_width_set(1)
def get_opacity(self, context):
"""Based factors of whether the bone corresponding to this gizmo
is currently selected, and whether the gizmo is being mouse hovered,
return the opacity value that is expected to be used for drawing this gizmo.
"""
prefs = get_addon_prefs(context)
is_selected = self.get_pose_bone(context).bone.select
opacity = prefs.widget_alpha
if self.is_using_facemap(context) or self.is_using_vgroup(context):
opacity = prefs.mesh_alpha
if self.is_highlight:
opacity += prefs.delta_alpha_highlight
elif is_selected:
opacity += prefs.delta_alpha_select
return opacity
def draw(self, context):
"""Called by Blender on every viewport update (including mouse moves).
Drawing functions called at this time will draw into the color pass.
"""
if not self.poll(context):
return
if self.use_draw_hover and not self.is_highlight:
return
if self.get_opacity(context) == 0:
return
pb = self.get_pose_bone(context)
if pb.bone.select:
self.color = self.color_selected
self.alpha = min(0.999, self.alpha_selected) # An alpha value of 1.0 or greater results in glitched drawing.
else:
self.color = self.color_unselected
self.alpha = min(0.999, self.alpha_unselected)
self.draw_shared(context)
def draw_select(self, context, select_id):
"""Called by Blender on every viewport update (including mouse moves).
Drawing functions called at this time will draw into an invisible pass
that is used for mouse interaction.
"""
if not self.poll(context):
return
self.draw_shared(context, select_id)
def is_using_vgroup(self, context):
ob = self.get_shape_object(context)
if not ob: return False
props = self.get_pose_bone(context).bone_gizmo
vgroup_exists = props.vertex_group_name in ob.vertex_groups
ret = ob and not props.use_face_map and vgroup_exists
return ret
def is_using_facemap(self, context):
props = self.get_props(context)
ob = self.get_shape_object(context)
if not ob: return False
return props.use_face_map and props.face_map_name in ob.face_maps
def is_using_bone_group_colors(self, context):
pb = self.get_pose_bone(context)
props = self.get_props(context)
return pb and pb.bone_group and pb.bone_group.color_set != 'DEFAULT' and props.gizmo_color_source == 'GROUP'
def get_pose_bone(self, context):
arm_ob = context.object
if not arm_ob or arm_ob.type != 'ARMATURE':
return
ret = arm_ob.pose.bones.get(self.bone_name)
return ret
def get_shape_object(self, context):
"""Get the shape object selected by the user in the Custom Gizmo panel.
"""
pb = self.get_pose_bone(context)
if not pb: return
ob = pb.bone_gizmo.shape_object
if not ob:
ob = pb.custom_shape
return ob
def get_props(self, context):
"""Use this context-based getter rather than any direct mean of referencing
the gizmo properties, because that would result in a crash on undo.
"""
pb = self.get_pose_bone(context)
return pb.bone_gizmo
def update_basis_and_offset_matrix(self, context):
"""Set the gizmo matrices self.matrix_basis and self.matrix_offset,
to position the gizmo correctly."""
pb = self.get_pose_bone(context)
armature = context.object
if self.is_using_facemap(context) or self.is_using_vgroup(context):
# If there is a face map or vertex group specified:
# The gizmo should stick strictly to the vertex group or face map of the shape object.
self.matrix_basis = self.get_shape_object(context).matrix_world.copy()
self.matrix_offset = Matrix.Identity(4)
else:
# If there is NO face map or vertex group specified:
# The gizmo should function as a replacement for the bone's Custom Shape
# properties. That means applying the custom shape transformation offsets
# and using the custom shape transform bone, if there is one specified.
self.matrix_basis = armature.matrix_world.copy()
display_bone = pb
if pb.custom_shape_transform:
display_bone = pb.custom_shape_transform
bone_mat = display_bone.matrix.copy()
trans_mat = Matrix.Translation(pb.custom_shape_translation)
rot = Euler((pb.custom_shape_rotation_euler.x, pb.custom_shape_rotation_euler.y, pb.custom_shape_rotation_euler.z), 'XYZ')
rot_mat = rot.to_matrix().to_4x4()
display_scale = pb.custom_shape_scale_xyz.copy()
if pb.use_custom_shape_bone_size:
display_scale *= pb.bone.length
scale_mat_x = Matrix.Scale(display_scale.x, 4, (1, 0, 0))
scale_mat_y = Matrix.Scale(display_scale.y, 4, (0, 1, 0))
scale_mat_z = Matrix.Scale(display_scale.z, 4, (0, 0, 1))
scale_mat = scale_mat_x @ scale_mat_y @ scale_mat_z
final_mat = bone_mat @ trans_mat @ rot_mat @ scale_mat
self.matrix_offset = final_mat
def invoke(self, context, event):
armature = context.object
if not event.shift:
for pb in armature.pose.bones:
pb.bone.select = False
pb = self.get_pose_bone(context)
if event.shift and pb.bone.select:
pb.bone.select = False
return {'FINISHED'}
if event.shift and not pb.bone.select:
pb.bone.select = True
armature.data.bones.active = pb.bone
return {'FINISHED'}
global is_interacting
is_interacting = True
pb.bone.select = True
armature.data.bones.active = pb.bone
# Allow executing an operator on bone interaction,
# based on data stored in the armatures 'gizmo_interaction' custom property.
# This should be a dictionary structured:
# op_bl_idname : [ ( [list of bone names], {op_kwargs} ) ]
# Whenever any of the bones from one list of bone names is interacted,
# the operator with op_bl_idname is executed, with op_kwargs passed in to it.
if 'gizmo_interactions' in armature.data:
interaction_data = armature.data['gizmo_interactions'].to_dict()
for op_name, op_datas in interaction_data.items():
op_category, op_name = op_name.split(".")
op_callable = getattr(getattr(bpy.ops, op_category), op_name)
for op_data in op_datas:
bone_names, op_kwargs = op_data
if pb.name in bone_names:
op_callable(**op_kwargs)
return {'RUNNING_MODAL'}
def exit(self, context, cancel):
global is_interacting
is_interacting = False
return
def modal(self, context, event, tweak):
return {'RUNNING_MODAL'}
classes = (
MoveBoneGizmo,
)
register, unregister = bpy.utils.register_classes_factory(classes)
scripts/addons/bone_gizmos/bone_gizmo_group.py
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# SPDX-FileCopyrightText: 2025 Blender Studio Tools Authors
#
# SPDX-License-Identifier: GPL-3.0-or-later
import bpy
from bpy.types import GizmoGroup, Gizmo, PoseBone, Operator
from .utils import get_addon_prefs
### MSGBUS FUNCTIONS ###
# The Gizmo API doesn't provide the necessary callbacks to do careful partial
# updates of gizmo data based on what properties are modified.
# However, the msgbus system allows us to create our own connections between
# Blender properties and the functions that should be called when those properties
# change.
# msgbus system needs an arbitrary python object as storage, so here it is.
gizmo_msgbus = object()
def mb_ensure_gizmos_on_active_armature(gizmo_group):
"""Ensure gizmos exist for all PoseBones that need them."""
context = bpy.context
obj = context.object
for pose_bone in obj.pose.bones:
try:
if pose_bone.enable_bone_gizmo and pose_bone.name not in gizmo_group.widgets:
gizmo = gizmo_group.create_gizmo(context, pose_bone)
elif not pose_bone.bone_gizmo.shape_object:
for bone_name, gizmo in gizmo_group.widgets.items():
if bone_name == pose_bone.name:
gizmo.custom_shape = None
except ReferenceError:
# StructRNA of type BoneGizmoGroup has been removed.
# TODO: Not sure when this happens.
pass
def mb_refresh_all_gizmo_colors(gizmo_group):
"""Keep Gizmo colors in sync with addon preferences."""
context = bpy.context
try:
for bone_name, gizmo in gizmo_group.widgets.items():
gizmo.refresh_colors(context)
except ReferenceError:
# StructRNA of type BoneGizmoGroup has been removed.
# TODO: Not sure when this happens.
pass
def mb_refresh_single_gizmo(gizmo_group, bone_name):
"""Refresh Gizmo behaviour settings. This should be called when the user changes
the Gizmo settings in the Properties editor.
"""
if not gizmo_group:
return
context = bpy.context
pose_bone = context.object.pose.bones.get(bone_name)
gizmo_props = pose_bone.bone_gizmo
try:
gizmo = gizmo_group.widgets[bone_name]
except:
return
if gizmo_props.operator != 'None':
op_name = gizmo_props.operator
if op_name == 'transform.rotate' and gizmo_props.rotation_mode == 'TRACKBALL':
op_name = 'transform.trackball'
op = gizmo.target_set_operator(op_name)
if op_name == 'transform.rotate' and gizmo_props.rotation_mode in 'XYZ':
op.orient_type = 'LOCAL'
op.constraint_axis = [axis == gizmo_props.rotation_mode for axis in 'XYZ']
if op_name in ['transform.translate', 'transform.resize']:
op.constraint_axis = gizmo_props.transform_axes
gizmo.init_properties(context)
def mb_refresh_single_gizmo_shape(gizmo_group, bone_name):
"""Re-calculate a gizmo's vertex indicies. This is expensive, so it should
be called sparingly."""
context = bpy.context
print("refresh single gizmo shape")
if not context.object or context.object.type != 'ARMATURE' or context.object.mode != 'POSE':
return
try:
gizmo = gizmo_group.widgets[bone_name]
gizmo.init_shape(context)
except:
pass
class BoneGizmoGroup(GizmoGroup):
"""This single GizmoGroup manages all bone gizmos for all rigs.""" # TODO: Currently this will have issues when there are two rigs with similar bone names. Rig object names should be included when identifying widgets.
bl_idname = "OBJECT_GGT_bone_gizmo"
bl_label = "Bone Gizmos"
bl_space_type = 'VIEW_3D'
bl_region_type = 'WINDOW'
bl_options = {
'3D' # Lets Gizmos use the 'draw_select' function to draw into a selection pass.
,'PERSISTENT'
,'SHOW_MODAL_ALL' # TODO what is this
,'DEPTH_3D' # Provides occlusion but results in Z-fighting when gizmo geometry isn't offset from the source mesh.
,'SELECT' # I thought this would make Gizmo.select do something but doesn't seem that way
,'SCALE' # This makes all gizmos' scale relative to the world rather than the camera, so we don't need to set use_draw_scale on each Gizmo. (And that option does nothing because of this one)
}
@classmethod
def poll(cls, context):
return context.scene.bone_gizmos_enabled and context.object \
and context.object.type == 'ARMATURE' and context.object.mode=='POSE'
def setup(self, context):
"""Runs when this GizmoGroup is created, I think.
Executed by Blender on launch, and for some reason
also when changing bone group colors. WHAT!?"""
self.widgets = {}
mb_ensure_gizmos_on_active_armature(self)
# Hook up the addon preferences to color refresh function
# using msgbus system.
addon_prefs = get_addon_prefs(context)
global gizmo_msgbus
bpy.msgbus.subscribe_rna(
key = addon_prefs.path_resolve('preferences', False)
,owner = gizmo_msgbus
,args = (self,)
,notify = mb_refresh_all_gizmo_colors
)
# Hook up Custom Gizmo checkbox to a function that will ensure that
# a Gizmo instance actually exists for each bone that needs one.
bpy.msgbus.subscribe_rna(
key = (PoseBone, "enable_bone_gizmo")
,owner = gizmo_msgbus
,args = (self,)
,notify = mb_ensure_gizmos_on_active_armature
)
def create_gizmo(self, context, pose_bone) -> Gizmo:
"""Add a gizmo to this GizmoGroup based on user-defined properties."""
gizmo_props = pose_bone.bone_gizmo
if not pose_bone.enable_bone_gizmo:
return
gizmo = self.gizmos.new('GIZMO_GT_bone_gizmo')
gizmo.bone_name = pose_bone.name
# Hook up gizmo properties (the ones that can be customized by user)
# to the gizmo refresh functions, using msgbus system.
global gizmo_msgbus
bpy.msgbus.subscribe_rna(
key = gizmo_props
,owner = gizmo_msgbus
,args = (self, gizmo.bone_name)
,notify = mb_refresh_single_gizmo
)
for prop_name in ['shape_object', 'vertex_group_name', 'face_map_name', 'use_face_map']:
bpy.msgbus.subscribe_rna(
key = gizmo_props.path_resolve(prop_name, False)
,owner = gizmo_msgbus
,args = (self, gizmo.bone_name)
,notify = mb_refresh_single_gizmo_shape
)
self.widgets[pose_bone.name] = gizmo
mb_refresh_single_gizmo(self, pose_bone.name)
mb_refresh_single_gizmo_shape(self, pose_bone.name)
return gizmo
def refresh(self, context):
"""This is a Gizmo API function, called by Blender on what seems to be
depsgraph updates and frame changes.
Refresh all visible gizmos that use vertex group masking.
This should be done whenever a bone position changes.
This should be kept performant!
"""
dg = context.evaluated_depsgraph_get()
eval_meshes = {}
for bonename, gizmo in self.widgets.items():
pb = gizmo.get_pose_bone(context)
if not gizmo or not gizmo.is_using_vgroup(context) or not gizmo.poll(context):
continue
obj = pb.bone_gizmo.shape_object
if obj.name in eval_meshes:
eval_mesh = eval_meshes[obj.name]
else:
eval_meshes[obj.name] = eval_mesh = obj.evaluated_get(dg).to_mesh()
eval_mesh.calc_loop_triangles()
try:
gizmo.refresh_shape_vgroup(context, eval_mesh)
except ReferenceError:
# For some reason sometimes it complains that StructRNA of the Mesh has been removed. I don't get why.
pass
class BONEGIZMO_OT_RestartGizmoGroup(Operator):
"""Re-initialize all gizmos. Needed when the gizmo shape objects are modified, since there's no dependency between gizmos and their target shapes"""
bl_idname = "pose.restart_gizmos"
bl_label = "Refresh Gizmos"
bl_options = {'REGISTER', 'UNDO'}
def execute(self, context):
bpy.utils.unregister_class(BoneGizmoGroup)
bpy.utils.register_class(BoneGizmoGroup)
return {'FINISHED'}
registry = [
BoneGizmoGroup,
BONEGIZMO_OT_RestartGizmoGroup
]
def unregister():
# Unhook everything from msgbus system
global gizmo_msgbus
bpy.msgbus.clear_by_owner(gizmo_msgbus)
scripts/addons/bone_gizmos/bone_gizmo_properties.py
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# SPDX-FileCopyrightText: 2025 Blender Studio Tools Authors
#
# SPDX-License-Identifier: GPL-3.0-or-later
import bpy
from bpy.types import Object, Scene, PropertyGroup
from bpy.props import (
PointerProperty, BoolProperty,
FloatVectorProperty, StringProperty, EnumProperty,
BoolVectorProperty
)
class BoneGizmoProperties(PropertyGroup):
operator: EnumProperty(
name = "Operator"
,description = "Operator to use when click and dragging on the gizmo"
,items = [
('None', "None", "Only select the bone on click & drag, ignoring the dragging")
,('transform.translate', "Translate", "Translate the bone on click & drag")
,('transform.rotate', "Rotate", "Rotate the bone on click & drag")
,('transform.resize', "Scale", "Scale the bone on click & drag")
]
,default = 'transform.translate'
)
rotation_mode: EnumProperty(
name = "Rotation Mode"
,description = "How the bone should rotate on initial click & drag interaction"
,items = [
('VIEW', "View", "Viewing angle dependent rotation, same as pressing R or using the outer white ring of the rotation gizmo")
,('TRACKBALL', "Trackball", "Trackball-type rotation, could be useful for eyes")
,('X', "X", "Rotate along local X axis")
,('Y', "Y", "Rotate along local Y axis")
,('Z', "Z", "Rotate along local Z axis")
]
,default = 'VIEW'
)
transform_axes: BoolVectorProperty(
name = "On Axis"
,description = "Lock transformation along one or more axes on initial click & drag interaction"
,size = 3
)
shape_object: PointerProperty(
name = "Shape"
,type = Object
,description = "Object to use as shape for this gizmo"
,poll = lambda self, object: object.type == 'MESH'
)
face_map_name: StringProperty(
name = "Face Map"
,description = "Face Map to use as shape for this gizmo"
)
vertex_group_name: StringProperty(
name = "Vertex Group"
,description = "Vertex Group to use as shape for this gizmo"
)
use_face_map: BoolProperty(
name = "Mesh Mask Type"
,description = "Toggle between using Face Maps or Vertex Groups as the mesh masking data" # Currently it seems face maps are just worse vertex groups, but maybe they are faster, or maybe it's good to have them separated.
)
gizmo_color_source: EnumProperty(
name = "Color Source"
,description = "Where to take Gizmo Color information from"
,items = [
('GROUP', 'Bone Group', 'Color this Gizmo based on the bone group colors'),
('UNIQUE', 'Unique', 'Give this gizmo its own individual color')
]
)
color: FloatVectorProperty(
name = "Color"
,description = "Color of the gizmo when not mouse hovered"
,subtype = 'COLOR'
,size = 3
,min = 0.0
,max = 1.0
,default = (1.0, 0.05, 0.38)
)
color_highlight: FloatVectorProperty(
name = "Highlight Color"
,description = "Color of the gizmo when mouse hovered or selected"
,subtype = 'COLOR'
,size = 3
,min = 0.0
,max = 1.0
,default = (1.0, 0.5, 1.0)
)
# This is made redundant by the ability to set the color to fully transparent.
use_draw_hover: BoolProperty(
name = "Hover Only"
,description = "Draw the gizmo only when it is being mouse hovered"
,default = False
)
# These functionalities sadly don't work when the gizmo uses target_set_operator,
# which we absolutely need.
use_draw_modal: BoolProperty(
name = "Draw During Interact"
,description = "Draw the gizmo during interaction"
,default = True
)
use_draw_value: BoolProperty(
name = "Draw Interact Value"
,description = "Draw values in the top-left corner of the viewport during interaction"
,default = True
)
use_draw_cursor: BoolProperty(
name = "Draw Interact Mouse"
,description = "Draw the mouse cursor during interaction"
,default = True
)
classes = (
BoneGizmoProperties,
)
register_cls, unregister_cls = bpy.utils.register_classes_factory(classes)
def register():
register_cls()
# This cannot be a part of the PropertyGroup because we need it to be drivable. See T48975.
bpy.types.PoseBone.enable_bone_gizmo = BoolProperty(
name = "Enable Bone Gizmo"
,description = "Attach a custom gizmo to this bone"
,default = False
)
bpy.types.PoseBone.bone_gizmo = PointerProperty(type=BoneGizmoProperties)
Scene.bone_gizmos_enabled = BoolProperty(
name = "Bone Gizmos"
,description = "Globally toggle bone gizmos"
,default = True
)
def unregister():
unregister_cls()
del bpy.types.PoseBone.bone_gizmo
del Scene.bone_gizmos_enabled
scripts/addons/bone_gizmos/bone_gizmo_ui.py
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# SPDX-FileCopyrightText: 2025 Blender Studio Tools Authors
#
# SPDX-License-Identifier: GPL-3.0-or-later
from bpy.types import Panel, VIEW3D_PT_gizmo_display
class BONEGIZMO_PT_bone_gizmo_settings(Panel):
"""Panel to draw gizmo settings for the active bone."""
bl_label = "Custom Gizmo"
bl_idname = "BONE_PT_CustomGizmo"
bl_space_type = 'PROPERTIES'
bl_region_type = 'WINDOW'
bl_parent_id = "BONE_PT_display"
@classmethod
def poll(cls, context):
ob = context.object
pb = context.active_pose_bone
return ob.type == 'ARMATURE' and pb
def draw_header(self, context):
pb = context.active_pose_bone
layout = self.layout
layout.prop(pb, 'enable_bone_gizmo', text="")
def draw(self, context):
overlay_enabled = context.scene.bone_gizmos_enabled
pb = context.active_pose_bone
props = pb.bone_gizmo
layout = self.layout
layout.use_property_split = True
layout.use_property_decorate = False
layout = layout.column(align=True)
if not overlay_enabled:
layout.alert = True
layout.label(text="Bone Gizmos are disabled in the Viewport Gizmos settings in the 3D View header.")
return
layout.enabled = pb.enable_bone_gizmo and overlay_enabled
bg = pb.bone_group
usable_bg_col = bg and bg.color_set != 'DEFAULT'
if usable_bg_col:
layout.row().prop(props, 'gizmo_color_source', icon='GROUP_BONE', expand=True)
color_col = layout.column()
# sub_row = color_col.row(align=True)
if usable_bg_col and props.gizmo_color_source == 'GROUP':
color_col.row().prop(bg.colors, 'normal', text="Group Color")
color_col.row().prop(bg.colors, 'select', text="Group Highlight Color")
else:
color_col.row().prop(props, 'color', text="Gizmo Color")
color_col.row().prop(props, 'color_highlight', text="Gizmo Highlight Color")
layout.separator()
layout.row().prop(props, 'operator', expand=True)
if props.operator == 'transform.rotate':
layout.row().prop(props, 'rotation_mode', expand=True)
elif props.operator in ['transform.translate', 'transform.resize']:
row = layout.row(align=True, heading="Axis")
row.prop(props, 'transform_axes', index=0, toggle=True, text="X")
row.prop(props, 'transform_axes', index=1, toggle=True, text="Y")
row.prop(props, 'transform_axes', index=2, toggle=True, text="Z")
layout.separator()
layout.prop(props, 'shape_object')
if props.shape_object:
row = layout.row(align=True)
if props.use_face_map:
row.prop_search(props, 'face_map_name', props.shape_object, 'face_maps', icon='FACE_MAPS')
icon = 'FACE_MAPS'
else:
row.prop_search(props, 'vertex_group_name', props.shape_object, 'vertex_groups')
icon = 'GROUP_VERTEX'
row.prop(props, 'use_face_map', text="", emboss=False, icon=icon)
def VIEW3D_MT_bone_gizmo_global_enable(self, context):
col = self.layout.column()
col.label(text="Bone Gizmos")
col.prop(context.scene, 'bone_gizmos_enabled')
registry = [
BONEGIZMO_PT_bone_gizmo_settings,
]
def register():
VIEW3D_PT_gizmo_display.prepend(VIEW3D_MT_bone_gizmo_global_enable)
def unregister():
VIEW3D_PT_gizmo_display.remove(VIEW3D_MT_bone_gizmo_global_enable)
scripts/addons/bone_gizmos/operators.py
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# SPDX-FileCopyrightText: 2025 Blender Studio Tools Authors
#
# SPDX-License-Identifier: GPL-3.0-or-later
import bpy
from bpy.utils import flip_name
from bpy.props import BoolProperty
def copy_gizmo_properties(from_pb, to_pb):
to_pb.enable_bone_gizmo = from_pb.enable_bone_gizmo
gizmo_properties_class = bpy.types.PropertyGroup.bl_rna_get_subclass_py('BoneGizmoProperties')
for key in gizmo_properties_class.__annotations__.keys():
value = getattr(from_pb.bone_gizmo, key)
setattr(to_pb.bone_gizmo, key, value)
class POSE_OT_Symmetrize_Bone_Gizmos(bpy.types.Operator):
"""Symmetrize bone gizmo settings of selected bones"""
bl_idname = "pose.symmetrize_bone_gizmos"
bl_label = "Symmetrize Bone Gizmos"
bl_options = {'REGISTER', 'UNDO'}
@classmethod
def poll(cls, context):
return context.selected_pose_bones
def execute(self, context):
pbs = context.selected_pose_bones
skipped = 0
symmetrized = 0
for pb in pbs:
flip_pb = context.object.pose.bones.get(flip_name(pb.name))
if flip_pb in context.selected_pose_bones:
skipped += 1
continue
copy_gizmo_properties(pb, flip_pb)
flip_pb.bone_gizmo.vertex_group_name = flip_name(flip_pb.bone_gizmo.vertex_group_name)
flip_pb.bone_gizmo.face_map_name = flip_name(flip_pb.bone_gizmo.face_map_name)
symmetrized += 1
if skipped:
self.report({'INFO'}, f"Symmetrized {symmetrized} gizmos. {skipped} were skipped due to being selected on both sides.")
else:
self.report({'INFO'}, f"Symmetrized {symmetrized} gizmos.")
return {'FINISHED'}
class POSE_OT_Edit_Gizmo_Mask(bpy.types.Operator):
"""Enter edit mode to edit the mask of the active bone's gizmo"""
bl_idname = "pose.edit_gizmo_mask"
bl_label = "Edit Gizmo Mask"
bl_options = {'REGISTER', 'UNDO'}
create_new: BoolProperty(
name = "Create New Mask"
,description = "Whether to create and assign a brand new vertex group or face map when entering edit mode"
,default = False
)
@classmethod
def poll(cls, context):
pb = context.active_pose_bone
if not pb:
return
bg = pb.bone_gizmo
return bg.shape_object
def execute(self, context):
pb = context.active_pose_bone
bg = pb.bone_gizmo
shape_object = pb.bone_gizmo.shape_object
bpy.ops.object.mode_set(mode='OBJECT')
context.view_layer.objects.active = shape_object
bpy.ops.object.mode_set(mode='EDIT')
bpy.ops.mesh.reveal()
bpy.ops.mesh.select_all(action='DESELECT')
if bg.use_face_map:
if self.create_new:
fm = shape_object.face_maps.new(name="FM_"+pb.name)
bg.face_map_name = fm.name
else:
shape_object.face_maps.active_index = shape_object.face_maps.find(bg.face_map_name)
bpy.ops.object.face_map_select()
else:
if self.create_new:
fm = shape_object.vertex_groups.new(name="FM_"+pb.name)
bg.vertex_group_name = fm.name
else:
shape_object.vertex_groups.active_index = shape_object.vertex_groups.find(bg.vertex_group_name)
bpy.ops.object.vertex_group_select()
return {'FINISHED'}
class VIEW3D_MT_bone_gizmos(bpy.types.Menu):
bl_label = "Bone Gizmos"
bl_idname = "VIEW3D_MT_bone_gizmos"
def draw(self, context):
layout = self.layout
obj = context.object
layout.operator('pose.restart_gizmos', icon='FILE_REFRESH')
layout.separator()
layout.operator(POSE_OT_Symmetrize_Bone_Gizmos.bl_idname, icon='MOD_MIRROR')
layout.separator()
row = layout.row()
bg = context.active_pose_bone.bone_gizmo
row.active = bool((bg.use_face_map and bg.face_map_name) or bg.vertex_group_name)
row.operator(POSE_OT_Edit_Gizmo_Mask.bl_idname, icon='FACE_MAPS').create_new=False
layout.operator(POSE_OT_Edit_Gizmo_Mask.bl_idname, text="Create Gizmo Mask", icon='MOD_SOLIDIFY').create_new=True
def draw_gizmo_menu(self, context):
if context.active_pose_bone and context.active_pose_bone.enable_bone_gizmo:
self.layout.menu("VIEW3D_MT_bone_gizmos", text="Gizmo")
registry = [
POSE_OT_Symmetrize_Bone_Gizmos,
POSE_OT_Edit_Gizmo_Mask,
VIEW3D_MT_bone_gizmos,
]
def register():
bpy.types.VIEW3D_MT_editor_menus.append(draw_gizmo_menu)
def unregister():
bpy.types.VIEW3D_MT_editor_menus.remove(draw_gizmo_menu)
scripts/addons/bone_gizmos/shapes.py
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# SPDX-FileCopyrightText: 2025 Blender Studio Tools Authors
#
# SPDX-License-Identifier: GPL-3.0-or-later
import bpy
from math import pi, cos, sin, sqrt
from copy import deepcopy
import numpy as np
from enum import Enum
class Axis(Enum):
X = 0
Y = 1
Z = 2
class BasicShape:
vertices = []
def __init__(self, scale=1.0, offset=(0.0, 0.0)):
# make vertices unique to instance
self.vertices = deepcopy(self.vertices)
self.scale(scale)
self.offset(offset)
self.center()
def scale(self, factor):
for verts in self.vertices:
for i, co in enumerate(verts):
verts[i] = co * factor
def offset(self, offset):
for verts in self.vertices:
for i, co in enumerate(verts):
verts[i] = co + offset[i]
@property
def size(self):
# TODO
return 1.0, 1.0
def center(self):
size_x, size_y = self.size
self.offset((size_x/-2.0, size_y/-2.0))
class Tris2D(BasicShape):
vertices = [
[0.0, 0.0],
[0.0, 1.0],
[1.0, 1.0],
]
class Quad2D(BasicShape):
vertices = deepcopy(Tris2D.vertices) + [deepcopy(Tris2D.vertices[-1]),
[Tris2D.vertices[-1][0], Tris2D.vertices[0][1]],
deepcopy(Tris2D.vertices[0])]
@property
def size(self):
low_left = self.vertices[0]
up_right = self.vertices[2]
return abs(up_right[0] - low_left[0]), abs(up_right[1] - low_left[1])
def frame_vertices(self, thickness=0.25):
inner = Quad2D(scale=1 - thickness)
inner.center()
verts = []
for i in range(0, 4, 3):
verts.append(self.vertices[i])
verts.append(self.vertices[i + 1])
verts.append(inner.vertices[i])
verts.append(inner.vertices[i])
verts.append(inner.vertices[i + 1])
verts.append(self.vertices[i + 1])
verts.append(self.vertices[i + 1])
verts.append(self.vertices[i + 2])
verts.append(inner.vertices[i + 1])
verts.append(inner.vertices[i + 1])
verts.append(inner.vertices[i + 2])
verts.append(self.vertices[i + 2])
return verts
class Rect2D(BasicShape):
# Coordinates (each one is a triangle).
vertices = [
[-0.5, -1.0],
[-0.5, 1.0],
[0.5, 1.0],
[0.5, 1.0],
[0.5, -1.0],
[-0.5, -1.0],
]
class Cross2D(BasicShape):
vertices = deepcopy(Rect2D.vertices) + [
[-1.0, -0.5],
[-1.0, 0.5],
[1.0, 0.5],
[1.0, 0.5],
[1.0, -0.5],
[-1.0, -0.5],
]
class Circle2D(BasicShape):
def __init__(self, scale=1.0, offset=(0.0, 0.0), segments=24):
self.segments = segments
self.vertices = []
if any(offset):
raise NotImplementedError
full_circle = 2 * pi
arc_len = full_circle / self.segments
for i in range(self.segments):
arc = arc_len * i
self.vertices.append([cos(arc) * scale, sin(arc * scale)])
arc = arc_len * (i + 1)
self.vertices.append([cos(arc) * scale, sin(arc) * scale])
self.vertices.append([0.0, 0.0])
@property
def size(self):
vert = self.vertices[0]
diameter = sqrt(pow(vert[0], 2) + pow(vert[1], 2))
return diameter, diameter
def frame_vertices(self, thickness=0.25):
scale = 1 - thickness
verts = []
inner = None
for vert in self.vertices:
if inner:
verts.append(vert)
verts.append(inner)
verts.append(vert)
inner = [vert[0] * scale, vert[1] * scale]
verts.append(inner)
return verts
class Sphere(BasicShape):
def __init__(self, scale=1.0, offset=(0.0, 0.0, 0.0), segments=24, rings=12):
self.segments = segments
self.vertices = []
full_circle = 2 * pi
arc_len = full_circle / self.segments
circle_verts = []
for i in range(self.segments):
arc = arc_len * i
circle_verts.append([cos(arc), sin(arc), 0.0])
arc = arc_len * (i + 1)
circle_verts.append([cos(arc), sin(arc), 0.0])
circle_verts.append([0.0, 0.0, 0.0])
upper = None
# TODO: better way of drawing a sphere
prev_height = 0
next_height = 0
prev_scale = scale
for _ in range(int(rings/2)):
next_height += 2 / rings
next_scale = sqrt(1 - next_height ** 2) * scale
for circle_vert in circle_verts:
if upper:
self.vertices.append([circle_vert[0] * prev_scale, circle_vert[1] * prev_scale, prev_height * scale])
self.vertices.append(upper)
self.vertices.append([circle_vert[0] * prev_scale, circle_vert[1] * prev_scale, prev_height * scale])
upper = [circle_vert[0] * next_scale, circle_vert[1] * next_scale, next_height * scale]
self.vertices.append(upper)
prev_height = next_height
prev_scale = next_scale
prev_height = 0
next_height = 0
prev_scale = scale
for _ in range(int(rings / 2)):
next_height -= 2 / rings
next_scale = sqrt(1 - next_height ** 2) * scale
for circle_vert in circle_verts:
if upper:
self.vertices.append([circle_vert[0] * prev_scale, circle_vert[1] * prev_scale, prev_height * scale])
self.vertices.append(upper)
self.vertices.append([circle_vert[0] * prev_scale, circle_vert[1] * prev_scale, prev_height * scale])
upper = [circle_vert[0] * next_scale, circle_vert[1] * next_scale, next_height * scale]
self.vertices.append(upper)
prev_height = next_height
prev_scale = next_scale
self.offset(offset)
def offset(self, offset):
for i, vert in enumerate(self.vertices):
self.vertices[i] = deepcopy(vert)
for j, offs in enumerate(offset):
self.vertices[i][j] += offs
@property
def size(self):
vert = self.vertices[0]
diameter = sqrt(pow(vert[0], 2) + pow(vert[1], 2))
return diameter, diameter
def frame_vertices(self, thickness=0.25):
scale = 1 - thickness
verts = []
inner = None
for vert in self.vertices:
if inner:
verts.append(vert)
verts.append(inner)
verts.append(vert)
inner = [vert[0] * scale, vert[1] * scale]
verts.append(inner)
return verts
class MeshShape3D(BasicShape):
def __init__(self, mesh, fix_zfighting=True, vertex_groups=None, weight_threshold=0.2):
self._indices = []
self.fix_zfighting = fix_zfighting
self.tris_from_mesh(mesh, vertex_groups=vertex_groups, weight_threshold=weight_threshold)
def get_vertices(self, eval_mesh):
"""Return positions of the vertices of the already stored indicies."""
if not self.fix_zfighting:
return [eval_mesh.vertices[i].co for i in self._indices]
verts = [eval_mesh.vertices[i].co for i in self._indices]
verts = np.array([eval_mesh.vertices[i].co for i in self._indices], 'f')
# Unfortunately this scaling has a massive performance impact.
average = np.average(verts, axis=0)
verts -= average
verts *= 1.001
verts += average
return verts
def tris_from_mesh(self, obj, vertex_groups=[], weight_threshold=0.2):
depsgraph = bpy.context.evaluated_depsgraph_get()
eval_ob = obj.evaluated_get(depsgraph)
mesh = eval_ob.data
mesh.calc_loop_triangles()
self._indices = []
if vertex_groups:
group_idx = [obj.vertex_groups[vertex_group].index for vertex_group in vertex_groups]
for tris in mesh.loop_triangles:
if all(any(g.weight > weight_threshold for g in mesh.vertices[i].groups if g.group in group_idx) for i in tris.vertices):
self._indices.extend(tris.vertices)
else:
indices = np.empty((len(mesh.loop_triangles), 3), 'i')
mesh.loop_triangles.foreach_get(
"vertices", np.reshape(indices, len(mesh.loop_triangles) * 3))
self._indices = np.concatenate(indices)
class MeshShape2D(BasicShape):
def __init__(self, mesh, scale=1.0):
super().__init__(scale)
self.tris_from_mesh(mesh, scale=scale)
def tris_from_mesh(self, mesh, scale=100, matrix=None, view_axis=Axis.Y):
mesh.calc_loop_triangles()
vertices = np.empty((len(mesh.vertices), 3), 'f')
indices = np.empty((len(mesh.loop_triangles), 3), 'i')
mesh.vertices.foreach_get(
"co", np.reshape(vertices, len(mesh.vertices) * 3))
mesh.loop_triangles.foreach_get(
"vertices", np.reshape(indices, len(mesh.loop_triangles) * 3))
if matrix:
# we invert the matrix as we are facing the object
np_mat = np.array(matrix.normalized().inverted().to_3x3())
vertices *= matrix.to_scale()
np.copyto(vertices, vertices @ np_mat)
vertices += matrix.translation
# remove view axis
vertices = np.delete(vertices, view_axis.value, 1)
# scale
vertices *= scale
self.vertices = [vertices[i] for i in np.concatenate(indices)]
scripts/addons/bone_gizmos/utils.py
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import bpy
def get_addon_prefs(context=None):
if not context:
context = bpy.context
base_package = __package__
if base_package.startswith('bl_ext'):
# 4.2
return context.preferences.addons[base_package].preferences
else:
return context.preferences.addons[base_package.split(".")[0]].preferences