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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 compliant>
import bpy
import math
from mathutils import Matrix
from .errors import MetarigError
from .collections import ensure_widget_collection
WGT_PREFIX = "WGT-" # Prefix for widget objects
#=============================================
# Widget creation
#=============================================
def obj_to_bone(obj, rig, bone_name, bone_transform_name=None):
""" Places an object at the location/rotation/scale of the given bone.
"""
if bpy.context.mode == 'EDIT_ARMATURE':
raise MetarigError("obj_to_bone(): does not work while in edit mode")
bone = rig.pose.bones[bone_name]
scale = bone.custom_shape_scale
if bone.use_custom_shape_bone_size:
scale *= bone.length
if bone_transform_name is not None:
bone = rig.pose.bones[bone_transform_name]
elif bone.custom_shape_transform:
bone = bone.custom_shape_transform
obj.rotation_mode = 'XYZ'
obj.matrix_basis = rig.matrix_world @ bone.bone.matrix_local @ Matrix.Scale(scale, 4)
def create_widget(rig, bone_name, bone_transform_name=None, *, widget_name=None, widget_force_new=False):
""" Creates an empty widget object for a bone, and returns the object.
"""
assert rig.mode != 'EDIT'
bone = rig.pose.bones[bone_name]
# The bone already has a widget
if bone.custom_shape:
return None
obj_name = widget_name or WGT_PREFIX + rig.name + '_' + bone_name
scene = bpy.context.scene
collection = ensure_widget_collection(bpy.context, 'WGTS_' + rig.name)
# Check if it already exists in the scene
if not widget_force_new:
if obj_name in scene.objects:
# Move object to bone position, in case it changed
obj = scene.objects[obj_name]
obj_to_bone(obj, rig, bone_name, bone_transform_name)
return None
# Delete object if it exists in blend data but not scene data.
# This is necessary so we can then create the object without
# name conflicts.
if obj_name in bpy.data.objects:
bpy.data.objects.remove(bpy.data.objects[obj_name])
# Create mesh object
mesh = bpy.data.meshes.new(obj_name)
obj = bpy.data.objects.new(obj_name, mesh)
collection.objects.link(obj)
# Move object to bone position and set layers
obj_to_bone(obj, rig, bone_name, bone_transform_name)
return obj
def create_circle_polygon(number_verts, axis, radius=1.0, head_tail=0.0):
""" Creates a basic circle around of an axis selected.
number_verts: number of vertices of the polygon
axis: axis normal to the circle
radius: the radius of the circle
head_tail: where along the length of the bone the circle is (0.0=head, 1.0=tail)
"""
verts = []
edges = []
angle = 2 * math.pi / number_verts
i = 0
assert(axis in 'XYZ')
while i < (number_verts):
a = math.cos(i * angle)
b = math.sin(i * angle)
if axis == 'X':
verts.append((head_tail, a * radius, b * radius))
elif axis == 'Y':
verts.append((a * radius, head_tail, b * radius))
elif axis == 'Z':
verts.append((a * radius, b * radius, head_tail))
if i < (number_verts - 1):
edges.append((i , i + 1))
i += 1
edges.append((0, number_verts - 1))
return verts, edges
def adjust_widget_axis(obj, axis='y', offset=0.0):
mesh = obj.data
if axis[0] == '-':
s = -1.0
axis = axis[1]
else:
s = 1.0
trans_matrix = Matrix.Translation((0.0, offset, 0.0))
rot_matrix = Matrix.Diagonal((1.0, s, 1.0, 1.0))
if axis == "x":
rot_matrix = Matrix.Rotation(-s*math.pi/2, 4, 'Z')
trans_matrix = Matrix.Translation((offset, 0.0, 0.0))
elif axis == "z":
rot_matrix = Matrix.Rotation(s*math.pi/2, 4, 'X')
trans_matrix = Matrix.Translation((0.0, 0.0, offset))
matrix = trans_matrix @ rot_matrix
for vert in mesh.vertices:
vert.co = matrix @ vert.co
def adjust_widget_transform_mesh(obj, matrix, local=None):
"""Adjust the generated widget by applying a correction matrix to the mesh.
If local is false, the matrix is in world space.
If local is True, it's in the local space of the widget.
If local is a bone, it's in the local space of the bone.
"""
if obj:
if local is not True:
if local:
assert isinstance(local, bpy.types.PoseBone)
bonemat = local.id_data.matrix_world @ local.bone.matrix_local
matrix = bonemat @ matrix @ bonemat.inverted()
obmat = obj.matrix_basis
matrix = obmat.inverted() @ matrix @ obmat
obj.data.transform(matrix)
def write_widget(obj):
""" Write a mesh object as a python script for widget use.
"""
script = ""
script += "def create_thing_widget(rig, bone_name, size=1.0, bone_transform_name=None):\n"
script += " obj = create_widget(rig, bone_name, bone_transform_name)\n"
script += " if obj is not None:\n"
# Vertices
script += " verts = ["
for i, v in enumerate(obj.data.vertices):
script += "({:g}*size, {:g}*size, {:g}*size),".format(v.co[0], v.co[1], v.co[2])
script += "\n " if i % 2 == 1 else " "
script += "]\n"
# Edges
script += " edges = ["
for i, e in enumerate(obj.data.edges):
script += "(" + str(e.vertices[0]) + ", " + str(e.vertices[1]) + "),"
script += "\n " if i % 10 == 9 else " "
script += "]\n"
# Faces
script += " faces = ["
for i, f in enumerate(obj.data.polygons):
script += "("
for v in f.vertices:
script += str(v) + ", "
script += "),"
script += "\n " if i % 10 == 9 else " "
script += "]\n"
# Build mesh
script += "\n mesh = obj.data\n"
script += " mesh.from_pydata(verts, edges, faces)\n"
script += " mesh.update()\n"
script += " return obj\n"
script += " else:\n"
script += " return None\n"
return script
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