Differential D4364 Diff 13757 rigify/utils/widgets.py

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rigify/utils/widgets.py

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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 .errors import MetarigError

				WGT_PREFIX = "WGT-" # Prefix for widget objects

				#=============================================
				# Widget creation
				#=============================================


				def obj_to_bone(obj, rig, bone_name):
				""" 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.data.bones[bone_name]

				mat = rig.matrix_world @ bone.matrix_local

				obj.location = mat.to_translation()

				obj.rotation_mode = 'XYZ'
				obj.rotation_euler = mat.to_euler()

				scl = mat.to_scale()
				scl_avg = (scl[0] + scl[1] + scl[2]) / 3
				obj.scale = (bone.length * scl_avg), (bone.length * scl_avg), (bone.length * scl_avg)


				def create_widget(rig, bone_name, bone_transform_name=None):
				""" Creates an empty widget object for a bone, and returns the object.
				"""
				if bone_transform_name is None:
				bone_transform_name = bone_name

				obj_name = WGT_PREFIX + rig.name + '_' + bone_name
				scene = bpy.context.scene
				collection = bpy.context.collection

				# Check if it already exists in the scene
				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_transform_name)

				return None
				else:
				# 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[obj_name].user_clear()
				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_transform_name)
				wgts_group_name = 'WGTS_' + rig.name
				if wgts_group_name in bpy.data.objects.keys():
				obj.parent = bpy.data.objects[wgts_group_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 poligon
				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 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 != None:\n"

				# Vertices
				if len(obj.data.vertices) > 0:
				script += " verts = ["
				for v in obj.data.vertices:
				script += "(" + str(v.co[0]) + "size, " + str(v.co[1]) + "size, " + str(v.co[2]) + "*size), "
				script += "]\n"

				# Edges
				if len(obj.data.edges) > 0:
				script += " edges = ["
				for e in obj.data.edges:
				script += "(" + str(e.vertices[0]) + ", " + str(e.vertices[1]) + "), "
				script += "]\n"

				# Faces
				if len(obj.data.polygons) > 0:
				script += " faces = ["
				for f in obj.data.polygons:
				script += "("
				for v in f.vertices:
				script += str(v) + ", "
				script += "), "
				script += "]\n"

				# Build mesh
				script += "\n mesh = obj.data\n"
				script += " mesh.from_pydata(verts, edges, faces)\n"
				script += " mesh.update()\n"
				script += " mesh.update()\n"
				script += " return obj\n"
				script += " else:\n"
				script += " return None\n"

				return script