blender/release/scripts/bpymodules/BPyArmature.py

# 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

import Blender
import bpy
def getBakedPoseData(ob_arm, start_frame, end_frame):
	'''
	If you are currently getting IPO's this function can be used to
	return a list of frame aligned bone dictionary's
	
	The data in these can be swaped in for the IPO loc and quat
	
	If you want to bake an action, this is not as hard and the ipo hack can be removed.
	'''
	
	# --------------------------------- Dummy Action! Only for this functon
	backup_action = ob_arm.action
	backup_frame = Blender.Get('curframe')
	
	DUMMY_ACTION_NAME = '~DONT_USE~'
	# Get the dummy action if it has no users
	try:
		new_action = bpy.data.actions[DUMMY_ACTION_NAME]
		if new_action.users:
			new_action = None
	except:
		new_action = None
	
	if not new_action:
		new_action = bpy.data.actions.new(DUMMY_ACTION_NAME)
		new_action.fakeUser = False
	# ---------------------------------- Done
	
	Matrix = Blender.Mathutils.Matrix
	Quaternion = Blender.Mathutils.Quaternion
	Vector = Blender.Mathutils.Vector
	POSE_XFORM= [Blender.Object.Pose.LOC, Blender.Object.Pose.ROT]
	
	# Each dict a frame
	bake_data = [{} for i in xrange(1+end_frame-start_frame)]
	
	pose=			ob_arm.getPose()
	armature_data=	ob_arm.getData();
	pose_bones=		pose.bones
	
	# --------------------------------- Build a list of arma data for reuse
	armature_bone_data = []
	bones_index = {}
	for bone_name, rest_bone in armature_data.bones.items():
		pose_bone = pose_bones[bone_name]
		rest_matrix = rest_bone.matrix['ARMATURESPACE']
		rest_matrix_inv = rest_matrix.copy().invert()
		armature_bone_data.append( [len(bones_index), -1, bone_name, rest_bone, rest_matrix, rest_matrix_inv, pose_bone, None ])
		bones_index[bone_name] = len(bones_index)
	
	# Set the parent ID's
	for bone_name, pose_bone in pose_bones.items():
		parent = pose_bone.parent
		if parent:
			bone_index= bones_index[bone_name]
			parent_index= bones_index[parent.name]
			armature_bone_data[ bone_index ][1]= parent_index
	# ---------------------------------- Done
	
	
	
	# --------------------------------- Main loop to collect IPO data
	frame_index = 0
	for current_frame in xrange(start_frame, end_frame+1):
		ob_arm.action = backup_action
		#pose.update() # not needed
		Blender.Set('curframe', current_frame)
		#Blender.Window.RedrawAll()
		#frame_data = bake_data[frame_index]
		ob_arm.action = new_action
		###for i,pose_bone in enumerate(pose_bones):
		
		for index, parent_index, bone_name, rest_bone, rest_matrix, rest_matrix_inv, pose_bone, ipo in armature_bone_data:
			matrix= pose_bone.poseMatrix
			
			parent_bone= rest_bone.parent
			
			if parent_index != -1:
				parent_pose_matrix =		armature_bone_data[parent_index][6].poseMatrix
				parent_bone_matrix_inv =	armature_bone_data[parent_index][5]
				matrix=						matrix * parent_pose_matrix.copy().invert()
				rest_matrix=				rest_matrix * parent_bone_matrix_inv
			
			matrix=matrix * rest_matrix.copy().invert()
			
			pose_bone.quat=	matrix.toQuat()
			pose_bone.loc=	matrix.translationPart()
			pose_bone.insertKey(ob_arm, 1, POSE_XFORM) # always frame 1
			
			# THIS IS A BAD HACK! IT SUCKS BIGTIME BUT THE RESULT ARE NICE
			# - use a temp action and bake into that, always at the same frame
			#   so as not to make big IPO's, then collect the result from the IPOs
			
			# Now get the data from the IPOs
			if not ipo:	ipo = armature_bone_data[index][7] = new_action.getChannelIpo(bone_name)
			
			loc = Vector()
			quat  = Quaternion()
			
			for curve in ipo:
				val = curve.evaluate(1)
				curve_name= curve.name
				if   curve_name == 'LocX':  loc[0] = val
				elif curve_name == 'LocY':  loc[1] = val
				elif curve_name == 'LocZ':  loc[2] = val
				elif curve_name == 'QuatW': quat[3]  = val
				elif curve_name == 'QuatX': quat[0]  = val
				elif curve_name == 'QuatY': quat[1]  = val
				elif curve_name == 'QuatZ': quat[2]  = val
			
			bake_data[frame_index][bone_name] = loc, quat
			
		
		frame_index+=1
	
	ob_arm.action = backup_action
	Blender.Set('curframe', backup_frame)
	return bake_data