274 lines
10 KiB
Python
274 lines
10 KiB
Python
import bpy
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from mathutils import *
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from math import radians, acos
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performer_obj = bpy.data.objects["performer"]
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enduser_obj = bpy.data.objects["enduser"]
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end_arm = bpy.data.armatures["enduser_arm"]
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scene = bpy.context.scene
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#TODO: Only selected bones get retargeted.
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# Selected Bones/chains get original pos empties, if ppl want IK instead of FK
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# Some "magic" numbers - frame start and end, eulers of all orders instead of just quats keyframed
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# dictionary of mapping
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# this is currently manuall input'ed, but will
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# be created from a more comfortable UI in the future
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bonemap = { "Head": "Head",
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"Neck": "Head",
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"Spine1": "Chest",
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"Spine2": "Chest",
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"Spine3": "Chest",
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"Spine": "Torso",
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"Hips": "root",
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"LeftUpLeg": "Thigh.L",
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"LeftUpLegRoll": "Thigh.L",
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"LeftLeg": "Shin.L",
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"LeftLegRoll": "Shin.L",
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"LeftFoot": "Foot.L",
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"RightUpLeg": "Thigh.R",
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"RightUpLegRoll": "Thigh.R",
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"RightLeg": "Shin.R",
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"RightLegRoll": "Shin.R",
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"RightFoot": "Foot.R",
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"LeftShoulder": "Shoulder.L",
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"LeftArm": "HiArm.L",
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"LeftArmRoll": "HiArm.L",
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"LeftForeArm": "LoArm.L",
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"LeftForeArmRoll": "LoArm.L",
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"RightShoulder": "Shoulder.R",
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"RightArm": "HiArm.R",
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"RightArmRoll": "HiArm.R",
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"RightForeArm": "LoArm.R",
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"RightForeArmRoll": "LoArm.R" }
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root = "root"
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# creation of a reverse map
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# multiple keys get mapped to list values
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bonemapr = {}
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for key in bonemap.keys():
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if not bonemap[key] in bonemapr:
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if type(bonemap[key])==type((0,0)):
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for key_x in bonemap[key]:
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bonemapr[key_x] = [key]
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else:
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bonemapr[bonemap[key]] = [key]
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else:
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bonemapr[bonemap[key]].append(key)
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# list of empties created to keep track of "original"
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# position data
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# in final product, these locations can be stored as custom props
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# these help with constraining, etc.
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constraints = []
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#creation of intermediate armature
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# the intermediate armature has the hiearchy of the end user,
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# does not have rotation inheritence
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# and bone roll is identical to the performer
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# its purpose is to copy over the rotations
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# easily while concentrating on the hierarchy changes
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def createIntermediate():
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#creates and keyframes an empty with its location
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#the original position of the tail bone
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#useful for storing the important data in the original motion
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#i.e. using this empty to IK the chain to that pos.
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def locOfOriginal(inter_bone,perf_bone):
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if not perf_bone.name+"Org" in bpy.data.objects:
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bpy.ops.object.add()
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empty = bpy.context.active_object
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empty.name = perf_bone.name+"Org"
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empty = bpy.data.objects[perf_bone.name+"Org"]
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offset = perf_bone.vector
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if inter_bone.length == 0 or perf_bone.length == 0:
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scaling = 1
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else:
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scaling = perf_bone.length / inter_bone.length
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offset/=scaling
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empty.location = inter_bone.head + offset
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empty.keyframe_insert("location")
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#Simple 1to1 retarget of a bone
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def singleBoneRetarget(inter_bone,perf_bone):
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perf_world_rotation = perf_bone.matrix * performer_obj.matrix_world
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inter_world_base_rotation = inter_bone.bone.matrix_local * inter_obj.matrix_world
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inter_world_base_inv = Matrix(inter_world_base_rotation)
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inter_world_base_inv.invert()
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return (inter_world_base_inv.to_3x3() * perf_world_rotation.to_3x3()).to_4x4()
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#uses 1to1 and interpolation/averaging to match many to 1 retarget
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def manyPerfToSingleInterRetarget(inter_bone,performer_bones_s):
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retarget_matrices = [singleBoneRetarget(inter_bone,perf_bone) for perf_bone in performer_bones_s]
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lerp_matrix = Matrix()
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for i in range(len(retarget_matrices)-1):
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first_mat = retarget_matrices[i]
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next_mat = retarget_matrices[i+1]
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lerp_matrix = first_mat.lerp(next_mat,0.5)
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return lerp_matrix
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#determines the type of hierachy change needed and calls the
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#right function
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def retargetPerfToInter(inter_bone):
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if inter_bone.name in bonemapr.keys():
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perf_bone_name = bonemapr[inter_bone.name]
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#is it a 1 to many?
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if type(bonemap[perf_bone_name[0]])==type((0,0)):
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perf_bone = performer_bones[perf_bone_name[0]]
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if inter_bone.name == bonemap[perf_bone_name[0]][0]:
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locOfOriginal(inter_bone,perf_bone)
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else:
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# then its either a many to 1 or 1 to 1
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if len(perf_bone_name) > 1:
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performer_bones_s = [performer_bones[name] for name in perf_bone_name]
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#we need to map several performance bone to a single
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for perf_bone in performer_bones_s:
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locOfOriginal(inter_bone,perf_bone)
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inter_bone.matrix_basis = manyPerfToSingleInterRetarget(inter_bone,performer_bones_s)
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else:
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perf_bone = performer_bones[perf_bone_name[0]]
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locOfOriginal(inter_bone,perf_bone)
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inter_bone.matrix_basis = singleBoneRetarget(inter_bone,perf_bone)
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inter_bone.keyframe_insert("rotation_quaternion")
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for child in inter_bone.children:
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retargetPerfToInter(child)
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#creates the intermediate armature object
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bpy.ops.object.select_name(name="enduser",extend=False)
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bpy.ops.object.duplicate(linked=False)
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bpy.context.active_object.name = "intermediate"
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inter_obj = bpy.context.active_object
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bpy.ops.object.mode_set(mode='EDIT')
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#resets roll
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bpy.ops.armature.calculate_roll(type='Z')
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bpy.ops.object.mode_set(mode="OBJECT")
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inter_arm = bpy.data.armatures["enduser_arm.001"]
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inter_arm.name = "inter_arm"
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performer_bones = performer_obj.pose.bones
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inter_bones = inter_obj.pose.bones
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#clears inheritance
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for inter_bone in inter_bones:
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inter_bone.bone.use_inherit_rotation = False
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for t in range(1,150):
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scene.frame_set(t)
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inter_bone = inter_bones[root]
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retargetPerfToInter(inter_bone)
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return inter_obj,inter_arm
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# this procedure copies the rotations over from the intermediate
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# armature to the end user one.
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# As the hierarchies are 1 to 1, this is a simple matter of
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# copying the rotation, while keeping in mind bone roll, parenting, etc.
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# TODO: Control Bones: If a certain bone is constrained in a way
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# that its rotation is determined by another (a control bone)
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# We should determine the right pos of the control bone.
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# Scale: ? Should work but needs testing.
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def retargetEnduser():
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inter_bones = inter_obj.pose.bones
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end_bones = enduser_obj.pose.bones
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def bakeTransform(end_bone):
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src_bone = inter_bones[end_bone.name]
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trg_bone = end_bone
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bake_matrix = src_bone.matrix
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rest_matrix = trg_bone.bone.matrix_local
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if trg_bone.parent and trg_bone.bone.use_inherit_rotation:
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parent_mat = src_bone.parent.matrix
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parent_rest = trg_bone.parent.bone.matrix_local
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parent_rest_inv = parent_rest.copy()
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parent_rest_inv.invert()
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parent_mat_inv = parent_mat.copy()
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parent_mat_inv.invert()
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bake_matrix = parent_mat_inv * bake_matrix
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rest_matrix = parent_rest_inv * rest_matrix
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rest_matrix_inv = rest_matrix.copy()
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rest_matrix_inv.invert()
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bake_matrix = rest_matrix_inv * bake_matrix
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trg_bone.matrix_basis = bake_matrix
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end_bone.keyframe_insert("rotation_quaternion")
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for bone in end_bone.children:
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bakeTransform(bone)
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for t in range(1,150):
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scene.frame_set(t)
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end_bone = end_bones[root]
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bakeTransform(end_bone)
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#recieves the performer feet bones as a variable
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# by "feet" I mean those bones that have plants
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# (they don't move, despite root moving) somewhere in the animation.
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def copyTranslation(perfFeet):
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endFeet = [bonemap[perfBone] for perfBone in perfFeet]
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perfRoot = bonemapr[root][0]
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locDictKeys = perfFeet+endFeet+[perfRoot]
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perf_bones = performer_obj.pose.bones
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end_bones = enduser_obj.pose.bones
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def tailLoc(bone):
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return bone.center+(bone.vector/2)
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#Step 1 - we create a dict that contains these keys:
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#(Performer) Hips, Feet
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#(End user) Feet
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# where the values are their world position on each (1,120) frame
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locDict = {}
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for key in locDictKeys:
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locDict[key] = []
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for t in range(scene.frame_start,scene.frame_end):
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scene.frame_set(t)
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for bone in perfFeet:
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locDict[bone].append(tailLoc(perf_bones[bone]))
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locDict[perfRoot].append(tailLoc(perf_bones[perfRoot]))
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for bone in endFeet:
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locDict[bone].append(tailLoc(end_bones[bone]))
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# now we take our locDict and analyze it.
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# we need to derive all chains
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locDeriv = {}
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for key in locDictKeys:
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locDeriv[key] = []
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for key in locDict.keys():
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graph = locDict[key]
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for t in range(len(graph)-1):
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x = graph[t]
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xh = graph[t+1]
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locDeriv[key].append(xh-x)
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# now find the plant frames, where perfFeet don't move much
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linearAvg = []
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for key in perfFeet:
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for i in range(len(locDeriv[key])-1):
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v = locDeriv[key][i]
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hipV = locDeriv[perfRoot][i]
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endV = locDeriv[bonemap[key]][i]
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if (v.length<0.1):
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#this is a plant frame.
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#lets see what the original hip delta is, and the corresponding
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#end bone's delta
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if endV.length!=0:
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linearAvg.append(hipV.length/endV.length)
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if linearAvg:
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avg = sum(linearAvg)/len(linearAvg)
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print("retargeted root motion should be "+ str(1/avg)+ " of original")
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inter_obj, inter_arm = createIntermediate()
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retargetEnduser()
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copyTranslation(["RightFoot","LeftFoot"]) |