BipedPlus

Ep.15 — Skin Bones Node Reference (`Skin_*`)

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This document shares the naming guidelines for Skin_* bones generated by BipedPlus as default values.
It reflects the naming conventions OtakuSolutions follows for 3dsMax rigging.

If your team does not have internal rigging naming guidelines, feel free to use this document as a reference.
When customizing the rig, maintaining these node names and structural conventions ensures full compatibility.

BipedPlus uses a dual-bone structure for certain joints, separating the main bone from segment bones (_Seg).
This design enables joint stretching and prevents scale errors.
Pattern Skin_*
Left + Center nodes 85
Right nodes (mirror) 63
Total nodes 148

Skinning Structure Design

Role Description
Main bone (is_skinned=X) Primary axis/rotation for joint motion. No skinning needed.
_Seg bone (is_skinned=O) Child of main bone; handles per-segment mesh deformation.
_Twist bone (is_skinned=O) Distributes twist rotation along the limb.
_Cor bone (is_skinned=O) Corrective bone for bilateral symmetry correction.
Bones with no Seg/Twist (is_skinned=O) Skinned directly to main bone (e.g., Finger, Hand, Foot).
Nub bone (is_skinned=X) Chain endpoint marker. No skinning needed.

Field Descriptions

Field Description
direction left / center
is_skinned Whether the bone receives skin weights (O = yes, X = no)
parent Parent node ({LAST} = last-numbered bone in the chain)
part Rig module part ID

Node List (85 — Left + Center)

node part direction parent is_skinned
Skin_Com spine center Root O
Skin_Pelvis spine center Root X
Skin_Spine spine center Skin_Pelvis X
Skin_Spine1 spine center Skin_Spine X
Skin_Spine2 spine center Skin_Spine1 X
Skin_Spine3 spine center Skin_Spine2 X
Skin_Spine4 spine center Skin_Spine3 X
Skin_Pelvis_Seg spine center Skin_Pelvis O
Skin_Spine1_Seg spine center Skin_Spine1 O
Skin_Spine2_Seg spine center Skin_Spine2 O
Skin_Spine3_Seg spine center Skin_Spine3 O
Skin_Spine4_Seg spine center Skin_Spine4 O
Skin_Spine_Seg spine center Skin_Spine O
Skin_Head neck-head center Skin_Neck X
Skin_Neck neck-head center Skin_Spine{LAST} X
Skin_HeadNub neck-head center Skin_Head X
Skin_Head_Seg neck-head center Skin_Head O
Skin_Neck_Seg neck-head center Skin_Neck O
Skin_Neck_Twist neck-head center Skin_Neck O
Skin_L_Clavicle arm left Skin_Spine{LAST} O
Skin_L_ForeArm arm left Skin_L_UpperArm X
Skin_L_Hand arm left Skin_L_ForeArm O
Skin_L_UpperArm arm left Skin_L_Clavicle X
Skin_L_ForeArm_Seg1 arm left Skin_L_ForeArm O
Skin_L_ForeArm_Seg2 arm left Skin_L_ForeArm O
Skin_L_ForeArm_Seg3 arm left Skin_L_ForeArm O
Skin_L_ForeArm_Seg4 arm left Skin_L_ForeArm O
Skin_L_ForeArm_Seg5 arm left Skin_L_ForeArm O
Skin_L_UpperArm_Seg1 arm left Skin_L_UpperArm O
Skin_L_UpperArm_Seg2 arm left Skin_L_UpperArm O
Skin_L_UpperArm_Seg3 arm left Skin_L_UpperArm O
Skin_L_UpperArm_Seg4 arm left Skin_L_UpperArm O
Skin_L_UpperArm_Seg5 arm left Skin_L_UpperArm O
Skin_L_Finger0 finger0 left Skin_L_Hand O
Skin_L_Finger01 finger0 left Skin_L_Finger0 O
Skin_L_Finger02 finger0 left Skin_L_Finger01 O
Skin_L_Finger1 finger1 left Skin_L_Hand O
Skin_L_Finger11 finger1 left Skin_L_Finger1 O
Skin_L_Finger12 finger1 left Skin_L_Finger11 O
Skin_L_Finger2 finger2 left Skin_L_Hand O
Skin_L_Finger21 finger2 left Skin_L_Finger2 O
Skin_L_Finger22 finger2 left Skin_L_Finger21 O
Skin_L_Finger3 finger3 left Skin_L_Hand O
Skin_L_Finger31 finger3 left Skin_L_Finger3 O
Skin_L_Finger32 finger3 left Skin_L_Finger31 O
Skin_L_Finger4 finger4 left Skin_L_Hand O
Skin_L_Finger41 finger4 left Skin_L_Finger4 O
Skin_L_Finger42 finger4 left Skin_L_Finger41 O
Skin_L_Calf leg left Skin_L_Thigh X
Skin_L_Foot leg left Skin_L_Calf O
Skin_L_HorseLink leg left Skin_L_Calf X
Skin_L_Thigh leg left Skin_Pelvis X
Skin_L_Toe0 leg left Skin_L_Foot O
Skin_L_Calf_Seg1 leg left Skin_L_Calf O
Skin_L_Calf_Seg2 leg left Skin_L_Calf O
Skin_L_Calf_Seg3 leg left Skin_L_Calf O
Skin_L_Calf_Seg4 leg left Skin_L_Calf O
Skin_L_Calf_Seg5 leg left Skin_L_Calf O
Skin_L_HorseLink_Seg1 leg left Skin_L_HorseLink O
Skin_L_HorseLink_Seg2 leg left Skin_L_HorseLink O
Skin_L_HorseLink_Seg3 leg left Skin_L_HorseLink O
Skin_L_HorseLink_Seg4 leg left Skin_L_HorseLink O
Skin_L_HorseLink_Seg5 leg left Skin_L_HorseLink O
Skin_L_Thigh_Seg1 leg left Skin_L_Thigh O
Skin_L_Thigh_Seg2 leg left Skin_L_Thigh O
Skin_L_Thigh_Seg3 leg left Skin_L_Thigh O
Skin_L_Thigh_Seg4 leg left Skin_L_Thigh O
Skin_L_Thigh_Seg5 leg left Skin_L_Thigh O
Skin_Prop1 prop1 center Root O
Skin_Prop2 prop2 center Root O
Skin_Prop3 prop3 center Root O
Skin_L_BackA_Skirt1 extra_skirt left Skin_Pelvis O
Skin_L_BackA_Skirt2 extra_skirt left Skin_L_BackA_Skirt1 O
Skin_L_BackA_Skirt3 extra_skirt left Skin_L_BackA_Skirt2 O
Skin_L_FrontA_Skirt1 extra_skirt left Skin_Pelvis O
Skin_L_FrontA_Skirt2 extra_skirt left Skin_L_FrontA_Skirt1 O
Skin_L_FrontA_Skirt3 extra_skirt left Skin_L_FrontA_Skirt2 O
Skin_L_Side_Skirt1 extra_skirt left Skin_Pelvis O
Skin_L_Side_Skirt2 extra_skirt left Skin_L_Side_Skirt1 O
Skin_L_Side_Skirt3 extra_skirt left Skin_L_Side_Skirt2 O
Skin_L_Back_Hip extra_hip left Skin_Pelvis O
Skin_L_Front_Hip extra_hip left Skin_Pelvis O
Skin_L_Side_Hip extra_hip left Skin_Pelvis O
Skin_L_ForeArm_Cor extra_forearm left Skin_L_UpperArm O
Skin_L_Calf_Cor extra_calf left Skin_L_Thigh O

Right Side — Replace _L_ with _R_ to get the mirrored node.
e.g. Skin_L_UpperArm → Skin_R_UpperArm

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