Humanoid Rig Requirements for IK

When importing a rigged 3D model of a humanoid into Neos, it can be automatically setup with inverse kinematics, which also allows use as a full body avatar. There are certain requirements for the rig to be recognized as humanoid/biped and setup this way:

• Model can be in A-pose or T-Pose. Others might work as well
• Orientation (forward facing) should be along the positive Z axis. Flipped Z can be detected as well, but might contain bugs.
• The bones should follow a naming convention specified below. Rigs from Mixamo already follow this convention.
• The bold bones are mandatory - must be present on the rig
• The avatar also needs to have identifiable thumb - fully rigged fingers or at least one bone chain for the thumb and one for the remainder of the hand.
• Each finger must have at least two segments.
• Names are necessary for less than five fingers. For hands with five fingers, geometric detection will be used by default.

A sample Blender rig can be found here.

Bone Naming Convention

The name of the bone needs to contain one of the listed keywords. They're case-insensitive and may be decorated with numbers (e.g. "spine01"), surrounded by special characters (e.g. "rig_spine"), side indicators (e.g. "left_hand", "LeftHand" or "hand_L") or even other words (e.g. "surgeonLUpperarm1").

• Hips/Pelvis: hips, pelvis, root
• Spine: spine, chest
• Chest: spine, chest, ribcage
• Neck: neck
• Head: head

• Shoulder: shoulder, clavicle, collar, collarbone
• Upper Arm: upperarm, arm, bicep
• Lower Arm: forearm, lowerarm, elbow
• Hand: hand, wrist, palm

• Thumb: thumb
• Index: index
• Middle: middle
• Ring: ring
• Pinky: pinky, little

• Upper Leg: leg, upleg, thigh, upperleg, hip
• Lower Leg: leg, calf, knee, shin
• Foot: foot, ankle
• Toes: toe, ball, toebase, toes