Physics
VRChat PhysBones, VRM spring bones
VRM
VRM avatars, including everything VRoid Studio exports, carry their physics as spring bones and
Constraints
All six VRChat constraint types
Avatar descriptor
The VRChat avatar descriptor
Menu toggles
Basis has no expression menu, and no FX layer. What it has is
Authored motion
A Basis avatar has no animator layers, so animation that plays on its own is rebuilt as
Modular Avatar
Modular Avatar applies its components at Basis build time
Rig check
Alongside the conversion, the humanoid rig is checked against what Basis's full-body IK expects.
VRCFury
VRCFury applies its components only when VRChat builds an avatar. On Basis