Physbones

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PhysBones are components that allow avatars to display additional motion beyond the normal skeletal movements. This can be used on things like hair, clothing, tails, ears, and more, allowing those features to be affected by movement, gravity, collisions, and user interactions such as grabbing and posing.

History

PhysBones first showed up in the VRChat 2022.1.2 release. They were designed to be a more performant and free replacement for Dynamic Bones, which are a paid Unity asset. Initially Dynamic Bones were still supported and even had a user option to be auto-converted to PhysBones, but as of the VRChat 2024.3.1 release they are now always auto-converted, and Dynamic Bones are no longer permitted on new avatar uploads.

Resources

• PhysBones on the VRChat Creation Docs