feat: spring bones

[RocioCM]

Summary

Copy of PR: #166

This pull request introduces support for spring bone physics in the preview controllers, primarily by updating dependencies and adding a physics controller for Unity, while clarifying that Babylon does not support spring bones (yet). The changes ensure that both Babylon and Unity preview controllers have a consistent interface, and Unity can now set spring bone parameters via a new method.

Spring bone physics integration:

• Added a physicsController to the Babylon preview controller with a no-op setSpringBonesParams method, indicating that spring bones are not supported in Babylon. (src/lib/babylon/render.ts) [1] [2]
• Added a new createPhysicsController function for Unity that implements setSpringBonesParams, sending the parameters to the Unity instance via JSBridge. (src/lib/unity/physics.ts, src/lib/unity/render.ts) [1] [2] [3]

Dependency update:

• Updated the @dcl/schemas dependency in package.json to a DEV branch that includes spring bone support until merged (package.json)

Related PRs:

• Builder: feat: spring bones builder#3373
• UI2: feat: spring bones ui2#404
• Schemas: feat: spring bones schemas#416

Tasks

• When schemas PR is merged & released, install the new @dcl/schemas version.

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Project	Deployment	Actions	Updated (UTC)
wearable-preview	Ready	Preview, Comment	Apr 7, 2026 5:47pm