Play animation clips in the 3D viewer - #242
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Rigged models (from the rigging extensions, or any GLB with clips) render frozen in bind pose today: the viewer loads the glTF but never creates an AnimationMixer, so the clips it just parsed never run. That reads as a failed rig rather than a missing feature. Create a mixer for models that carry clips, tick it from useFrame, and dispose it with the model. When a file carries more than one clip, offer a small picker so each motion can be reviewed without leaving the app. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This was referenced Jul 28, 2026
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What
The viewer creates an
AnimationMixerfor models that carry animation clips, ticks it fromuseFrame, and disposes it with the model. When a file has more than one clip, a small picker lets you switch between them.Why
useGLTFalready parsesgltf.animations, but nothing ever plays them — a rigged model renders frozen in its bind pose. From the outside that looks like the rig failed, which is a confusing first experience of any rigging extension (UniRig, SkinTokens, or a hand-made rig). Three lines of state and a mixer make the model move.Tested on Linux with GLB files carrying one clip and three clips (skinned mesh, 8-bone chain): single clips autoplay, multi-clip files default to the first and switch cleanly via the picker, and unloading a model stops and uncaches the mixer.
Notes
AnimationMixercomes from thethreealready imported, andHtmlfrom the@react-three/dreialready in use.🤖 Generated with Claude Code