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Library clips: Hips-only translations to avoid distorting the model

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Some Mixamo clips carry translation keyframes on every bone; bound to a
model with different proportions they stretch/crush the limbs (bone
lengths must come from the target skeleton). Library binding now keeps
translations only for the Hips (root motion); rotations drive the rest.
Clips baked into a model keep their full channels.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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lucianoandClaude Fable 5 committed 2026-07-31 11:34:22 +02:00
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src/model3d.js
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@@ -498,6 +498,10 @@ class ModelSim {
for (const ch of clip.channels) { for (const ch of clip.channels) {
const ni = idxByBase[ch.bone]; const ni = idxByBase[ch.bone];
if (ni === undefined) continue; if (ni === undefined) continue;
// foreign clips: translations only for the Hips — per-bone
// translations carry the SOURCE rig's proportions and would
// stretch/crush a model with different bone lengths
if (ch.path === 'translation' && ch.bone !== 'Hips') continue;
channels.push({ node: ni, path: ch.path, times: ch.times, vals: ch.vals }); channels.push({ node: ni, path: ch.path, times: ch.times, vals: ch.vals });
} }
if (channels.length > 4) if (channels.length > 4)