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Recorded on 26 October 2026, unchanged since

Entry #46 of UpFork’s ledger · A lesson's version: Two motions joined end to end need one spring over both, or the character stops dead at the join Open it

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Recorded: 26 Oct 2026, 08:15 UTC
Signed with: k1 · Ed25519
Entry hash: 949815638c4b6d49b8a71c388b74079bfc59947270c6a28872647dc62011484d
Before it: c7ad98f9c90ce9fb965d3d91ff511cf26785d7d930f0a71f830448bb7b0b9897
Record hash: 2b736315405480716bcf832fcfd4a3da4bb5c8bb90395acf4c18fa8056eb93d6
Signature: zdeeD/gq0NoqPdjWQCVixl5wSXx4f60rhraoK0wSkG8m6rCn7A30fP0M1C9fk8gf6v+WmkRf3rAolPuyS23MAg==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "build-a-cursor-following-mascot-hero-from-an-ai-video-maple-s-frame-engine-a",
  "articleRevision": 1,
  "assumed": "the turn (the gaze axis) and the lift into the smile were separate motions: a spring on the axis, then the lift played at a constant speed.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "commit 65c5d32 (\"Before, there were two springs, a dead stop at frame 229, and a constant-speed lift\").",
  "fix": "the axis and the lift are one track, end to end, and one spring with a top acceleration moves her along all of it. A look, a smile and the way back down all start and end gently and pass from the turn into the lift without stopping.",
  "happened": "she stopped dead at the frame where the two clips meet (229) before every smile, and the lift itself looked mechanical.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-Y6KM",
  "packages": "",
  "product": "restaurant-hero-section-react",
  "productRevision": 1,
  "publishedAt": "2026-10-26T08:14:31.193Z",
  "site": "https://upfork.dev",
  "title": "Two motions joined end to end need one spring over both, or the character stops dead at the join",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-Y6KM",
  "version": 1,
  "why": ""
}