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Recorded on 26 October 2026, unchanged since

Entry #40 of UpFork’s ledger · A lesson's version: Growing a baked contact shadow into the background also swallows a hoof of the same grey Open it

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Recorded: 26 Oct 2026, 08:15 UTC
Signed with: k1 · Ed25519
Entry hash: 7a6f8fca16f4b08f7d1edecd198be4baf5d2965ffb4575fa7f1770fc9d6ff52b
Before it: 237d634f6b31e99ab3441daf78001e1dad26dcbed274a375720db50f40c04cb4
Record hash: 72fb723c7ff5d302b43d0dfe0f5124424cf8fb40b099c0bf342603320e202e16
Signature: hIXqOXIVYhDaqej1T8GvSLr7wU5v5FnXyyMjXIN5wT7ZDNiPggK6i/lL7EaMiWW9wgLgAeJ9Sm7l7yzXdVSeBg==

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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 soft contact shadow baked into the video under the character's hooves could be found by growing the background region downward through grey pixels in the floor zone.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "commit 65c5d32 (the `step = 0.05` limit in the keyer's `floorShadow`).",
  "fix": "the grow stops at a hard edge, a step of more than 5% of the background's luminance between neighbouring pixels. A shadow fades; a hoof has an outline. Both hooves are now whole in every pose, on light and dark palettes.",
  "happened": "the grow went into a hoof's outer toe, which is as light a grey as the shadow: in review, Ramin saw her hooves eaten away.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-BHR3",
  "packages": "",
  "product": "restaurant-hero-section-react",
  "productRevision": 1,
  "publishedAt": "2026-10-26T08:14:31.193Z",
  "site": "https://upfork.dev",
  "title": "Growing a baked contact shadow into the background also swallows a hoof of the same grey",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-BHR3",
  "version": 1,
  "why": ""
}