{
  "about": "An entry of UpFork's ledger. Check it by hand as https://upfork.dev/docs/ledger says, or at https://upfork.dev/verify/E-40",
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    "seq": 40,
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    "record": "{\"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\":\"\"}",
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    "recordedAt": "2026-10-26T08:15:08.816808+00:00",
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  "keys": "https://upfork.dev/ledger/keys.json"
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