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Entry #704 of UpFork’s ledger · A lesson's version: Fading a neighbouring 3D object means every part of it, and right after the focused one Open it

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Recorded
5 Nov 2026, 22:02 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
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k1 · Ed25519
Entry hash
32475137f0e9ddf04d764f7099953be8644e5ebbc9034f458e46edca1d2552b9
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e22ec29d0d9843b48e504c5f0f22d3a8ac3fddd7be72bf841b1a3e2003c52893
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652184bd7fe14d0b417849e81d55f6fd775fd12be465014a66b09dfd89045f84
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UK14yDzWkDS3R11h2W6S50R796aU8pgO1vjZ6QyAcDShdGEgKz4jT9TQ22OKNa8lz69Nbwj83x1Wcv+vKXUuAg==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: any 3D scene that clears part of the screen for an overlay",
  "article": "a-3d-shoe-showroom-in-raw-webgl2-line-lights-clear-acrylic-soft-shadows-and",
  "articleRevision": 1,
  "assumed": "fading the neighbour's picture would be enough.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "with the words hidden, photograph the panel's side of the room for every shoe in focus, at every size where the panel sits beside the shoe: no hard shape inside the panel, and its luminance range stays small.",
  "evidence": "commit 9064927; the panel check in commit badceaf.",
  "fix": "every part, one ramp, starting just past the focused shoe's own slab. A neighbour is either clearly there or clearly gone.",
  "format": 2,
  "happened": "its reflection stayed on the slab as a pale smear, its shadow stayed on the wall as a dark mass, and its slab and brackets stayed as hard lines. Then, faded over a wide band, a half-faded toe read as a pale thumbprint.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-3VRH",
  "packages": "",
  "product": "3d-shoe-showroom-webgl-react",
  "productRevision": 1,
  "publishedAt": "2026-11-05T22:01:48.965Z",
  "rule": "If a 3D object must leave a zone of the screen, fade every part drawn for it (picture, shadow, reflection, slab, brackets) with one ramp that starts right after the object that stays.",
  "site": "https://upfork.dev",
  "snippet": "```glsl\nuniform vec2 uPanelFade;    // screen shares where the fade starts and where it is complete\nuniform float uPanelAmount; // 0..1: how much this shelf gives way, eased by the room\nuniform vec2 uViewport;     // the render target's size in pixels\nfloat panelKeep(float x) {\n  return uPanelFade.x < uPanelFade.y ? 1.0 - smoothstep(uPanelFade.x, uPanelFade.y, x)\n                                     : smoothstep(uPanelFade.y, uPanelFade.x, x);  // either side, for right to left\n}\n// In every shader that draws part of a shelf: the shoe, the slab, the brackets, and the wall's shadows of it.\nfloat keep = mix(1.0, panelKeep(gl_FragCoord.x / uViewport.x), uPanelAmount);\noutColor *= keep;   // premultiplied output, so scaling all four channels fades it\n```",
  "title": "Fading a neighbouring 3D object means every part of it, and right after the focused one",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-3VRH",
  "version": 1,
  "why": ""
}