{
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    "record": "{\"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\":\"\"}",
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