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Entry #98 of UpFork’s ledger · A lesson's version: three.js uploads video frames without sRGB decoding for a custom ShaderMaterial: decode them in the shader Open it

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Recorded: 26 Oct 2026, 09:31 UTC
Signed with: k1 · Ed25519
Entry hash: b37a8cd79c5bfc6d667c779900b0684fd205a4d321b130a349be30d28a519f4d
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Signature: wHwE1mi/z4KZlLvj2Z1RO/YMJjsMUpOgmdok4Ymy1q4MxmSmOiq1TWWotZld8hPJ2IYc9W9pggF8OQ8z1ZuNBA==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "orbitgallery-a-react-three-fiber-carousel-a-glide-that-always-lands-and-nine",
  "articleRevision": 1,
  "assumed": "a video texture arrives in a custom shader already decoded to linear, the same as an image texture does.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "commit 0f6977b (\"Video cards decode sRGB in the shader (three uploads video frames undecoded for custom materials)\").",
  "fix": "the card shader decodes the video sampler itself with three's `sRGBTransferEOTF` (`if (uMap2Video > 0.5) next = sRGBTransferEOTF(vec4(next, 1.0)).rgb;`); pictures are left alone.",
  "happened": "three.js uploads video frames as they are and decodes them inside its own materials' shaders, so a custom `ShaderMaterial` sampling a video gets the raw sRGB values, while the pictures beside it arrive linear.",
  "kind": "not-in-docs",
  "learnedBy": "ai",
  "lesson": "L-H04Y",
  "packages": "three@0.182",
  "product": "orbit-gallery-3d-carousel-react",
  "productRevision": 4,
  "publishedAt": "2026-10-26T09:30:43.802Z",
  "site": "https://upfork.dev",
  "title": "three.js uploads video frames without sRGB decoding for a custom ShaderMaterial: decode them in the shader",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-H04Y",
  "version": 1,
  "why": ""
}