{
  "title": "Fan-Cut Straw Marquetry",
  "origin": "AI-generated with built-in image_gen; prepared by Locker3d",
  "date": "2026-11-07",
  "resolution": [
    1024,
    1024
  ],
  "license": "CC0-1.0, following the official Locker3d texture policy",
  "prompt": "Flat hand-inlaid straw marquetry in intersecting small sunburst fan segments, each made from many parallel hair-thin split rye straw ribbons. Pale straw, muted honey and umber with natural subtle lengthwise fiber, crisp flush joins, near-flat color, no huge centered star, no basket weave, no lifted edges or gaps. 40 cm square, six to nine offset fan segments. Photorealistic square diffuse/albedo texture asset for a PBR material library, perpendicular orthographic view of a continuous flat surface, full bleed, no object, scene, border, scale ruler, text or watermark. Neutral uniformly diffuse cross-polarized illumination, no cast shadows, AO, directional shading, vignette, strong glints or reflections. Preserve intrinsic detail at consistent scale. Edges intended to tile, avoid a single dominant mark and broad lightness gradients. 1024 square or higher. This is a visual material study.",
  "maps": [
    {
      "file": "textures/albedo.png",
      "colorSpace": "sRGB",
      "bytes": 2170707,
      "sha256": "041e2f3334d52f37482bfc244717f9c05c3b216b3987c58822e90e54be46bd55"
    },
    {
      "file": "textures/normal-gl.png",
      "colorSpace": "Non-Color",
      "bytes": 1267141,
      "sha256": "d73346a2b0c646e9806a74cdf12f61330543bd50fb18cc04ba4cb4fcfe040a4a"
    },
    {
      "file": "textures/roughness.png",
      "colorSpace": "Non-Color",
      "bytes": 435750,
      "sha256": "cce456ee47678e52aa4214ba3bd2b3166456dbd2d43f3a85864388eab0fb650b"
    }
  ],
  "method": "Albedo: periodic-plus-smooth decomposition via FFT Poisson solve to reduce edge mismatch. Normal: periodic multi-scale Gaussian bands, robust contrast normalization, material-specific cavity/joint masks and central-difference tangent-space gradients. Roughness: material preset plus local detail and joint variation. All data channels are estimates, not measured surface response.",
  "limits": "Not a photoscan. No AO, displacement or metallic maps. Generated images are not guaranteed seamless; inspect repetition at your target scale. No measured physical scale; demo scale is illustrative.",
  "edgeDiagnostics": {
    "leftRightMeanAbsRGB": 4.517,
    "topBottomMeanAbsRGB": 4.757
  },
  "suggestedTileMeters": 0.4,
  "metallicConstant": 0,
  "normalStrength": 0.5,
  "beforeEdgeDiagnostics": {
    "leftRightMeanAbsRGB": 13.234,
    "topBottomMeanAbsRGB": 14.666
  }
}