{
  "title": "Fine-Spangle Galvanized Sheet",
  "origin": "AI-generated with built-in image_gen; prepared by Locker3d",
  "date": "2026-10-28",
  "resolution": [
    1024,
    1024
  ],
  "license": "CC0-1.0, following the official Locker3d texture policy",
  "prompt": "Use case: photorealistic-natural. Asset type: square albedo/base-color map for a downloadable 3D metallic material. Subject: clean, fresh fine-spangle galvanized steel sheet, neutral light silver-gray zinc-coated surface. Densely distributed small irregular angular crystalline patches, about 2 to 8 mm across within an illustrative 30 cm square area; some fine branching featherlike crystal growth within the patches. Smooth continuous metal, restrained local tonal differences between adjacent crystals, subtle fine satin micrograin, clear irregular crystalline boundaries with no dark outlines. Unlike weathered zinc, no chalky oxidation clouds, blue patina, white corrosion deposits or rough encrusted patches. No hammered dimples, embossed scales, stone-like polygon cracks, large scratches, rust, dents, rivets, panel seams, folds or objects. Straight-on perpendicular orthographic material macro photography, square full bleed with even detail density, opposite edges designed to repeat, no focal motif. Neutral uniform cross-polarized diffuse lighting for intrinsic base color only: no baked glints, bright specular highlights, reflections of a room, directional lighting, shadows, AO, vignette or gradient. Realistic calibrated photographic texture, not glitter, noise, stylized camouflage or decorative foil. No typography, border, watermark, sphere, floor scene or perspective. Output at least 1024 pixels square.",
  "maps": [
    {
      "file": "textures/albedo.png",
      "colorSpace": "sRGB",
      "bytes": 2191528,
      "sha256": "f8f6b780b045ec9f36c5542104cd22fd96e89e1cca3a63687a393edf5ba71aca"
    },
    {
      "file": "textures/normal-gl.png",
      "colorSpace": "Non-Color",
      "bytes": 845969,
      "sha256": "27818527153aefc130f15498b5a9423b8aaf286cf8b914f938efaf318d1af2f2"
    },
    {
      "file": "textures/roughness.png",
      "colorSpace": "Non-Color",
      "bytes": 413054,
      "sha256": "38432742006b343dfb80970103796fd0dcabac8de874dbd9fbd989fa63043aac"
    }
  ],
  "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": 4.321,
    "topBottomMeanAbsRGB": 4.115
  },
  "suggestedTileMeters": 0.3,
  "metallicConstant": 1,
  "normalStrength": 0.3,
  "beforeEdgeDiagnostics": {
    "leftRightMeanAbsRGB": 13.027,
    "topBottomMeanAbsRGB": 12.389
  }
}