{
  "format": "NSO1: LE mesh count, point count; field/vertex count; float32 positions; int16 normals; interleaved float32 XYZ + uint8 field points",
  "source": "Noosphere / data/tiles/backdrop.bin",
  "sourceSHA256": "366e0f13de4c369839a5e34c38e260e17b356cfaf78542207d13fc868acac99b",
  "sourcePublicData": "OpenAlex scholarly metadata and the existing Noosphere 2D similarity layout",
  "sourcePoints": 599743,
  "displayedPoints": 18000,
  "sampling": "18000 evenly spaced source row indices; publication year <= 2026; no coordinate jitter",
  "surfaces": [
    {
      "field": 0,
      "name": "Medicine",
      "triangles": 2828,
      "sourceSamples": 72408
    },
    {
      "field": 1,
      "name": "Engineering",
      "triangles": 3212,
      "sourceSamples": 63254
    },
    {
      "field": 2,
      "name": "Social Sciences",
      "triangles": 3132,
      "sourceSamples": 47833
    },
    {
      "field": 3,
      "name": "Computer Science",
      "triangles": 2476,
      "sourceSamples": 36467
    },
    {
      "field": 4,
      "name": "Agricultural and Biological Sciences",
      "triangles": 2520,
      "sourceSamples": 31170
    },
    {
      "field": 5,
      "name": "Biochemistry, Genetics and Molecular Biology",
      "triangles": 2456,
      "sourceSamples": 30053
    },
    {
      "field": 6,
      "name": "Physics and Astronomy",
      "triangles": 2532,
      "sourceSamples": 26566
    },
    {
      "field": 7,
      "name": "Environmental Science",
      "triangles": 2364,
      "sourceSamples": 23840
    }
  ],
  "density": {
    "resolution": 44,
    "threshold": 2.8,
    "thresholdUnits": "smoothed sample count per voxel",
    "smoothing": {
      "kernel": [
        1,
        2,
        1
      ],
      "passes": 2,
      "padding": 3
    },
    "boundary": "padded"
  },
  "normalization": {
    "sourceCenter": [
      0.5229211933910847,
      0.5136808827519417,
      0.29348134994506836
    ],
    "scale": 6.201499145402784,
    "radius": 3,
    "transform": "X=(sourceX-cx)*s, Y=(yearHeight-cz)*s, Z=-(sourceY-cy)*s"
  },
  "coordinateMeaning": "Original XY similarity layout; original publication year mapped to height 0..0.55 over 1800..2026. Not a learned 3D embedding.",
  "limitations": [
    "Static subset of an existing backdrop sample, not all papers or a complete corpus.",
    "Surfaces are smoothed relative sample density of the first 8 fields, not exact topic boundaries.",
    "Padded surface closure can extend beyond the paper domain; it is not future papers.",
    "Display colors are muted field identifiers. Surface contour lines are year-height decoration, not citation links.",
    "No author names, titles, account data, or private company data are included."
  ],
  "geometryBytes": 1396160,
  "geometryGzipBytes": 474441,
  "triangles": 21520
}