Admin 9821263b2c fab: a 3D creation shell and the viewer built on it — colour picker, material textures, dials that move the scene while they drag, the glTF loader, the tour, and the probes

Squashed from work; the fine-grained history is under tag archive/work-2026-08-26:
- fab: a 3D creation shell and the viewer built on it
- raytrace: the traced pane starts coarse and doubles to native, with the raster underneath
- fab: a colour picker, a material's textures, and dials that move the scene while they drag
- texcomp: the block codec and the container every texture will travel in
- fab: FAB_PROBE_MAT — per-material triangle counts, texture presence and uv spread in the roof probe

2026-08-26 08:49:47 +02:00

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Fab glTF loader

The in-tree reference loader builds an editable Fab Document from glTF or GLB. Architectural metadata uses this minimal open vocabulary:

{
  "node.extras": {
    "arch": {
      "kind": "wall|slab|roof|window|door|stair|column|beam|site|...",
      "level": 0,
      "level_name": "Ground Floor",
      "id": "stable source id",
      "material_class": "glass|wood|metal|concrete|plaster|..."
    },
    "props": {}
  },
  "scene.extras": {
    "arch": {
      "units": "m",
      "levels": [{ "index": 0, "name": "Ground Floor", "elevation": 0.0 }]
    }
  }
}

arch.kind is an open lower-case set. Scene metadata may also carry arch.north_deg and arch.site; readers accept the older elevation_m level field for compatibility, but writers use elevation.

Node extras use { "arch": { "kind", "priority", "level", "level_name", "id", "material_class", "area_m2", "volume_m3" }, "props": { ... } }; scene extras carry arch.units, north_deg, site, and indexed levels with elevations. The loader maps arch.kind to the element class and retains numeric arch.priority as the render-order hint used only to resolve measured coplanar overlaps (higher values win); geometry, picking, and measurement remain unchanged.

For architectural depth ties, node arch.coplanar_priority is a stable integer and the higher value wins only when faces are coplanar. Material extras may carry arch.material_class (including glass), alongside standard KHR_materials_transmission and KHR_materials_ior; site additionally accepts city, timezone_min, summer_time, date_local (YYYY-MM-DDTHH:MM when a full local calendar date exists), or the source-exact day_of_year and minute_of_day when no year was authored.

The optional arch.site object uses lat, lon, and elevation_m, plus date (YYYY-MM-DD), time (HH:MM local civil time), utc_offset_hours (standard hours east of UTC), and dst (adds one hour); the converter may also write city, timezone_min, summer_time, date_local, day_of_year and minute_of_day, and the loader keeps every present key as arch.site.* Fab document metadata while project north remains arch.north_deg.

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Fab glTF loader

2.2 KiB

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