{
  "kind": "bimfit_reference_building_manifest",
  "schemaVersion": 1,
  "id": "kit-office",
  "name": {
    "ko": "KIT 오피스",
    "en": "KIT Office"
  },
  "summary": {
    "ko": "KIT IAI가 공개한 사무·연구시설 예제 모델. 실제 부지의 건물이 아닌 IFC 검증용 설계입니다.",
    "en": "KIT IAI's fictional office and laboratory example, released for IFC validation; not a surveyed building."
  },
  "useType": "office_building",
  "licence": "KIT/IAI unrestricted use (attribution required)",
  "attribution": "Institute for Automation and Applied Informatics (IAI), Karlsruhe Institute of Technology (KIT), \"AC20-Institute-Var-2\" — https://www.ifcwiki.org/index.php?title=KIT_IFC_Examples",
  "sourceUrl": "https://www.ifcwiki.org/index.php?title=KIT_IFC_Examples",
  "generatedAt": "2026-09-07T00:00:00.000Z",
  "sourceFiles": [
    {
      "role": "architectural",
      "fileName": "AC20-Institute-Var-2.ifc",
      "sha256": "cfb2124497b25d9a72101075e84be0feb44ff669cb1bd3251be11efebeea945c",
      "byteLength": 10934237,
      "units": {
        "lengthToMetres": 1,
        "areaToSquareMetres": 1,
        "lengthUnitName": "METRE",
        "areaUnitName": "SQUARE_METRE",
        "lengthAssumed": false,
        "areaAssumed": false
      }
    }
  ],
  "counts": {
    "storeys": 5,
    "spacesTotal": 82,
    "spacesFloor": 82,
    "assemblies": 4,
    "externalElements": 0,
    "exteriorWalls": 44,
    "windows": 206,
    "exteriorCurtainWalls": 0,
    "exteriorDoors": 1,
    "externalElementsNote": "362 external physical space boundaries exist and none resolved: swept curve is not a readable polyline. The classifier reads IfcSurfaceOfLinearExtrusion (Revit); this file's boundaries are another surface type. Envelope areas here come from stated wall NetSideArea or solid geometry. Exterior wall membership uses the boundary's element reference and PHYSICAL/EXTERNAL flags directly; it does not require a readable boundary surface or consume its area."
  },
  "areas": {
    "totalFloorAreaSqm": 2266.66,
    "areaPlanTotalSqm": 2266.66,
    "exteriorWallNetSqm": 940.81,
    "exteriorWallNote": "44 walls selected by IfcRelSpaceBoundary PHYSICAL/EXTERNAL element references; area from each wall's stated NetSideArea (openings already removed). Boundary surface areas are not used.",
    "exteriorWallBelowRoofSqm": 868.36,
    "exteriorWallAboveRoofSqm": 72.45,
    "exteriorWallByOrientationSqm": {
      "N": 312.63,
      "NE": 0,
      "E": 162.32,
      "SE": 0,
      "S": 304.36,
      "SW": 0,
      "W": 161.51,
      "NW": 0
    },
    "glazingApertureSqm": 309.5,
    "glazingByOrientationSqm": {
      "N": 144,
      "NE": 0,
      "E": 5.85,
      "SE": 0,
      "S": 153.8,
      "SW": 0,
      "W": 5.85,
      "NW": 0
    },
    "exteriorDoorSqm": 4.2,
    "exteriorDoorByOrientationSqm": {
      "N": 0,
      "NE": 0,
      "E": 0,
      "SE": 0,
      "S": 4.2,
      "SW": 0,
      "W": 0,
      "NW": 0
    },
    "openingsNote": "Glazing aperture 309.5 m² = 206 IfcWindow at OverallWidth × OverallHeight (309.5 m²). Exterior doors are separate — a door is aperture, not glazing: 1 IfcDoor, 4.2 m², OverallWidth × OverallHeight. Host wall by IfcRelFillsElement → IfcOpeningElement → IfcRelVoidsElement (207 openings). Sector is the host wall's, from the same orientation pass as the wall split. Envelope by a both-sides probe against the conditioned IfcSpace solids (82 of 82 have geometry); this file has no IfcCurtainWall; 76 openings hosted in walls outside the exterior set; nothing unresolved. IsExternal is reported per row and never used as a filter — it means \"not an interior partition\" to an authoring tool, never \"bounds conditioned space against outdoor air\". It marks 0 door(s) here; 0 confirm against an exterior wall. Rows in openings.json.",
    "conditionedVolumeGrossM3": 6227.27,
    "roomVolumeNetM3": 5500.66,
    "volumeNote": "Gross from 82 spaces (floor area × storey height; voids, and rooms taller than their storey with no void above, as their own solids); net from 82 spaces (82 from stated volume quantity). A closed tessellation's signed volume is exact.",
    "roofProjectedSqm": 632,
    "roofProjectedByFamilySqm": {
      "Dach-001": 632
    },
    "roofElementSumSqm": 682.62,
    "roofUnionSqm": 632,
    "roofSurfaceSqm": 793.93,
    "roofSurfaceByFamilySqm": {
      "Dach-001": 793.93
    },
    "roofNote": "Plan shadow per element (union of its projected triangles, ifc-plan-shadow.mjs): 21 elements — 21 IfcSlab.PredefinedType=ROOF. roofProjectedSqm sums 1 roof type(s), each as the union of its elements; the elements themselves sum to 682.62 m² (elements of one type overlapping in plan) and all types together cover 632 m² (one type above another). surfaceSqm is each element's true one-sheet surface (Σ area of its upward faces; ÷ 2 where a surface model has no downward face and both sheets are wound upward; ÷ the coverage where its parts cover its shadow more than once, as stacked layer solids do — surfaceBasis says which), summing to 793.93 m²; a flat deck's surface equals its shadow, a pitched roof's exceeds it. Dach-001 consists of 21 IfcSlab ROOF strips forming curved roofs. Their surfaces are measured individually; no single flat or gable typology is asserted.",
    "groundSlabSqm": 516,
    "groundSlabSumSqm": 516,
    "groundPerimeterM": 112,
    "groundHolePerimeterM": 0,
    "groundNote": "IfcSlab (not ROOF or LANDING) on storeys at or below Keller (-3 m): 1 candidate(s). A slab counts as ground envelope when a conditioned space stands on it — its shadow overlaps a conditioned ground-storey space footprint (17 of 17 such spaces have one: 17 solid) or an IfcRelSpaceBoundary names it as bounding one. IsExternal is not consulted. 1 counted, 0 excluded. groundSlabSqm is the union of the counted shadows (they sum to 516 m²; stacked build-up layers count once); groundPerimeterM is the outline's outer ring."
  },
  "assemblies": [
    {
      "id": "assembly-stahlbeton-2747937872-0-3",
      "name": "Stahlbeton 2747937872 0.3",
      "totalThicknessM": 0.3,
      "layers": [
        {
          "name": "Stahlbeton 2747937872",
          "thicknessM": 0.3,
          "ref": "ifc://AC20-Institute-Var-2.ifc#22657"
        }
      ],
      "ref": "ifc://AC20-Institute-Var-2.ifc#22659"
    },
    {
      "id": "assembly-kalksandstein-2816491304-0-3",
      "name": "Kalksandstein 2816491304 0.3",
      "totalThicknessM": 0.3,
      "layers": [
        {
          "name": "Kalksandstein 2816491304",
          "thicknessM": 0.3,
          "ref": "ifc://AC20-Institute-Var-2.ifc#31215"
        }
      ],
      "ref": "ifc://AC20-Institute-Var-2.ifc#31216"
    },
    {
      "id": "assembly-kalksandstein-2816491304-0-2",
      "name": "Kalksandstein 2816491304 0.2",
      "totalThicknessM": 0.2,
      "layers": [
        {
          "name": "Kalksandstein 2816491304",
          "thicknessM": 0.2,
          "ref": "ifc://AC20-Institute-Var-2.ifc#53013"
        }
      ],
      "ref": "ifc://AC20-Institute-Var-2.ifc#53014"
    },
    {
      "id": "assembly-kalksandstein-2774059904-0-3",
      "name": "Kalksandstein 2774059904 0.3",
      "totalThicknessM": 0.3,
      "layers": [
        {
          "name": "Kalksandstein 2774059904",
          "thicknessM": 0.3,
          "ref": "ifc://AC20-Institute-Var-2.ifc#57233"
        }
      ],
      "ref": "ifc://AC20-Institute-Var-2.ifc#57234"
    }
  ],
  "orientation": {
    "trueNorthDeg": null,
    "northAssumed": true,
    "weakOutwardCount": 0,
    "offCardinalCount": 0,
    "offCardinalSqm": 0,
    "wallCount": 44,
    "note": "Azimuths are clockwise from north, where north is the model's -Z after web-ifc's Z-up to Y-up conversion. Outward face inferred by comparing each face's centroid with the building centre, which is correct for a convex plan and can be wrong at a re-entrant corner."
  },
  "site": {
    "declaredSiteName": "Gelaende 0815",
    "declaredLatitudeDeg": 49.15,
    "declaredLongitudeDeg": 8.716666666666667,
    "locationIsAuthoringDefault": true,
    "locationNote": "IfcSite.Description explicitly states 'No real site'. The coordinate is an example location, not a surveyed site; the page uses a separately named Seoul climate assumption.",
    "statedTown": null,
    "trueNorthStated": false
  },
  "storeys": [
    {
      "id": "storey-keller",
      "name": "Keller",
      "elevationM": -3,
      "floorToFloorHeightM": 3,
      "spaceCount": 17,
      "floorAreaSqm": 451.7,
      "ref": "ifc://AC20-Institute-Var-2.ifc#1353"
    },
    {
      "id": "storey-erdgeschoss",
      "name": "Erdgeschoss",
      "elevationM": 0,
      "floorToFloorHeightM": 3,
      "spaceCount": 18,
      "floorAreaSqm": 455.8,
      "ref": "ifc://AC20-Institute-Var-2.ifc#58268"
    },
    {
      "id": "storey-1-obergeschoss",
      "name": "1. Obergeschoss",
      "elevationM": 3,
      "floorToFloorHeightM": 3,
      "spaceCount": 22,
      "floorAreaSqm": 441.62,
      "ref": "ifc://AC20-Institute-Var-2.ifc#115253"
    },
    {
      "id": "storey-2-obergeschoss",
      "name": "2. Obergeschoss",
      "elevationM": 6,
      "floorToFloorHeightM": 3,
      "spaceCount": 22,
      "floorAreaSqm": 441.62,
      "ref": "ifc://AC20-Institute-Var-2.ifc#167898"
    },
    {
      "id": "storey-dachgeschoss",
      "name": "Dachgeschoss",
      "elevationM": 9,
      "floorToFloorHeightM": 0,
      "spaceCount": 3,
      "floorAreaSqm": 475.92,
      "ref": "ifc://AC20-Institute-Var-2.ifc#220293"
    }
  ],
  "spacesFile": "spaces.json",
  "roofs": [
    {
      "id": "roof-221140",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 39.59,
      "upFacingProjectedSqm": 39.59,
      "tiltDeg": 32.6,
      "surfaceSqm": 46.97,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#221140"
    },
    {
      "id": "roof-221373",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 39.83,
      "upFacingProjectedSqm": 39.83,
      "tiltDeg": 32,
      "surfaceSqm": 46.97,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#221373"
    },
    {
      "id": "roof-221585",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 39.73,
      "upFacingProjectedSqm": 39.73,
      "tiltDeg": 0,
      "surfaceSqm": 39.73,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#221585"
    },
    {
      "id": "roof-221797",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 39.83,
      "upFacingProjectedSqm": 39.83,
      "tiltDeg": 32,
      "surfaceSqm": 46.97,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#221797"
    },
    {
      "id": "roof-222009",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 39.59,
      "upFacingProjectedSqm": 39.59,
      "tiltDeg": 32.6,
      "surfaceSqm": 46.97,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#222009"
    },
    {
      "id": "roof-222221",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 38.48,
      "upFacingProjectedSqm": 38.48,
      "tiltDeg": 35,
      "surfaceSqm": 46.97,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#222221"
    },
    {
      "id": "roof-222433",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 18.46,
      "upFacingProjectedSqm": 18.46,
      "tiltDeg": 32.9,
      "surfaceSqm": 21.99,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#222433"
    },
    {
      "id": "roof-222645",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 18.88,
      "upFacingProjectedSqm": 18.88,
      "tiltDeg": 30.8,
      "surfaceSqm": 21.99,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#222645"
    },
    {
      "id": "roof-222857",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 18.98,
      "upFacingProjectedSqm": 18.98,
      "tiltDeg": 30.3,
      "surfaceSqm": 21.99,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#222857"
    },
    {
      "id": "roof-223069",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 18.94,
      "upFacingProjectedSqm": 18.94,
      "tiltDeg": 0,
      "surfaceSqm": 18.94,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#223069"
    },
    {
      "id": "roof-223281",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 18.98,
      "upFacingProjectedSqm": 18.98,
      "tiltDeg": 30.3,
      "surfaceSqm": 21.99,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#223281"
    },
    {
      "id": "roof-223493",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 18.88,
      "upFacingProjectedSqm": 18.88,
      "tiltDeg": 30.8,
      "surfaceSqm": 21.99,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#223493"
    },
    {
      "id": "roof-223705",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 18.46,
      "upFacingProjectedSqm": 18.46,
      "tiltDeg": 32.9,
      "surfaceSqm": 21.99,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#223705"
    },
    {
      "id": "roof-223917",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 38.48,
      "upFacingProjectedSqm": 38.48,
      "tiltDeg": 35,
      "surfaceSqm": 46.97,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#223917"
    },
    {
      "id": "roof-224129",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 39.59,
      "upFacingProjectedSqm": 39.59,
      "tiltDeg": 32.6,
      "surfaceSqm": 46.97,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#224129"
    },
    {
      "id": "roof-224341",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 39.83,
      "upFacingProjectedSqm": 39.83,
      "tiltDeg": 32,
      "surfaceSqm": 46.97,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#224341"
    },
    {
      "id": "roof-224553",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 39.73,
      "upFacingProjectedSqm": 39.73,
      "tiltDeg": 0,
      "surfaceSqm": 39.73,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#224553"
    },
    {
      "id": "roof-224765",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 39.83,
      "upFacingProjectedSqm": 39.83,
      "tiltDeg": 32,
      "surfaceSqm": 46.97,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#224765"
    },
    {
      "id": "roof-224977",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 39.59,
      "upFacingProjectedSqm": 39.59,
      "tiltDeg": 32.6,
      "surfaceSqm": 46.97,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#224977"
    },
    {
      "id": "roof-225189",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 38.48,
      "upFacingProjectedSqm": 38.48,
      "tiltDeg": 35,
      "surfaceSqm": 46.97,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#225189"
    },
    {
      "id": "roof-225401",
      "name": "Dach-001",
      "family": "Dach-001",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-dachgeschoss",
      "projectedSqm": 38.48,
      "upFacingProjectedSqm": 38.48,
      "tiltDeg": 35,
      "surfaceSqm": 46.97,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#225401"
    }
  ],
  "groundSlabs": [
    {
      "id": "slab-22626",
      "name": "Decke-002",
      "elementType": "IfcSlab",
      "predefinedType": "FLOOR",
      "storeyId": "storey-keller",
      "projectedSqm": 516,
      "countsAsGround": true,
      "evidence": "451.7 m² under 17 conditioned space footprint(s); bounds 17 conditioned space(s) per IfcRelSpaceBoundary",
      "excludedReason": null,
      "ref": "ifc://AC20-Institute-Var-2.ifc#22626"
    }
  ],
  "openingsFile": "openings.json",
  "serviceLayers": [],
  "model": {
    "file": "model.glb",
    "byteLength": 2176020,
    "triangleCount": 40288,
    "groups": [
      "slab",
      "wall",
      "stair",
      "glazing",
      "door"
    ],
    "note": "Building fabric only: walls, slabs, roofs and openings. Furniture, fixtures, railings and the structural frame are not in this file."
  },
  "invalidDiagnostics": {
    "note": "No space-boundary strips resolved in this file; there is no sum to refute.",
    "rawSumSqm": 0,
    "rawSumByElementType": {}
  },
  "architecturalDetails": {
    "id": "details",
    "ko": "건축 상세",
    "en": "Architectural details",
    "file": "architectural-details.glb",
    "byteLength": 27080,
    "sha256": "2291d8abb3c6dc2a167ee4216a84db70fb30574e25dc229c7156ea5f8761b588",
    "triangleCount": 252,
    "placedTriangleCount": 3264,
    "triangleCountBasis": "triangleCount stores each instanced shape once; placedTriangleCount includes every placement",
    "groups": [
      "furnishing",
      "railing",
      "column"
    ],
    "elements": 267,
    "distinctGeometries": 5,
    "instancedShapes": 2,
    "instancedPlacements": 253,
    "drawCalls": 4,
    "materials": 3,
    "sourceFiles": [
      {
        "role": "architectural",
        "fileName": "AC20-Institute-Var-2.ifc",
        "sha256": "cfb2124497b25d9a72101075e84be0feb44ff669cb1bd3251be11efebeea945c",
        "types": [
          {
            "type": "IfcFurnishingElement",
            "candidates": 253,
            "rendered": 253,
            "withoutRenderedMesh": 0
          },
          {
            "type": "IfcRailing",
            "candidates": 12,
            "rendered": 12,
            "withoutRenderedMesh": 0
          },
          {
            "type": "IfcColumn",
            "candidates": 2,
            "rendered": 2,
            "withoutRenderedMesh": 0
          }
        ]
      }
    ],
    "indexFile": "architectural-details-index.json",
    "indexSha256": "106494f67543fe3932ea07271ed0da3c1b99fa12a6b8018eccb9183e3646c723",
    "appearance": "web-ifc tessellator RGBA, including possible default styles; no inferred finish textures. Metalness 0 and roughness 0.85 are renderer assumptions, not measured material properties.",
    "note": "Selected source IFC entity classes omitted from the core fabric layer. Original tessellated geometry and placements; repeated shapes use GPU instancing. Not a claim of complete architectural or fabrication detail. Existing services remain separate."
  },
  "mepCoverage": {
    "schemaVersion": 1,
    "status": "no_typed_mep_occurrences",
    "publishedLayerIds": [],
    "typedElementCount": 0,
    "distributionPortCount": 0,
    "sources": [
      {
        "role": "architectural",
        "fileName": "AC20-Institute-Var-2.ifc",
        "sha256": "cfb2124497b25d9a72101075e84be0feb44ff669cb1bd3251be11efebeea945c",
        "schema": "IFC4",
        "typedElementCount": 0,
        "entitiesByType": {},
        "distributionPorts": 0,
        "systems": 0
      }
    ],
    "summary": {
      "ko": "제공된 IFC에는 분류된 MEP 요소와 배관·덕트 포트가 없습니다. 일반 가구·프록시는 설비로 추정하지 않습니다.",
      "en": "The supplied IFC contains no typed MEP elements or distribution ports. Generic furniture and proxies are not interpreted as services."
    },
    "limitations": [
      {
        "ko": "해시로 고정된 IFC 파일에서 해당 스키마의 설비 분류 상속을 확인한 요소 목록이며, 실제 설치 설비의 완전성 조사가 아닙니다.",
        "en": "Inventory of distribution occurrence classes using each pinned IFC file's schema inheritance, not a completeness survey of installed services."
      },
      {
        "ko": "분야별·수정본 모델 간 요소가 중복될 수 있으며 파일 간 설비 중복 제거는 하지 않았습니다.",
        "en": "Counts include overlapping discipline and revision models; there is no cross-file equipment deduplication."
      },
      {
        "ko": "일반 IfcBuildingElementProxy·IfcFurnishingElement는 원본 근거 없이 MEP로 분류하지 않습니다.",
        "en": "Generic IfcBuildingElementProxy and IfcFurnishingElement occurrences are not classified as MEP without source evidence."
      }
    ]
  },
  "materialFabric": {
    "file": "material-fabric.glb",
    "byteLength": 235124,
    "sha256": "338ed94b5e3e99776c00237a6e9674e097d28d40559427bc407bbe566b446c33",
    "indexFile": "material-fabric-index.json",
    "indexSha256": "a1ad5ac37c1bfb45d2c0547487cdba0586ced19f7bdfd9d933805961ff77db3d",
    "elements": 434,
    "triangleCount": 11015,
    "placedTriangleCount": 40288,
    "drawCalls": 26,
    "bindings": [
      {
        "key": "slab__architectural_22659",
        "group": "slab",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://AC20-Institute-Var-2.ifc#22659",
        "materialRef": "ifc://AC20-Institute-Var-2.ifc#22662",
        "materialNames": [
          "Stahlbeton 2747937872"
        ],
        "relationRef": "ifc://AC20-Institute-Var-2.ifc#22664",
        "basis": "occurrence",
        "assemblyName": "Stahlbeton 2747937872 0.3",
        "representativeLayer": {
          "name": "Stahlbeton 2747937872",
          "thicknessM": 0.3,
          "ref": "ifc://AC20-Institute-Var-2.ifc#22657"
        },
        "elements": 5
      },
      {
        "key": "slab__architectural_221144",
        "group": "slab",
        "sourceRole": "architectural",
        "status": "single_material",
        "assemblyRef": null,
        "materialRef": "ifc://AC20-Institute-Var-2.ifc#221144",
        "materialNames": [
          "Aluminium 131198"
        ],
        "relationRef": "ifc://AC20-Institute-Var-2.ifc#221157",
        "basis": "occurrence",
        "assemblyName": null,
        "representativeLayer": null,
        "elements": 21
      },
      {
        "key": "wall__architectural_31216",
        "group": "wall",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://AC20-Institute-Var-2.ifc#31216",
        "materialRef": "ifc://AC20-Institute-Var-2.ifc#31219",
        "materialNames": [
          "Kalksandstein 2816491304"
        ],
        "relationRef": "ifc://AC20-Institute-Var-2.ifc#31220",
        "basis": "occurrence",
        "assemblyName": "Kalksandstein 2816491304 0.3",
        "representativeLayer": {
          "name": "Kalksandstein 2816491304",
          "thicknessM": 0.3,
          "ref": "ifc://AC20-Institute-Var-2.ifc#31215"
        },
        "elements": 59
      },
      {
        "key": "wall__architectural_53014",
        "group": "wall",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://AC20-Institute-Var-2.ifc#53014",
        "materialRef": "ifc://AC20-Institute-Var-2.ifc#53017",
        "materialNames": [
          "Kalksandstein 2816491304"
        ],
        "relationRef": "ifc://AC20-Institute-Var-2.ifc#53018",
        "basis": "occurrence",
        "assemblyName": "Kalksandstein 2816491304 0.2",
        "representativeLayer": {
          "name": "Kalksandstein 2816491304",
          "thicknessM": 0.2,
          "ref": "ifc://AC20-Institute-Var-2.ifc#53013"
        },
        "elements": 54
      },
      {
        "key": "wall__architectural_57234",
        "group": "wall",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://AC20-Institute-Var-2.ifc#57234",
        "materialRef": "ifc://AC20-Institute-Var-2.ifc#57237",
        "materialNames": [
          "Kalksandstein 2774059904"
        ],
        "relationRef": "ifc://AC20-Institute-Var-2.ifc#57238",
        "basis": "occurrence",
        "assemblyName": "Kalksandstein 2774059904 0.3",
        "representativeLayer": {
          "name": "Kalksandstein 2774059904",
          "thicknessM": 0.3,
          "ref": "ifc://AC20-Institute-Var-2.ifc#57233"
        },
        "elements": 8
      },
      {
        "key": "stair__architectural_22135",
        "group": "stair",
        "sourceRole": "architectural",
        "status": "single_material",
        "assemblyRef": null,
        "materialRef": "ifc://AC20-Institute-Var-2.ifc#22135",
        "materialNames": [
          "Stahlbeton"
        ],
        "relationRef": "ifc://AC20-Institute-Var-2.ifc#22136",
        "basis": "occurrence",
        "assemblyName": null,
        "representativeLayer": null,
        "elements": 4
      },
      {
        "key": "glazing__architectural_32591",
        "group": "glazing",
        "sourceRole": "architectural",
        "status": "unsupported",
        "assemblyRef": null,
        "materialRef": "ifc://AC20-Institute-Var-2.ifc#32591",
        "materialNames": [],
        "relationRef": "ifc://AC20-Institute-Var-2.ifc#32593",
        "basis": "occurrence",
        "assemblyName": null,
        "representativeLayer": null,
        "elements": 206
      },
      {
        "key": "door__architectural_32591",
        "group": "door",
        "sourceRole": "architectural",
        "status": "unsupported",
        "assemblyRef": null,
        "materialRef": "ifc://AC20-Institute-Var-2.ifc#32591",
        "materialNames": [],
        "relationRef": "ifc://AC20-Institute-Var-2.ifc#32593",
        "basis": "occurrence",
        "assemblyName": null,
        "representativeLayer": null,
        "elements": 77
      }
    ],
    "appearanceBasis": "IFC occurrence or type material association. For a layer set, the thickest stated layer is used as an illustrative representative, not as the verified exterior finish. Source layer order does not establish installation direction. Unreviewed material names remain neutral. Glazing retains its base role appearance."
  }
}