{
  "date": "2026-10-31",
  "environment": "Local development site in the available in-app browser. No production deployment or physical testing.",
  "viewports": [
    {
      "width": 1280,
      "height": 720,
      "kind": "desktop"
    },
    {
      "width": 390,
      "height": 844,
      "kind": "mobile-width layout; native mouse input, not a real touchscreen"
    }
  ],
  "actualDownloads": [
    {
      "path": "/examples/feature-measurement/browser-stl-unknown-unit.json",
      "sha256": "8b0b8a40a222ae0f32b3353630fa3fe2303bbd078f3537645b42c172f2ceedea",
      "entries": 1
    },
    {
      "path": "/examples/feature-measurement/browser-stl-record.json",
      "sha256": "322ab86340ca207c447c5c79c15e893333d3d702a9e64c9b82cc13a457571ff3",
      "entries": 3
    },
    {
      "path": "/examples/feature-measurement/browser-3mf-record.json",
      "sha256": "f8099942db98b5154c8230a70602ef865f7d27d07b45aea08f83d944f7669e3b",
      "entries": 3
    },
    {
      "path": "/examples/feature-measurement/browser-bore12-record.json",
      "sha256": "443a6cfd5ec600d7acd2036697695251935c4461f67f3dc90e4e2fc371521961",
      "entries": 1
    },
    {
      "path": "/examples/feature-measurement/browser-bore48-record.json",
      "sha256": "e7f5dda6f919579ec1237f97ff788dd132e103974366414d73c8c22677f896a1",
      "entries": 1
    },
    {
      "path": "/examples/feature-measurement/browser-ellipse-record.json",
      "sha256": "56d13cb84457ce89cab24d5c497a9aff9f5adc7b4b0c6a86ed8ed6d9c6e6c0ed",
      "entries": 2
    }
  ],
  "observations": [
    {
      "viewer": "STL",
      "interaction": "Mesh vertex picks through visible canvas; unknown source unit",
      "points": [
        [0, 0, 0],
        [10, 0, 0],
        [5, 8.66025447845459, 0]
      ],
      "angleDegrees": 60.0000012622552,
      "circleRadiusCoordinateUnits": 5.77350283876633,
      "circleDiameterCoordinateUnits": 11.54700567753266,
      "basis": "Actual displayed Float32 mesh points restored to source frame. Saved angle survived reset and zoom."
    },
    {
      "viewer": "STL",
      "interaction": "Distance, angle and circle made through visible canvas at mobile width",
      "distanceMm": 10,
      "angleDegrees": 60.0000012622552,
      "circleDiameterMm": 11.54700567753266,
      "points": "Same cardinal coupon vertices. Display unit mm after explicit STL interpretation. Native drag and fullscreen exit did not change recorded distance."
    },
    {
      "viewer": "3MF",
      "interaction": "Distance across two visible placed-item vertices, desktop and mobile width",
      "points": [
        [10, 40, 30],
        [50, 30, 30]
      ],
      "placedItemIds": ["build-1", "build-2"],
      "distanceMm": 41.23105625617661,
      "absoluteDeltaMm": [40, 10, 0],
      "declaredSourceUnit": "centimeter",
      "frame": "resolved millimetre build coordinates"
    },
    {
      "viewer": "3MF",
      "interaction": "Angle and circle made through visible mesh vertices, desktop and mobile width",
      "points": [
        [10, 40, 30],
        [-10, 20, 30],
        [10, 20, 50]
      ],
      "placedItemIds": ["build-1"],
      "angleDegrees": 59.99999999999999,
      "circleRadiusMm": 16.32993161855452,
      "circleDiameterMm": 32.65986323710904
    },
    {
      "viewer": "3MF",
      "interaction": "Normal labelled coordinate inputs and add-point buttons",
      "points": [
        [10, 20, 30],
        [50, 20, 30]
      ],
      "basis": "Entered coordinates, explicitly not verified mesh picks",
      "distanceMm": 40
    },
    {
      "viewer": "3MF",
      "interaction": "Replacement lifecycle through actual example selector",
      "cancelled": "Explicit cancellation preserved prior model and saved entry. Cancellation status was shown.",
      "failed": "Existing invalid-build-reference control reported missing/cyclic reference 99 and preserved the prior valid model/entry.",
      "successful": "A valid replacement cleared the record to zero entries."
    },
    {
      "control": "browser-bore12-record.json",
      "interaction": "Actual canvas Mesh vertex picks at Z=8; millimetre STL interpretation. Names saved and JSON downloaded through visible controls.",
      "entries": [
        {
          "name": "12-sided bore rim",
          "type": "circle",
          "points": [
            {
              "coordinates": [10, 0, 8],
              "basis": "mesh-vertex",
              "meshId": "mesh-19",
              "faceIndex": 92,
              "vertexIndex": 278
            },
            {
              "coordinates": [6.123233998228043e-16, 10, 8],
              "basis": "mesh-vertex",
              "meshId": "mesh-19",
              "faceIndex": 29,
              "vertexIndex": 87
            },
            {
              "coordinates": [-10, 1.2246467996456087e-15, 8],
              "basis": "mesh-vertex",
              "meshId": "mesh-19",
              "faceIndex": 53,
              "vertexIndex": 159
            }
          ],
          "result": {
            "state": "available",
            "centre": [0, 0, 8],
            "radius": 10,
            "diameter": 20,
            "normal": [0, 0, 1],
            "axisU": [1, 0, 0],
            "axisV": [0, 1, 0]
          }
        }
      ]
    },
    {
      "control": "browser-bore48-record.json",
      "interaction": "Actual canvas Mesh vertex picks at Z=8; millimetre STL interpretation. Names saved and JSON downloaded through visible controls.",
      "entries": [
        {
          "name": "48-sided bore rim",
          "type": "circle",
          "points": [
            {
              "coordinates": [10, 0, 8],
              "basis": "mesh-vertex",
              "meshId": "mesh-54",
              "faceIndex": 380,
              "vertexIndex": 1142
            },
            {
              "coordinates": [6.123233998228043e-16, 10, 8],
              "basis": "mesh-vertex",
              "meshId": "mesh-54",
              "faceIndex": 101,
              "vertexIndex": 303
            },
            {
              "coordinates": [-10, 1.2246467996456087e-15, 8],
              "basis": "mesh-vertex",
              "meshId": "mesh-54",
              "faceIndex": 197,
              "vertexIndex": 591
            }
          ],
          "result": {
            "state": "available",
            "centre": [0, 0, 8],
            "radius": 10,
            "diameter": 20,
            "normal": [0, 0, 1],
            "axisU": [1, 0, 0],
            "axisV": [0, 1, 0]
          }
        }
      ]
    },
    {
      "control": "browser-ellipse-record.json",
      "interaction": "Actual canvas Mesh vertex picks at Z=8; millimetre STL interpretation. Names saved and JSON downloaded through visible controls.",
      "entries": [
        {
          "name": "Ellipse cardinal construction A",
          "type": "circle",
          "points": [
            {
              "coordinates": [10, 0, 8],
              "basis": "mesh-vertex",
              "meshId": "mesh-89",
              "faceIndex": 5,
              "vertexIndex": 15
            },
            {
              "coordinates": [6.123233998228043e-16, 5, 8],
              "basis": "mesh-vertex",
              "meshId": "mesh-89",
              "faceIndex": 100,
              "vertexIndex": 300
            },
            {
              "coordinates": [-10, 6.123233998228043e-16, 8],
              "basis": "mesh-vertex",
              "meshId": "mesh-89",
              "faceIndex": 197,
              "vertexIndex": 591
            }
          ],
          "result": {
            "state": "available",
            "centre": [0, -7.500000000000002, 8],
            "radius": 12.500000000000002,
            "diameter": 25.000000000000004,
            "normal": [0, 0, 1],
            "axisU": [0.7999999999999999, 0.6000000000000001, 0],
            "axisV": [-0.6000000000000001, 0.7999999999999999, 0]
          }
        },
        {
          "name": "Ellipse cardinal construction B",
          "type": "circle",
          "points": [
            {
              "coordinates": [10, 0, 8],
              "basis": "mesh-vertex",
              "meshId": "mesh-89",
              "faceIndex": 5,
              "vertexIndex": 15
            },
            {
              "coordinates": [6.123233998228043e-16, 5, 8],
              "basis": "mesh-vertex",
              "meshId": "mesh-89",
              "faceIndex": 100,
              "vertexIndex": 300
            },
            {
              "coordinates": [-1.8369700935892946e-15, -5, 8],
              "basis": "mesh-vertex",
              "meshId": "mesh-89",
              "faceIndex": 293,
              "vertexIndex": 879
            }
          ],
          "result": {
            "state": "available",
            "centre": [3.7499999999999982, -9.697399036122168e-16, 8],
            "radius": 6.250000000000002,
            "diameter": 12.500000000000004,
            "normal": [0, 0, 1],
            "axisU": [1, 1.5515838457795464e-16, 0],
            "axisV": [-1.5515838457795464e-16, 1, 0]
          }
        }
      ]
    }
  ],
  "limitations": [
    "Mobile-width checks used native mouse input. Real-device pinch and touch-radius interaction were not exercised; multi-pointer rejection is covered by event regression tests.",
    "The current in-app browser did not expose a network capture. Privacy is enforced by local-only implementation and data-contract regression checks, not a retained browser network trace.",
    "Actual browser downloads are separate from independently regenerated calculation observations. No screenshot or calibrated physical measurement is inferred from these records."
  ]
}