{
  "source": "analytic",
  "method": "square frame: the lines' 40 mm square walled 3 mm inside and 1 mm outside (mitred corners) is 42 x 42 less 34 x 34, 10 mm tall: V = (42^2 - 34^2) * 10, A = 2 (42^2 - 34^2) + 4 * 42 * 10 + 4 * 34 * 10",
  "body_count": 1,
  "volume_mm3": 6080.0,
  "area_mm2": 4256.0,
  "center_of_mass": [
    0.0,
    0.0,
    5.0
  ],
  "bbox": {
    "min": [
      -21.0,
      -21.0,
      0.0
    ],
    "max": [
      21.0,
      21.0,
      10.0
    ]
  },
  "faces": 10
}