{
  "source": "analytic",
  "method": "box 60x60x10 (z -10..0) + upper hemisphere r12 + spherical cap h2 below z=-10 (V = pi h^2(3R-h)/3, A = 2 pi R h) - lower half torus R22 r4 (Pappus: V = pi r^2/2 * 2 pi R, centroid -4r/3pi, A = pi r * 2 pi R); top loses disc r12 and annulus 18..26, bottom loses disc r sqrt(44)",
  "body_count": 1,
  "volume_mm3": 36287.43285471473,
  "area_mm2": 10696.165473259409,
  "center_of_mass": [
    0.0,
    0.0,
    -4.390960875015068
  ],
  "bbox": {
    "min": [
      -30.0,
      -30.0,
      -12.0
    ],
    "max": [
      30.0,
      30.0,
      12.0
    ]
  },
  "faces": 10,
  "note": "faces: bottom, 4 sides, top split by the groove into an annulus (r 12..18) and the outer part, upper sphere, lower cap, torus"
}