run 20260428T232955Z-9e26

Summary

Prompt

Make a single solid consisting of a cube with a hemispherical dome fused onto its top face. Cube: 40mm × 40mm × 40mm, centered in X and Y with the bottom face on the XY plane (so it spans x in [-20, 20], y in [-20, 20], z in [0, 40]). Dome: a hemisphere of radius 15mm sitting on top of the cube, centered on the Z axis. The flat (circular) face of the hemisphere is flush with the top face of the cube at z = 40, and the dome extends upward from there. The two parts are joined into a single solid (their shared circular interface is internal, not a face). Note: the kernel only has a full Sphere primitive — to get a hemisphere you must boolean a sphere with a half-space (e.g. intersect a sphere with a large cube positioned at z ≥ 40).

Checks

params: {
  "type": "valid_solid"
}

details: {
  "root_count": 1,
  "solids_produced": 1
}

params: {
  "type": "bbox",
  "min": [
    -20,
    -20,
    0
  ],
  "max": [
    20,
    20,
    55
  ],
  "tolerance_mm": 0.2
}

details: {
  "actual_max": [
    40,
    40,
    40
  ],
  "actual_min": [
    0,
    0,
    0
  ],
  "deviation_max": [
    20,
    20,
    -15
  ],
  "deviation_min": [
    20,
    20,
    0
  ],
  "max_abs_deviation_mm": 20,
  "tolerance_mm": 0.2
}

params: {
  "type": "mass_props",
  "volume_mm3": 71068.58,
  "tolerance_pct": 2
}

details: {
  "volume": {
    "actual_mm3": 64000,
    "deviation_pct": 9.946139348781138,
    "pass": false,
    "spec_mm3": 71068.58,
    "tolerance_pct": 2
  }
}

params: {
  "type": "step_roundtrip",
  "tolerance_pct": 2
}

details: {
  "per_solid": [
    {
      "index": 0,
      "pass": false,
      "reason": "solid is not BRep-backed (mesh-only after a boolean fallback?)"
    }
  ],
  "tolerance_pct": 2
}

Tool calls

{
  "model": "gpt-4o-mini",
  "max_tokens": 8000,
  "system_chars": 1674,
  "user_chars": 808
}

What the model built

isometric render via vcad-render · the model's actual .vcad output, faceted at 28 segments per cylinder · download 20260428T232955Z-9e26.vcad

.vcad source

{
  "version": "0.1",
  "nodes": {
    "1": {
      "id": 1,
      "name": "Cube",
      "op": {
        "type": "Cube",
        "size": {
          "x": 40,
          "y": 40,
          "z": 40
        }
      }
    },
    "2": {
      "id": 2,
      "name": "Sphere",
      "op": {
        "type": "Sphere",
        "radius": 15,
        "segments": 32
      }
    },
    "3": {
      "id": 3,
      "name": "Cube for Hemisphere",
      "op": {
        "type": "Cube",
        "size": {
          "x": 100,
          "y": 100,
          "z": 100
        }
      }
    },
    "4": {
      "id": 4,
      "name": "Half-Space",
      "op": {
        "type": "Translate",
        "child": 3,
        "offset": {
          "x": 0,
          "y": 0,
          "z": 40
        }
      }
    },
    "5": {
      "id": 5,
      "name": "Hemispherical Dome",
      "op": {
        "type": "Intersection",
        "left": 2,
        "right": 4
      }
    },
    "6": {
      "id": 6,
      "name": "Final Solid",
      "op": {
        "type": "Union",
        "left": 1,
        "right": 5
      }
    }
  },
  "materials": {},
  "part_materials": {},
  "roots": [
    {
      "root": 6,
      "material": "default"
    }
  ]
}

generated 2026-06-19T01:47:55.955Z · static site, regenerate with npm run build -w @mecheval/leaderboard