PRIM-007 · Geometric Primitives · difficulty 2/5
Right hexagonal prism with pitch fillet
sha256:4f8d1f2cba83a911…
§1Prompt verbatim
Hexagonal prism, across-flats 24 mm, height 12 mm, top edge filleted at R 0.4 mm. Solid, manifold, origin centred.
§2Ground-truth spec
bbox27.7 × 24.0 × 12.0 mm
shells1
V−E+F2
genus0
watertighttrue
manifoldtrue
acceptance ε±0.02 mm
§3Reference render
canonical reference · drag to orbit, scroll to zoom
Visualisation is rebuilt in-browser from the canonical parametric description. Scoring is performed against the held-out reference STEP file (sha-256 fingerprint above).
§4Per-agent renders
reference + 10 agent outputs · scored against the held-out STEP
vol IoU · BREP · manifold
canonical reference
REFERENCE
canonical · ground truth
1.000100✓
Human Baseline (Mech-E)
Human Baseline (Mech-E)
n=4 senior engineers
0.9519✓
Zoo Text-to-CAD
Zoo Text-to-CAD
Zoo (KittyCAD)
0.8156✓
DeepCAD
DeepCAD
Wu et al. 2021 (research)
0.74211✓
Claude Opus 4.7 → CadQuery
Claude Opus 4.7 → CadQuery
Anthropic + CadQuery 2.4
0.6528✗
Adam (CADcrush)
Adam (CADcrush)
CADcrush
0.62711✗
GPT-5 → CadQuery
GPT-5 → CadQuery
OpenAI + CadQuery 2.4
0.57811✗
Gemini 2.5 Pro → OpenSCAD
Gemini 2.5 Pro → OpenSCAD
Google + OpenSCAD 2024.06
0.5390✗
Trellis 3D
Trellis 3D
Microsoft Research
0.5030✗
no manifold solid produced
Claude Opus 4.7 → OpenSCAD
Claude Opus 4.7 → OpenSCAD
Anthropic + OpenSCAD 2024.06
—18✗
no manifold solid produced
Spline AI
Spline AI
Spline.design
—2✗
Each tile is rebuilt from the canonical parametric description and degraded to match the agent's scored profile (tessellation, non-manifold face removal, dimension scale jitter, missing features). Image-only diffusion models render visually plausible meshes but score in the single digits on BREP fidelity — the geometry is not a manifold solid even when the render reads clean.
§5Per-agent metrics
ranked by Vol IoU · same data as the leaderboard, restricted to this task
| Agent | Vol IoU | Bidirectional Chamfer | Watert. | Manif. | P@1 | p50 | latency | cost |
|---|---|---|---|---|---|---|---|---|
| Human Baseline (Mech-E) | 0.951 | 0.126 | ✓ | 0.984 | 1.000 | — | 686.8s | $7.062 |
| Zoo Text-to-CAD | 0.815 | 0.111 | ✓ | 0.967 | 0.000 | — | 4.9s | $0.152 |
| DeepCAD | 0.742 | 0.136 | ✓ | 0.957 | 0.000 | — | 3.6s | $0.022 |
| Claude Opus 4.7 → CadQuery | 0.652 | 0.136 | ✓ | 0.946 | 0.000 | — | 29.0s | $0.312 |
| Adam (CADcrush) | 0.627 | 0.147 | ✓ | 0.948 | 0.000 | — | 9.4s | $0.258 |
| GPT-5 → CadQuery | 0.578 | 0.137 | ✓ | 0.940 | 0.000 | — | 30.6s | $0.199 |
| Gemini 2.5 Pro → OpenSCAD | 0.539 | 0.145 | ✓ | 0.935 | 0.000 | — | 28.6s | $0.079 |
| Trellis 3D | 0.503 | 0.155 | ✓ | 0.932 | 0.000 | — | 14.0s | $0.041 |
| Claude Opus 4.7 → OpenSCAD kernel error: BRepCheck_NotClosed | 0.000 | — | × | 0.000 | 0.000 | — | 34.0s | $0.250 |
| Spline AI kernel error: BRepCheck_NotClosed | 0.000 | — | × | 0.000 | 0.000 | — | 7.9s | $0.048 |