← DXF to 3D app

LLM benchmark: 2D CAD → 3D model code

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The 2D drawings and what the model produced

Each card is one input drawing (DXF). The three rows are the three prompt strategies; the note explains, from reading the generated OpenSCAD, why a run failed.

Method

• 6 DXF drawings (easy to hard: holes, nested loops, bulge arcs, rectangular windows), each with an extrusion depth.
• 3 prompt strategies: raw-dxf (DXF text), structured (parsed entity JSON), fewshot (structured plus one worked example).
• The model writes OpenSCAD; OpenSCAD renders it to STL; volume and bounding box are compared with ground truth from this app's own DXF pipeline.
• Pass = renders, volume within 5%, bounding box within 2% of the largest dimension. Temperature 0, fixed seed, one run per cell.
• Executed on a GitHub-hosted CPU runner via Ollama. Source: bench/ in the repository.