Jerry
43 lines
2.0 KiB
Markdown
43 lines
2.0 KiB
Markdown
# Backend capabilities
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## build123d through CAD Skill
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Use as the default STEP-first backend.
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Best fit:
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- Brackets, connecting rods, cranks, levers, shafts, bushings, flanges, plates, housings, covers, enclosures, fixtures, and machined features.
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- Parametric Python sources with holes, pockets, slots, bosses, ribs, shells, fillets, chamfers, lofts, sweeps, and revolves.
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- Source-level assemblies, named datums, joints, imported components, measurements, alignment checks, and existing STEP inspection.
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- STEP output compiled from executable DesignIR 2.0.
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Weak signals: a specialized mechanical family already implemented by SimpleCADAPI or a browser-only execution requirement.
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## SimpleCADAPI
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Use for its standard mechanical factories and replayable modeling graph.
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Best fit:
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- Spur, helical, and herringbone gears; internal ring gears; racks; cycloidal discs; ball bearings.
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- Planetary and cycloidal reducers, joint actuators, and mechanism-heavy assemblies.
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- Parameter expressions, operation-graph JSON, replay, semantic tags, and topology queries.
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- Reusable mechanical product families whose formulas should become deterministic library functions.
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Before invocation, inspect the installed package and Skill versions together. Do not mix the current single-`Solid` boolean API with older `*rsolidlist` documentation. If the installed runtime and docs disagree, stop that route and use build123d or repair the installation.
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## Router refinement and repair
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Use text-to-cad's own requirement expansion and visual repair when requirements
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are vague, reference images carry important intent, or visual complexity makes
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one-pass generation unreliable:
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1. Refine the request into a measurable brief.
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2. Confirm important fit- or safety-critical unknowns.
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3. Generate and execute backend source.
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4. Validate deterministic geometry facts.
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5. Inspect a multi-view render against the brief.
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6. Repair visual mismatches, capped at three automatic visual rounds.
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CAD Viewer reviews the generated or reconstructed STEP.
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