Onshape FeatureScript Generator

Quick Start

Analyze request → Match pattern → Gen FS code → Validate logic.

Core Workflow:

1. Precondition: Enums/lengths/reals w/ bounds.
2. Body: Sketches → Extrudes → Booleans → Shell → Wrap/Thicken labels.
3. Pitfalls: qOwnedByBody(finalBody), if/else (no ternary lengths), cylinder(coordSystem).

Key Patterns (Memorize)

• Enum + Cond Param:

```

export enum AlignmentStyle { Centered, Tangent, Offset };

if (definition.alignment == AlignmentStyle.Offset) { isLength(def.offsetDistance...); }

```

• Safe Shell Caps:

```

var capFaces = qFacesParallelToDirection(qOwnedByBody(finalBody, EntityType.FACE), vector(0,1,0));

```

• Union Primary First:

```

qUnion([qCreatedBy(id+"inlet", EntityType.BODY), ...]);

```

• Wrapped Label: skText → opWrap → opThicken.

Dust Fittings Lib

Z-axis: Inlet Z=0 (-Z), Outlet Z=trans (+Z), Branch +X.

See FITTINGS.md for full spec/pitfalls.

Resources

• API Patterns: PATTERNS.md
• Fonts: AllertaStencil-Regular.ttf for labels.
• Validate: Test mentally; no runtime here.

Gen code → User pastes to Onshape FS editor.