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: text

  export enum AlignmentStyle { Centered, Tangent, Offset };
  if (definition.alignment == AlignmentStyle.Offset) { isLength(def.offsetDistance...); }
  
  

• Safe Shell Caps: text

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

• Union Primary First: text

  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.