Surface and Path Signatures

extrude

• signature: extrude profile distance
• result: Solid
• backend keyword:
• :symmetric boolean

revolve

• signature: revolve profile angle
• result: Solid

loft

• signature: loft distance profile1 profile2 ...
• requires at least two profiles after distance
• result: Solid

sweep

• signature: sweep profile path
• result: Solid

Example:

(model
  (part rail
    (sweep
      (circle 1.2)
      (bezier-path ((0 0 0) (0 0 12) (12 0 20) (24 0 20))))))

The circle is the cross-section. The Bézier path carries it upward, then through the bend, producing a capped solid rail.

shell

• signature: shell thickness solid
• result: Solid
• optional keyword:
• :faces selector

offset

• signature: offset amount profile
• result: Sketch
• optional keyword:
• :openings sketch-or-sketch-list

offset-rounded

• signature: offset-rounded amount profile
• result: Sketch
• optional keyword:
• :openings sketch-or-sketch-list

fillet

• signature: fillet radius solid
• result: Solid
• optional keyword:
• :edges selector

chamfer

• signature: chamfer distance solid
• result: Solid
• optional keyword:
• :edges selector

taper

• signature: taper height scale profile
• signature: taper height scale-x scale-y profile
• result: Solid
• FreeCAD caveat: non-uniform taper currently rejected

twist

• signature: twist height angle profile
• result: Solid
• verifier-backed form is 3 positional args

path

• signature: path point1 point2 ...
• signature: path point-list
• each point is 3D
• result: Path

polyline

• alias of path

bezier-path

• signature: bezier-path point-list
• point list must be 3D
• result: Path

bspline

• signature: bspline point-list
• optional second positional in lowerers: closed
• optional keywords:
• :closed boolean
• :tangents point-list
• :tangent-scalars numeric list
• result: Sketch

Notes:

• verifier only requires point-list first
• lowerers accept tangent hints
• tangents list may use 2 entries or one per point in native path

Example:

(model
  (part body
    (extrude
      (bspline
        ((-14 -8) (-8 -14) (8 -14) (14 -8)
         (14 8) (8 14) (-8 14) (-14 8))
        :closed #t)
      4)))