modeling-app/docs/kcl-std/loft.md

title, subtitle, excerpt, layout

title	subtitle	excerpt	layout
loft	Function in std::sketch	Create a 3D surface or solid by interpolating between two or more sketches.	manual

Create a 3D surface or solid by interpolating between two or more sketches.

loft(
  @sketches: [Sketch],
  vDegree: number,
  bezApproximateRational: bool,
  baseCurveIndex?: number,
  tolerance?: number,
  tagStart?: TagDeclarator,
  tagEnd?: TagDeclarator,
): Solid

The sketches need to closed and on the same plane.

Arguments

Name	Type	Description	Required
sketches	[Sketch]	Which sketches to loft. Must include at least 2 sketches.	Yes
vDegree	number	Degree of the interpolation. Must be greater than zero. For example, use 2 for quadratic, or 3 for cubic interpolation in the V direction. This defaults to 2, if not specified.	Yes
bezApproximateRational	bool	Attempt to approximate rational curves (such as arcs) using a bezier. This will remove banding around interpolations between arcs and non-arcs. It may produce errors in other scenarios Over time, this field won't be necessary.	Yes
baseCurveIndex	number	This can be set to override the automatically determined topological base curve, which is usually the first section encountered.	No
tolerance	number	Tolerance for the loft operation.	No
tagStart	TagDeclarator	A named tag for the face at the start of the loft, i.e. the original sketch	No
tagEnd	TagDeclarator	A named tag for the face at the end of the loft, i.e. the last sketch	No

Returns

Solid - A solid is a collection of extruded surfaces.

Examples

// Loft a square and a triangle.
squareSketch = startSketchOn(XY)
  |> startProfile(at = [-100, 200])
  |> line(end = [200, 0])
  |> line(end = [0, -200])
  |> line(end = [-200, 0])
  |> line(endAbsolute = [profileStartX(%), profileStartY(%)])
  |> close()

triangleSketch = startSketchOn(offsetPlane(XY, offset = 75))
  |> startProfile(at = [0, 125])
  |> line(end = [-15, -30])
  |> line(end = [30, 0])
  |> line(endAbsolute = [profileStartX(%), profileStartY(%)])
  |> close()

loft([triangleSketch, squareSketch])

// Loft a square, a circle, and another circle.
squareSketch = startSketchOn(XY)
  |> startProfile(at = [-100, 200])
  |> line(end = [200, 0])
  |> line(end = [0, -200])
  |> line(end = [-200, 0])
  |> line(endAbsolute = [profileStartX(%), profileStartY(%)])
  |> close()

circleSketch0 = startSketchOn(offsetPlane(XY, offset = 75))
  |> circle(center = [0, 100], radius = 50)

circleSketch1 = startSketchOn(offsetPlane(XY, offset = 150))
  |> circle(center = [0, 100], radius = 20)

loft([
  squareSketch,
  circleSketch0,
  circleSketch1
])

// Loft a square, a circle, and another circle with options.
squareSketch = startSketchOn(XY)
  |> startProfile(at = [-100, 200])
  |> line(end = [200, 0])
  |> line(end = [0, -200])
  |> line(end = [-200, 0])
  |> line(endAbsolute = [profileStartX(%), profileStartY(%)])
  |> close()

circleSketch0 = startSketchOn(offsetPlane(XY, offset = 75))
  |> circle(center = [0, 100], radius = 50)

circleSketch1 = startSketchOn(offsetPlane(XY, offset = 150))
  |> circle(center = [0, 100], radius = 20)

loft(
  [
    squareSketch,
    circleSketch0,
    circleSketch1
  ],
  baseCurveIndex = 0,
  bezApproximateRational = false,
  tolerance = 0.000001,
  vDegree = 2,
)