---
title: "loft"
excerpt: "Create a 3D surface or solid by interpolating between two or more sketches."
layout: manual
---

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

The sketches need to closed and on the same plane.

```js
loft(sketches: [Sketch], v_degree: NonZeroU32, bez_approximate_rational: bool, base_curve_index?: integer, tolerance?: number) -> Solid
```


### Arguments

| Name | Type | Description | Required |
|----------|------|-------------|----------|
| `sketches` | [`[Sketch]`](/docs/kcl/types/Sketch) | Which sketches to loft. Must include at least 2 sketches. | Yes |
| `v_degree` | `NonZeroU32` | 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 |
| `bez_approximate_rational` | `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 |
| `base_curve_index` | `integer` | 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 |

### Returns

[`Solid`](/docs/kcl/types/Solid) - An solid is a collection of extrude surfaces.


### Examples

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

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

loft([squareSketch, triangleSketch])
```

![Rendered example of loft 0](data:image/png;base64,[encoded data, 145396 characters])

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

circleSketch0 = startSketchOn(offsetPlane('XY', 75))
  |> circle({ center = [0, 100], radius = 50 }, %)

circleSketch1 = startSketchOn(offsetPlane('XY', 150))
  |> circle({ center = [0, 100], radius = 20 }, %)

loft([
  squareSketch,
  circleSketch0,
  circleSketch1
])
```

![Rendered example of loft 1](data:image/png;base64,[encoded data, 183256 characters])

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

circleSketch0 = startSketchOn(offsetPlane('XY', 75))
  |> circle({ center = [0, 100], radius = 50 }, %)

circleSketch1 = startSketchOn(offsetPlane('XY', 150))
  |> circle({ center = [0, 100], radius = 20 }, %)

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

![Rendered example of loft 2](data:image/png;base64,[encoded data, 183256 characters])


