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Loft

loft() creates a smooth transition between two or more sketch profiles on different planes. It's useful for shapes that change cross-section along their length.

import { sketch, loft, plane } from 'fluidcad/core';
import { circle, rect } from 'fluidcad/core';

const s1 = sketch("xy", () => {
    circle(100)
})

const s2 = sketch(plane("xy", { offset: 100 }), () => {
    rect(80).centered()
})

loft(s1, s2)

Loft from circle to square

Multiple profiles​

You can loft through more than two profiles:

import { sketch, loft, plane } from 'fluidcad/core';
import { circle, rect } from 'fluidcad/core';

const s1 = sketch("xy", () => { circle(100) })
const s2 = sketch(plane("xy", { offset: 50 }), () => { rect(60).centered() })
const s3 = sketch(plane("xy", { offset: 100 }), () => { circle(40) })

loft(s1, s2, s3)

Three-profile loft

The profiles must be on different planes (typically parallel planes at different offsets).

Thin loft​

.thin() offsets the profile edges on each section to produce a thin-walled shell instead of a filled loft:

import { sketch, loft, plane } from 'fluidcad/core';
import { circle, rect } from 'fluidcad/core';

const s1 = sketch("xy", () => {
    circle(100)
})

const s2 = sketch(plane("xy", { offset: 100 }), () => {
    rect(80).centered()
})

loft(s1, s2).thin(5)

Thin loft

loft(s1, s2).thin(5)     // 5 units outward
loft(s1, s2).thin(-5)    // 5 units inward
loft(s1, s2).thin(5, -3) // dual offset

All profiles must be sketches with matching topology (same number of wires).

Accessing geometry​

const l = loft(s1, s2)

l.endFaces()       // face at the last profile
l.startFaces()     // face at the first profile
l.sideFaces()      // the transition surface(s)
l.endEdges()       // edges at the last profile
l.startEdges()     // edges at the first profile
l.sideEdges()      // edges along the sides
l.internalFaces()  // inner wall face(s) of a thin loft (closed profiles)
l.capFaces()       // cap face(s) of a thin loft (open profiles)

Fusion scope​

loft(s1, s2).new()             // create a separate solid
loft(s1, s2).add()             // fuse with touching solids (default)
loft(s1, s2).remove()          // subtract from all intersecting solids
loft(s1, s2).remove().scope(box)  // subtract only from the box