extrudo

API docs

Shell

d.shell(inputs, options?): FeatureHandle<'shell'>

One feature of the timeline, in the modify category. Its name follows the app's (Shell1, then Shell2, …); options.name gives it another, options.id its ID and options.index its place in the timeline. Inputs the table calls optional keep the default it names, so a call with none of them still makes a valid feature.

Inputs

Input Type Required or default What it does
faces GeomRef | GeomRef[] (face) optional The faces to remove (openings). Without any, the bodies are hollowed closed.
bodies GeomRef | GeomRef[] (body) optional The bodies to hollow closed, besides the bodies of the faces.
thickness string | number | ParameterHandle required The wall thickness; a length.
direction 'inside' | 'outside' default inside Hollow inside the bodies or outside them.

Faces

Role What it is
inner:<face> The face of the wall itself, on the side away from the outer skin (an inside shell hollows in).
rim:<face> The rim round an opening, between the removed face and the inner face.
round:<face> The round on a face that meets the one removed at an angle.
new A face with no face of its own before, which nothing else names.

handle.face(role) builds a reference to one of them and handle.faceName(role) its persistent name. A <…> is what varies: a side:<sketch curve> is the wall of the curve you pass, and a role of a face that no face carries takes that part out. A role this feature never names is a lost reference — a visible error, never a silent guess.

Example

import { Design, type LineHandle } from '@extrudo/api';

const d = Design.create({ name: 'My part' });

// Two solids to point faces, edges and bodies at.
const plate = d.box({ length: '40 mm', width: '20 mm', height: '10 mm' });
const shaft = d.cylinder({ diameter: '20 mm', height: '20 mm' });

// A sketch with two closed profiles, a hole and a guide line beside them.
let guide!: LineHandle;
const s = d.sketch(d.origin.xy, (k) => {
  k.rectangle([0, 0], [40, 20]);
  k.circle([10, 10], '3 mm');
  k.rectangle([50, 0], [60, 10]);
  guide = k.line([-5, 30], [45, 30]);
});

const profile = s.profileAt([1, 1]);
const sections = s.profiles();
const line = guide.ref();
const face = plate.face('side:front');
const edge = plate.edge([plate.faceName('side:front'), plate.faceName('side:right')]);
const vertex = plate.vertex([plate.faceName('side:front'), plate.faceName('side:right')]);
const corner = plate.vertex([plate.faceName('side:front'), plate.faceName('side:left')]);
const body = plate.body();
const step = 'att-part.step'; // an attachment of the design
const plan = 'att-plan.png';

// Shell.
d.shell({ faces: face, thickness: '2 mm' });

See also