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Shell

shell() hollows out a solid, leaving walls of a specified thickness. You pick which face(s) to remove — these become the opening.

import { select } from 'fluidcad/core';
import { face } from 'fluidcad/filters';

cylinder(50, 100)

select(face().circle())        // select the top circular face

shell(-5)                      // hollow out with 5-unit thick walls

Thickness direction​

The sign of the thickness controls which way the walls go:

  • Negative (e.g. -5): shell inward — the outer shape stays the same
  • Positive (e.g. 5): shell outward — the inner cavity stays the same

Passing faces directly​

Instead of using select(), you can pass faces as additional arguments:

const e = extrude(30)
shell(-3, e.endFaces())        // remove top face, hollow the rest

You can remove multiple faces at once:

shell(-3, e.endFaces(), e.startFaces())   // open on top and bottom

Accessing geometry​

const s = shell(-3, e.endFaces())

s.internalFaces()      // the inner wall faces
s.internalEdges()      // edges on the inner walls