pub fn fixed_reference_sweep(
rings: &Rings,
path: &[DVec3],
reference: DVec3,
) -> Result<TriMesh, GeomError>Expand description
Sweep a profile along a sampled directrix with a fixed reference.
The reference direction is held constant, so the profile does not twist with the path’s torsion. That is what distinguishes this from a Frenet sweep, whose frame rotates with the curve’s binormal.