Module extrude 

Linear extrusion of a triangulated profile into a closed solid.

The result must be watertight and outward-oriented, because that is exactly what axiolid-mesh-boolean-boolmesh demands of its inputs. Getting the winding wrong here produces a mesh that looks valid and computes wrong booleans – the failure mode that has already cost two debugging sessions.

A direction in the profile plane (#281)

An offset with no component along the profile normal bounds no volume: its “solid” is a sliver, or flat at exactly z = 0. The exact path refuses an offset within tolerance of the plane, |o.z| <= tolerance, as "extrusion direction in the profile plane", and so does extrude_profile, by the same typed refusal, so the two paths agree on what they build. extrude carries no tolerance, so it refuses only an offset exactly in the plane, by the same name.

Functions

extrude

Extrude a triangulated 2D profile along direction by depth.

extrude_profile

Triangulate rings and extrude them in one step.

extrude_profile_exact

Extrude a supported profile into an exact, closed analytic B-rep.

outward_orientation

Whether a closed mesh is outward-oriented.