Wires
A wire is a connected collection of edges that are not attached to faces and do not enclose any volume. Wires may represent abstract items like profiles, construction lines and center lines, or idealizations of rod or beam-like objects or internal passages. They are also commonly used to form wire frames to be surfaced to form solid-bounding shells.
Figure. Wire Body
A shell may contain a single wire or faces with multiple wires attached to them at vertices. A shell with just a wire is called a wire shell, a lump with only a wire shell is a wire lump, and a body with only wire lumps is a wire body.
Each wire is classified as being exterior representing an infinitesimally thin piece of material, or interior representing an infinitesimally thin passageway within bulk material.
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