faces, but are limited by a collectively closed series of boundaries projected to an infinite plane, instead of a surface.

Skins and volumes

As with surfaces, surface faces closed in one or two directions frequently must also be broken into two or more surface faces by the software. To combine them back into a single entity, a skin or volume is created. A skin is an open collection of faces and a volume is a closed set. The constituent faces may have the same support surface or face or may have different supports.

Solids

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