When objects are made up of a set number of polygons, the computer usually has to draw them all regardless of whether the object is right up front or a mile away.

ECONOMIST: Smooth operator | The

When objects are described with mathematically defined curves, however, the computer can decide how many polygons to draw, depending on how far away the object is meant to be.

ECONOMIST: Smooth operator | The

You just draw a sketch on a computer or tablet, click print, and the attached printer turns it into a 3D object.

FORBES: My Kindergartner Can 3D Print. So Can Yours.