Importing and Exporting Geometry
Essentially, three data types make up a 3D model: curves (or wires), surfaces, and solids. Wire frame models composed of only curves lack volume but have a size and shape. A surface model, on the other hand, is composed of curves that define the surfaces. A solid model is composed of curves that define surfaces that in turn define the solid. Understanding the hierarchy of geometry data will help you understand the issues that can occur when translating from one of these data types to another.
There are different ways in which wires and curves are defined. If you are translating files that represent wires and curves as Non-Uniform Rational B-Splines (NURBS) to a format that represents wires and curves as simpler ...
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