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Freeform surface modelling is a technique for engineering freeform surfaces with a CAD or CAID system.
The technology has encompassed two main fields. Either creating aesthetic surfaces that also perform a function; for example, car bodies and consumer product outer forms, or technical surfaces for components such as gas turbine blades and other fluid dynamic engineering components.
CAD software packages use two basic methods for the creation of surfaces. The first begins with construction curves from which the 3D surface is then swept or meshed through.
The second method is direct creation of the surface with manipulation of the surface poles/control points.
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