A model is a representation of some features of either a concrete or abstract entity. The purpose of a model is to let people visualize and understand the structure or the behavior of the entity, as well as providing the possibility to experiment and predict the effects of inputs or changes to the model.
Computer aided modeling permits to design 3D shapes that actually resemble real objects. They are manipulated by their geometry, by the mathematical descriptions of the points, lines, and curves by which they are created.
solidThinking uses NURBS (Non Uniform Rational B-Splines) as its geometry type. This curve and surface definition method offers the greatest flexibility and precision. NURBS are capable of representing any desired shape, both analytic and free form entities, and their algorithms are fast and numerically stable. Excellent mathematical and algorithmic properties have contributed to make of NURBS the de-facto industry standard for the representation of geometric information processed by computers.
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