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This chapter provides an overview of the primary technology that distinguishesBIM design applications from earlier generation CAD systems. Object-basedparametric modeling was originally developed in the 1980s for manufacturing.It does not represent objects with fi xed geometry and properties. Rather, itrepresents objects by parameters and rules that determine the geometry as wellas some nongeometric properties and features. The parameters and rules can beexpressions that relate to other objects, thus allowing the objects to automaticallyupdate according to user control or changing contexts. Custom parametricobjects allow for the modeling of complex geometries, which were previouslynot possible or simply impractical. In other industries, companies use parametricmodeling to develop their own object representations and to refl ect corporateknowledge and best practices. In architecture, BIM software companies havepredefi ned a set of base building object classes for users, which may be addedto, modifi ed, or extended. An object class allows for the creation of any numberof object instances, with forms that vary, depending on the current parameters
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