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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 number and relationships with other objects. How an object updates itself as its contextchanges is called its behavior. The system-provided object classes predefine what is a wall, slab, or roof in terms of how they interact with other objects.Companies should have the capability of developing user-defi nedparametric objects—both new ones and extensions of existing ones—and corporateobject libraries for customized features and to establish their own bestpractices. Object attributes are needed to interface with analyses, cost estimations,and other applications, but these attributes must fi rst be defi ned by thefi rm or user.of object instances, with forms that vary, depending on the current parameters
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