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With Revit, they’re truly 3D annotations. You don’t need to draw these elements in each view as separate, disconnected graphics. Levels, grids, and section marks extend throughout the model and can be edited from multiple views. These elements (levels, grids, sections) appear in many views thanks to BIM application functionality. Annotations such as sections, levels, and grids are 2D graphics, but they have 3D characteristics and appear in other views.
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Examples include dimensions, tags, callouts, and text notes. Most annotations are view-specific 2D elements and appear only in the view in which they were created. These are listed in the second tab of the Object Styles dialog box. ANNOTATION CATEGORIES Annotation Object categories include all the annotations, symbols, and descriptive data added to a view to describe the building. These object categories include elements such as walls, floors, roofs, and furniture, along with other categories that make sense in an architectural project. MODEL CATEGORIES Model Object categories-the first tab in the Object Styles dialog box-include all the real world types of objects typically found in buildings. This system of organization is based specifically on the AEC industry and is set up to help manage relationships between classes of elements as well as the graphical representation for each class. Figure : Essential categorization of Revit elements Revit uses a classification system to organize all the families in the model. UNDERSTANDING REVIT PARAMETRIC ELEMENTS Every element in Revit is considered a family, and each family belongs to a category. A hierarchical system is used, where a Family tells Revit how to make something, a Type (of a Family) forces certain parameters to be applied, and an Element (or Instance) (of a Type) is the actual part of the building model. There are many Categories of Families, but three main types: System, Component and In-Place Families. Revit uses the term 'family' to describe a discrete definition of a part of the building model. Revit also utilizes its rendering engine to remove the interpretation from complex geometries, allowing more intricate designs to be made and understood. This allows a single model and associated database to be kept, ensuring that all parties have the latest information and that there are no errors in translation. Revit models created in different disciplines (Architectural, Structural, and Mechanical) can be linked and/or combined into one model. BIM intends to replace this approach with a more centralized one. Currently, architects, consultants, general contractors, and manufacturers all create their own models and databases from information handed down in a chain of command. A main function of Revit is to eliminate redundancies such as having multiple models across industries. Revit is intended to be a major component in Building Information Modeling. REVIT MEP, for mechanical, electrical and plumbing engineers (formerly Revit Systems). REVIT STRUCTURE, for structural engineers. Since purchasing Revit, Autodesk has developed three versions of Revit for the varying building design disciplines: REVIT ARCHITECTURE, for architects and building designers (formerly Revit Building). The acquisition meant more research, development and improvement of the software. On February 21, 2002, Autodesk announced plans to acquire Revit Technology Corporation. Revit's intelligent design environment encouraged design revisions because there was real-time synchronization of the documentation. Its technology offered the model concept with an easy-touse platform designed to enable architects, engineers and contractors’ life-cycle planning for building projects. First offered as a software lease, Revit was the first parametric building modeler specifically designed for the AEC industry. In 2000 the company was renamed Revit Technology Corporation and on Apin Cambridge, MA the first version of Revit (1.0) was released.
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HISTORY OF REVIT Individuals from Charles River Software started the development of Revit in year in1997.