This Chapter provides an overview of the BIM technology include the history of how the technology developed, what is the very basic technology of solid modeling and what is the difference between today’s BIM software.
The basic concept of modeling is to build up a 3D model by 2D shapes. Boundary Representation (B-reps) and Constructive Solid Geometry (CSG) are two techniques used in solid modeling. The difference between them is B-rep stored the result of the definition as a set of objectives while CGS stored an algebraic formula to define the shape. Today all the modeling tools are incorporate these two technologies to build up the 3D model.
BIM platforms
Scalability is the ability to handle large project scale which contains a high level of detail. It requires the platform can always response no matter how much 3D model the project includes. This ability is critical when the platform need to manage hierarchical parameters. Normally scalability is limited by the operating system. BIM element library has various objects that can be imported for use. These can be very convenient and helpful. Extensibility capabilities are assessed based on weather this platform has scripting languages for user who need specialized functions.
This chapter also listed some different BIM platforms to compare in three aspects, as a tool, as a platform and as an environment. I will mainly compare Revit and Bentley in this post. Revit Architecture is the best known and the current leader software in Architecture BIM modeling field. It is easy to use with many hints and menus are perfectly organized. The generation support makes the drawing easy to manage and edit. Revit has a very large set of object library which can directly import into the drawing. It also has the larges set of associated applications. But the weakness is obvious which is Revit is an in-memory system, it will slow down dramatically when the file exceeds 300MB.
Next software is Bentley Systems. It provides a wide range of products for Architecture, Construction and Engineering etc. As a BIM tool, Bentley has a standard set of parametric objects. It also support user to create their own parametric objects. As a platform, all actions of Bentley are written to a file immediately, which means it occupies lower computer memory. The strength of Bentley is it can deal with almost all aspects of the AEC industry and very complex models like with curved surfaces. While the weakness is it takes more time to navigate.
Reference
Eastman, C. M. (2011). BIM Handbook : A Guide to Building Information Modeling for Owners, Managers, Designers, Engineers and Contractors. Hoboken, NJ: Wiley.
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