Parametric design involves generating project configurations through scripted programs and adjusting initial calculations to produce design outcomes, enabling design automation. In BIM, parametric design can be divided into two key components: parametric graphics and the parametric modification engine.
Parametric graphic elements refer to BIM components represented graphically, where variations between components are controlled through parameter adjustments. These parameters store all the information about the graphical elements, effectively representing digital building components.
The parametric modification engine uses parameter modification techniques that automatically propagate user changes in building designs or document components to all related elements. The core idea of parametric design is that the system maintains constant parameters automatically while variable parameters change. This allows designers to define design requirements based on engineering and geometric relationships, with the constraints in the parameter model accurately reflecting the designer’s intent. As a result, parametric design significantly accelerates model creation and modification.
Currently, there are various types of parametric design software, which generally fall into two categories, each applied at different stages of design and construction.
Parametric software used during the design phase primarily supports plan analysis and drafting. Examples include Rhinoceros Grasshopper and its related plugins, which use preset logical algorithms for analysis and calculation. Designers control the core logic, enabling the software to actively participate in the design process and display updates in real time.
On the other hand, parametric and BIM software used in construction planning focuses on precision control and construction support. This category includes architectural BIM software such as Revit and ArchiCAD, as well as CAM software that integrates seamlessly with manufacturing and post-processing, like Pro/E. Advanced CAM software like CATIA, widely used in industrial manufacturing, enables designers to create complex nonlinear designs that are difficult to achieve with traditional modeling tools.
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