基于IFC的BIM三维几何建模及模型转换

三维数字技术在建筑工程领域的应用,有效改变了传统的以点、线、面等二维图元组成的工程图纸的信息表达缺陷,是BIM（Building Information Modeling）的重要技术支撑。三维几何模型有多种表达形式,总体上可以分为实体模型、表面模型和线框模型,三者具有不同的应用领域与适用范围。为了满足BIM在建筑工程不同阶段的应用需求,本文基于BIM技术,提出了一种基于AutoCAD图形引擎的BIM三维实体建模以及将其转换为表面模型的方法,并通过实例验证了其可行性。

Methodology of 3D Geometric Modeling and Model Conversion of IFC-based BIM

Contrast to the traditional paper-based information representation methodology which uses 2D graphic primitive elements such as point,line,face etc.,the application of 3D digital technologies in A/E/C（Architecture/Engineering/Construction）domain significantly improves the efficiency of construction information communications and has become a key technical support of BIM（Building Information Modeling）.The various types of 3D geometric representations can be classified into solid model,surface model and framework model,each of which can be applicable in specified application areas and scope.To meet the requirements of BIM applications in different phases of A/E/C,a methodology of 3D solid modeling and converting it into surface model of IFC-based BIM is proposed in this paper,which adopts AutoCAD graphic engine.Its feasibility is verified by some tests.