Abstract: In the collaborative application of building information modeling (BIM) technology, 2D drawing information plays a significant role in establishing the spatial layout of the modeling and representing the size information of components. In addition the representation of 2D dimension information based on IFC standard overcomes the difficulty that the dimension annotation for 3D models of different industries cannot be conducted using an integrated BIM software tool. In order to examine the space layout and size information of BIM components in a more efficient way, this paper proposes a method to automatically generate 2D dimension annotations for 3D models based on IFC standard. Firstly, the extraction, classification, transformation and storage mechanism of geometric and spatial position information for building components on the same floor is developed. Secondly, the dimension information of all annotated components in the floor is obtained. Then, combined with the space orientation and shape representation of annotated entities based on IFC standard, 2D dimension annotated entities are established and linked with the annotated components. Finally, the proposed method is verified with a two-story building case.

Key words: IFC standard, 2D drawing, BIM technology, dimension marking, automatic generation