关键词: 建筑信息模型（BIM）, 数据分块, 墙体轮廓提取, 三维重建

Abstract: BIM (building information modeling) technology development is regarded as the second revolution in the construction industry, to build 3D building information model is the first step of the BIM application. However, the efficiency of BIM in manual is low. Therefore, this paper combines AutoCAD and secondary development technology of Revit to achieve 3D reconstruction based on floor plan. In the process of reconstruction, the first step, extracting data on floor plan, studying recognition method of important building components, that is the recognition of the straight wall, the window and the door. Then on the base of these, using the idea of data block, this paper proposes an adaptive block contour extraction algorithm of the wall, which solves the problem that the wall segment is disconnected, extracts effectively the contour of the wall and the coordinate points, achieves 3D reconstruction of walls, doors and windows, and improves BIM modeling efficiency.

Key words: building information modeling (BIM), data block, contour of the wall, 3D reconstruction