Abstract: Technique of 3D reconstruction based on three orthographic views refers to constructing a corresponding 3D object model by use of the geometric and topological information in the existing 2D engineering drawings. In this paper，a 3D object reconstruction algorithm from three orthographic views of engineering drawings is proposed and implemented, which is based on the information from AutoCAD orthographic views and DXF file format documents. According to the rules of projection, corresponding primitives are matched and recognized, 3D reconstruction is automatically finished by computer. After 2D orthographic views are moved, revolved and extruded, the 3D object model can be reconstructed by making appropriate boolean operations at last.

Key words: computer application, three orthographic views, graphic elements, 3D reconstruction