New method of 3D reconstruction from mechanical engineering drawings based on engineering semantics understanding

3D reconstruction from mechanical engineering drawings is a method of automatic generating 3D solid models. For the purpose of enhancing the practicability of the technique of 3D reconstruction, this paper presents a new reconstruction method based on engineering semantics understanding. Its principle is similar to the method of figuration analysis used by experienced engineers. The characteristic of the new method is as follows: First, engineering semantics understanding is used to accelerate feature recognition of components or primitives. Second, a mechanism of supposing and ascertaining for 3D reconstruction is set up and views testing are adopted to validate the result solid. Third, integrated reconstruction techniques are used to enlarge the figuration domain of reconstructed objects. Last, case-based reasoning is used to establish a self-learning mechanism of primitive feature recognition. It is implemented at the desktop of AutoCAD 2004 by using Object ARX 2002 and VC++6.0. Experimental results show that some improvements are gained by using the new algorithm on the aspect of utility scope and processing speed of reconstruction.