Research On Constructing 3D Scene Technology By Using 2D Graphic Information

In recent years, build designer have already more and more used computer to design the building drawing sheet with some softwares, for example AutoCAD. But the traditional 2D building drawing sheet can not be satisfied with the optesthesia needs by people. So,Virtual Reality research have got fast development, the software about scanning in the 3D scene is increased very quickly and the form of image which the software can integrate and show is more and more. Along with the DirectX is extensively applied in the researching of virtual reality, using .X file by converted from various 2D or 3D file formats to 3D scene which is used by DirectX already become the new research direction. As a result, the technology of reconstructing 3D building model is this paper's main studying content.This paper studies two problems in reconstructing 3D building model: one is recognition of building drawing sheet, which is reading the information form 2D building drawing sheet to reconstruct 3D building model. The other is reconstructing the building structure, which is reconstructing 3D building model corresponding to 2D information in 3D scene. Against these two problems, this paper studies in reconstructing 3D building model from 2D building drawing sheet, includes three aspects. First, there is analyseing AutoCAD's format of DXF file and gaining the useful basic primitive information. Then, on the base of analyseing the new building drawing standard, the form line of building,window and door are distinguished by using features recognition. Third, drawing 3D building model by using mesh function, which is based on the information of building's form line. And inserting the model of window and door in 3D building model basis from the location coordinate of window and door, in order to reconstruct the whole 3D building model. At the same time, 3D building model is saved to .X file. Another function is converting 2D primitives to mesh and saving this mesh to .X file, in order to change format of DXF file to .X file. Verifed after the experiment, this technology of changing format of DXF file to .X file is feasible,applied and advanced which is suggested by the system. And the precept of 3D building model reconstructed by 2D building drawing sheet is also feasible.