A 3-DIMENSIONAL BUILDING AUTHORING TOOL BASED ON LINE DRAWING UNDERSTANDING

Recently three-dimensional (3D) graphics has been applied in areas suc h as building and mechanical design, with the help of CAD tools to fir st construct the two-dimensional (2D) and 3D models. Building syntheti c environments usually involves lots of work in constructing virtual r eality worlds, and making authoring more efficient is one of the most important goals in virtual reality. We propose a prototype system that integrates several modules such as image preprocessing, vectorization , editing, and 3D model generation, to transform a 2D architecture des ign diagram into a 3D building model. We also propose an improved meth od that can efficiently recognize slant lines in addition to vertical and horizontal lines. To do this, since a line has a constant slope, w e use back-tracking in our method and utilize a line slope consistency check to prune wrong targets.