Study On CAD Graphic I/O Interface In 3D Geology Modeling

With the development of computer technology and information industry, CAD (Computer Assistant Design) is widely used in the field of engineering design.However, CAD technology are mainly used in two-dimensional space.In three-dimensional,it is difficult to obtain a wide range of applications as the complexity of the geological structure,or have not yet been widely applied.Based on the above reasons, the purpose of this paper is to develop a three-dimensional geological modeling software system based on AutoCAD powerful graphics and interactive features and graphic output data interface.It focus on resolving the front-end output from AutoCAD to three-dimensional geological modeling system,and the back-end output from three-dimensional geological modeling system to AutoCAD.So,it achieves the extraction of raw data in AutoCAD for the three-dimensional geological modeling system services.At the same time,it carries out the model data dealt by the three-dimensional geological modeling system to output in AutoCAD.For the implement of the front-end input interface and the back-end output interface, main research work in this paper expressed in the following areas:Aimed at the need of geological data in the three-dimensional geological modeling system, the paper introduces direct and indirect methods to extract the data from AutoCAD graphics, and gives the basic ideas and processes of direct extraction method, used ObjectARX managed wrapper classes.It also gives the relevant methods of indirect extraction method. It is a fast and effective way to get geological data.For three-dimensional geological model graphics output problem, the paper studies on the implement of 2D map output in AutoCAD.Effective methods to fill the region with texture automatically and to carry out the back-end output interface from three-dimensional geological modeling system to AutoCAD are studied.These methods are using the data deduced by three-dimensional geological modeling system. Thus, effective using AutoCAD powerful image-editing and texture attributes hatch functions, it achieves intuitive geological information indication of 2D map in AutoCAD, and it is in accord with the habit need of geological experts.