The Design And Implementation Of Mine Tunnel Splicing And 3D Visualization

The 3D mine tunnel modeling is a key problem of the development of current 3D Geographic Information System(GIS) and theory and technique of the Digital Mine(DM),and, The tunnel splicing modeling is a key problem of the 3D tunnel modeling. Studying the method of tunnel splicing modeling can perfect the method of 3D mine tunnel modeling and the way of modeling about digital mine, promote the development of MGIS theory and method and lay the theory and method foundation on developing practical commercial software.Discussing the establishment of 3D tunnel data modeling firstly, from the results of previous studies, summarizing tunnel data sources and characteristics, studying tunnel network elements and topology, Proposing based on the two-dimensional discrete points loading section of the tunnel centerline method to build 3D tunnel modeling and giving the corresponding data structure. Establish the tunnel database management information systems based of a hierarchical structure, and provide access, editing, processing, storage and other operations of tunnel modeling data, for tunnel modeling and stitching algorithm to provide accurate data interface, reducing tunnel modeling and the complexity of the algorithm Stitching. From the computer-aided geometric design (CAGD) analysis of existing surface stitching algorithm and NURBS with the principle, propose analytic geometry of the tunnel splicing algorithms and models based on discrete points of tunnel stitching algorithm. With examples Focus on discrete points of stitching algorithm key issues, and give concrete solutions.Based on pretreatment of tunnel model data and the analysis of the OpenGL visualization technology, use of object-oriented programming design and programming methods, validate the tunnel modeling and stitching algorithm, and give specific examples of 3D display.