| Coal is the most dominant energy source in China and making up about 70% of total primary energy consumption in the country. With the deepening and accelerating the economic reform, the current state of human waves will be replaced by the modern management and production technology in Coal Mine.As the most important spatial feature of coal, tunnel occupies very important position in Digital Mining (DM) in which 3D visualization of coal tunnel is the special application. If people can model the coal tunnel with 3D visualization, they will get the 3D graphics of tunnel and realize the digital and visualization of mining activities firstly; and secondly note and show the engineering changes in time and exactly; thirdly show the spatial relationships of excavation engineering and orebody, wall rock and even the surface diggings; finally improve the management and efficiency and also can improve mine design of safety and environmental. So 3D visualization of coal tunnel has great significance in mining Design and ConstructionIn this paper, the author analyses the study status of tunnel 3D visualization at home and abroad firstly, then combine with the characteristic of tunnel data and the principle of choosing the 3D data model the author put forward some data structures about node and body of tunnel.After described the theory of 3D visualization in detail, the paper compares the advantage and disadvantage of Visual C# with some other computer languages and also contrast the difference of DirectX and OpenGL and finally the author decides to use Visual C# 2005 and DirectX to establish the system of 3D visualization of tunnel according to the idea of 3D games.Take the tunnel data of Dongtan mine of Shandong for example, the author designs the system architecture of the model of 3D visualization of tunnel and also sets up this system successfully which contains follows function:(1) Accepted loading and managing the tunnel data like Add, Delete, View, or Modify.(2) Realized modeling the 3D tunnel order by the process of point→line→face→single tunnel→multi→tunnel.(3) Solved the problem of the join the tunnel at the junction.(4) Combined with the technology of texture mapping and light which contains directional light and spot light people will be personally on the scene of the tunnel 3D visualization.(5) Some visualization analyses like zoom in, zoom out, translation, rotation, roam in outsider or inner the tunnel, changing texture etc.(6) Can switch from analyzing the whole tunnel to roaming in the inner of tunnel or reverse freely, uses can decide to which features will be showing by single or together: Mid-line of tunnel, Tunnel name, 3D tunnel, View position, Roaming in tunnel and Data information.(7) Roaming in the inner of tunnel mainly is along with the midline of it, in this process people can know the view position exactly, not only this the user also can advance, back up or switch to other tunnel, in addition this system can realize some simple function of collision detection.(8) Through export the satisfying graphic, people can save and put it on records.
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