Research And Application Of 3D Visualization Of Tunnel Construction Scenarios Based On Cesium

With the continuous development of the economy and the continuous enhancement of comprehensive national strength,China's transportation industry has ushered in unprecedented prosperity.As an engineering structure on the transportation line,the tunnel has a small impact on the environment and overcomes the terrain and obstacles,so it can reduce the curve design,shorten the mileage,optimize the traffic organization,and thus is widely used in various places.However,as a concealed project,the tunnel has great uncertainty and high risk due to complex geological and hydrological conditions.With the development of computer technology,the application of 3D visualization technology is more and more extensive.Because of its unique visual experience,3D visualization technology can not only help the circulation of information,but also its intuitiveness and overallity can help people to carry out their work more creatively.Based on the 3D earth engine Cesium,this paper conducts targeted research on the 3D visualization of tunnel construction scenarios,which reduces the difficulty of construction site information acquisition and transmission,improves the efficiency of managers,and is of great significance for the successfully construction of the project.The main research contents are as follows:?Review relevant information and conduct analysis and induction.Summarize the shortcomings of 3D visualization in the tunnel field at present,analyze and evaluate Cesium and related technical characteristics,and point out the advantages of the combination of the two and the problems that need to be overcome.?Propose a component loading method suitable for tunnel construction scenarios.Aiming at the large number of components in the tunnel construction scenarios,the modeling workload is large.The 3D loading of components is carried out by using Cesium parametric rendering combined with 3D model loading to achieve a balance between efficiency and effect.At the same time,a local coordinate creation and conversion method is proposed to solve the problem that the Cesium default geographic coordinate system is not suitable for tunnel construction scenarios loading.?Propose a 3D interaction method suitable for tunnel construction scenarios.Starting from the actual situation of the tunnel construction site,the main interaction requirements are sorted out,and functions such as scenarios roaming,file uploading,component selection,and attribute editing are realized.And give an application case listing these functions.?Design and develop a 3D visualization system for tunnel construction.The 3D visualization system of tunnel construction is discussed from the aspects of system requirements analysis,development environment,technical architecture and functional modules,and a suitable solution is proposed.Research on the component data in the system,propose the data structure suitable for the tunnel construction components,and ensure the flexibility and scalability of the system.Finally,the system was initially applied to the tunnel construction site,which achieved good results and had a good application prospect.