| Virtual reality(VR)is the key to the realization of human-machine-object interconnection.The use of virtual environments to support high-speed railway construction and refined management is an important current development trend.It is of great significance to the development of railway intelligence.However,existing high-speed railway VR scenes often have problems of low fusion efficiency and low rendering efficiency,which is difficult to meet the needs of high-fidelity display and efficient interactive analysis of long-range large-scale high-speed railways.Aiming at the above problems,this paper conducts research on key technologies for high-speed railway VR scene fusion modeling and real-time rendering optimization,selects case areas,develops prototype systems,and conducts experimental analysis.The main research work and results of this paper are as follows:(1)A dynamic fusion modeling method for high-speed railway VR scene is proposed.First,the principle of geographic scene fusion method is introduced,on the basis of which a comparative analysis is performed.Then,the general idea of dynamic fusion of high-speed railway scenes is given.Then the terrain scene construction based on the height map and the high-speed rail scene modeling are realized under space constraints,and the terrain and feature fusion modeling is realized.Finally,a calculation algorithm for the intersection of the tunnel entrance and the terrain is designed,and a dynamic fusion display of the tunnel entrance and the terrain based on the stencil testing is realized.(2)An optimization method for VR scene organization and rendering for highspeed railway is proposed.First,the octree method is used to organize the terrain scene data,and the bounding box detection technology is used to establish a view cone-based terrain scheduling method.Secondly,a multi-level model of high-speed railway scene is constructed,and the railway model is organized in sections.Finally,a dynamic loading method of the model based on VR ray collision detection is designed to optimize the rendering of the scene objects to achieve applications such as multi-modal browsing interaction and query analysis.(3)Developed a prototype system and conducted the test case analysis.Based on software and hardware devices such as Unity3 D,Visual Studio 2018,HTC VIVE,and Dell graphics workstation,this paper developed a prototype system,and selected a high-speed railway section as a case area for experimental analysis.The results show that the method of the paper can support high-speed railway VR scene dynamic fusion modeling.The overall modeling time of 100 km high-speed railway VR scene is about500 s,and the average rendering efficiency is above 90 frames/s.This method can meet the real-time rendering requirements and can effectively support users an immersive tour and interactive analysis of railway VR scenes. |
