Research On 3D Dynamic Visualization Method Of Landslide Based On Game Engine

Landslide disasters are the most frequently occurring geological disasters in my country.They are often sudden,destructive,and difficult to predict,causing serious casualties and property losses in disaster-stricken areas.In recent years,landslide research has gradually developed towards quantitative research and interdisciplinary integration.Using scientific means to conduct three-dimensional dynamic visualization simulation of landslide disasters is conducive to vividly,scientifically and efficiently restoring the process of disasters,and provides scientific basis for disaster analysis.The popularization of disaster prevention and mitigation is of great significance.The existing visualization simulation of landslides is mostly a two-dimensional or three-dimensional static model,which has the problems of insufficient realism and low simulation efficiency.In view of the above two deficiencies,this paper integrates the game engine and builds a set of particle systems based on the The landslide visualization simulation method,LOD technology based on terrain data block and quad-tree structure constructs the disaster geographic scene,and realizes the three-dimensional dynamic visualization of landslide disaster.And the optimization effect of the scheme is verified by optimization experiments,and finally a prototype system is developed to verify the effectiveness and feasibility of the method and optimization scheme,which has important application value for popularization of popular science.The research work of this paper includes the following four aspects:(1)3D dynamic visualization of landslide disastersThe three-dimensional dynamic visualization of landslide disaster includes two parts:the three-dimensional visualization of landslide evolution process and the construction of the geographical scene of the disaster area.Integrate the game engine,and study the key methods of the two parts respectively.According to the fluidization theory of high-speed long-distance landslides,the abstract fluid motion process is described by the Navier-Stokes equation of incompressible fluids,and the landslide simulation methods-SPH,PBF and visual rendering are selected for analysis.Method — — Screen space rendering method,based on the particle system to build a visual simulation process,by defining the input parameters,a method of landslide feature information extraction and constraint modeling is proposed to complete the extraction and input of parameters,and the three-dimensional dynamic visualization of the landslide evolution process is obtained through calculation.Simulate the time series results;finally,based on the terrain block organization and the LOD technology of the quad-tree structure,the disaster area geographic scene is constructed,and the time series results of the visualization simulation are dynamically superimposed to the disaster area scene to complete the three-dimensional dynamic visualization of the landslide.(2)Landslide visualization optimization and experimental analysisAiming at the contradiction between the limitations of computer conditions and the existing research results,from the perspective of improving the authenticity of visual and boundary interaction,and starting from the selection of simulation algorithms and parameter tuning to improve efficiency,a set of landslide visualization optimization solutions are designed.The key method of visual simulation,the selection of simulation algorithm and the tuning of control parameters are optimized.The experimental research method is used as the main method to verify the effectiveness of the optimization scheme,and further improve the realism and efficiency of visual expression.(3)Prototype system development and visual evaluationA real case of landslide was selected as a prototype,and a prototype system was developed based on the three-dimensional visualization and optimization method of landslide disasters studied in this paper,and the visualization effect of the system was evaluated to verify the feasibility,universality and application value of the method described in this paper.