The Virtual Reality Simulation Method Of Mass Evacuation Of Debris Flow Disaster

In the virtual debris flow disaster scene,the evacuation simulation analysis can provide a reasonable scientific basis for disaster emergency disposal.However,there are some problems in the existing research,such as the single static and low efficiency of visualization,which can not effectively support the virtual reality simulation of large-scale debris flow crowd evacuation in emergency situation.Therefore,this paper focuses on the research of virtual reality simulation method of large-scale debris flow disaster crowd evacuation,and breaks through the key technologies such as virtual debris flow disaster scene construction,real-time evacuation path planning under multiple constraints and large-scale crowd optimization drawing,develops the prototype system and carries out experimental analysis.The main research achievements and specific work in this paper are as follows:(1)The construction method of debris flow disaster scene is put forward.First of all,the thematic information of debris flow disaster scene is extracted,and then the debris flow disaster scene is constructed from terrain scene,debris flow evolution process and disaster information.Finally,the differences of the character object description skeleton-driven character model rendering technology are studied,and the virtual character model is established.(2)A method for real-time planning of crowd evacuation routes with multiple constraints is designed.The classification of the road network,the analysis of road speed and road risk carrying capacity of different grades were carried out,and a data set of disaster environmental elements was constructed.Based on the Dijkstra algorithm,the real-time evolution time of debris flow was used as a constraint,and a crowd evacuation path planning algorithm was designed to realize the real-time optimal path planning from the residential concentration point to the refuge.(3)A large-scale crowd evacuation simulation method based on animation instantiation is proposed.This paper presents the implementation method based on the animation instanced rendering technology,studies the optimization methods such as visibility culling and level of detail,and realizes the large-scale crowd evacuation visualization to ensure the real-time rendering efficiency and real rendering effect of large-scale crowd.(4)Based on the above research results,the prototype system is designed and developed,the case area is selected and the experimental analysis is carried out.The experimental results show that the method can construct virtual debris flow disaster scene,support the real-time dynamic planning of debris flow disaster evacuation path and real-time rendering of large-scale crowd evacuation.