Driving Visual Simulation Of Urban Rail Transit Based On IOS

Visual simulation technology has been a hot research topic in the field of computer simulation.With the intelligent and popularization of mobile devices,it provides a broad platform for visual simulation technology.The construction of urban rail transit in our country is in the accelerating stage,and the demand for train drivers in the first line is increasing year by year.In view of the objective characteristics such as high cost,long training period and time is not flexible for train drivers.The author using the visual simulation technology and Unity3D tools to develop the train driving visual simulation system based on virtual city environment.And then transplanted the application to the iPhone mobile terminal,to reduce the training costs,shorten the training period.The specific work is as follows:1.The simulation of the train operation had been realized,which mainly includes the running path of the train on the basis of the Bessel curve,through the algorithm can make the train run smoothly follow the established path,as well as has the function of acceleration,deceleration and emergency braking through the human-computer interaction.At the same time,in order to simulate the driver's driving,the simulation view locked at the driving angle.2.On the basis of the train operation,in view of the limitation of the hardware performance of the mobile platform,this paper makes some optimization work.Including use the octree algorithm to realize the dispatching for scene model in the process of the train running,and realize the function of dynamic loading and uninstalling for scene model by triggering the instruction when the train pass through the fixed point which on the path.In addition,makes some further optimization work by using the occlusion culling function of Unity3D and the hierarchical visual culling algorithm.3.The visual effects in the process of train running had been realized.Including used the per-pixel lighting to realize the effect of daytime lighting.According to the characteristics of train running this paper analyzed the particle's properties of position,movement and life to realize the effect of particle rendering under the condition of occlusion.Then used the effect to realize the weather change.4.This paper did some research about the steps of how to become an iOS developer,after it,release the project on the iOS platform through the packaging settings in the Unity3D.And then do some device tests about FPS,memory and power consumption to test the final simulation results.Finally,analysis of the relevant reasons combined with the data.