| Based on researching the technology and the design method about the virtual reality technology and the computer graphic modeling ,this paper analyses the relations between these theories and the method and the road traffic driving simulator graphic modeling system, and summarize the driver's correlation requests about the expecting scene image of the driving simulator for road traffic problems primarily, as well as understand the situation of development and the form of data construction to the road traffic driving simulator graphic modeling system detailedly in the author's laboratory (Road Traffic Simulation Laboratory). Finally, the author bring forward the design mentality and the realization method about the system.Because complexity of the urban road interchange ,it is difficulty that the building of the three-dimensional virtual scene. This paper analyses the urban road interchange essential characters, and researches design arithmetic of plan thread and vertical curve ,and bring forward graph modeling method based on the AutoCAD. Using the AutoCAD function of formidable figure and secondary development, creating city road modeling is calculated by uniform centerline modeling integrating vertical section and transect modeling as well as making database which is used by simulator.The system is secondary developed AutoCAD with VB which is inlay in the AutoCAD,and designed menu—urban road interchange graphic modeling system—which is inlay in the AutoCAD too. The system has the good man-machine dialogue design,and has the AutoCAD interface menu management. Its core is choice the correlation parameter according to the prompt and design urban road interchange basic center line(Include: straight line, circular curve, transition curve) in the AutoCAD window, and creat and output the the virtual scene data quickly, and realize to assign automatically the landscapes, such as road traffic facility, traffic marking and sign etc. Software can create city road virtual scene on the basis of AutoCAD's electronic graphic offered by the planning and design unit, and provide coordinates exchange foundation too . In order to carries on the three-dimensional design , the system is allowed to choice the AutoCAD viewport .Through establishment of the research work of which stated in this thesis, I have realized the urban road interchange graphic modeling, and found the applied method of implementation of the secondary development of AutoCAD using VB in the virtual reality technology, and done the urban road interchange graphic modeling system software. All of this have made a good foundation of continuing the research job of the urban road interchange graphic modeling. |
PDF Full Text Request