Research Of Polygon Mesh Real-time Reconstruction In Vehicle Driving Simulator Scene

Virtual Environment is an advanced interface, which provides some intuitional and natural perceptive means, such as vision, hearing, feeling, and so on. Users construct a set of realistic models with computer and then create virtual environment with 3D characteristic. With the rapid development of computer technology, virtual reality technology is used in more and more areas. In the meantime, it needs to generate realistic images with good real-time feature.The Vehicle Driving Simulator based on Virtual Reality technology requires good human-machine interface satisfying the need for the features of Immersion, Interaction and Imagination at the same time. So the design and realization of the visual system is very important during the development process of Vehicle Simulator.In the visual system of Vehicle Driving Simulator, the model in the scene usually consists of triangle polygon meshes on the surface. It always contains a huge number of triangle polygons, such as buildings, terrains and etc. These polygons will become the bottleneck of system, lose frames, slow down the speed of visual system and lead to bad effects to the simulating, if the computer is not fast enough.So, the requirement of real time for real time drawing of the visual system in the interactive vehicle Simulator has already become a bottleneck problem need to be resolved.This thesis discussed the theory of polygon mesh modeling, the theory of terrain modeling and Level of Details (LOD) technology typically in the polygon mesh real time reconstruction technologies, in the background of vehicle Simulator development. A method for optimizing the sceneries in the vehicle driving simulator visual system is proposed, which is based on the LOD technology to simplify or complicate the polygon meshes of the sceneries. It divides the sceneries into categories with different optimize strategies and gets a good effect. This method is practical and provides a valuable reference forsimilar visual systems.The method and strategy with real-time continuous LOD technology based on Progressive Mesh in the Virtools Dev for resolving the problem mentioned above is discussed. A LOD behavior Building Block based on the distance between viewpoint and object is developed with the SDK, as a powerful assistance to the integrated LOD technologies in Virtools Dev.A Vehicle Driving Simulator based on the driving hardware system of the racing game is built. It provides an economical, practical and portable blue print for the popularization of Vehicle Driving Simulator in families. When the LOD function is open, the real-time drawing speed (refresh rate) of visual system is increased obviously.