Study Of Large Scale Terrain Simulation In The Virtual Reality Environment

Virtual reality is an important technology in the field of 3D terrain, which is based on 3D terrain grid and combined with digital elevation models and sensing, scheduling. 3D vision technology can build an immersive virtual terrain world. 3D terrain technology is an important component of the virtual reality system in many fields.This paper focuses on the establishment of terrain scene simulation system, the improvement of data management, the effect of terrain scene simulation system and so on. It discusses LOD algorithm, on-demand scheduling strategy and multi-resolution storage strategy to accomplish a terrain scene simulation system for its virtual effect.LOD technology sets up a similar model for the same object, the higher details level of the model, the more polygons it contains. In order to reducing the amount of calculation, when viewpoint is nearer, the model with more polygons is shown; oppositely, the model with less polygons is shown. It reduces the complexity of algorithm and provides mutual effect of system on-demand.Because the digital elevation models need longer time in visual simulation, it affects the efficiency of real-time simulation system. This paper adopts LOD algorithm, and proposes on-demand scheduling strategy and multi-resolution storage strategy to reduce the effect of the exchange of huge data on performance. The on-demand scheduling strategy divides the original data and uses some specifically algorithm to realize the dynamic management of those data. The strategy of multi-resolution storage uses binary tree to organize and storage the divided data. So it can improve the efficiency of the simulation.Experimental result shows that the optimal management of the terrain dataset provides a simple data management and speeds up the rate of system rendering and improves the efficiency of the virtual simulation.