Research On The Technology Of Variable Terrain Effects In Large Scene

With the development of virtual reality technology in all kinds of virtual simulation system, people are no longer satisfied with the past static terrain and hope that the terrain can be changed dynamically according to the actual situation of the scene and adding special effects to improve the simulation system’s sense of reality and immersion. In this paper, on the basis of predecessors’ research, studied the technology of variable terrain effects in large scene. It is mainly studies the large scene terrain rendering method and meteorite crater drawing method. Design and implement a more realistic and interactive simulation system of generating meteorite crater. The main research results of this paper are as follows:(1) Aiming at the problem of really and smoothly rendering large scene terrain, research and propose a method based on distance dependence LOD algorithm based on the analysis of previous terrain rendering algorithms. Through read the terrain elevation map, constructing quad tree data structure, view frustum culling, terrain nodes selection, terrain nodes rendering, terrain processing node crack this several steps to achieve the rendering of large terrain scene. Finally, experiments show that the method based on distance dependence LOD algorithm is feasible and effective. In the large scene terrain rendering, it can not only guarantee the accuracy of the terrain but also improve the rendering speed, and smoothly transit between different levels of detail.(2) Aiming at the problem of real-timely and authenticity of variable terrain, on the basis of predecessprs studying on methods of crater modeling, rutting modeling and footprints modeling and dynamic terrain rendering algorithm, put forward the meteorite crater rendering method based on the regular grids and changing the height of terrain nodes. This method firstly determines the position of the crater when the meteorite impacts the ground, then determines the type of meteorite crater and calculates the mathematical function model of meteorite craters. After that, modify the terrain elevation value of the leaf nodes according to the mathematical model. At last, rebuild the level of details quad tree and draw the visible terrain, so as to realize the dynamically rendering meteorite crater in the variable terrain. Experiments show that this method is feasible and effective.(3) This paper designs and implements a simulation system of generating meteorite craters. The system is mainly simulation the formation process of meteorite crater after meteorite hitting the ground. In this paper, four main modules are designed and implemented, such as model loading, scene interaction, particle system and audio effects. It uses the methods of this paper and achieves the effect of the large scene terrain rendering and dynamically rendering of the crater in the scene. The running results of this system show that the design of the meteorite crater forming simulation system has a strong sense of reality and immersive.