The Technology Research Of Modeling And Rendering Ocean Scene In The Large-scale Virtual Battlefield Environment

Utilizing virtual battlefield to carry on military training and simulation manoeuvre has many strongpoints, such as immersing, interaction, iteration and so on, which will become the effective way that every military country carries on strategy, tactics simulation campaign drill in new period. Any virtual battlefield has a virtual campaign natural environment that can simulate the visual effect of true world. The things in this natural environment can change dynamically in real time with the development of the war process. As one important composing part, the research on ocean scene is of high academic and applied value.This paper mostly studies the key modeling and real-time rendering technology of ocean scene in large-scale virtual battlefield environment. The main contents include the modeling and real-time rendering technology of highly realistic deep sea and shallow sea to build the visual effect of ocean with high immersing feelings in real time, the creating technology of special effects in ocean surface scene, and the implement of large-scale virtual naval battle scene. The main work of this paper is as follows.On the basis of researching the characteristics of deep sea surface, the modeling and real-time rendering algorithm of deep sea surface based on wrapped noise fractal surfaces is proposed. Firstly, the LOD model of ocean surface grids based on Patch is built. Aiming at the problems of T-conjunction vertices and cracks between different resolution patches, Joint Template is introduced to implement the stitching between different resolution patches seamlessly. Then Perlin noises of different frequencies are introduced to create noise fractal surface which is the stimulator of ocean height field, and the ocean surface is simulated by wrapping the fractal surfaces. Lastly, the method of mapping these fractal surfaces to themselves is proposed to obtain a sequence of fractal surfaces of different time, and then the continuously dynamic ocean surface is simulated. When rendering the optics of ocean surface, GPU-based normal map computing is implemented, the cube map technology is adopted to simulate the sky background around ocean, and the local reflection effect of sunlight is computed by linear texture lookup table based on Fresnel theorem. The experiment results show that this algorithm can build deep sea scene with high reality in real time.Intergrating the strongpoints of wave spectrum model and Perlin noise model, the modeling and rendering algorithm of shallow sea surface based on the mixed model of wave spectrum and noise fractal surface is proposed. A decomposed model of wave direction-distribution function is proposed by analyzing the ocean wave spectrum model. According to the wave refraction theory, the wave model of shallow sea surface is simplified to the linear synthesis of the directional...