Research On Undersea Terrain3D Visualization Technology

With the development of the national economy, national defense, and the development ofthe oceans and their use is increasingly important to the state, marine3D environmentcompared to marine two-dimensional environment model demonstrate greater strengths anddevelopment prospects. The real ocean three-dimensional model of the urgency is graduallyrealized by people. The same time as the rapid development of computer hardware andsoftware,3D visualization and virtual reality technology has also been a wide range ofdevelopment applications. It all provided favorable conditions for the development ofundersea3D visualization technology. Seabed3D visualization technology research carriedout in this context.First, this paper analyzes the undersea terrain modeling foundation, three aspects thatthe acquisition of the data from the ocean topography, seafloor topography data storage model,seabed terrain data interpolation methods were analyzed, then elect the electronic chart as adata source, the regular grid model as the undersea terrain data storage model, naturalneighbor interpolation as this article seafloor topography data interpolation method.Then, the article describes the natural neighbor interpolation method based on Voronoidiagram and Delaunay triangles, comparing the advantages and disadvantages of Sibsoninterpolation and Laplace interpolation, using a fast method to find the natural neighbor, thusavoiding to generate Voronoi diagram and Delaunay triangles. Finally, we analyze thelimitations of the Laplace interpolated that Laplace interpolation terrain data can not beformed on the convex hull and external, so this paper presents a mixed interpolation methodthat the weighted average method and Laplace-interpolation. Combined with the laboratoryinternal electronic chart data source simulation to achieve, from interpolation speedinterpolation accuracy and a comparative analysis of the weighted average method and thetraditional natural neighbor interpolation method.Again, the article describes ROAM technology foundation based on binary tree, andanalysis the advantages and disadvantages of the current frustum clipping. In this paper, weimproved method based on the frustum fast rough cutting and sub-block frustum meticuloustailoring. This paper proposed a based frustum quick rough cropping and sub-block, as thecut-off body of meticulous cropped improvement, at the same time in the frustum fast roughcutting, we use a simplified frustum body of seafloor topography fast cutting. Using mixedcropping methods, we not only speed up the reduction of speed, and also keep the details of the terrain, and triangles while reducing redundancy.Finally, based on the weighted average method and Laplace interpolation mixedinterpolation the rules grid data generated, combined with improved ROAM algorithm usingthe OpenGL graphics API function to create the seabed three-dimensional visualization ofroaming system. Traditional ROAM algorithm from the seabed topography system roamingthe frame rate, the number of triangles generated technical indicators and comparativeanalysis.