三维海底地形仿真的研究

摘要

In light of the issue of fast large-scale seabed terrain rendering,we present the terrain generation method which is based on combining the geometrical mipmapping (GeoMipMap)algorithm with fractal algorithm,and use the methods of vertex-index and stratified blocking to organise terrain data.The method divides 3D seabed terrain into sub-blocks,through visibility discrimination only those sub-blocks within visual area are displayed.At the same time a simplified criterion based on block and view-point is set up,and the way of eliminating cracks between the terrain blocks with different detailed layers is presented through the criterion in order to make sure that no necessary details will be lost in terrain streamlining process.Simulation experimental result proves that the research outcome can effectively realise real-time terrain rendering.%针对快速绘制大规模海底地形的问题，提出基于几何多重映射算法与分形算法相结合生成地形的方法，采用顶点索引和分层分块的方法来组织地形数据。该方法对三维海底地形模型进行子块划分，通过可见性判别只显示视区内的子块。同时建立一种基于块和视点的简化准则，通过该准则提出消除不同细节层次的地形块之间的裂缝的方法，以保证地形精简过程中不丢失必要的细节。仿真实验证明该研究成果能够有效实现地形的实时绘制。