A LOD Algorithm for Large Scale Ocean Based on OpenGL Index Vertex Array

Abstract:

Starting from the analysis of difference between large scale ocean and terrain, the paper presents a level of detail(LOD) algorithm based on OpenGL index vertex array.A grid template is built with the viewdependent method.The template treats a grid as 8 normal rectangle areas and 4 repair areas of Tcracks and dynamically calculates index array for each area. By sending vertex array and index arrays of each grid to OpenGL, the template renders each grid of LOD efficiently. Then,a realtime vivid ocean waves scene is achieved by adopting the viewdependent method to decide which vertexes should be inverted by PM wave spectrum.

Key words:viewdependent level of detail; large scale ocean; OpenGL; index vertex array; grid template