关键词: 地形可视化, 瓦片块四叉树, 纹理数组, 图形处理单元

Abstract: A real-time rendering method for largearea terrain data was presented utilizing the techniques such as texture array, vertex texture fetching, tiled quad tree grid and terrain data block partition. The whole terrain model was partitioned into equal size blocks and the blocks were stored in CPU memory in tilepyramid model. The potentially visible portion of the terrain was cached at the highest necessary resolution in form of texture arrays and was rendered from the GPU. The CPU sent tiled quad tree flat grid, which was displaced by fetching the heights stored in the GPU cache. The GPU cache was updated continuously as the viewpoint changed. The experimental results show that the method is very efficient and suitable for applications of massive terrain rendering and interactive walkthrough.

Key words: terrain visualization, tiled quad tree, texture array, graphic processing unit