Geometry Clipmap算法扩展研究

Research on the Extension of Geometry Clipmap Algorithm

Geometry Clipmap算法是一种基于GPU优化的LOD算法,在研究Geometry Clipmap算法的基础上,对该算法进行了扩展。增加了地形数据调度模块,采用地形块预读取和预卸载策略,实现对海量地形数据的内外存管理。对内存中Clipmap堆栈的数据结构进行了改进,取消了原始算法中Clipmap Pyramid部分。将Geometry Instancing技术引入渲染过程,进一步提升了渲染速度。实验表明,该算法实用有效,能够满足大规模地形可视化的实时渲染要求。

Geometry Clipmap is a GPU-based LOD algorithm, and this paper extends Geometry Clipmap algorithm on the basis of doing research on it. It increases the terrain data scheduling module, uses the terrain prefetch and pre-uninstall strategy to achieve internal and external management of massive terrain datum. It improves the data structure of Clipmap stack in memory and removes the Clipmap Pyramid part of Geometry Clipmap algorithm. Geometry Instancing technology is introduced into the rendering process to further improve the rendering speed. Experiments show that this algorithm is practical and effective to meet the needs of real-time rendering large-scale terrain visualization.