基于GPU的地形遮挡剔除算法  

GPU-Based Occlusion Culling Method for Terrain Rendering

作　　者：达来[1] 曾亮[1] 李思昆[1] 

机构地区：[1]国防科学技术大学计算机学院,长沙410073

出　　处：《系统仿真学报》2006年第11期3165-3167,3171,共4页Journal of System Simulation

基　　金：973项目(2002CB312105)。

摘　　要：针对大规模地形场景,以GPU提供的遮挡查询功能为基础,提出了一种基于GPU的遮挡剔除算法。根据增量水平线原理,利用模板缓冲区进行重叠测试,并采用查询列表方法避免了CPU和GPU互相等待造成的延迟。实验结果表明,该算法有效地减少了送入图形流水线的几何数据,并在贴地漫游的情况下,显著提高了场景绘制速度。Hardware occlusion query is used to perform occlusion culling for large scale terrain rendering based on well-known occlusion horizon algorithm. In order to make use of hardware occlusion query, the method uses stencil buffer to perform the occlusion test. Moreover, query list is used to avoid the latency between CPU and GPU caused by issuing the query and availability of the result. The experimental results demonstrate that the method reduces the geometry sent to the graphics pipeline and improves the rendering frame rate significantly when navigating at ground level.

关 键 词：GPU 遮挡查询 遮挡剔除 地形绘制 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]