开源软件VTP中的大规模实时地形绘制算法实验研究  

Experimental research on large-scale real-time terrain algorithm in source software-VTP

作　　者：谭玉敏[1] 莫智[1] 刘德强[1] 

机构地区：[1]北京航空航天大学土木工程系,北京100083

出　　处：《测绘科学》2008年第3期187-188,209,共3页Science of Surveying and Mapping

基　　金："十一五"863计划专题(课题编号:2006AA12Z220)

摘　　要：本文对开源3DGIS软件VTP中的一种视点相关多分辨率地形模型生成算法——McNally算法进行了实验研究,结果表明:三角形数量大于5000时,用该算法绘制的地形弹跳现象消失;地形赋予纹理后,分辨率变化对显示的效果的影响很小,因此,在满足显示效果的情况下,没有必要追求过高的分辨率,即三角形目标个数。McNally algorithm, a kind of View-dependent Multi-resolution Terrain Model producing algorithm for large scale terrain rendering in open source 3dGIS software - VTP, is studied by several experiments. Results are as the following： when the number of triangles is larger than 5000, terrain rendered by this algorithm has no bounce phenomenon ; if texture data is added to terrain for rendering together, there is little impact on display when changing resolution, so too high resolution（that is the number of triangles） is not necessary only if it has meet the need of display.

关 键 词：VTP 多分辨率模型 McNally算法 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]