基于R树索引的三维场景细节层次自适应控制方法

摘要

Aiming at the requirement of large-scale 3D city modelling,a method is puts forward to organize LOD scene based on R-tree＇s hierarchical structure.LOD scene can be automatically generated from leaf node layer to root node,and efficient algorithm of LOD search are also designed and implemented.By experimental analysis,it is proved that scene complexity can be quantitatively altered by adjusting one defined LOD parameter,and further adaptively control LOD of 3D scene,which suits building and tree type especially.%针对大规模三维城市建模需要,介绍一种基于三维R树索引的多细节层次（简称LOD）管理方法,从叶节点层向根节点自动生成LOD场景,并设计实现LOD检索的算法。通过试验分析,证明本文的LOD定义参数能够定量控制三维场景中的渲染目标数目,进而实现三维场景的自适应可视化方法,尤其适合于建筑物和树木类型的地物目标。