大规模场景虚拟漫游系统设计与实现  

The Design and Implementation of Virtual Walkthrough System of Large Scale Scene

作　　者：王源[1] 刘建永[1] 曾京[1] 高磊[1] 

机构地区：[1]解放军理工大学工程兵工程学院,江苏南京210007

出　　处：《工程图学学报》2010年第5期107-111,共5页Journal of Engineering Graphics

摘　　要：以点状目标、线状目标、面状目标和三角网目标的建模实现对大规模场景信息的三维建模,并应用有向无环树状场景图,以面向对象的方式管理场景数据,既有利于场景结构与层次的表达,又节省了存储空间,方便了数据的操作。通过对视景体可见区外的场景图节点进行裁剪处理,大大减少了系统渲染处理的数据量。应用实例表明,系统在保持场景真实感的情况下,提高了绘制速度,满足了大规模场景实时漫游的要求。3D model of large scale scene is accomplished through the point-object modeling,line-object modeling,face-object modeling and triangle nets-object modeling.The scene data is organized by directed acyclic graph（DAG） using the object oriented（OO） mode.All these are propitious to expression structure and hierarchy of scene,memory saving and data operation.The rendering node of DAG is cut down greatly through cutting out of visible field of view volume.The experiment results show that the system can achieve good performance on the quality of scene and the speed of rendering.

关 键 词：计算机应用 三维场景建模 有向无环树状场景图 视景体可见区 实时漫游 

分 类 号：TH111[机械工程—机械设计及理论]