摘要
提出了一种基于DirectX和LOD的DEM动态构网算法。该算法使用四叉数和LOD层次模型技术来解决地形数据的动态简化和动态构网,有效地简化了复杂的地形数据,在满足真实的前提下,尽可能多地删除冗余三角形。生成的三维地形的渲染速度达到了20到30帧,基本上满足了实时显示的要求。
This paper puts forward an algorithm to dynamic create networks for DEM basing on DirectX and LOD. This algorithm uses the quadtrees to save DEM data and uses LOD to simplify the triangles dynamically and create networks dynamically for DEM. This algorithm can simplify the complicated terrain data effectively and it deletes and simplifies the redundant triangles basing on satisfying the need of reality. According to the tests, it is shown that the screen created by this algorithm can display in real time.
出处
《北京测绘》
2008年第2期5-8,15,共5页
Beijing Surveying and Mapping
关键词
LOD
DEM
四叉树
动态构网
实时渲染
Level of Detail
Digital Elevation Model
Quadtrees
Creating Networks Dynamically
Real Time
