基于Direct3D的大规模地形渲染技术研究

On large terrain's real-time rending technique based on Direct3D

提出了一种基于地形分块管理思想的大规模地形渲染算法——井地算法.该算法将大规模高程地形数据按照一定大小进行分割并存储,根据视点位置和漫游的要求建立5点定位LOD四叉树模型,将以当前渲染的地形数据块为中心的9个(或少于9个)单位地形数据块载入内存.该算法采用Direct3D实现,能有效提升复杂三维场景中大规模地形实时渲染的效率.

A method of large terrain＇ s real-time rending based on partitioning the terrain, which can be named as ＂JINGDI＂ algorithm was proposed. In this algorithm, the massive DEM data is parted into unit-block according to the size that is computed in advance. The unit-block data is stored in resolution order, and a ＂five-point located＂ LOD mesh model is built according to the viewport position and the ramble requirement. Then ,nine or less than nine unit-blocks of terrain date are loaded into system memory. This method has been implemented with Direct3D and can increase the rendering speed of 3D scenes effectively.