视相关地形多分辨率模型在飞行仿真中的应用

对于飞行仿真中海量地形数据,现有的软硬件无法直接对其进行实时连续的绘制,采用视点相关的层次细节模型可以有效地提高实时绘制的性能.该文针对飞行仿真中大地形实时显示问题,对现有的视点相关多分辨率模型算法进行了改进,采用四叉树结构来表示地形,给出了节点的数据结构和构建四叉树的算法;提出了一种新的细节层次选择误差度量标准;实现了视点相关的连续多分辨率地形网格的简化和实时绘制.

View-dependent Terrain Multiresolution Model in Flight Simulation

Large scale terrain in flight simulation is hard to be rendered with existing hardware and graphic device.The view-dependent Level of Detail(LOD) can efficiently improve the real-time displaying capability.In this paper,we improve the view-dependent LOD modeling algorithm in flight simulation,use quad-tree to represent terrain,give the node data structure and the algorithm to construct the quad-tree.The screen-space error metric algorithm is modified and a real-time continuous view-dependent multi-resolution model for simplification and rendering is realized.