A Real-time Rendering Method of Global Terrain Based on Quad-tree
YU Fengkun · Journal of Academy of Equipment · 2013
For the demand of the real-time global terrain visualization,a real-time rendering method of global terrain based on quad-tree is proposed.Firstly,an intersection area of scene culling cone and ideal sphere is computed.Secondly,the visible area is subdivided based on the projection area,and a visible set of multi-resolution terrain is obtained.Finally,the resampling of the normalized grids is implemented to eliminate the cranny,as well as to reduce the redundancy of the data.The results show that the algorithm can filter the mass data quickly,and get a multi-resolution terrain visible node set as small as possible,so as to maintain the amount of graphics data during drawing in each frame at a relatively constant degree,and it is basic for real-time display of the global terrain.