Simplification Technology for Real-time Rendering of Large-scale 3D Terrain

Considering topographic features and view-dependent characteristic,a simple evaluation function for quad-tree subdivision was used to generate dynamic multi-resolution terrain model in real time.While 3D scene roaming,a mechanism of multi-level buffering was used for data scheduling and rendering under the condition of quickly viewpoint transformation.At the same time,an adaptive LOD scheduling which comprehensive consideration of frame rate and subdivision evaluation function was proposed.A multi-level texture mapping method consistent with the terrain scheduling was used to render the image texture.At last,the algorithms were achieved by programming,and the large-scale 3D terrain visualization was realized based on the simplify methods.