Abstract:

In order to resolve the problem that a massive terrain dataset can not be wholly loaded into the memory in a lump, an efficient method for realtime visualizasion of the largescale terrain environments is proposed. This method improves the GeoMipMaps algorithm and uses a terrain data block technique and a multithreaded technique to implement the dynamic scheduling of.To gain a realtime rendering result, the LOD technology and the frustum culling technology are used to reduce the number of triangles; and the VBO technology is utilized to avoid frequently transmitting large amounts of triangle data from memory to the video memory at the rendering time by storing data which is often used and less frequently changed in the video memory. The experimental results demonstrate that the proposed method can improve the efficiency and visual effect of terrain walkthrough, and render largescale terrain in a realtime way.

Key words: largescale terrain;GeoMipMaps;dynamic scheduling;crack elimination；VBO