Data Transmission and Caching Method for Terrain Rendering on Network

To keep the continuity of the terrain rendering on network,by exploiting the distinct difference on data layout and data prefetching direction between terrain and streaming media,and combining the terrain rendering technology on GPU proposed recently,the authors design a new transmission and caching method for terrain rendering on network.In this method,the granular of single terrain block coded with wavelet zerotree is decided according to the client capability and network bandwidth and the multi-resolution representation of the rendered terrain is constructed by clients,which can reduce the dependency between rendered data and network bandwidth.The transmission quantity of each terrain block around the viewpoint is designed to be adaptively adjusted according to the viewpoint positions to make the rendering continuous. At the same time,a caching method which stores terrain blocks around the viewpoints is designed for the client to guarantee the data continuance when the network is congested.This method can improve the performance and effect of the terrain rendering on network greatly.