Simple and fast terrain rendering using graphics hardware

Authors:
Hanli Zhao;Xiaogang Jin;Jianbing Shen
Affiliations:
State Key Lab of CADSCG, Zhejiang University, Hangzhou, P.R. China;State Key Lab of CADSCG, Zhejiang University, Hangzhou, P.R. China;State Key Lab of CADSCG, Zhejiang University, Hangzhou, P.R. China
Venue:
ICAT'06 Proceedings of the 16th international conference on Advances in Artificial Reality and Tele-Existence
Year:
2006

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Abstract

We present a simple and fast LOD rendering technique for terrain visualization, which sufficiently makes use of the GPU capabilities. At load time, we tile the terrain geometry, compute a discrete set of LODs for each tile analog to mipmaps for texture, and cache index buffers for all the levels. At run time, the LOD level is selected on the CPU and the geometrical morphing algorithm is implemented on the GPU. Additionally, we use coherent hierarchical culling (CHC) algorithm to cull away fully occluded tiles to further accelerate the frame rates. Our approach sufficiently exploits both the spatial and temporal coherence of terrain geometry and reduces the bandwidth requirements. Our method can achieve very high frame rates especially when a player wanders through a valley in games or other applications.