基于LOD的海量地形数据并行渲染技术

摘要

随着地球空间信息技术的发展,建立具有海量空间数据的大规模虚拟地形场景越来越重要.然而,面对海量的地形数据,如何简化地形,提升绘制与渲染效率,是地形渲染的关键.本文对LOD地形渲染技术、大规模数据集的分析与处理、并行计算等相关技术进行了研究,提出了基于LOD的海量地形数据并行渲染技术.该技术首先使用LOD四叉树简化地形,其次结合多核CPU并行计算的方法提升效率,最后结合大规模数据调度策略,实现了海量地形数据的并行渲染,并分析对比了非并行和并行情况下的实验结果.本文所取得的理论与技术方面的成果可为大规模场景渲染提供新的技术思路.%With the development of geo spatial information technology,it is more important to build large scale virtual terrain scene with massive spatial data.However,in the face of massive terrain data,how to simplify terrain,improve rendering and rendering efficiency,is the key to the terrain rendering.After the research of the terrain rendering technology of LOD,the analysis and processing of large scale data sets,parallel computing and other related technologies,the parallel rendering technology of massive terrain data based on LOD is proposed.At first,quadtree LOD is used to simplified terrain,secondly it is combined with multi-core CPU parallel computing method to enhance efficiency,then it is combined with the large data scheduling strategy,finally it realizes the parallel rendering of massive terrain data,and it analyzes the non-parallel and parallel experiments under the same conditions.The theoretical and technical achievements in the research can provide a new idea for large scale scene rendering.