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三维地形高质量实时矢量叠加绘制

Real-time Rendering High-Quality Vector Data on 3D Terrain

  • 摘要: 在高低起伏的三维地形上无缝叠加二维矢量数据是三维地理信息系统可视化的必须功能.为了进一步提高矢量纹理的像素有效利用率,减轻走样,提出一种采用多级联的绘制方法来改进传统基于纹理的矢量叠加绘制过程的算法.该算法采用深度剖分和屏幕空间分块2种策略对视域四棱锥进行分割,对子四棱锥内矢量进行级联绘制,并对绘制范围进行调整优化,整个算法过程完整地利用了现代GPU可编程硬件来实现.实验结果表明,文中算法适用于大范围多分辨率地形上的矢量绘制,绘制过程达到了实时,绘制效果令人满意.

     

    Abstract: In the 3D geographic information systems(GIS),it is necessary to overlay 2D vector data on a 3D multi-resolution terrain model.This paper presents a precise and efficient texture-based overlaying algorithm.It generates vector textures from cascaded view-depended cameras to improve the utilization of texture pixels.The strategies of both depth splitting and screen space dividing are further adopted.All steps are based on programmable GPU pipeline.It runs in real-time and is suitable for displaying large-scale terrain with LOD algorithms.

     

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