海滨城市三维场景的混合图元渲染方法

A Hybrid Rendering Approach for 3D Seaside Urban Scenes Visualization

本文提出一种适用于海陆一体场景的大规模城市三维可视化方法。使用多重抖动采样和颜色聚类算法将城市三维模型转换为由点、线等简单图元构成的层次细节模型,通过屏幕空间投影面积进行层次细节(Level-of-detail,LOD)模型的选择,以较少数量的简单图元合成模型的近似表示,实现城市建筑的LOD渲染。实验表明,该方法具有较高的真实感,可以大幅提高城市级大场景的渲染效率,并且与几何LOD等方法相比,其性能受水体模型渲染的影响更小,更适用于海陆一体的海滨城市场景渲染。

A novel hybrid level-of-detail algorithm for large-scale seaside urban scenes rendering is introduced.We combine point,line,and splat-based rendering to synthesize large-scale urban city images.Points and lines are extracted through multi-jittered sampling and color-clustering,and encoded in a data structure that allows for automatically LOD selection.A screen-space projected area is used as the LOD selector.The algorithm selects lines for long distance views,uses points for midum-distance views,and introduces splatting for close-ups.Architecture models are then represented by few lines and points and provide high realistic rendering results.The experiment shows our approach is significantly faster than the textured models for rendering large-scale urban scenes,and is more suitable for seaside urban scenes visualization.The quality of the results is indistinguishable from the original as confirmed by algorithmic metrics.