面向三维流管可视化的各向异性屏幕空间环境光遮蔽算法  

Anisotropic screen-space ambient occlusion algorithm for 3Dstreamtubes visualization

作　　者：王安澜 李方钏 张严辞[1] Wang Anlan;Li Fangchuan;Zhang Yanci(College of Computer Science,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学计算机学院,成都610065

出　　处：《计算机应用研究》2024年第10期3166-3172,共7页Application Research of Computers

基　　金：国家重大专项资助项目(GJXM92579);四川省重点研发资助项目(2023YFG0122)。

摘　　要：屏幕空间环境光遮蔽(AO)算法是一种流行的全局光照技术,此类技术可用于辅助复杂3D流管场景的可视化,以便于更好地理解场景分布特点。对此提出一种屏幕空间各向异性AO方法来实现复杂三维流管场景可视化。其基本思想是利用三维流管的特性设计两个各向异性滤波器,来指导计算流管场景AO时的屏幕空间采样和空间复用步骤。具体而言,这种策略通过各向异性地生成垂直于流管方向的采样点计算AO。该策略可以减少算法在获取满意渲染结果时所需的样本数量。同时为了进一步提高算法性能,提出对邻近像素的AO计算结果进行沿流管方向各向异性空间复用。实验结果表明,该算法在渲染质量和性能上均优于现有的屏幕空间AO算法方案。Screen-space ambient occlusion(AO)is a popular global illumination technique which can be used to achieve a better understanding of complex 3D streamtubes scenes.This paper proposed an anisotropic screen-space AO method to visua-lize complex 3D streamtubes.The basic idea is to utilize the characteristics of 3D streamtubes to design two anisotropic filters to guide screen-space sampling as well as spatial reusing.More specifically,this paper proposed to anisotropically generate samples perpendicular to the direction of streamtube to calculate AO.This mechanism can reduce the number of samples required to generate satisfactory results.In order to further improve the performance of the algorithm,this paper proposed to anisotropically reuse AO results from nearby pixels along the streamtube direction.The experimental results indicate that the proposed algorithm outperforms the existing solutions both in rendering quality and performance.

关 键 词：流管可视化 环境光遮蔽 各向异性 全局光照 屏幕空间 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]