Real-time all-frequency global llumination with radiance caching  

作　　者：Youxin Xing Gaole Pan Xiang Chen Ji Wu Lu Wang Beibei Wang 

机构地区：[1]School of Software,Shandong University,Jinan 250101,China [2]School of Computer Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China

出　　处：《Computational Visual Media》2024年第5期923-936,共14页计算可视媒体（英文版）

基　　金：supported by the National Key R&D Program of China under Grant No.2020YFB1709203;the National Natural Science Foundation of China under Grant Nos.62272275 and 62172220;the Shandong Provincial Natural Science Foundation of China under Grant No.ZR2020LZH016.

摘　　要：Global illumination(GI)plays a crucial role in rendering realistic results for virtual exhibitions,such as virtual car exhibitions.These scenarios usually include all-frequency bidirectional reflectance distribution functions(BRDFs),although their geometries and light configurations may be static.Rendering allfrequency BRDFs in real time remains challenging due to the complex light transport.Existing approaches,including precomputed radiance transfer,light probes,and the most recent path-tracing-based approaches(ReSTIR PT),cannot satisfy both quality and performance requirements simultaneously.Herein,we propose a practical hybrid global illumination approach that combines ray tracing and cached GI by caching the incoming radiance with wavelets.Our approach can produce results close to those of ofline renderers at the cost of only approximately 17 ms at runtime and is robust over all-frequency BRDFs.Our approach is designed for applications involving static lighting and geometries,such as virtual exhibitions.

关 键 词：real-time global illumination all-frequency BRDFs Haar wavelets radiance caching 

分 类 号：TB383.4[一般工业技术—材料科学与工程] TP391.41[自动化与计算机技术—计算机应用技术]