Virtual Area Light for Dynamic and Spatially-Varying Area Lighting

作     者：GUO Jie PAN Jingui 

作者机构：State Key Laboratory for Novel Software Technology Nanjing University 

出 版 物：《Chinese Journal of Electronics》 (电子学报(英文))

年 卷 期：2015年第24卷第2期

页      面：306-311页

核心收录：

学科分类：08[工学] 080203[工学-机械设计及理论] 0802[工学-机械工程] 

基　　金：supported by the National Science Foundation of China(No.61321491) 

主　　题：Area lighting Virtual area light Summed-area table Percentage closer filter 

摘      要：We describe a technique for interactively rendering diffuse scenes with near-field area lighting by introducing a new light type called VAL(Virtual area light). The VALs are generated via the subdivision of the primary planar luminaire, and near-field area lighting effects can be simulated directly from the geometric and radiometric information of these VALs. To ensure a high fidelity of soft shadows, we propose the multi-PCF(Percentage closer filter) algorithm which evaluates visibility through several PCF values of each VAL. Experimental results reveal that our approach can render visually convincing near-field area lighting effects as well as soft shadows without any precomputation. Our strategy also enables high-quality direct illumination results in fully dynamic scenes under both time-varying and spatially-varying area lighting conditions in the order of milliseconds.