Open AccessVirtual Area Light for Dynamic and Spatially‐Varying Area Lighting
Author(s) -
Guo Jie,
Pan Jingui
Publication year - 2015
Publication title -
chinese journal of electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.267
H-Index - 25
eISSN - 2075-5597
pISSN - 1022-4653
DOI - 10.1049/cje.2015.04.013
Subject(s) - computer science , smart lighting , computer graphics (images) , environmental science , optics , physics
We describe a technique for interactivelyrendering diffuse scenes with near‐field area lighting byintroducing a new light type called VAL (Virtual arealight). The VALs are generated via the subdivision of theprimary planar luminaire, and near‐field area lighting effectscan be simulated directly from the geometric andradiometric information of these VALs. To ensure a highfidelity of soft shadows, we propose the multi‐PCF (Percentagecloser filter) algorithm which evaluates visibilitythrough several PCF values of each VAL. Experimentalresults reveal that our approach can render visually convincingnear‐field area lighting effects as well as soft shadowswithout any precomputation. Our strategy also enableshigh‐quality direct illumination results in fully dynamicscenes under both time‐varying and spatially‐varying arealighting conditions in the order of milliseconds.