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Visibility Editing For All‐Frequency Shadow Design
Author(s) -
Obert Juraj,
Pellacini Fabio,
Pattanaik Sumanta
Publication year - 2010
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/j.1467-8659.2010.01741.x
Subject(s) - visibility , computer science , representation (politics) , computer graphics (images) , focus (optics) , shadow (psychology) , computer vision , artificial intelligence , task (project management) , computation , channel (broadcasting) , range (aeronautics) , algorithm , psychology , physics , materials science , management , politics , political science , law , optics , economics , composite material , psychotherapist , computer network
We present an approach for editing shadows in all‐frequency lighting environments. To support artistic control, we propose to decouple shadowing from lighting and focus on providing intuitive controls to edit the former. To accomplish this task, we precompute and store scene visibility information separately from lighting and BRDFs and allow artists to edit visibility directly, by providing operations to select shadows and edit their shape. To facilitate a wider range of editing operations, we generalize visibility from binary to three‐channel oating point quantities and introduce a novel shadow representation based on computation of visibility ratios between the original render and the edited one. We demonstrate our results for diffuse and glossy surfaces, still scenes and animations.