@article{Nguyen2013,
TITLE = {Material Editing in Complex Scenes by Surface Light Field Manipulation and Reflectance Optimization},
AUTHOR = {Nguyen, Chuong and Scherzer, Daniel and Ritschel, Tobias and Seidel, Hans-Peter},
LANGUAGE = {eng},
ISSN = {0167-7055},
DOI = {10.1111/cgf.12038},
LOCALID = {Local-ID: 4CD3871C310E2855C1257B010065285A-Nguyen2013},
PUBLISHER = {Wiley-Blackwell},
ADDRESS = {Oxford, UK},
YEAR = {2013},
DATE = {2013},
ABSTRACT = {This work addresses the challenge of intuitive appearance editing in scenes with complex geometric layout and complex, spatially-varying indirect lighting. In contrast to previous work, that aimed to edit surface reflectance, our system allows a user to freely manipulate the surface light field. It then finds the best surface reflectance that ``explains'' the surface light field manipulation. Instead of classic \mathcal L_2 fitting of reflectance to a combination of incoming and exitant illumination, our system infers a sparse \mathcal L_0 change of shading parameters instead. Consequently, our system does not require ``diffuse'' or ``glossiness'' brushes or any such understanding of the underlying reflectance parametrization. Instead, it infers reflectance changes from scribbles made by a single simple color brush tool alone: Drawing a highlight will increase Phong specular; blurring a mirror reflection will decrease glossiness; etc. A sparse-solver framework operating on a novel point-based, pre-convolved lighting representation in combination with screen-space edit upsampling allows to perform editing interactively on a GPU.},
JOURNAL = {Computer Graphics Forum (Proc. EUROGRAPHICS)},
VOLUME = {32},
NUMBER = {2},
PAGES = {185--194},
BOOKTITLE = {EUROGRAPHICS 2013},
EDITOR = {Poulin, P. and Navazo, I.},
}