iCheat: A Representation for Artistic Control of Indirect Cinematic Lighting

Juraj Obert
University of Central Florida
Jaroslav Křivánek
Czech Technical University in Prague
Fabio Pellacini
Dartmouth College

Daniel Sýkora
Czech Technical University in Prague
Sumanta Pattanaik
University of Central Florida



Abstract

Thanks to an increase in rendering efficiency, indirect illumination has recently begun to be integrated in cinematic lighting design, an application where physical accuracy is less important than careful control of scene appearance. This paper presents a comprehensive, efficient, and intuitive representation for artistic control of indirect illumination. We encode user's adjustments to indirect lighting as scale and offset coefficients of the transfer operator. We take advantage of the nature of indirect illumination and of the edits themselves to efficiently sample and compress them. A major benefit of this sampled representation, compared to encoding adjustments as procedural shaders, is the renderer-independence. This allowed us to easily implement several tools to produce our final images: an interactive relighting engine to view adjustments, a painting interface to define them, and a final renderer to render high quality results. We demonstrate edits to scenes with diffuse and glossy surfaces and animation.

Full Text   BibTeX

Computer Graphics Forum 27(4):1217–1223, 2008
(EGSR'08, Sarajevo, Bosnia, June 2008).

Sketch video (SIGGRAPH 2007)



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