Ink-and-Ray

Bas-Relief Meshes for Adding Global Illumination Effects to Hand-Drawn Characters

Daniel Sýkora
CTU in Prague, FEE
 
Ladislav Kavan
University of Pennsylvania
ETH Zurich
 
Martin Čadík
MPI Informatik / CTU in Prague, FEE
Brno University of Technology
 
Ondřej Jamriška
CTU in Prague, FEE
Alec Jacobson
ETH Zurich
 
Brian Whited
Walt Disney Animation Studios
 
Maryann Simmons
Walt Disney Animation Studios
 
Olga Sorkine-Hornung
ETH Zurich




Abstract

We present a new approach for generating global illumination renderings of hand-drawn characters using only a small set of simple annotations. Our system exploits the concept of bas-relief sculptures, making it possible to generate 3D proxies suitable for rendering without requiring side-views or extensive user input. We formulate an optimization process that automatically constructs approximate geometry sufficient to evoke the impression of a consistent 3D shape. The resulting renders provide the richer stylization capabilities of 3D global illumination while still retaining the 2D hand-drawn look-and-feel. We demonstrate our approach on a varied set of hand-drawn images and animations, showing that even in comparison to ground-truth renderings of full 3D objects, our bas-relief approximation is able to produce convincing global illumination effects, including self-shadowing, glossy reflections, and diffuse color bleeding.

Full text   BibTeX

ACM Transactions on Graphics 33(2):16, 2014
(SIGGRAPH 2014, Vancouver, Canada, August 2014).

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