Journal
ACM TRANSACTIONS ON GRAPHICS
Volume 33, Issue 2, Pages -Publisher
ASSOC COMPUTING MACHINERY
DOI: 10.1145/2591011
Keywords
Algorithms; Design; Human Factors; Cartoons; global illumination; non-photorelasitic rendering; 2D-to-3D conversion; bas-relief
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Funding
- Technology Agency of the Czech Republic [TE01020415]
- Czech Science Foundation [P202/12/2413]
- Grant Agency of the Czech Technical University in Prague [SGS13/214/OHK3/3T/13]
- COST Action [IC1005]
- Swiss National Science Foundation [200021_137879]
- ERC grant iModel [StG-2012-306877]
- Swiss National Science Foundation (SNF) [200021_137879] Funding Source: Swiss National Science Foundation (SNF)
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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.
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