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ACM Transactions on Graphics (TOG), Volume 34 Issue 3, April 2015

BendFields: Regularized Curvature Fields from Rough Concept Sketches
Emmanuel Iarussi, David Bommes, Adrien Bousseau
Article No.: 24
DOI: 10.1145/2710026

Designers frequently draw curvature lines to convey bending of smooth surfaces in concept sketches. We present a method to extrapolate curvature lines in a rough concept sketch, recovering the intended 3D curvature field and surface normal at each...

Simulating the Visual Experience of Very Bright and Very Dark Scenes
David E. Jacobs, Orazio Gallo, Emily A. Cooper, Kari Pulli, Marc Levoy
Article No.: 25
DOI: 10.1145/2714573

The human visual system can operate in a wide range of illumination levels due to several adaptation processes working in concert. For the most part, these adaptation mechanisms are transparent, leaving the observer unaware of his or her absolute...

Complex Luminaires: Illumination and Appearance Rendering
Edgar Velázquez-Armendáriz, Zhao Dong, Bruce Walter, Donald P. Greenberg
Article No.: 26
DOI: 10.1145/2714571

Simulating a complex luminaire such as a chandelier is expensive and slow, even using state-of-the-art algorithms. A more practical alternative is to use precomputation to accelerate rendering. Prior approaches cached information on an aperture...

Water Wave Animation via Wavefront Parameter Interpolation
Stefan Jeschke, Chris Wojtan
Article No.: 27
DOI: 10.1145/2714572

We present an efficient wavefront tracking algorithm for animating bodies of water that interact with their environment. Our contributions include: a novel wavefront tracking technique that enables dispersion, refraction, reflection, and...

A Total Variation Approach for Customizing Imagery to Improve Visual Acuity
Carlos Montalto, Ignacio Garcia-Dorado, Daniel Aliaga, Manuel M. Oliveira, Feng Meng
Article No.: 28
DOI: 10.1145/2717307

We describe a technique to generate imagery with improved sharpness for individuals having refractive vision problems. Our method can reduce their dependence on corrective eyewear. It also benefits individuals with normal vision by improving...

Discrete Derivatives of Vector Fields on Surfaces -- An Operator Approach
Omri Azencot, Maks Ovsjanikov, Frédéric Chazal, Mirela Ben-Chen
Article No.: 29
DOI: 10.1145/2723158

Vector fields on surfaces are fundamental in various applications in computer graphics and geometry processing. In many cases, in addition to representing vector fields, the need arises to compute their derivatives, for example, for solving...

LOD Generation for Urban Scenes
Yannick Verdie, Florent Lafarge, Pierre Alliez
Article No.: 30
DOI: 10.1145/2732527

We introduce a novel approach that reconstructs 3D urban scenes in the form of levels of detail (LODs). Starting from raw datasets such as surface meshes generated by multiview stereo systems, our algorithm proceeds in three main steps:...

Hyperspectral Modeling of Skin Appearance
Tenn F. Chen, Gladimir V. G. Baranoski, Bradley W. Kimmel, Erik Miranda
Article No.: 31
DOI: 10.1145/2701416

Exploration of the hyperspectral domain offers a host of new research and application possibilities involving material appearance modeling. In this article, we address these prospects with respect to human skin, one of the most ubiquitous...

Using Nesterov's Method to Accelerate Multibody Dynamics with Friction and Contact
Hammad Mazhar, Toby Heyn, Dan Negrut, Alessandro Tasora
Article No.: 32
DOI: 10.1145/2735627

We present a solution method that, compared to the traditional Gauss-Seidel approach, reduces the time required to simulate the dynamics of large systems of rigid bodies interacting through frictional contact by one to two orders of magnitude....

RingIt: Ring-Ordering Casual Photos of a Temporal Event
Hadar Averbuch-Elor, Daniel Cohen-Or
Article No.: 33
DOI: 10.1145/2735628

The multitude of cameras constantly present nowadays redefines the meaning of capturing an event and the meaning of sharing this event with others. The images are frequently uploaded to a common platform, and the image navigation challenge...

Real-Time Nonlinear Shape Interpolation
Christoph Von-Tycowicz, Christian Schulz, Hans-Peter Seidel, Klaus Hildebrandt
Article No.: 34
DOI: 10.1145/2729972

We introduce a scheme for real-time nonlinear interpolation of a set of shapes. The scheme exploits the structure of the shape interpolation problem, in particular the fact that the set of all possible interpolated shapes is a low-dimensional...