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ACM Transactions on Graphics (TOG), Volume 33 Issue 5, August 2014

Dynamic and Robust Local Clearance Triangulations
Marcelo Kallmann
Article No.: 161
DOI: 10.1145/2580947

The Local Clearance Triangulation (LCT) of polygonal obstacles is a cell decomposition designed for the efficient computation of locally shortest paths with clearance. This article presents a revised definition of LCTs, new theoretical results and...

RayCore: A Ray-Tracing Hardware Architecture for Mobile Devices
Jae-Ho Nah, Hyuck-Joo Kwon, Dong-Seok Kim, Cheol-Ho Jeong, Jinhong Park, Tack-Don Han, Dinesh Manocha, Woo-Chan Park
Article No.: 162
DOI: 10.1145/2629634

We present RayCore, a mobile ray-tracing hardware architecture. RayCore facilitates high-quality rendering effects, such as reflection, refraction, and shadows, on mobile devices by performing real-time Whitted ray tracing. RayCore consists of two...

A Local Frequency Analysis of Light Scattering and Absorption
Laurent Belcour, Kavita Bala, Cyril Soler
Article No.: 163
DOI: 10.1145/2629490

Rendering participating media requires significant computation, but the effect of volumetric scattering is often eventually smooth. This article proposes an innovative analysis of absorption and scattering of local light fields in the Fourier...

Continuity Transition with a Single Regular Curved-Knot Spline Surface
Kan-Le Shi, Jun-Hai Yong, Jia-Guang Sun, Jean-Claude Paul
Article No.: 164
DOI: 10.1145/2629647

We propose a specialized form of the curved-knot B-spline surface of Hayes [1982] that we call regular curved-knot spline surface. Unlike the original formulation where the knots of the first parametric coordinate can evolve arbitrarily...

Exposing Photo Manipulation from Shading and Shadows
Eric Kee, James F. O'brien, Hany Farid
Article No.: 165
DOI: 10.1145/2629646

We describe a method for detecting physical inconsistencies in lighting from the shading and shadows in an image. This method imposes a multitude of shading- and shadow-based constraints on the projected location of a distant point light source....

Procedural Design of Exterior Lighting for Buildings with Complex Constraints
Michael Schwarz, Peter Wonka
Article No.: 166
DOI: 10.1145/2629573

We present a system for the lighting design of procedurally modeled buildings. The design is procedurally specified as part of the ordinary modeling workflow by defining goals for the illumination that should be attained and locations where...

Fast Local Laplacian Filters: Theory and Applications
Mathieu Aubry, Sylvain Paris, Samuel W. Hasinoff, Jan Kautz, Frédo Durand
Article No.: 167
DOI: 10.1145/2629645

Multiscale manipulations are central to image editing but also prone to halos. Achieving artifact-free results requires sophisticated edge-aware techniques and careful parameter tuning. These shortcomings were recently addressed by the local...

Automating Image Morphing Using Structural Similarity on a Halfway Domain
Jing Liao, Rodolfo S. Lima, Diego Nehab, Hugues Hoppe, Pedro V. Sander, Jinhui Yu
Article No.: 168
DOI: 10.1145/2629494

The main challenge in achieving good image morphs is to create a map that aligns corresponding image elements. Our aim is to help automate this often tedious task. We compute the map by optimizing the compatibility of corresponding warped image...

Real-Time Continuous Pose Recovery of Human Hands Using Convolutional Networks
Jonathan Tompson, Murphy Stein, Yann Lecun, Ken Perlin
Article No.: 169
DOI: 10.1145/2629500

We present a novel method for real-time continuous pose recovery of markerless complex articulable objects from a single depth image. Our method consists of the following stages: a randomized decision forest classifier for image segmentation, a...

Adaptive Rendering Based on Weighted Local Regression
Bochang Moon, Nathan Carr, Sung-Eui Yoon
Article No.: 170
DOI: 10.1145/2641762

Monte Carlo ray tracing is considered one of the most effective techniques for rendering photo-realistic imagery, but requires a large number of ray samples to produce converged or even visually pleasing images. We develop a novel image-plane...

Multiple-Fluid SPH Simulation Using a Mixture Model
Bo Ren, Chenfeng Li, Xiao Yan, Ming C. Lin, Javier Bonet, Shi-Min Hu
Article No.: 171
DOI: 10.1145/2645703

This article presents a versatile and robust SPH simulation approach for multiple-fluid flows. The spatial distribution of different phases or components is modeled using the volume fraction representation, the dynamics of multiple-fluid flows is...