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ACM Transactions on Graphics (TOG), Volume 32 Issue 2, April 2013

Interactive albedo editing in path-traced volumetric materials
Milovš Hašan, Ravi Ramamoorthi
Article No.: 11
DOI: 10.1145/2451236.2451237

Materials such as clothing or carpets, or complex assemblies of small leaves, flower petals, or mosses, do not fit well into either BRDF or BSSRDF models. Their appearance is a complex combination of reflection, transmission, scattering,...

A gradient-based implicit blend
Olivier Gourmel, Loic Barthe, Marie-Paule Cani, Brian Wyvill, Adrien Bernhardt, Mathias Paulin, Herbert Grasberger
Article No.: 12
DOI: 10.1145/2451236.2451238

We introduce a new family of binary composition operators that solves four major problems of constructive implicit modeling: suppressing bulges when two shapes merge, avoiding unwanted blending at a distance, ensuring that the resulting shape...

Near-invariant blur for depth and 2D motion via time-varying light field analysis
Yosuke Bando, Henry Holtzman, Ramesh Raskar
Article No.: 13
DOI: 10.1145/2451236.2451239

Recently, several camera designs have been proposed for either making defocus blur invariant to scene depth or making motion blur invariant to object motion. The benefit of such invariant capture is that no depth or motion estimation is required...

A practical microcylinder appearance model for cloth rendering
Iman Sadeghi, Oleg Bisker, Joachim De Deken, Henrik Wann Jensen
Article No.: 14
DOI: 10.1145/2451236.2451240

This article introduces a practical shading model for cloth that can simulate both anisotropic highlights as well as the complex color shifts seen in cloth made of different colored threads. Our model is based on extensive Bidirectional...

Closest point turbulence for liquid surfaces
Theodore Kim, Jerry Tessendorf, Nils Thürey
Article No.: 15
DOI: 10.1145/2451236.2451241

We propose a method of increasing the apparent spatial resolution of an existing liquid simulation. Previous approaches to this “up-resing” problem have focused on increasing the turbulence of the underlying velocity field. Motivated...

Adaptive progressive photon mapping
Anton S. Kaplanyan, Carsten Dachsbacher
Article No.: 16
DOI: 10.1145/2451236.2451242

This article introduces a novel locally adaptive progressive photon mapping technique which optimally balances noise and bias in rendered images to minimize the overall error. It is the result of an analysis of the radiance estimation in...

Simulating liquids and solid-liquid interactions with lagrangian meshes
Pascal Clausen, Martin Wicke, Jonathan R. Shewchuk, James F. O'Brien
Article No.: 17
DOI: 10.1145/2451236.2451243

This article describes a Lagrangian finite element method that simulates the behavior of liquids and solids in a unified framework. Local mesh improvement operations maintain a high-quality tetrahedral discretization even as the mesh is advected...

Gloss perception in painterly and cartoon rendering
Adrien Bousseau, James P. O'shea, Frédo Durand, Ravi Ramamoorthi, Maneesh Agrawala
Article No.: 18
DOI: 10.1145/2451236.2451244

Depictions with traditional media such as painting and drawing represent scene content in a stylized manner. It is unclear, however, how well stylized images depict scene properties like shape, material, and lighting. In this article, we describe...

Wave-based sound propagation in large open scenes using an equivalent source formulation
Ravish Mehra, Nikunj Raghuvanshi, Lakulish Antani, Anish Chandak, Sean Curtis, Dinesh Manocha
Article No.: 19
DOI: 10.1145/2451236.2451245

We present a novel approach for wave-based sound propagation suitable for large, open spaces spanning hundreds of meters, with a small memory footprint. The scene is decomposed into disjoint rigid objects. The free-field acoustic behavior of each...

A benchmark for surface reconstruction
Matthew Berger, Joshua A. Levine, Luis Gustavo Nonato, Gabriel Taubin, Claudio T. Silva
Article No.: 20
DOI: 10.1145/2451236.2451246

We present a benchmark for the evaluation and comparison of algorithms which reconstruct a surface from point cloud data. Although a substantial amount of effort has been dedicated to the problem of surface reconstruction, a comprehensive means of...