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Proceedings - i3d 2013: acm siggraph symposium on interactive 3d graphics and games

Proceedings - I3D 2013: ACM SIGGRAPH Symposium on Interactiv...

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17th acm siggraph symposium on interactive 3d graphics and games, i3d 2013

ISBN: (纸本)9781450319560

the proceedings contain 20 papers. the topics discussed include: AdAPT: the agent development and prototyping testbed;efficient motion retrieval in large motion databases;hybrid long-range collision avoidance for crowd simulation;interactive mesostructures;flip-flop: convex hull construction via star-shaped polyhedron in 3d*;fast global illumination for interactive volume visualization;a practical analytic model for the radiosity of translucent scenes;toward practical real-time photon mapping: efficient GPU density estimation;fast percentage closer soft shadows using temporal coherence;fast light-map computation with virtual polygon lights;efficient shading of indirect illumination applying reflective shadow maps;multi-view ambient occlusion with importance sampling;approximate depth of field effects using few samples per pixel;and filtering color mapped textures and surfaces.

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Toward practical real-time photon mapping: Efficient GPU density estimation 13

Toward practical real-time photon mapping: Efficient GPU den...

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17th acm siggraph symposium on interactive 3d graphics and games, i3d 2013

作者： Mara, Michael Luebke, david McGuire, Morgan NVIDIA Williams College United States NVIDIA United States

ISBN: (纸本)9781450319560

We describe the design space for real-time photon density estimation, the key step of rendering global illumination (Gi) via photon mapping. We then detail and analyze efficient GPU implementations of four best-of-breed algorithms. All produce reasonable results on NVidiA GeForce 670 at 1920×1080 for complex scenes with multiple-bounce diffuse effects, caustics, and glossy reflection in real-time. Across the designs we conclude that tiled, deferred photon gathering in a compute shader gives the best combination of performance and quality. © 2013 acm.

关键词： graphics processing unit

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FasTC: Accelerated fixed-rate texture encoding 13

FasTC: Accelerated fixed-rate texture encoding

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17th acm siggraph symposium on interactive 3d graphics and games, i3d 2013

作者： Krajcevski, Pavel Lake, Adam Manocha, dinesh University of North Carolina Chapel Hill United States Intel Corporation United States

ISBN: (纸本)9781450319560

We present a new algorithm for encoding low dynamic range images into fixed-rate texture compression formats. Our approach provides orders of magnitude improvements in speed over existing publicly-available compressors, while generating high quality results. the algorithm is applicable to any fixed-rate texture encoding scheme based on Block Truncation Coding and we use it to compress images into the OpenGL BPTC format. the underlying technique uses an axis-aligned bounding box to estimate the proper partitioning of a texel block and performs a generalized cluster fit to compute the endpoint approximation. this approximation can be further refined using simulated annealing. the algorithm is inherently parallel and scales with the number of processor cores. We highlight its performance on low-frequency game textures and the high frequency Kodak Test image Suite. © 2013 acm.

关键词： graphics processing unit

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Texture brush: An interactive surface texturing interface 13

Texture brush: An interactive surface texturing interface

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17th acm siggraph symposium on interactive 3d graphics and games, i3d 2013

作者： Sun, Qian Zhang, Long Zhang, Minqi Ying, Xiang Xin, Shi-Qing Xia, Jiazhi He, Ying Nanyang Technological University Singapore Hangzhou Dianzi University China Ningbo University China Central South University China

ISBN: (纸本)9781450319560

this paper presents Texture Brush, an interactive interface for texturing 3d surfaces. We extend the conventional exponential map to a more general setting, in which the generator can be an arbitrary curve. Based on our extended exponential map, we develop a local parameterization method which naturally supports anisotropic texture mapping. With Texture Brush, the user can easily specify such local parameterization with a free-form stroke on the surface. We also propose a set of intuitive operations which are mainly based on 3d painting metaphor, including texture painting, texture cloning, texture animation design, and texture editing. Compared to the existing surface texturing techniques, our method enables a smoother and more natural work flow so that the user can focus on the design task itself without switching back and forth among different tools or stages. the encouraging experimental results and positive evaluation by artists demonstrate the efficacy of our Texture Brush for interactive texture mapping. © 2013 acm.

关键词： Mapping

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Fast global illumination for interactive volume visualization 13

Fast global illumination for interactive volume visualizatio...

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17th acm siggraph symposium on interactive 3d graphics and games, i3d 2013

作者： Zhang, Yubo Ma, Kwan-Liu UC Davis United States

ISBN: (纸本)9781450319560

High quality global illumination can enhance the visual perception of depth cue and local thickness of volumetric data but it is seldom used in scientific visualization because of its high computational cost. this paper presents a novel grid-based illumination technique which is specially designed and optimized for volume visualization purpose. it supports common light sources and dynamic transfer function editing. Our method models light propagation, including both absorption and scattering, in a volume using a convection-diffusion equation that can be solved numerically. the main advantage of such technique is that the light modeling and simulation can be separated, where we can use a unified partial-differential equation to model various illumination effects, and adopt highly-parallelized grid-based numerical schemes to solve it. Results show that our method can achieve high quality volume illumination with dynamic color and opacity mapping and various light sources in real-time. the added illumination effects can greatly enhance the visual perception of spatial structures of volume data. © 2013 acm.

关键词： Volume rendering

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interactive mesostructures 13

Interactive mesostructures

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17th acm siggraph symposium on interactive 3d graphics and games, i3d 2013

作者： Nykl, Scott Mourning, Chad Chelberg, david School of Electrical Engineering and Computer Science Ohio University United States

ISBN: (纸本)9781450319560

this paper presents a technique for interactively deforming and colliding with mesostructures at a per-texel level. it is compatible with a broad range of existing mesostructure rendering techniques including both safe and unsafe ray-height field intersection algorithms. this technique integrates well with existing physics engines and is able to reduce traditional 3d geometrical deformations (vertex-based) to 2d image space operations (pixel-based) that are parallelized on a GPU without CPU-GPU data shuffling. Additionally, surface and material properties may be specified at a per-texel level enabling a mesostructure to possess varying attributes intrinsic to its surface and collision behavior;furthermore, this offers an image-based alternative to traditional decals. this technique provides a simple way to make almost every surface in a virtual world responsive to user actions and events. it requires no preprocessing time and storage requirements of one additional texture or less. the algorithm uses existing displacement map algorithms as well as existing physics engines and can be easily incorporated into new or existing game pipelines. © 2013 acm.

关键词： deformation

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Fast percentage closer soft shadows using temporal coherence 13

Fast percentage closer soft shadows using temporal coherence

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17th acm siggraph symposium on interactive 3d graphics and games, i3d 2013

作者： Schwärzler, Michael Luksch, Christian Scherzer, daniel Wimmer, Michael VRVis Research Center Austria Max-Planck-Institut für Informatik Germany Vienna University of Technology Austria

ISBN: (纸本)9781450319560

We propose a novel way to efficiently calculate soft shadows in real-time applications by overcoming the high computational effort involved with the complex corresponding visibility estimation each frame: We exploit the temporal coherence prevalent in typical scene movement, making the estimation of a new shadow value only necessary whenever regions are newly disoccluded due to camera adjustment, or the shadow situation changes due to object movement. By extending the typical shadow mapping algorithm by an additional light-weight buffer for the tracking of dynamic scene objects, we can robustly and efficiently detect all screen space fragments that need to be updated, including not only the moving objects themselves, but also the soft shadows they cast. By applying this strategy to the popular Percentage Closer Soft Shadow algorithm (PCSS), we double rendering performance in scenes with both static and dynamic objects - as prevalent in various 3d game levels - while maintaining the visual quality of the original approach. © 2013 acm.

关键词： three dimensional computer graphics

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Flip-flop: Convex hull construction via star-shaped polyhedron in 3d 13

Flip-flop: Convex hull construction via star-shaped polyhedr...

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17th acm siggraph symposium on interactive 3d graphics and games, i3d 2013

作者： Gao, Mingcen Cao, thanh-Tung Tan, Tiow-Seng Huang, Zhiyong National University of Singapore Singapore Institute for Infocomm Research A-STAR Singapore

ISBN: (纸本)9781450319560

Flipping is a local and efficient operation to construct the convex hull in an incremental fashion. However, it is known that the traditional flip algorithm is not able to compute the convex hull when applied to a polyhedron in R3. Our novel Flip-Flop algorithm is a variant of the flip algorithm. it overcomes the deficiency of the traditional one to always compute the convex hull of a given star-shaped polyhedron with provable correctness. Applying this to construct convex hull of a point set in R3, we develop ffHull, a flip algorithm that allows nonrestrictive insertion of many vertices before any flipping of edges. this is unlike the well-known incremental fashion of strictly alternating between inserting a single vertex and flipping. the new approach is not only simpler and more efficient for CPU implementation but also maps well to the massively parallel nature of the modern GPU. As shown in our experiments, ffHull running on the CPU is as fast as the best-known convex hull implementation, qHull. As for the GPU, ffHull also outperforms all known prior work. From this, we further obtain the first known solution to computing the 2d regular triangulation on the GPU. © 2013 acm.

关键词： Flip flop circuits

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symposium chair message

Symposium chair message

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iEEE symposium on 3d User interfaces (3dUi)

作者： Anatole Lécuyer Frank Steinicke Mark Billinghurst INRIA France University of Wuerzburg Germany University of Canterbury New Zealand

Welcome to the iEEE symposium on 3d User interfaces 2013 (3dUi 2013), taking place in Orlando, Florida, on March 16th–17th, 2013. the symposium is co-located with iEEE Virtual Reality 2013 and the acm symposium on interactive 3d graphics and games 2013 (i3d 2013). 3dUi 2013 is the eighth international symposium focused on the topic of three-dimensional user interfaces. Although a recent area of research, 3dUi is already a very well established topic and rapidly expanding. this area has emerged from many different disciplines, including virtual, augmented, and mixed reality, human-computer interaction, computer graphics, cognitive and perceptual psychology, and 3d games.

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