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Interactive global illumination in dynamic environments using commodity graphics hardware

Interactive global illumination in dynamic environments usin...

引用

pacific conference on computer graphics and applications

作者： M. Nijasure S. Pattanaik V. Goel University of Central Florida Orlando FL USA ATI Research Orlando FL USA

We present a system based on commodity graphics hardware for computing global illumination in dynamic scenes at interactive rates. We designed a progressive global illumination algorithm specifically to take advantage of current graphics hardware features. Our algorithm simulates the transport of light in synthetic environments by following the light emitted from the light source(s) through its multiple bounces on the surfaces of the scene. The entire algorithm runs on ATI's Radeon 9700 using vertex and fragment shaders, allowing us to compute and display a global illumination solution for reasonably complex scenes with moving objects and moving lights in approximately 250 milliseconds (4 frames per second).

关键词： Lighting graphics Hardware Layout Optical reflection Computational modeling Rendering (computer graphics) Interpolation Data structures Approximation algorithms

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Using texture synthesis for non-photorealistic shading from paint samples

Using texture synthesis for non-photorealistic shading from ...

引用

pacific conference on computer graphics and applications

作者： C.D. Kulla J.D. Tucek R.J. Bailey C.M. Grimm Washington University Saint Louis USA

This paper presents several methods for shading meshes from scanned paint samples that represent dark to light transitions. Our techniques emphasize artistic control of brush stroke texture and color. We first demonstrate how the texture of the paint sample can be separated from its color gradient. We demonstrate three methods, two real-time and one off-line, for producing rendered, shaded images from the texture samples. All three techniques use texture synthesis to generate additional paint samples. Finally, we develop metrics for evaluating how well each method achieves our goal in terms of texture similarity, shading correctness and temporal coherence.

关键词： Paints Rendering (computer graphics) computer graphics Animation Painting Strips Nonlinear distortion Shape Brushes Application software

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Enhancing silhouette-based human motion capture with 3D motion fields

Enhancing silhouette-based human motion capture with 3D moti...

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pacific conference on computer graphics and applications

作者： C. Theobalt J. Carranza M.A. Magnor Max-Planck-Institut für Informatik Saarbrücken Germany

High-quality nonintrusive human motion capture is necessary for acquisition of model-based free-viewpoint video of human actors. Silhouette-based approaches have demonstrated that they are able to accurately recover a large range of human motion from multiview video. However, they fail to make use of all available information, specifically that of texture information. This paper presents an algorithm that uses motion fields constructed from optical flow in multiview video sequences. The use of motion fields augments the silhouette-based method by incorporating texture-information into the tracking process. The algorithm is a key-component in a larger free-viewpoint video system of human actors. Our results demonstrate that our method accurately estimates pose parameters and allows for realistic texture generation in 3D video sequences.

关键词： Humans Parameter estimation Image motion analysis computer graphics computer vision Motion estimation Video sequences Tracking Rendering (computer graphics) Image generation

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Feature-based visibility-driven CLOD for terrain

Feature-based visibility-driven CLOD for terrain

引用

pacific conference on computer graphics and applications

作者： Sheng Li Xuehui Liu Enhua Wu Laboratory of Computer Science Institute of Software of Chinese Academy of Sciences Beijing China Department of Computer and Information Science University of Macau Macao China

ISBN: (纸本)0769520286

View-dependent level-of-detail (LOD) and visibility culling are two powerful tools for accelerating the rendering of very large models in a real-time visualization, especially in walkthrough of a large-scale terrain environment. In this paper, we propose a visibility-driven Continuous LOD (CLOD) framework for terrain, which takes advantage of both techniques. The visibility determination is based on the well-known occlusion horizon algorithm. By making use of the features of the terrain extracted in pre-processing stage, a new cascading occlusion culling (COC) algorithm is proposed to cull those regions classified as invisible to current viewpoint in real time. The time consumption and storage overheads that we spend on visibility preprocessing are quite small. Visibility-driven CLOD enhances culling efficiency and improves the frame rates significantly for walkthrough of a terrain environment.

关键词： Large-scale systems computer graphics Layout Acceleration Rendering (computer graphics) Aerospace simulation Feature extraction computer science Software tools Information science

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RGVis: region growing based techniques for volume visualization

RGVis: region growing based techniques for volume visualizat...

引用

pacific conference on computer graphics and applications

作者： Runzhen Huang Kwan-Liu Ma Department of Computer Science University of California Davis USA Department of Computer Science University of California슠Davis USA

ISBN: (纸本)0769520286

Interactive data visualization is inherently an iterative trial-and-error process searching for an ideal set of parameters for classifying and rendering features of interest in the data. This paper presents 3-d region growing based techniques that can assist the users to locate and define features of interest in volume data more quickly and more accurately. One technique employs partial region growing to generate a 2-d transfer function that effectively reveals the full features of interest. The other technique uses the result of full region growing to systematically construct a boundary surface for the extracted features. The resulting polygonal representation of the boundary surface can facilitate comparison, measurement, and simulation. A visual assessment method is suggested by using the extracted volume and surface information. These techniques either shorten or completely eliminate the typical trial-and-error step in the process of interactive data exploration.

关键词： Data visualization Rendering (computer graphics) Transfer functions computer graphics Data mining Hardware Scattering computer science Feature extraction Medical simulation

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High-quality point-based rendering on modern GPUs

High-quality point-based rendering on modern GPUs

引用

pacific conference on computer graphics and applications

作者： M. Botsch L. Kobbelt Computer Graphics Group RWTH Aachen Germany

In the last years, point-based rendering has been shown to offer the potential to outperform traditional triangle based rendering both in speed and visual quality when it comes to processing highly complex models. Existing surface splatting techniques achieve superior visual quality by proper filtering but they are still limited in rendering speed. On the other hand the increasing availability and programmability of graphics hardware lead to the development of very efficient hardware-accelerated rendering methods. However, since no filtered splats are used, these approaches trade visual quality for rendering speed. In this paper, we propose a rendering framework for point-based geometry providing high visual quality as well as efficient rendering. Our approach is based on a two-pass splatting technique with Gaussian filtering, resulting in a visual quality comparable to existing software rendering systems. Using programmable graphics hardware we delegate all expensive rendering tasks to the GPU, thereby minimizing data transfer and saving CPU resources. The proposed system renders up to 28M mid-quality or up to 10M high-quality surface splats per second on the latest graphics hardware.

关键词： Rendering (computer graphics) Hardware computer graphics Geometry Filtering Pipelines Filters Bioreactors Central Processing Unit Software quality

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An enhanced framework for real-time hair animation

An enhanced framework for real-time hair animation

引用

pacific conference on computer graphics and applications

作者： Wenqi Liang Zhiyong Huang Department of Computer Science School of Computing National University of Singapore Singapore

ISBN: (纸本)0769520286

Maximizing visual effect is a major problem in real-time animation. A real-time hair animation framework was proposed previously by C. K. Koh and Z. Huang (2000, 2001) based on 2D representation and texture mapping. One problem is that it lacks of the volumetric effect due to its 2D nature. This paper presents a technique using the U-shape strip to solve the problem.

关键词： Hair Animation Strips Visual effects Shape Spline Surface topography Surface reconstruction Humans Fluid dynamics

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Interactive visualization of complex real-world light sources

Interactive visualization of complex real-world light source...

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pacific conference on computer graphics and applications

作者： X. Granier M. Goesele W. Heidrich H.-P. Seidel University of British Columbia Vancouver Canada MPI Informatik Saarbrucken Germany

Interactive visualization of complex, real-world light sources has so far not been feasible. We present a hardware accelerated direct lighting algorithm based on a recent high quality light source acquisition technique. By introducing an approximate reconstruction of the exact model, a multi-pass rendering approach, and a compact data representation, we are able to achieve interactive frame rates. The method is part of the processing pipeline from light source acquisition to high quality lighting of a virtual world.

关键词： Light sources Data visualization Hardware Rendering (computer graphics) Lighting Optical filters Acceleration Image reconstruction Pipelines Optical feedback

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Iso-splatting: a point-based alternative to isosurface visualization

Iso-splatting: a point-based alternative to isosurface visua...

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pacific conference on computer graphics and applications

作者： C.S. Co B. Hamann K.I. Joy Center for Image Processing and Integrated Computing (CIPIC) Department of Computer Science University of California USA

We present a new approach to isosurface visualization that we call "iso-splatting." We use point primitives for representing and rendering isosurfaces. The method consists of two steps. In the first step, point samples are generated throughout the volumetric domain of a scalar function. In the second step, these points are projected onto the isosurface of interest. We render the resulting point set using a surface splatting algorithm. The method can be extended to out-of-core or parallel environments. Our results show that this method can offer much greater time and space efficiency when compared with standard triangle-based methods, thereby supporting higher levels of interactivity. Parts of the algorithm can be accelerated using graphics hardware. One key advantage of this approach is that, since extraction computations are divided into two smaller phases, work can be distributed to exploit all available resources.

关键词： Isosurfaces Visualization Rendering (computer graphics) Computational geometry Fuels Image processing computer science Acceleration graphics Hardware

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Neural meshes: statistical learning based on normals

Neural meshes: statistical learning based on normals

引用

pacific conference on computer graphics and applications

作者： W.-K. Jeong I.P. Ivrissimtzis H.-P. Seidel MPI Informatik University of Utah Saarbrucken Germany MPI Informatik Saarbrucken Germany

ISBN: (纸本)0769520286

We present a method for the adaptive reconstruction of a surface directly from an unorganized point cloud. The algorithm is based on an incrementally expanding neural network and the statistical analysis of its learning process. In particular, we make use of the simple observation that during the learning process the normal of a vertex near a sharp edge or a high curvature area of the target space, statistically, will vary more than the normal of a vertex near a flat area. We use the information obtained from the study of these normal variations to steer the learning process in an adaptive meshing application, producing meshes with more triangles near the high curvature areas. The same information is used in a feature detection application.

关键词： Statistical learning Neural networks Application software Surface reconstruction Clouds computer graphics Geometry Reconstruction algorithms Statistical analysis computer vision

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