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Interactive caustics using local precomputed irradiance

Interactive caustics using local precomputed irradiance

引用

pacific conference on computer graphics and applications

作者： C. Wyman C. Hansen P. Shirley Department of Computer Science University of Iowa IA USA School of Computing University of Utah Salt Lake UT USA

Bright patterns of light focused via reflective or refractive objects onto matte surfaces are called "caustics". We present a method for rendering dynamic scenes with moving caustics at interactive rates. This technique requires some simplifying assumptions about caustic behavior allowing us to consider it a local spatial property which we sample in a preprocessing stage. Storing the caustic locally limits caustic rendering to a simple lookup. We examine a number of ways to represent this data, allowing us to trade between accuracy, storage, run time, and precomputation time.

关键词： Lighting Layout Focusing Cities and towns Optical refraction computer graphics Humans computer science Computational efficiency Surface texture

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View-dependent continuous level-of-detail rendering of terrain model

View-dependent continuous level-of-detail rendering of terra...

引用

pacific conference on computer graphics and applications

作者： Lujin Wang Zesheng Tang Department of Computer Science and Technology Tsinghua University China

ISBN: (纸本)0769508685

The level-of-detail modeling method is an effective approach for the interactive visualization of complex models. In this paper, we propose a hierarchical tree structure based on the fractal dimension to organize a 3D terrain mesh model and to realize view-dependent continuous level-of-detail rendering of terrain data with a restricted quadtree triangulation method. The total algorithm can be divided into two stages: pre-processing and rendering. In pre-processing, it builds an adaptive hierarchical structure by considering the flatness of the terrain surface evaluated by the fractal dimension. Then it can generate a triangular approximation mesh by dynamically determining preserved data points according to the view-related parameters and performing a restricted quadtree triangulation. Some experiments demonstrate that it is simple and efficient and can be used to support the interactive dynamic rendering of terrain models.

关键词： Fractals Tree data structures Rendering (computer graphics) Rough surfaces Surface roughness Mesh generation computer science Data visualization Virtual reality Digital elevation models

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Efficient multimedia database indexing using structural join index hierarchy 2nd

引用

2nd IEEE pacific-Rim conference on Multimedia, IEEE-PCM 2001

作者： Fung, Chi-Wai Li, Qing Department of Computing Institute of Vocational Education VTC Tsing Wun Road NT Hong Kong Department of Computer Science City University of Hong Kong Tat Chee Ave KLN Hong Kong

ISBN: (纸本)3540426809

In this paper, we introduce structural join index hierarchy (SJIH) indexing mechanisms that mimic the class composition hierarchy of the complex objects to provide direct access to multimedia objects and/or their component objects. A cost model for processing the queries and maintaining the indices is developed. A heuristic algorithm is designed to select appropriate indices to efficiently process a given set of multimedia queries. Through the use of a News-on-Demand example, we show that SJIH indexing mechanisms facilitate efficient query processing in multimedia applications. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Query processing

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Efficient rendering of local subsurface scattering

Efficient rendering of local subsurface scattering

引用

pacific conference on computer graphics and applications

作者： T. Mertens J. Kautz P. Bekaert F. Van Reeth H.-P. Seidel Limburgs Universitair Centrum Diepenbeek Belgium MPI Informatik Saarbrucken Germany

A novel approach is presented to efficiently render local subsurface scattering effects. We introduce an important sampling scheme for a practical subsurface scattering model. It leads to a simple and efficient rendering algorithm, which operates in image-space, and which is even amenable for implementation on graphics hardware. We demonstrate the applicability of our technique to the problem of skin rendering, for which the subsurface transport of light typically remains local. Our implementation shows that plausible images can be rendered interactively using hardware acceleration.

关键词： Light scattering Particle scattering Optical scattering Rendering (computer graphics) Hardware Skin computer graphics Monte Carlo methods Dairy products Optical reflection

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"Skeleton climbing": fast isosurfaces with fewer triangles

"Skeleton climbing": fast isosurfaces with fewer triangles

引用

pacific conference on computer graphics and applications

作者： T. Poston H.T. Nguyen Pheng-Ann Heng Tien-Tsin Wong CIeMed National University of Singapore Singapore Microcomputer Research Laboratories Intel Corporation Santa Clara USA Department of computer Sci & Engineering Chinese University of Hong Kong Hong Kong China

Skeleton climbing is an algorithm that builds triangulated isosurfaces in 3D grid data, more economically than marching cubes, and without the time penalty of current mesh decimation algorithms. Building the surface from its intersections with grid edges (1-skeleton), then faces (2-skeleton), then cubes (3-skeleton), treats the data in a uniform way; this allows a 25% reduction in the number of triangles produced, while still creating a true separating surface at similar speed.

关键词： Skeleton Isosurfaces Surface treatment Interpolation Microcomputers Grid computing Chromium computer graphics Computational geometry Solid modeling

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Papercraft Models using Generalized Cylinders

Papercraft Models using Generalized Cylinders

引用

pacific conference on computer graphics and applications

作者： Fady Massarwi Craig Gotsman Gershon Elber Technion-Israel Institute of Technology Israel

We introduce an algorithm for approximating a 2-manifold 3D mesh by a set of developable surfaces. Each developable surface is a generalized cylinder represented as a strip of triangles not necessarily taken from the original mesh. Our algorithm is automatic, creates easy-to-assemble pieces, and provides L_\alpha global error bounds. The approximation quality is controlled by a user-supplied parameter specifying the allowed Hausdorff distance between the input mesh and its piecewise-developable approximation. The strips generated by our algorithm may be parameterized to conform with the parameterization of the original mesh, if given, to facilitate texture mapping. We demonstrate this by physically assembling papercraft models from the strips generated by our algorithm when run on several polygonal 3D mesh data sets.

关键词： Strips Mesh generation Assembly Approximation algorithms Approximation error Topology computer graphics Application software Automatic control computer aided manufacturing

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A Simplified Plane-Parallel Scattering Model and Its Application to Hair Rendering

A Simplified Plane-Parallel Scattering Model and Its Applica...

引用

pacific conference on computer graphics and applications

作者： Mikio Shinya Mishio Shiraishi Yoshinori Dobashi Kei Iwasaki Tomoyuki Nishita Toho University Chiba Japan Hokkaido University Hokkaido Japan Wakayama University Wakayama Japan University of Tokyo Tokyo Japan

Fast computation of multiple light reflections and scattering among complex objects is very important in photo-realistic rendering. This paper applies the plane-parallel scattering theory to the rendering of densely distributed objects such as hairs. We propose a simplified plane-parallel model that has very simple analytic solutions. This allows us to deal with multiple scattering phenomena in hair under ambient and area light illumination. The model was successfully applied to hair rendering, and experiments demonstrated the efficiency of the proposed method.

关键词： Scattering Hair Rendering (computer graphics) Mathematical model Approximation methods Equations Materials

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Simulating wax crayons

Simulating wax crayons

引用

pacific conference on computer graphics and applications

作者： D. Rudolf D. Mould E. Neufeld Department of Computer Science University of Saskatchewan Canada

We present a physically-inspired model of wax crayons, which synthesizes drawings from collections of user-specified strokes. Paper is represented by a height-field texture, and a crayon is modeled with a 2D mask that evolves as it interacts with the paper. The amount of wax deposition is computed based on the crayon contact profile, contact force, and friction. Previously deposited wax is smeared by crayon action, based on wax softness and contact information. The distributed wax is rendered using a simplified Kubelka-Monk model, which approximates light transmittance and scattering effects.

关键词： Computational modeling Light scattering Shape Rendering (computer graphics) Image processing Geometry computer science Friction Petroleum Painting

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A practical and flexible tiled display system

A practical and flexible tiled display system

引用

pacific conference on computer graphics and applications

作者： M.S. Brown W.B. Seales Department of Computer Science Hong Kong University of Science and Technology Kowloon Hong Kong China Department of Computer Science University of Kentucky Lexington KY USA

computer graphics and high-resolution digital imagery are becoming increasingly pervasive in communities not traditionally associated with graphics. Commodity graphics cards and digital cameras, along with powerful modeling software, allow organizations such as libraries, museums, and small businesses to produce expressive and realistic computer generated imagery, far surpassing the capabilities of current desktop monitors. What remains elusive to these groups is access to affordable and easy to use large format display technology. We present a practical system for deploying flexible projector based tiled displays. Our framework integrates two key components: (1) self-calibrating display geometry with real-time geometric correction and (2) PC-based distributed rendering that supports an established graphics API. Our system's display geometry is easy to configure and reconfigure, accommodates casually tiled projectors and arbitrary display surfaces, and can be operational in a matter of minutes. In addition, the underlying distributed rendering architecture (WireGL) is transparent to existing OpenGL applications, requiring no custom APIs or re-compilation of existing OpenGL executables. In short, we present a practical and flexible low-cost tiled display system that is simple to deploy and easy to operate.

关键词： computer displays computer graphics Geometry Rendering (computer graphics) Digital images Digital cameras Power system modeling Software libraries Image generation Power generation

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Blending multiple polygonal shapes

Blending multiple polygonal shapes

引用

pacific conference on computer graphics and applications

作者： H. Johan T. Nishita University of Tokyo Japan

This paper presents a new method for smoothly blending among multiple polygonal shapes. The blended shape is computed as a weighted average of the input shapes. The weight of each input shape is allowed to vary across the shape. This feature increases the flexibility for controlling the local appearance of the blended shapes. Our method computes the blended shape hierarchically, starting from the coarse version of the shape and adding the details gradually. Several examples are shown to demonstrate the advantages of the proposed method.

关键词： Shape control Application software computer graphics Animation Product design Computational efficiency

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