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Efficient processing of large 3D meshes

Efficient processing of large 3D meshes

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pacific conference on computer graphics and applications

作者： H.-P. Seidel Max Planck Institute of Computer Science Saarbrucken Germany

Summary form only given, as follows. Due to their simplicity, triangle meshes are often used to represent geometric surfaces. Their main drawback is the large number of triangles that are required to represent a smooth surface. This problem has been addressed by a large number of mesh simplification algorithms which reduce the number of triangles and approximate the initial mesh. Hierarchical triangle mesh representations provide access to a triangle mesh at a desired resolution, without omitting any information. The article presents an infrastructure for discrete geometry processing, including algorithms for 3D reconstruction, curvature computation, reverse engineering, mesh reduction, interactive multiresolution modeling and progressive transmission of arbitrary unstructured triangle meshes.

关键词： computer science Computational geometry Solid modeling

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Control of feature-point-driven facial animation using a hypothetical face

Control of feature-point-driven facial animation using a hyp...

引用

pacific conference on computer graphics and applications

作者： Ming-Shing Su Ming-Tat Ko Kuo-Young Cheng Institute of Information Science Academia Sinica Taiwan Department of Computer Science and Information Engineering National Taiwan University Taiwan

ISBN: (纸本)0769508685

A new approach for the generation of feature point-driven facial animation is presented. This approach is based on the construction of a hypothetical face formed by connecting face feature points into a net and representing each facet of the net by a mathematically expressed surface to control the deformation of a real face model. The deformation is controlled by changing both the locations of the feature points and their tangents. The experimental results show that the hypothetical-surface-based method can generate almost identical facial expressions to a real face.

关键词： Facial animation Face recognition Bandwidth Deformable models Teleconferencing Information science computer science Joining processes MPEG 4 Standard Control systems

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An automatic modeling method for fitting volumetric objects with metacubes

An automatic modeling method for fitting volumetric objects ...

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pacific conference on computer graphics and applications

作者： Eun-Seok Kim Jay Jeong Kim Department of Computer Science Chonnam National University Kwangju South Korea

ISBN: (纸本)0769508685

Implicit modeling is an important technique in the modeling of informal objects. However, the available automatic modeling algorithms with implicit skeletal elements are not very advanced. In this paper, we propose a new skeletal element, called a metacube, and an automatic modeling technique for informal objects represented by volumetric data. The metacube has the merits of a metaball and also enhances the modeling ability of informal objects containing planar surfaces. For a 256/spl times/256/spl times/256 size of input volume, the proposed method takes a short generation time (less than ten minutes) on an SGI Indigo 2 workstation.

关键词： Isosurfaces Deformable models Shape computer science Workstations Surface fitting Ray tracing Data mining

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Triangular Bezier clipping

Triangular Bezier clipping

引用

pacific conference on computer graphics and applications

作者： S.H.M. Roth P. Diezi M.H. Gross Computer Science Department Swiss Federal Institute of Technology Zurich Switzerland

Introduces a new approach to finding ray-patch intersections with triangular Bernstein-Bezier patches of arbitrary degree. Unlike the approach of *** (1998), which was based on a combination of hierarchical subdivision and a Newton-like iteration scheme, this work extends the concept of Bezier clipping to the triangular domain. The problem of reporting wrong intersections, which was inherent to the original Bezier clipping algorithm of T. Nishita et al. (1990), is investigated and opposed to the triangular case. It turns out that reporting wrong hits is very improbable, even close to impossible, in the triangular setup.

关键词： Ray tracing Tensile stress computer science Paper technology Slabs Chebyshev approximation Polynomials Equations Upper bound

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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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Collision detection for clothed human animation

Collision detection for clothed human animation

引用

pacific conference on computer graphics and applications

作者： Dongliang Zhang M.M.F. Yuen CAD\CAM Center Hong Kong University of Science and Technology Hong Kong China

ISBN: (纸本)0769508685

We present a voxel-based collision detection method for clothed human animation. We speed up the performance of the voxel-based method by choosing an appropriate voxel size and using a fast voxelization approach. Based on the voxel method, we propose a self-collision detection method and a simplified collision detection method. First, the efficiency of self-collision detection is improved by taking advantage of the curvature and multi-layer methods. Second, the efficiency of cloth/human collision detection is improved by introducing auxiliary line segments. Some heuristics are provided to further increase the efficiency of collision detection. Experimental results demonstrate that our method is efficient for clothed human animation.

关键词： Humans Animation Biological system modeling Computational modeling Computational geometry Computational efficiency Detection algorithms Design automation computer graphics Robots

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Efficient coding of non-triangular mesh connectivity

Efficient coding of non-triangular mesh connectivity

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pacific conference on computer graphics and applications

作者： B. Kronrod C. Gotsman Computer Science Department Technion-Israel Institute of Technology Haifa Israel

Describes an efficient algorithm for coding the connectivity information of general polygon meshes. In contrast to most existing algorithms, which are suitable only for triangular meshes and pay a penalty for the treatment of non-triangular faces, this algorithm codes the connectivity information in a direct manner. Our treatment of the special case of triangular meshes is shown to be equivalent to the Edgebreaker algorithm. Using our methods, any triangle mesh may be coded in no more than two bits/triangle (approximately four bits/vertex), a quadrilateral mesh in no more than 3.5 bits/quad (approximately 3.5 bits/vertex), and the most common case of a quadrilateral mesh with few triangles in no more than four bits/polygon.

关键词： computer science Algorithm design and analysis Surgery Decoding Upper bound

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Intuitive virtual grasping for non haptic environments

Intuitive virtual grasping for non haptic environments

引用

pacific conference on computer graphics and applications

作者： T. Ullmann J. Sauer Department of Computer Science and Automation Computer Graphics Program Technical University Ilmenau Ilmenau Germany Commercial Vehicle Development DaimlerChrysler Aerospace Sindelfingen Germany Virtual Reality Competence Center Daimler Chrysler Research and Technology Center Ulm Germany

This paper presents an approach for grasping virtual objects in virtual environments with a data glove. Our focus lies on developing new methods that allow sensible realistic grasping gestures which correspond to human grasping behavior. To meet the demands of industrial applications, users must be able to grasp an object in an intuitive way with one or two hands and, beyond that, manipulate grasped objects between their fingers. To avoid the use of expensive force or touch feedback hardware, but also to ensure a safe grip on virtual objects, several forms of visual feedback are provided. First, we describe the basic algorithm for grasping with one or two hands and finally, we present a method to precisely manipulate the grasped objects between the virtual fingers.

关键词： Grasping Haptic interfaces Data gloves Virtual reality Virtual environment Fingers Force feedback Hardware Application software Engines

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Progressive geometry compression for meshes

Progressive geometry compression for meshes

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pacific conference on computer graphics and applications

作者： Xinguo Liu Hujun Bao PhengAnn Heng TienTsin Wong Hanqiu Sun Qunsheng Peng State Key Laboratory of CAD&CG University of Zhejiang China Department of Computer Science and Engineering Chinese University of Hong Kong Hong Kong China

ISBN: (纸本)0769508685

A novel progressive geometry compression scheme is presented in this paper. In this scheme, a mesh is represented as a base mesh followed by some groups of vertex split operations using an improved simplification method in which each level of the mesh can be refined into the next level by carrying out a group of vertex split operations in any order. Consequently, the progressive mesh (PM) representation can be effectively encoded by permuting the vertex split operations in each group. Meanwhile, a geometry predictor using the Laplacian operator is designed to predict each new vertex position using its neighbours. The correction is quantized and encoded using a Huffman coding scheme. Experimental results show that our algorithm obtains higher compression ratios than previous work. It is very suitable for the progressive transmission of geometric models over the Internet.

关键词： Solid modeling Computational geometry Internet Information geometry computer science Laplace equations Huffman coding computer graphics Application software Bandwidth

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Arbitrary precise orientation specification for layout of text

Arbitrary precise orientation specification for layout of te...

引用

pacific conference on computer graphics and applications

作者： T. Surazhsky G. Elber Applied Mathematics Department Technion-Israel Institute of Technology Haifa Israel Faculty of Computer Science Technion-Israel Institute of Technology Haifa Israel

A novel method for the layout of text strings over some given free-form parametric base curves is considered. Each letter of the string is represented by a collection of cubic and linear Bezier curves. The layout of the string over the free-form parametric curve is derived as a symbolic composition of the string geometry (i.e. a sequence of Bezier curves) and a free-form parametric surface S(u, v) with the parameters u, v between zero and one, and S(u, 0) given by the base curve. This method has proven to provide great flexibility and give high quality results in layout of text.

关键词： Shape Vectors Application software Animation Printing Packaging Design automation Humans Parametric statistics Spline

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