11th Pacific Conference onComputer Graphics and Applications, 2003. Proceedings.

8-10 Oct. 2003

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  • Proceedings 11th Pacific Conference on Computer Graphics and Applications

    Publication Year: 2003
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The following topics are dealt with: appearance and rendering; geometric modeling; 3D acquisition and interactive modeling; nonphotorealistic rendering; computer animation; morphing, shadow, and simulation; mesh; geometric computing and visibility; point-based rendering; and techniques for volume and mesh. View full abstract»

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  • Realistic rendering of surface appearance using GPU

    Publication Year: 2003
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (171 KB) | HTML iconHTML

    Summary form only given. We present techniques for realistic modeling surface details and efficient rendering of the associated visual effects using programmable GPUs. An important topic in rendering surface appearance is the treatment of mesostructures, which are responsible for fine-scale shadowing, occlusion, inter-reflectance, and silhouettes. One way to model surface mesostructure is by using... View full abstract»

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  • Machine learning for computer graphics: a manifesto and tutorial

    Publication Year: 2003, Page(s):22 - 36
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (334 KB) | HTML iconHTML

    It is argued that computer graphics can benefit from a deeper use of machine learning techniques. The author gives an overview of what learning has to offer the graphics community, with an emphasis on Bayesian techniques. He also attempts to address some misconceptions about learning, and to give a very brief tutorial on Bayesian reasoning. View full abstract»

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  • Freeform shape representations for efficient geometry processing

    Publication Year: 2003
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (170 KB) | HTML iconHTML

    Summary form only given. The most important concepts for the handling and storage of freeform shapes in geometry processing applications are parametric representations and volumetric representations. Both have their specific advantages and drawbacks. While the algebraic complexity of volumetric representations is independent from the shape complexity, the domain of a parametric representation usua... View full abstract»

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  • Data-driven computer graphics

    Publication Year: 2003
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB) | HTML iconHTML

    Summary form only given. The field of computer graphics abounds with modeling and simulation problems. Among these are the representation of surface shape, the description of surface reflectance, the probabilistic modeling of small-scale variations, and the application of physics for simulating the dynamics of rigid and elastic materials. During its formative years, computer graphics has focused l... View full abstract»

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  • Author index

    Publication Year: 2003, Page(s):513 - 514
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    Freely Available from IEEE
  • Enhancing silhouette-based human motion capture with 3D motion fields

    Publication Year: 2003, Page(s):185 - 193
    Cited by:  Papers (10)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB) | HTML iconHTML

    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 algori... View full abstract»

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  • Depth-peeling for texture-based volume rendering

    Publication Year: 2003, Page(s):429 - 433
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (603 KB) | HTML iconHTML

    We present the concept of volumetric depth-peeling. The proposed method is conceived to render interior and exterior iso-surfaces for a fixed iso-value and to blend them without the need to render the volume multiple times. The main advantage of our method over pre-integrated volume rendering is the ability to extract arbitrarily many iso-layers for the given iso-value. Up to now, pre-integrated v... View full abstract»

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  • Skinning Catmull-Clark subdivision surfaces with incompatible cross-sectional curves

    Publication Year: 2003, Page(s):102 - 111
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5960 KB) | HTML iconHTML

    One of the major problems in the generation of skinning B-spline surfaces is the incompatibility of the cross-sectional curves. This occurs when the cross sections are defined by control polygons having different number of control devices. Traditionally, this incompatibility is overcome by knot insertion that makes all control polygons have equal number of vertices. The drawback of this solution i... View full abstract»

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  • Computer-assisted auto coloring by region matching

    Publication Year: 2003, Page(s):175 - 184
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (513 KB) | HTML iconHTML

    Computer-assisted auto coloring (CAAC) has great potential in terms of lowering production cost and saving time in cel animation production. In this paper, a novel approach to automatically color the animation character of line drawings based on region matching and master frames is proposed. Firstly, some important attributes of a region such as curve length, character points, area etc. are invest... View full abstract»

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  • A painting interface for interactive surface deformations

    Publication Year: 2003, Page(s):141 - 150
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1019 KB) | HTML iconHTML

    A long-standing challenge in geometric modeling is providing a natural, intuitive interface for making local deformations to 3D surfaces. Previous approaches have provided either interactive manipulation or physical simulation to control surface deformations. In this paper, we investigate combining these two approaches with a painting interface that gives the user direct, local control over a phys... View full abstract»

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  • Butterworth filtering and implicit fairing of irregular meshes

    Publication Year: 2003, Page(s):502 - 506
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (323 KB) | HTML iconHTML

    In this paper, we propose efficient numerical techniques for Butterworth filtering and implicit fairing of large irregular triangle meshes, where the corresponding filters are rational polynomials and the resulting large linear systems need to be solved iteratively. We show that significant speed-up can be achieved for Butterworth filtering by factorizing the linear system in the complex domain. A... View full abstract»

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  • OPENNPAR: a system for developing, programming, and designing non-photorealistic animation and rendering

    Publication Year: 2003, Page(s):424 - 428
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (641 KB) | HTML iconHTML

    The notable amount and variation of current techniques in non-photorealistic rendering (NPR) indicates a level of maturity whereby the categorization of algorithms has become possible. We present a conceptual model for NPR, on which we base a modular system, OPENNPAR, which integrates NPR algorithms into distinct classes. Components in OPENNPAR are modularized and consequently reintegrated for var... View full abstract»

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  • G2 blending of corners with piecewise algebraic surfaces

    Publication Year: 2003, Page(s):93 - 101
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (327 KB) | HTML iconHTML

    In this paper, we present a construction approach to blend the corner of three coordinate planes with G2 continuous piecewise algebraic surfaces. For each pair of two coordinate planes, an algebraic surface patch (which is defined in a tetrahedron or a prism) is used to blend the two coordinate planes, and then a center patch is constructed to blend the three algebraic surface patches. ... View full abstract»

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  • A fast finite element solution for cloth modelling

    Publication Year: 2003, Page(s):244 - 251
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB) | HTML iconHTML

    We present an efficient model based on finite elements for viscoelastic, highly flexible surfaces. It is particularly designed for numerically stiff materials such as textiles because it yields linear equations in each time step and allows fast time stepping in an implicit integration method. This is achieved by reducing the nonlinear elasticity problem to a planar, linear one in each step. We app... View full abstract»

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  • Particle-based visual simulation of explosive flames

    Publication Year: 2003, Page(s):482 - 486
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (570 KB) | HTML iconHTML

    In the present paper, we propose a particle-based method for the visual simulation of explosive flames. This method consists of a numerical simulation method based on a fluid model described by discrete Lagrangian using particles and a rendering method for generating a CG animation from the movement data of the particles. This fluid model uses flame particles and air particles. The model calculate... View full abstract»

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

    Publication Year: 2003, Page(s):325 - 334
    Cited by:  Papers (9)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (731 KB) | HTML iconHTML

    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 se... View full abstract»

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  • Simulating wax crayons

    Publication Year: 2003, Page(s):163 - 172
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB) | HTML iconHTML

    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... View full abstract»

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  • Interactive volume illustration and feature halos

    Publication Year: 2003, Page(s):347 - 354
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1190 KB) | HTML iconHTML

    Volume illustration is a developing trend in volume visualization, focused on conveying volume information effectively by enhancing interesting features of the volume and omitting insignificant data. However, the calculations involved have limited the illustration process to non-interactive rendering. We have developed a new interactive volume illustration system (IVIS) that harnesses the power of... View full abstract»

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  • Neural meshes: statistical learning based on normals

    Publication Year: 2003, Page(s):404 - 408
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB) | HTML iconHTML

    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... View full abstract»

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  • From a closed piecewise geodesic to a constriction on a closed triangulated surface

    Publication Year: 2003, Page(s):394 - 398
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (575 KB) | HTML iconHTML

    Constrictions on a surface are defined as simple closed curves whose length is locally minimal. In particular, constrictions are periodic geodesics. We use constrictions in order to segment objects. In [4], we proposed an approach based on progressive surface simplification and local geodesic computation. The drawback of this approach is that constrictions are approximated by closed piecewise geod... View full abstract»

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  • Interactive global and local deformations for virtual clay

    Publication Year: 2003, Page(s):131 - 140
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (459 KB) | HTML iconHTML

    Making virtual modeling as easy and intuitive as real-clay manipulation is still an unsolved problem. This paper takes a step in this direction: in addition to offering standard features such as addition and removal of material, it uses a new real-time plasticity model to let the user apply local and global deformations such as those made in real clay by pressing with a finger or bending a sculptu... View full abstract»

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  • Voxelization in common sampling lattices

    Publication Year: 2003, Page(s):497 - 501
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (466 KB) | HTML iconHTML

    In this paper, we introduce algorithms to voxelize polygonal meshes in common sampling lattices. In the case of Cartesian lattices, we complete the separability and minimality proof for the voxelization method presented by Huang et al. We extend the ideas to general 2D lattices, including hexagonal lattices, and 3D body-centred cubic lattices. The notion of connectedness in the two lattice structu... View full abstract»

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  • A state machine for real-time cutting of tetrahedral meshes

    Publication Year: 2003, Page(s):377 - 386
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2625 KB) | HTML iconHTML

    We introduce an algorithm that consistently and accurately processes arbitrary intersections in tetrahedral meshes in real-time. The intersection surfaces are modeled up to the current cut tool position at every point in time. Tetrahedra are subdivided by using a progressive method, which inserts the required sub-structures step by step. A state machine tracks the topology of each tetrahedron and ... View full abstract»

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  • Combining topological simplification and topology preserving compression for 2D vector fields

    Publication Year: 2003, Page(s):419 - 423
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB) | HTML iconHTML

    Topological simplification techniques and topology preserving compression approaches for 2D vector fields have been developed quite independently of each other. In this paper we propose a combination of both approaches: a vector field should be compressed in such a way that its important topological features (both critical points and separatrices) are preserved while its unimportant features are a... View full abstract»

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