Computer Graphics and Applications, 1998. Pacific Graphics '98. Sixth Pacific Conference on

26-29 Oct. 1998

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  • Proceedings Pacific Graphics '98. Sixth Pacific Conference on Computer Graphics and Applications (Cat. No.98EX208)

    Publication Year: 1998
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    Freely Available from IEEE
  • Graphics with shape property inheritance

    Publication Year: 1998, Page(s):2 - 6
    Cited by:  Papers (9)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (875 KB)

    Current graphics models suffer from inconsistencies in many ways. Neither homotopical nor topological properties have been inherited in the shapes of graphical objects in particular, and usually continuity and singularity properties are not inherited either. For example, since the most of the shape modeling in computer graphics has polygonalization as the underlying display structures and data str... View full abstract»

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  • Adaptive hierarchical b-spline surface approximation of large-scale scattered data

    Publication Year: 1998, Page(s):8 - 16
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (195 KB)

    A fast algorithm for large scale scattered data approximation is described. The algorithm exploits a coarse-to-fine hierarchical control lattice to fit the scattered data. In this algorithm, the refinement process is only located in the regions where the error between the scattered data and the resulting surface is greater than a specified tolerance. A recursive algorithm is used to find these reg... View full abstract»

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  • Tight bounding volumes for subdivision surfaces

    Publication Year: 1998, Page(s):17 - 26
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    We first demonstrate how to compute exact limit points and tangents for surfaces generated by an arbitrary, stationary subdivision scheme. We then describe how to construct simple bounding volumes for the patches of a subdivision surface and present a simple numerical technique to compute guaranteed bounds for the ranges of the basis functions being associated with the subdivision scheme. Merging ... View full abstract»

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  • Fair curve and surface design system using tangent control

    Publication Year: 1998, Page(s):27 - 36
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (674 KB)

    The paper proposes a generation system of unit quarternion curves and surfaces to design fair curves and surfaces. Curvature and variation of curvature are the primary factors that determine the quality of fair curves and surfaces; however not so many methods have been explored to directly manipulate them, especially in three dimensional space. We use unit quaternion curves in integral forms to sp... View full abstract»

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  • General matrix representations for B-splines

    Publication Year: 1998, Page(s):37 - 43
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    The concept of basis matrix of B-splines is presented. A general matrix representation, which results in an explicitly recursive matrix formula, for nonuniform B-spline curves of an arbitrary degree is also presented by means of Toeplitz matrix. New recursive matrix representations for uniform B-spline curves and Bezier curves of an arbitrary degree are obtained as special cases of that for nonuni... View full abstract»

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  • Toward urban model acquisition from geo-located images

    Publication Year: 1998, Page(s):45 - 51
    Cited by:  Papers (8)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (403 KB)

    High fidelity textured geometric models are a fundamental starting point for computer graphics, simulation, visualization, design, and analysis. Existing tools for acquiring 3D models of large scale (e.g., urban) geometry, from imagery, require significant manual input and suffer other algorithmic scaling limitations. We are pursuing a research and engineering effort to develop a novel sensor and ... View full abstract»

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  • Modeling of clouds from satellite images using metaballs

    Publication Year: 1998, Page(s):53 - 60
    Cited by:  Papers (8)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (198 KB)

    The paper proposes an image based modeling of clouds where realistic clouds are created from satellite images using metaballs. The intention of the paper is for applications to space flight simulators, the visualization of the weather information, and the simulation of surveys of the Earth. In the proposed method, the density distribution inside the clouds is defined by a set of metaballs. Paramet... View full abstract»

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  • Nonlinear view interpolation

    Publication Year: 1998, Page(s):61 - 69
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (417 KB)

    A new nonlinear view interpolation algorithm is presented. Unlike the linear interpolation scheme, our method can exactly simulate the perspective viewing transformation during the walkthrough. To accelerate the view interpolation, the algorithm employs a binary subdivision scheme to optimize the decomposition of the source image so that the number of the resultant blocks is greatly reduced. Holes... View full abstract»

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  • Efficient image-based rendering of volume data

    Publication Year: 1998, Page(s):70 - 78
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    The paper presents an efficient image based rendering algorithm of volume data. Using intermediate image space instead of image space, mapping becomes more efficient and holes coming from the point-to-point mapping can be removed. Mapping in intermediate image space is easily performed by looking up the table with the depth value of a source pixel. We also suggest a way of minimizing space require... View full abstract»

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  • An analytical ray casting of volume data

    Publication Year: 1998, Page(s):79 - 86
    Cited by:  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (219 KB)

    When volume data is visualized by the ray casting method, the color value of each pixel in the image is obtained by composing the color contributions of the sample points that lie on the ray cast from the pixel point. In most ray tracing methods, including M. Levoy's (1988; 1990) classical method, the color composition is formulated as a summation of the color contributions of the discrete sample ... View full abstract»

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  • Bounded clustering-finding good bounds on clustered light transport

    Publication Year: 1998, Page(s):87 - 96
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (239 KB)

    Clustering is a very efficient technique to apply finite element methods to the computation of radiosity solutions of complex scenes. Both computation time and memory consumption can be reduced dramatically by grouping the primitives of the input scene into a hierarchy of clusters and allowing for light exchange between all levels of this hierarchy. However, problems can arise due to clustering, w... View full abstract»

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  • An efficient shadow algorithm for area light sources using BSP trees

    Publication Year: 1998, Page(s):97 - 103
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (57 KB)

    The paper presents a fast algorithm for computing shadow volumes of area light sources and performing shadow classification. The algorithm improves Chin and Feiner's method (N. Chin and S. Feiner, 1992) in the way that it does not subdivide an area light source before the processing of scene polygons. Instead, a light source is only subdivided when needed and is merged immediately when the need va... View full abstract»

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  • Shape space from deformation

    Publication Year: 1998, Page(s):104 - 113
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The construction of shape spaces is studied from a mathematical and a computational viewpoint. A program is outlined, reducing the problem to four tasks: the representation of geometry, the canonical deformation of geometry, the measuring of distance in shape space, and the selection of base shapes. The technical part of the paper focuses on the second task: the specification of a deformation mixi... View full abstract»

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  • General constrained deformations based on generalized metaballs

    Publication Year: 1998, Page(s):115 - 124
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (941 KB)

    Space deformation is an important tool in computer animation and shape design. We propose a new local deformation model based on generalized metaballs. The user specifies a series of constraints, which can be made up of points, lines, surfaces and volumes, their effective radii and maximum displacements; the deformation model creates a generalized metaball for each constraint. Each generalized met... View full abstract»

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  • RECODE: an image-based collision detection algorithm

    Publication Year: 1998, Page(s):125 - 133
    Cited by:  Papers (7)  |  Patents (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    Object interactions are ubiquitous in interactive computer graphics, 3D object motion simulations, virtual reality and robotics applications. Most collision detection algorithms are based on geometrical object space interference tests. Some algorithms have employed an image space approach to the collision detection problem. We demonstrate an image space collision detection process that allows subs... View full abstract»

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  • A nondeterministic reconstruction approach for isotropic reflectances and transmittances

    Publication Year: 1998, Page(s):134 - 139
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (80 KB)

    Physically and biologically based reflectance and transmittance models add realism to image synthesis applications at the expense of a significant increase in rendering time. Current research efforts in this area focus on developing practical solutions to quickly access a BDF (which represents a combination of BRDF and BTDF) while preserving its original characteristics. An approach to reconstruct... View full abstract»

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  • Image Talk: a real time synthetic talking head using one single image with Chinese text-to-speech capability

    Publication Year: 1998, Page(s):140 - 148
    Cited by:  Papers (5)  |  Patents (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (390 KB)

    Image Talk uses a single image to automatically create talking sequences in real time. The image can be acquired from a photograph, video clip, or hand drawn characters. This interactive system accepts Chinese text and talks back in Mandarin Chinese, generating facial expression in real time. Image Talk analyzes Chinese text by converting it to a standard Pinyin system used in Taiwan and fetches t... View full abstract»

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  • Design and implementation of the Maya Renderer

    Publication Year: 1998, Page(s):150 - 159
    Cited by:  Papers (3)  |  Patents (8)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (139 KB)

    Maya is the new 3D software package recently released by Alias I Wavefront for creating state of the art character animation and visual effects. Built on a next generation advanced architecture, Maya delivers high speed interaction and high productivity for its users. In the Fall of 1995, the Rendering Team at Alias/Wavefront started from scratch to design and implement a renderer for the Maya pro... View full abstract»

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  • Gesticulation behaviors for virtual humans

    Publication Year: 1998, Page(s):161 - 168
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (421 KB)

    Gesture and speech are two very important behaviors for virtual humans. They are not isolated from each other but generally employed simultaneously in the service of the same intention. An underlying PaT-Net parallel finite state machine may be used to coordinate them both. Gesture selection is not arbitrary. Typical movements correlated with specific textual elements are used to select and produc... View full abstract»

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  • An efficient control over human running animation with extension of planar hopper model

    Publication Year: 1998, Page(s):169 - 176
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (373 KB)

    The most important goal of character animation is to efficiently control the motions of a character. Until now, many techniques have been proposed for human gait animation, and some techniques have been created to control the emotions in gaits such as "tired walking" and "brisk walking" by using parameter interpolation or motion data mapping. Since it is very difficult to automate the control over... View full abstract»

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  • Dust and water splashing models for hopping figures

    Publication Year: 1998, Page(s):177 - 186
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    To enhance the realism of computer animation sequences, the interaction between autonomous creatures and their environment needs to be modeled. Two such commonly occurring phenomena, dust and water splashing on impact, are presented. These pseudo dynamic models, based on particle system concepts, are designed for hoppers with approximately elliptical bases. The proposed models can be extended for ... View full abstract»

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  • Interactive mesh dragging with adaptive remeshing technique

    Publication Year: 1998, Page(s):188 - 197
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    We propose a 3D mesh dragging method useful for intuitive, efficient geometric modeling of free form polygonal models. With our method, the user can drag a part of a triangular mesh and change its position and orientation. This method is based on an adaptive remeshing procedure which evaluates the deformation of faces by dragging and properly modifies them by deleting or splitting with local topol... View full abstract»

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  • A camera control interface based on the visualization of subspaces of the 6D motion space of the camera

    Publication Year: 1998, Page(s):198 - 206
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (227 KB)

    The paper describes a camera control interface for the exploration of 3D virtual space implemented by using a 2D input device, a joystick. The interface uses a helicopter maneuver metaphor: the viewpoint of the virtual camera is controlled as if the user sits in a helicopter and controls its motion. To control the helicopter by a 2D input device, the 6D space of the helicopter motion is decomposed... View full abstract»

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  • An infrared image synthesis model

    Publication Year: 1998, Page(s):208 - 209
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (17 KB)

    The paper proposes an infrared image synthesis model based on infrared physics and heat transfer. The model successfully reproduces the infrared images of the object under different viewing, ambient and internal conditions. Experimental examples illustrate the potential of our method. View full abstract»

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