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Shape Modeling and Applications, 1999. Proceedings. Shape Modeling International '99. International Conference on

1-4 March 1999

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Displaying Results 1 - 25 of 35
  • Proceedings Shape Modeling International '99. International Conference on Shape Modeling and Applications

    Publication Year: 1999
    Request permission for commercial reuse | PDF file iconPDF (167 KB)
    Freely Available from IEEE
  • Table of contents

    Publication Year: 1999, Page(s):v - vii
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    Freely Available from IEEE
  • Index of authors

    Publication Year: 1999, Page(s): 281
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    Freely Available from IEEE
  • Multi-layer implicit garment models

    Publication Year: 1999, Page(s):66 - 71, 271
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    Presents a new way to model clothing worn by articulated implicit characters. A scalar field is produced using ellipsoids as primitives. Isosurfaces are then used to place garments in one or more layers. As each implicit surface is independent, collision detection is not needed. The cloth is a polygonal mesh whose vertices are in turn moved towards their destination isosurface using the gradient o... View full abstract»

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  • Interactive shape design with convolution surfaces

    Publication Year: 1999, Page(s):56 - 65, 270
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    This paper presents a complete design environment that explores the modeling capabilities of convolution surfaces and puts them into practice. The design system includes a number of implicit primitives and modeling techniques that allow objects to be created by sculpting their surfaces at all levels of detail. All the techniques are illustrated using models of marine life forms and other objects o... View full abstract»

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  • Shape control using primitive decompositions

    Publication Year: 1999, Page(s):50 - 55, 268-9
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Presents novel techniques to modify free-form shapes defined by implicit algebraic models. These models are first simplified by introducing a decomposition in terms of conic-line primitives, and then the desired local/global shape changes are produced by varying the parameters of these primitives. A decomposed model provides efficient control of each primitive using its canonical frame. To make th... View full abstract»

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  • Interactive design of smooth genus n objects over a single domain

    Publication Year: 1999, Page(s):10 - 17, 266
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    Recently, there have been some developments in constructing infinitely smooth genus-n objects over a single domain using the so-called topological design method. Compared with existing geometric design methods, it provides many advantages: a simpler data structure, a compact data set and infinite continuity. Improvement in the user interface, however, is still needed for designing free-form genus-... View full abstract»

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  • Cylindrical coordinate representations for modeling surfaces of the cornea and contact lenses

    Publication Year: 1999, Page(s):98 - 113, 273
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5280 KB)

    The paper develops four alternatives for modeling surfaces of the cornea and contact lenses. The cornea and contact lenses are generally smooth surfaces with possible discontinuities in circumferential or radial patterns. We define surfaces derived from semi-regular tensor product B-spline surfaces over a polar coordinate domain. The semi-regular partition allows finer control over the patch size,... View full abstract»

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  • Skeletal methods of shape manipulation

    Publication Year: 1999, Page(s):44 - 47, 267
    Cited by:  Papers (18)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (96 KB)

    The geometric skeleton is derived from a static object using an implicit `directions' method; an IK skeleton is derived from and used to manipulate the geometric skeleton. The model may be reconstructed from the modified skeleton using implicit distance and convolution methods View full abstract»

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  • Computational shape modeling: valid vs. invalid

    Publication Year: 1999, Page(s):2 - 7
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    A computationally valid shape model has been sought so that we can share shapes among varied applications for extensive reuse. Current shape models are targeted at presentations and lack validity in their shape properties, such as topological, geometrical and visual equivalence. Based on cellular structured space modeling (cellular modeling for short), valid shape modeling is formulated and exampl... View full abstract»

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  • Variational constraints in 3D

    Publication Year: 1999, Page(s):90 - 97
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    Geometric constraint solving is an integral part of computer aided design, serving the role both of precisely situating geometric elements in relation to each other, as well as dimensioning and constraining their shapes accurately. We discuss how to solve variational constraint problems involving points, lines and planes. We concentrate on small problems that must be solved simultaneously View full abstract»

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  • Computational topology for shape modeling

    Publication Year: 1999, Page(s):36 - 43
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    Expands the role of the new field of computational topology by surveying methods for incorporating connectedness in shape modeling. Two geometric representations in particular-recurrent models and implicit surfaces-can (often unpredictably) become connected or disconnected based on typical changes in modeling parameters. Two methodologies for controlling connectedness are identified: connectedness... View full abstract»

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  • Extended constrained deformations: a new sculpturing tool

    Publication Year: 1999, Page(s):219 - 224
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    Modelling tools tend to virtual sculpturing, in which a basic object is deformed by user supplied actions. The model we present aims to be generic: whatever the geometric description of the object, we can deform it to satisfy location constraints. Our model deforms the whole space, the image of a point is a blend of deformation functions with a projection matrix which allows the satisfaction of th... View full abstract»

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  • Shape analysis using high-performance computing techniques

    Publication Year: 1999, Page(s):248 - 255
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Shape understanding and modelling are complex procedures, which are the result of different specific processes. Generally, many steps in these processes may require a high computational-effort, thus making the use of parallel processing an interesting possibility. A typical example is feature recognition, a key tool towards shape understanding, which is applied to detect either local or region-wid... View full abstract»

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  • Extracting skeletal curves from 3D scattered data

    Publication Year: 1999, Page(s):194 - 201
    Cited by:  Papers (7)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    We introduce a method for extracting skeletal curves from an unorganized collection of scattered data points lying on a surface. These curves may have a tree like structure to capture branching shapes such as blood vessels. The skeletal curves can be used for different applications ranging from surface reconstruction to object recognition View full abstract»

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  • Automatic knot placement by a genetic algorithm for data fitting with a spline

    Publication Year: 1999, Page(s):162 - 169
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1756 KB)

    In order to obtain a good spline model from many measurement data, frequently we have to deal with bets as variables. Then the problem to be solved becomes a continuous nonlinear and multivariate optimization problem with many local optima. Therefore, it is difficult to obtain a global optimum. We propose a new method to convert the original problem into a discrete combinatorial optimization probl... View full abstract»

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  • Generalized distance functions

    Publication Year: 1999, Page(s):72 - 79
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    We obtain a generalized version of the well-known distance function family Lp norm. We prove that the new functions satisfy distance function properties. By using these functions, convex symmetric shapes can be described as loci, the set of points which are in equal distance from a given point. We also show that these symmetric convex shapes can be easily parameterized. We also show the... View full abstract»

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  • Guaranteeing 2-manifold property for meshes

    Publication Year: 1999, Page(s):18 - 25
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1180 KB)

    Meshes are the most commonly used objects in computer graphics. They generalize polyhedra by using non-planar faces. Modeling 2D manifold meshes with a simple user interface is an important problem in computer-aided geometric design. In this paper, we propose a conceptual framework for mesh modeling systems that guarantees topologically correct 2D manifolds. Our solution is based on graph rotation... View full abstract»

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  • On reconstruction of surfaces from their apparent contours and the stationary phase observations

    Publication Year: 1999, Page(s):116 - 120
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (100 KB)

    The main results of the paper concern a classical problem: if two surfaces in the Euclidean space have congruent projections on any plane, how different can they be? We consider the apparent contours of the smooth hypersurfaces as the projection data and formulate some sufficient conditions of coincidence of the shapes of two hypersurfaces, if the shapes of their apparent contours on any 2-dimensi... View full abstract»

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  • Shape signature by deformation

    Publication Year: 1999, Page(s):225 - 232, 279
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    A method for shape comparison is presented using shape deformation. Unlike many other approaches to shape similarity which use local characteristics such as curvature, our approach captures global features of the shapes being compared and is less sensitive to uneven noise. The problem is cast into polygon-to-polygon deformation (i.e., homotopic deformation) and a new shape signature is introduced ... View full abstract»

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  • Modeling of surfaces with fair reflection line pattern

    Publication Year: 1999, Page(s):256 - 263
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Inspection of reflection line patterns is a standard way to check the quality of free form surfaces. In this paper, we describe an approach which enables the designer to control during the modeling process the reflection line pattern by approximating a specified family of reflection lines. Our method directly operates on the commonly used B-spline format, and produces fair surfaces. The approach i... View full abstract»

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  • Merging polyhedral shapes with scattered features

    Publication Year: 1999, Page(s):202 - 210, 278
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (908 KB)

    The paper presents a technique for merging two genus 0 polyhedra. Merging establishes correspondences between vertices of the models as a first step in a 3D morphing process. The technique allows for the specification of scattered features to be aligned. This is accomplished by performing the following three steps: First, initial embeddings of the polyhedra on unit spheres are computed. Second, th... View full abstract»

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  • Elastodynamic shape modeling in virtual medicine

    Publication Year: 1999, Page(s):172 - 178, 276
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2624 KB)

    Surgical simulation is the coming training method for medical education. The main reasons for this are the reduced risk for the patients and the easy repeatability of complicated surgical procedures. Therefore, an improved impression of reality during the simulated training must be obtained. For this, a complex model of the human's anatomy and physiology is needed. With regards to pathological con... View full abstract»

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  • Modeling and deformation method of human body model based on range data

    Publication Year: 1999, Page(s):80 - 87, 272
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    A cloth simulation system must generate a human body model based on measured data obtained from range data. We propose modeling and deformation methods based on such data. In our system, the human body is modeled by layered metaballs which correspond to the horizontal cross-section of the body. For each cross-section, metaballs are generated by measured sample points on the boundary of the cross-s... View full abstract»

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  • The algorithm for automatic cutting of three-dimensional polyhedrons of h-genus

    Publication Year: 1999, Page(s):26 - 33
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    An algorithm for automatically reducing the topology of an h-genus 3D polyhedron to the topology of a sphere is proposed. The polyhedron is assumed to be represented by a 3D cell complex. A special technique for separating the 2D sub-complexes producing the cutting surfaces is described. This technique is based on the calculation of the Betti groups of the polyhedron View full abstract»

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