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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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  • 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
  • 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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  • 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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  • 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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  • An algorithm for interpolating intersecting curves by recursive subdivision surfaces

    Publication Year: 1999, Page(s):130 - 137, 274
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    Interpolation conditions on recursive subdivision surfaces provide more powerful techniques to manipulate such surfaces. Recently, such conditions were extended to handle interpolation of pre-defined curves by a subdivision surface. Given a curve Ci defined by a control polygon cp0, this consists of constructing a strip complex Pi as part of the defining polyhedral... 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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  • Inverse problem in geometrical modeling of the sources of medical signals

    Publication Year: 1999, Page(s):179 - 185, 277
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    Some applications of geometrical modeling for biomedical signal processing are discussed. A new model of the heart nervous conductive system, used previously for the direct electrogram problem, is used now to solve the inverse problem. Geometrical modeling can give an approximate estimation of the source position and strength, even if the available amount of data is not sufficient for a correct ma... 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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  • Free-form shape modeling by 3D cellular automata

    Publication Year: 1999, Page(s):242 - 247
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    Modeling free-form shapes in a 3D space is one of the difficult problems in computer graphics. In a parametric patch, intuitive control of free-form shapes is not easy. Modeling methods based on strict physical laws need considerable computation time to deform objects, which are not suitable for interactive applications. In this paper we focus on a cellular automaton and try to apply it to interac... 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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  • Intersecting surfaces of special types

    Publication Year: 1999, Page(s):122 - 128
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1384 KB)

    The paper reviews new approaches to computing the intersection curve of two surfaces of special types. We consider algorithms for intersecting a torus with a natural quadric or another torus. After that, we review a topological technique that computes the intersection curve of a sphere and a surface of revolution. Finally, we consider the intersection of two ruled surfaces 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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  • Geometrical analysis of two sets of 3D correspondence data patterns

    Publication Year: 1999, Page(s):211 - 218
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    Given two sets of image correspondence data, the analysis of the corresponding rigid body transformation that accurately describes the object's motion in 3D space is a fundamental problem in image understanding. While many methods have been put forward to analyse 3D transformations, such methods do not make use of the vector distance between feature points and angular information as constraints to... View full abstract»

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  • Elastodynamic shape modeling in virtual medicine

    Publication Year: 1999, Page(s):172 - 178, 276
    Cited by:  Papers (4)
    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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  • 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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  • Voxel volumes volume-oriented visualization system

    Publication Year: 1999, Page(s):234 - 241, 280
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    High-speed and effective algorithm of volume rendering is proposed. New methods of object representation by using unified freeforms and arbitrary algebraic surfaces are suggested as well. Proposed algorithm allows to lower complexity of computations, memory and bandwidth requirements in comparison with known methods. The prototyping of hardware system allows operating in real-time with high-qualit... View full abstract»

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  • Alpha-spline: a C2 continuous spline with weights and tension control

    Publication Year: 1999, Page(s):138 - 145, 275
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2320 KB)

    The β-spline provides bins and tension control facilities for creating geometrically continuous curves and surfaces. Although geometric continuity is a more appropriate geometric measurement of smoothness than parametric continuity, parametric continuity is still necessary in some applications. The paper proposes a new C2 continuous spline scheme called the α-spline which pro... View full abstract»

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  • Modeling material behavior: molecular dynamics simulation and visualization

    Publication Year: 1999, Page(s):186 - 191
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    We have developed atomic-scale material models capable of melting, crystallization and amorphization. These deformable models feature molecular dynamics governed by Langevin equations of motion in which particles interact through attractive covalent forces and short-range repulsion forces. Also, we present an interactive virtual visualization tool for the simulation of atomic scale material behavi... 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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  • 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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  • 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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  • 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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  • Nonlinear spline generation with curve evolutions driven by curvature

    Publication Year: 1999, Page(s):146 - 153
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    The paper develops a method to design nonlinear splines on a plane via curve evolutions driven by curvature. We consider a curve passing through two given end points and satisfying prescribed boundary conditions at them (for example, curvature values or tangent directions are specified at the end points). Each point of the curve moves in the normal direction with speed equal to a function of the c... View full abstract»

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