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

Date 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
  • Free-form shape modeling by 3D cellular automata

    Publication Year: 1999, Page(s):242 - 247
    Cited by:  Papers (2)
    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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  • Variational constraints in 3D

    Publication Year: 1999, Page(s):90 - 97
    Cited by:  Papers (3)
    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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  • Extended constrained deformations: a new sculpturing tool

    Publication Year: 1999, Page(s):219 - 224
    Cited by:  Papers (1)
    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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  • Automatic knot placement by a genetic algorithm for data fitting with a spline

    Publication Year: 1999, Page(s):162 - 169
    Cited by:  Papers (13)
    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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  • 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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  • Elastodynamic shape modeling in virtual medicine

    Publication Year: 1999, Page(s):172 - 178, 276
    Cited by:  Papers (3)
    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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  • Merging polyhedral shapes with scattered features

    Publication Year: 1999, Page(s):202 - 210, 278
    Cited by:  Papers (5)
    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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  • 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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  • 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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  • Shape signature by deformation

    Publication Year: 1999, Page(s):225 - 232, 279
    Cited by:  Papers (1)  |  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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  • 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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  • 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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  • 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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  • Multi-layer implicit garment models

    Publication Year: 1999, Page(s):66 - 71, 271
    Cited by:  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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  • Generalized distance functions

    Publication Year: 1999, Page(s):72 - 79
    Cited by:  Papers (1)
    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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  • 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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  • 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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  • Generalization of an interpolant using Voronoi diagrams in two directions

    Publication Year: 1999, Page(s):154 - 161
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    Recently the authors found a local coordinate property based on the planar Voronoi diagram that is simpler than the famous Sibson's local coordinates (R. Sibson, 1980; 1981), and proposed an interpolant using this property. The paper generalizes this property to general dimensions. The proof given in the paper enables us to use more general Voronoi diagrams, e.g., Laguerre Voronoi diagrams and num... 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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  • Interactive shape design with convolution surfaces

    Publication Year: 1999, Page(s):56 - 65, 270
    Cited by:  Papers (8)
    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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  • Skeletal methods of shape manipulation

    Publication Year: 1999, Page(s):44 - 47, 267
    Cited by:  Papers (12)  |  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 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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