Proceedings of 1997 International Conference on Shape Modeling and Applications

6-6 March 1997

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  • Proceedings of 1997 International Conference on Shape Modeling and Applications

    Publication Year: 1997
    Request permission for commercial reuse | PDF file iconPDF (184 KB)
    Freely Available from IEEE
  • Topological modelling of disordered cellular structures

    Publication Year: 1997, Page(s):2 - 9
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (733 KB)

    The authors model the structure of space-filling disordered cellular systems. These systems are cellular networks with minimum incidence numbers (D+1 edges incident on a vertex in D-dimension). In the literature such systems are known as froths since the soap froth is the archetype of these structures. They present a method where the structure of froths is analyzed as organized in concentric layer... View full abstract»

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  • On cutting a torus

    Publication Year: 1997, Page(s):10 - 14
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    Methods are presented for cutting the surface of a polygonal shape that is homeomorphic to the torus. A number of issues are discussed as to how to find loops of a desired characteristic on the surface of a polyhedrally-defined torus and how to cut the torus into two parts by using the loops discovered. A method for finding a homeomorphism for toroidal surfaces is also described, which is importan... View full abstract»

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  • Shape abstraction tools for modeling complex objects

    Publication Year: 1997, Page(s):16 - 25
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1573 KB)

    Shape is a very important way of perceiving and reasoning about the world. The authors introduce some considerations about shape representation and abstraction tools and their interaction with analysis and synthesis processes. A generic architecture for shape-based modelling is also outlined. The concepts discussed in the first part of the article are also exemplified through the description of so... View full abstract»

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  • Bezier normal vector surface and its applications

    Publication Year: 1997, Page(s):26 - 35
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1049 KB)

    One of the essential properties of a surface is its normal vector. Many applications, i.e., surface rendering, surface-surface intersection, and offset surface generation, require normal vectors. A normal vector at a point on a tensor product surface is usually obtained by taking a cross product of the two partial derivatives. The paper discusses a Bezier normal vector surface which is a locus of ... View full abstract»

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  • Towards a generic editor for subdivision surfaces

    Publication Year: 1997, Page(s):37 - 46
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1796 KB)

    Subdivision surfaces are defined by a mesh of points and by one or more refinement rules that substitute new, larger subsets of points for existing subsets to yield refined meshes. The refinement rules defining a subdivision surface are known collectively as the refinement process defining the surface. Refinement processes of interest are any for which the successively refined meshes can be shown ... View full abstract»

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  • Spline interpolation with genetic algorithms

    Publication Year: 1997, Page(s):47 - 54
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (771 KB)

    A general framework is set up for the application of genetic algorithms in curve design. Then, within this scheme, the problem of spline interpolation-a frequently used method for representing complex geometrical shapes in CAD/CAM systems-is dealt with. While the method itself is simple and robust, it suffers from the drawback that some parameters must be given that are needed for the mathematical... View full abstract»

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  • Freehand sketch system for 3D geometric modelling

    Publication Year: 1997, Page(s):55 - 62
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    The paper introduces a new method to deal with sketches for inputting geometric models at a workstation. The sketches are drawn on a CRT screen through a stylus pencil and a tablet by a designer at an early stage in the design procedure. The designer can keep the drawing stylus at a workstation as the same manner as using a pen on paper. The system 'Sketch Interpreter' can correct geometric models... View full abstract»

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  • The 3D revolution: CAD access for all!

    Publication Year: 1997, Page(s):64 - 70
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (790 KB)

    The manufacturing industry has invested vast amounts of resources in the deployment and use of solid modeling technology. Although expensive to generate and potentially very valuable in many product related activities, 3D models have rarely been exploited to support product management, documentation, collaborative review, and promotion, because they were only accessible to trained designers equipp... View full abstract»

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  • Ten questions that arose in designing the Djinn API for solid modelling

    Publication Year: 1997, Page(s):71 - 76
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (555 KB)

    Djinn is an API for solid modelling which is defined in the language of point-sets and is thus independent of any particular modelling data-structure (e.g. boundary representations or CSG trees). In designing this API, several significant and interesting questions have arisen, including: the basic feasibility of the approach; deciding how to support cellular models; providing facilities for naviga... View full abstract»

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  • A multiple-view CAD representation for product modelling

    Publication Year: 1997, Page(s):78 - 85
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1320 KB)

    With the advent of concurrent engineering (CE), the engineering product design process has changed substantially. Different factors of the product life cycle, such as the manufacturing process, part assembly and quality control, can now all be simultaneously involved in the design phase. To achieve CE traditional computer-aided design systems are inadequate. Co-operative product design needs more ... View full abstract»

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  • Context dependent extraction of volumetric features

    Publication Year: 1997, Page(s):86 - 95
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2373 KB)

    As entities for describing products, features are commonly conceived as being of a semantically higher level than the purely geometric elements traditionally used in CAD systems. Thus, they constitute an effective means for the designer and process planner to consider objects in terms of entities that are meaningful for their activities. The greatest difficulty in using feature technology is the d... View full abstract»

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  • Efficient shape-based algorithms for modeling patient specific anatomy from 3D medical images: applications in virtual endoscopy and surgery

    Publication Year: 1997, Page(s):97 - 108
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3538 KB)

    Virtual reality environments provide highly interactive, natural control of the visualization process, significantly enhancing the scientific value of the data produced by medical imaging systems. Due to the computational and real-time display update requirements of virtual reality interfaces, the complexity of organ and tissue surfaces which can be displayed is limited. In this paper, we present ... View full abstract»

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  • Two shape metrics for biomedical outline data: bending energy, Procrustes distance, and the biometrical modeling of shape phenomena

    Publication Year: 1997, Page(s):110 - 120
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1121 KB)

    Quantitative studies of shapes in the real world are often expedited by the tools of morphometrics, a branch of multivariate statistics organized to exploit the origin of such data in real Euclidean geometry. This paper reviews one such tool that has recently been designed for the analysis of corresponding biological outlines of similar shape, such as those that arise from organ or tissue boundari... View full abstract»

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  • Visual modeling of stomach growth on the basis of L-systems

    Publication Year: 1997, Page(s):121 - 128
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (877 KB)

    A parametric L-system (Lindenmayer system) is developed to model the growth and structure changes of human stomach over the time starting in the third week and going on into week four of human embryo development. The model takes into account what is known about embryo movement during growth. The framework uses the formalism of L-systems with constructs that are dependent on time and smooth growth ... View full abstract»

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  • Geometrical cloning of 3D objects via simultaneous registration of multiple range images

    Publication Year: 1997, Page(s):130 - 139
    Cited by:  Papers (39)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1303 KB)

    Presents a method for the reconstruction of real-world objects from multiple range images. One major contribution of our approach is the simultaneous registration of all range images acquired from different scanner views. Thus, registration errors are not accumulated, and it is even possible to reconstruct large objects from an arbitrary number of small range images. The registration process is ba... View full abstract»

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  • Shape integration of multi stereo images using surveyed points for an archaeological site

    Publication Year: 1997, Page(s):140 - 148
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1110 KB)

    Proposes a new method for reconstructing complete 3D shapes and colors of outdoor objects, especially of archaeological sites, as a reconstructed 3D image can be useful for archaeological research. The method integrates two kinds of data: (1) partial surfaces (inaccurate object surfaces with color information which are obtained by stereogrammetry, each of which has its local geometry fixed on the ... View full abstract»

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  • Hardware implementation of shading models in an application specific integrated circuit

    Publication Year: 1997, Page(s):150 - 159
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1760 KB)

    The Truga001 is a single chip rendering processor with 12 embedded graphics functions. Phong and bump mapped shading, reflection and reflection mapping, gaseous object rendering and video mapping are incorporated fully in hardware with a MIMD structure. Shaded and texture mapped pixels are rendered at 3.8 ns/pixel which is equivalent to 1.2 million triangle polygons (100 pixels/s) with hidden surf... View full abstract»

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  • Experimental study on acceleration of an exact-arithmetic geometric algorithm

    Publication Year: 1997, Page(s):160 - 168
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (791 KB)

    The paper presents a method for accelerating an exact arithmetic geometric algorithm. The exact arithmetic is one of the most promising approaches for making numerically robust geometric algorithms, because it enables us to always judge the topological structures of objects correctly and thus makes us free from inconsistency. However, exact arithmetic costs much more time than floating point arith... View full abstract»

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  • Recognizing three-dimensional shapes while measuring them

    Publication Year: 1997, Page(s):170 - 177
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (911 KB)

    The paper proposes a system that recognizes three dimensional (3D) objects while measuring them. The system consists of a liquid crystal (LC) projector and a video camera. Our system can be applied to moving objects. The system itself can also move while measuring the objects to obtain the data of a whole scene. In our system, range data is registered on the fly. View full abstract»

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  • Collaborative visualization and modeling

    Publication Year: 1997, Page(s):178 - 187
    Cited by:  Papers (4)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1281 KB)

    Rapid advances in computing hardware (workstations, PCs), infrastructure (networks, cable, telephone), product development software (geometric modeling, process simulations, graphics), and business models (emerging economies, international currency exchange) have provided the raw material to support true globalization of product development. This globalization in turn raises a strong need for memb... View full abstract»

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  • Fast algorithms for ridge detection

    Publication Year: 1997, Page(s):189 - 197
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (751 KB)

    We propose fast algorithms for the detection of view independent ridges on surfaces given by graphs of functions. The ridges are defined via extrema of the principal curvatures along the associated principal direction. These algorithms have the advantage to be fast and it appears that the so defined ridges deserve as a characteristic feature of the shape of the surface. Results on analytic surface... View full abstract»

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  • A unified surface smoothing scheme for automobile body shape modeling design

    Publication Year: 1997, Page(s):198 - 203
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (567 KB)

    A unified surface smoothing scheme is proposed to fit grid points, scatter points and boundary points, which are digitized from physical models with the Coordinate Measurement Machine, to smoothness parameter surfaces. A variety of curves and surfaces with different smoothness can be obtained with the aid of parameters such as approximation and smoothness weights, segment or patch numbers and the ... View full abstract»

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  • Warping as a modelling tool for CSG/implicit models

    Publication Year: 1997, Page(s):205 - 213
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1242 KB)

    Freeform deformations are useful for describing a class of complex motions within an animation system. Such deformations have been described using a generalization of parametric surfaces and their application to modeling is well documented. We present a method that can be applied to implicit surfaces which are defined as an iso surface around a set of skeletal elements. The resulting surface is ap... View full abstract»

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  • Homotopic shape deformation

    Publication Year: 1997, Page(s):215 - 225
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1546 KB)

    An image warping method is presented that deforms an image continuously without foldover while observing a given set of trajectories of feature elements. Any intermediate image during the morph is homeomorphic to the initial image and the morphing process is a homotopy. The method permits points, line segments, and polygons to be included as features in the image. Techniques are described to make ... View full abstract»

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