Eurographics Partner Events: Recent submissions

Now showing items 1381-1400 of 2371

    • Handling Degeneracies in Exact Boundary Evaluation 

      Ouchi, K.; Keyser, J. (The Eurographics Association, 2004)
      We present a method for dealing with degenerate situations in an exact boundary evaluation system. We describe the possible degeneracies that can arise and how to detect them. We then present a numeric perturbation method ...

    • Euler Operators for Stratified Objects with Incomplete Boundaries 

      Gomes, A. J. P. (The Eurographics Association, 2004)
      Stratified objects such as those found in geometry-based systems (e.g. CAD systems and animation systems) can be stepwise constructed and manipulated through Euler operators. The operators proposed in this paper extend ...

    • Using Cayley Menger Determinants 

      Michelucci, D.; Foufou, S. (The Eurographics Association, 2004)
      We use Cayley-Menger Determinants (CMDs) to obtain an intrinsic formulation of geometric constraints. First, we show that classical CMDs are very convenient to solve the Stewart platform problem. Second, issues like distances ...

    • Compression, Segmentation, and Modeling of Filamentary Volumetric Data 

      McCormick, B.; Busse, B.; Doddapaneni, P.; Melek, Z.; Keyser, J. (The Eurographics Association, 2004)
      We present a data structure for the representation of filamentary volumetric data, called the L-block. While the L-block can be used to represent arbitrary volume data sets, it is particularly geared towards representing ...

    • Plumber: A Multi-scale Decomposition of 3D Shapes into Tubular Primitives and Bodies 

      Mortara, M.; Patane, G.; Spagnuolo, M.; Falcidieno, B.; Rossignac, J. (The Eurographics Association, 2004)
      Plumber is a specialized shape classi cation method for detecting tubular features of 3D objects represented by a triangle mesh. The Plumber algorithm segments a surface into connected components that are either body parts ...

    • Contour Interpolation with Bounded Dihedral Angles 

      Bereg, S.; Jiang, M.; Zhu, B. (The Eurographics Association, 2004)
      In this paper, we present the first nontrivial theoretical bound on the quality of the 3D solids generated by any contour interpolation method. Given two arbitrary parallel contour slices with n vertices in 3D, let a be ...

    • History Based Reactive Objects for Immersive CAD 

      Convard, T.; Bourdot, P. (The Eurographics Association, 2004)
      Virtual Environments (VE) allow direct 3D interaction, better perception of shapes and a feel of immersion, properties that are highly desirable for design tasks. Traditional CAD software extensively use WIMP interfaces ...

    • Shortest Circuits with Given Homotopy in a Constellation 

      Michelucci, D.; Neveu, M. (The Eurographics Association, 2004)
      Abstract A polynomial method is described for computing the shortest circuit with a prescribed homotopy on a surface. The surface is not described by a mesh but by a constellation: a set of sampling points. Points close ...

    • Shape Similarity Measurement Using Ray Distances for Mass Customization 

      Hwang, T. J.; Lee, K.; Jeong, J. H.; Oh, H. Y. (The Eurographics Association, 2004)
      Custom-tailored products are defined as products having various sizes and shapes tailored to meet the customer's different tastes or needs. Thus fabrication of custom-tailored products inherently involves inefficiency. To ...

    • Physics-based Modelling and Simulation of Functional Cloth for Virtual Prototyping Applications 

      Fontana, M.; Rizzi, C.; Cugini, U. (The Eurographics Association, 2004)
      A CAD-oriented system is proposed for the design of complex-shaped functional cloth, provided with a physics-based modelling core for simulation and virtual prototyping tasks. Textiles are physically modelled as particle ...

    • 3D Discrete Skeleton Generation by Wave Propagation on PR-Octree for Finite Element Mesh Sizing 

      Quadros, W. R.; Shimada, K.; Owen, S. J. (The Eurographics Association, 2004)
      This paper proposes a new algorithm to generate a disconnected, three-dimensional (3D) skeleton and an application of such a skeleton to generate a finite element (FE) mesh sizing function of a solid. The mesh sizing ...

    • Topological and Geometric Beautification of Reverse Engineered Geometric Models 

      Langbein, F. C.; Marshall, A. D.; Martin, R. R.; Mills, B. I.; Gao, C. H. (The Eurographics Association, 2004)
      Boundary representation models reverse engineered from 3D range data suffer from various inaccuracies caused by noise in the measured data and the model building software. Beauti cation aims to improve such models in a ...

    • Reconstruction with 3D Geometric Bilateral Filter 

      Miropolsky, A.; Fischer, A. (The Eurographics Association, 2004)
      In recent years, reverse engineering (RE) techniques have been developed for surface reconstruction from 3D scanned data. Typical sampling data, however, usually is large scale and contains unorganized points, thus leading ...

    • Integrated Feature-Based and Geometric CAD Data Exchange 

      Spitz, S. N.; Rappoport, A. (The Eurographics Association, 2004)
      Data exchange between CAD systems is an extremely important solid modeling concept, fundamental both for the theory of the field and for its practical applications. The two main data exchange (DE) paradigms are geometric ...

    • Tracing Surface Intersection with a Validated ODE System Solver 

      Mukundan, H.; Ko, K. H.; Maekawa, T.; Sakkalis, T.; Patrikalakis, N. M. (The Eurographics Association, 2004)
      This paper presents a robust method for tracing intersection curve segments between continuous rational parametric surfaces, typically rational polynomial parametric surface patches. The tracing procedure is based on a ...

    • Constraint-based Design of B-spline Surfaces from Curves 

      Michalik, P.; Bruderlin, B. D. (The Eurographics Association, 2004)
      In this paper we describe the design of B-spline surface models by means of curves and tangency conditions. The intended application is the conceptual constraint-driven design of surfaces from hand-sketched curves. The ...

    • Stability and Homotopy of a Subset of the Medial Axis 

      Chazal, F.; Lieutier, A. (The Eurographics Association, 2004)
      Medial Axis is known to be unstable for non smooth objects. The Medial Axis has applications in image analysis and mathematical morphology, Solid Modeling, or domain decomposition for CAD to CAE (i.e. Finite Elements) ...

    • Progressive Dimension-Independent Boolean Operations 

      Paoluzzi, A.; Pascucci, V.; Scorzelli, G. (The Eurographics Association, 2004)
      This paper introduces a new progressive multi-resolution approach for representating and processing polyhedral objects of any dimension. Our representation, a variant of BSP trees [Nay90] combined with the Split scheme ...

    • Efficient Processing of 3D Scanned Models 

      Scopigno, R. (The Eurographics Association, 2004)
      The construction of detailed and accurate 3D models is made easier by the increasing diffusion of automatic sampling devices (often called 3D scanners). These allow to build digital models of real 3D objects in a cost- and ...

    • Developability-preserved Free-form Deformation of Assembled Patches 

      Wang, C. C. L.; Tang, K. (The Eurographics Association, 2004)
      A novel and practical approach is presented in this paper that solves a constrained free-form deformation (FFD) problem where the developability of the tessellated embedded surface patches is preserved during the lattice ...