Browsing Issue 3 by Title

Now showing items 9-28 of 44

    • Designing and Implementing a Grid-Distortion Mapping Based on Variational Principles 

      Arad, Nur (Blackwell Science Ltd and the Eurographics Association, 1994)
      A grid-distortion mapping based on variational principles is described. The mapping is first defined between any two equivalent regular grids with minor geometric restrictions, and is then optimally extended to the interior ...

    • Efficient self-collision detection on smoothly discretized surface animations using geometrical shape regularity 

      VOLINO, Pascal; THALMANN, Nadia Magnenat (Blackwell Science Ltd and the Eurographics Association, 1994)
      We present a new algorithm for detecting self-collisionson highly discretized moving polygonal surfaces. If is based on geometrical shape regularity properties that permit avoiding many useless collision tests. We use an ...

    • Fast Dynamic Tessellation of Trimmed NURBS Surfaced1 

      Abi-Ezzi, Salim S.; Subramaniam, Srikanth (Blackwell Science Ltd and the Eurographics Association, 1994)
      Trimmed NURBS (non-uniform rational B-splines) surfaces are being increasingly used and standardized in geometric modeling applications. Fast graphical processing of trimmed NURBS at interactive speeds is absolutely essential ...

    • Fast Wavelet Radiosity Method 

      Pattanaik, Sumanta N.; Bouatouch, Kadi (Blackwell Science Ltd and the Eurographics Association, 1994)
      Wavelet analysis has been found [1] to be very useful for functional representation and accurate global solution of radiosity. In radiosity we deal with functions in 2D and 4D spaces. Under such conditions, the biggest ...

    • A Formal Approach to the Specification of Graphic Object Functions 

      Torres, J.C.; Clares, B. (Blackwell Science Ltd and the Eurographics Association, 1994)
      Graphic objects are an abstract mathematical model for graphic systems. The model is an algebraic approach to represent graphic information, which include modelling operations. This formalism require some method to describe ...

    • GKS-9x: The Design Output Primitive, an Approach to a Specification. 

      Nehlig, Ph. W.; Duce, D. A. (Blackwell Science Ltd and the Eurographics Association, 1994)
      This paper describes an approach to the formal definition of the design primitive introduced in the revision of the ISO/IEC computer graphics standard, GKS. The paper starts with a general description of the design primitive ...

    • A Hand Control and Automatic Grasping System for Synthetic Actors 

      Sanso, Ramon Mas; Thalmann, Daniel (Blackwell Science Ltd and the Eurographics Association, 1994)
      In the computer animation field, the interest for grasping has appeared with the development of synthetic actors. Based on a grasp taxonomy, we propose a completely automatic grasping system for synthetic actors. In ...

    • How to Render Frames and Influence People 

      Strothotte, Thomas; Preim, Bernhard; Raab, Andreas; Schumann, Jutta; Forsey, David R. (Blackwell Science Ltd and the Eurographics Association, 1994)
      Rendering systems generally treat the production of images as an objective process governed by the laws of physics. However, perception and understanding on the part of viewers are subjective processes influenced by a ...

    • Implementing RenderMan - Practice, Problems and Enhancements 

      Slusallek, Philipp; Pflaum, Thomas; Seidel, Hans-Peter (Blackwell Science Ltd and the Eurographics Association, 1994)
      The RenderMan interface has been proposed as a general interface to rendering systems, yet only a few implementations of the interface exist. In this paper we describe the implementation of the RenderMan interface on a ...

    • Improved Visualisation of Marine Data: Algae and Acid Rain 

      Day, A.M.; Turner, S.M.; Arnold, D.B. (Blackwell Science Ltd and the Eurographics Association, 1994)

    • An Inexpensive BRDF Model for Physically-based Rendering 

      Schlick, Christophe (Blackwell Science Ltd and the Eurographics Association, 1994)
      A new BRDF model is presented which can be viewed as an kind of intermediary model between empirism and theory. Main results of physics are observed (energy conservation, reciprocity rule, microfacet theory) and numerous ...

    • An Integrated Line Tracking and Vectorization Algorithm 

      van Nieuwenhuizen, Peter R.; Kiewiet, Olaf; Bronsvoort, Willem F. (Blackwell Science Ltd and the Eurographics Association, 1994)
      A method is presented to compute a vector representation of an arbitrary line in a bi-level raster image The line may have varying line width and irregular borders. Furthermore, at line crossings and branches the user is ...

    • Magicsphere: an insight tool for 3D data visualization 

      Cignoni, P.; Montani, C.; Scopigno, R. (Blackwell Science Ltd and the Eurographics Association, 1994)
      How to render very complex datasets, and yet maintain interactive response times, is a hot topic in computer graphics. The MagicSphere idea originated as a solution to this problem, but its potential goes much further than ...

    • A Median Cut Algorithm for Efficient Sampling of Radiosity Functions 

      Feda, Martin; Purgathofer, Werner (Blackwell Science Ltd and the Eurographics Association, 1994)
      This paper presents an efficient method for sampling the illumination functions in higher order radiosity algorithms. In such algorithms, the illumination function is not assumed to be constant across each patch, but it ...

    • The Mesh Propagation Algorithm for Isosurface Construction 

      Howic, C.T.; Blake, E.H. (Blackwell Science Ltd and the Eurographics Association, 1994)
      A new algorithm, Mesh Propagation, is presented for the generation of isosurfaces from three-dimensional discrete data sets. While producing the same surface mesh as that generated by a corrected Marching Cubes algorithm, ...

    • A Method for Displaying Metaballs by using Bezier Clipping 

      Nishita, Tomoyuki; Nakamae, Eihachiro (Blackwell Science Ltd and the Eurographics Association, 1994)
      For rendering curved surfaces, one of the most popular techniques is metaballs, an implicit model based on isosurfaces of potential fields. This technique is suitable for deformable objects and CSG model.For rendering ...

    • A New Approach to the Construction of Surfaces from Contour Data 

      Jones, Mark W.; Chen, Min (Blackwell Science Ltd and the Eurographics Association, 1994)
      This paper presents a new approach to the construction of a surface from a stack of contour slices. Unlike most existing methods, this new approach handles ambiguous conditions consistently without employing an algorithm ...

    • A Paradigm for the Robust Design of Algorithms for Geometric Modeling 

      Agrawal, Amitabh; Requicha, Aristides A. G. (Blackwell Science Ltd and the Eurographics Association, 1994)
      Geometric modelers are becoming faster and more powerful, but they still suffer from reliability problems because of floating point errors. Previous work in the field of robust geometric modeling tends to be problem specific ...

    • Parallel ray tracing based upon a multilevel topological knowledge acquisition of the scene 

      RIS, Philippe; ARQUES, Didier (Blackwell Science Ltd and the Eurographics Association, 1994)
      Including the standard parallelization by grouping primary rays, this paper presents a new parallel ray-timing method based upon a topological knowledge acquisition of the scene. This topological knowledge focuses on ...

    • PREMO - An Initial Approach to a Formal Definition 

      DUCE, D.A.; DUKE, D.J.; ten HAGEN, P.J.W.; REYNOLDS, G.J. (Blackwell Science Ltd and the Eurographics Association, 1994)
      Many descriptions of multimedia programming systems are starting to appear in the literature, but little work has yet been done on how to formally specify and reason about such systems. This paper is a contribution on the ...