Volume 13 (1994): Recent submissions

Now showing items 21-40 of 69

    • Cross Scan Buffer and its Applications 

      Tanaka, Toshimitsu; Takahashi, Tokiichiro (Blackwell Science Ltd and the Eurographics Association, 1994)
      We propose the Cross Scanline Buffer which preserves the result of hidden surface removal as performed by the Cross Scanline Algorithm. The Cross Scan Buffer reduces image re-generation time and eliminates aliasing artifacts ...

    • Sketching 3D models with 2D interaction devices 

      Branco, Vasco; Costa, Antonio; Ferreira, F. Nunes (Blackwell Science Ltd and the Eurographics Association, 1994)
      The creation of a 3D shape using CAD tools, namely solid modelers, is difficult and time-consuming. Therefore, these systems are kept away from the conceptual phases of design, perhaps the most important in any product ...

    • 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 ...

    • 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 ...

    • Adaptive mesh generation for progressive radiosity: A ray-tracing based algorithm. 

      PAULIN, Mathias; JESSEL, Jean-Pierre (Blackwell Science Ltd and the Eurographics Association, 1994)
      The radiosity method is one of the most popular rendering algorithms. It allows to simulate interreflections of light accurately between surfaces as energy transfers are well designed. However, this algorithm and its ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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)

    • 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 ...

    • Selective Visualization of Vector Fields 

      van Walsum, Theo; Post, Frits H. (Blackwell Science Ltd and the Eurographics Association, 1994)
      In this paper, we present an approach to selective vector field visualization. This selective visualization approach consists of three stages: selectdon creation, selection processing and selective visualization mapping. ...

    • Vector Fields: an Interactive Tool for Animation, Modeling and Simulation with Physically Based 3D Particle Systems and Soft Objects 

      Hilton, Travis L.; Egbert, Parris K. (Blackwell Science Ltd and the Eurographics Association, 1994)
      Vectorfields have traditionally been used in computer graphics as a means of visualizing models over time. This paper presents a system which extends the use of vector fields as an interactive tool for physically based ...

    • 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 ...

    • Towards Context- Dependent Interpolation of Digital Elevation Models 

      Dixon, A.R.; Kirby, G.H.; Wills, D.P.M. (Blackwell Science Ltd and the Eurographics Association, 1994)
      The fractional Brownian motion (fBm) model has become increasingly popular in recent years as a mechanism for the synthesis of many natural phenomena. Unfortunately, the required interdependence of neighbouring points over ...

    • Triangulating multiply-connected polygons: A simple, yet efficient algorithm. 

      Ronfard, Remi P.; Rossignac, Jarek R. (Blackwell Science Ltd and the Eurographics Association, 1994)
      We present a new, simple, yet efficient algorithm for triangulating multiply-connected polygons. The algorithm requires sorting only local concave minima (sags). The order in which triangles are created mimics a flooding ...

    • Visualization of Regular Polytopes in Three and Four Dimensions 

      Hausmann, Barbara; Seidel, Hans-Peter (Blackwell Science Ltd and the Eurographics Association, 1994)
      Nontrivial regular polytopes only exist in three and four dimensions. This paper describes a software package that allows to interactively visualize and analyze these regular polytopes. The following four tools are available: ...

    • Raycasting of Nonregularly Structured Volume Data 

      Fruhauf, Thomas (Blackwell Science Ltd and the Eurographics Association, 1994)
      Raycasting is an efficient, but computation-intensive technique for the direct rendering of volumetric data. Nonregularly structured volume data is produced in a variety of applications, such as numerical simulation, ...