Browsing Issue 3 by Title

Now showing items 1-20 of 44

    • 3D Visualization for 2D GIS: an Analysis of the Users Needs and a Review of Techniques* 

      Giertsen, Christopher; Lucas, Anne (Blackwell Science Ltd and the Eurographics Association, 1994)
      Most of the existing geographical information systems (GIS) make limited use of algorithms for advanced computer graphics and visualization. One explanation is that few attempts are made to identify the visualization needs ...

    • 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 ...

    • AGRELs and BIPs: Metamorphosis as a Bezier curve in the space of polyhedra 

      Rossignac, Jarek; Kaul, Anil (Blackwell Science Ltd and the Eurographics Association, 1994)
      The metamorphosis between two user-specified objects offers an intuitive metaphor for designing animations of deforming shapes. We present a new technique for interactively editing such deformations and for animating them ...

    • Beyond WYSIWYG: Display of Hidden Information in Graphics Editors 

      Schleich, R.; Durst, M.J. (Blackwell Science Ltd and the Eurographics Association, 1994)
      Graphics editors such as computer aided design systems are complex and difficult to use. We attribute this to the fact that only a small part of the information is visible and therefore accessible and understandable. Only ...

    • Chebyshev Polynomials for Boxing and Intersections of Parametric Curves and Surfaces 

      Fournier, Alain; Buchanan, John (Blackwell Science Ltd and the Eurographics Association, 1994)
      Parametric curves and surfaces are powerful and popular modelling tools in Computer Graphics and Computer Aided Design. Ray-tracing is a versatile and popular rendering technique. There is therefore a strong incentive in ...

    • COMPUTER GRAPHICS AND REMOTE SENSING - A SYNTHESIS FOR ENVIRONMENTAL PLANNING AND CIVIL ENGINEERING 

      Graf, K.Ch.; Suter, M.; Hagger, J.; Nuesch, D. (Blackwell Science Ltd and the Eurographics Association, 1994)
      This paper presents efforts undertaken in the field of photo-realistic visualization of natural landscapes using digital elevation models (DEM) and images generated by remote sensing techniques. The remote sensing systems ...

    • Computer Graphics System for Reproducing Three- Dimensional Shape from Idea Sketch 

      Akeo, Makoto; Hashimoto, Hiroshi; Kobayashi, Taisuke; Shibusawa, Tetsuo (Blackwell Science Ltd and the Eurographics Association, 1994)
      This paper describes the technical features and method of implementation of our designer support system which enables reproducing a three-dimensional shape from an idea sketch speedily and modifying the reproduced shape ...

    • 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 ...

    • 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 ...