Browsing EG1989 Proceedings (Technical Papers) by Title
Now showing items 8-27 of 42
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Components, Frameworks and GKS Input
(Eurographics Association, 1989)This paper was inspired by the Components/ Frameworks approach to a Reference Model for computer graphics, currently under discussion in the ISO computer graphics subject committee. The paper shows how a formal description ... -
Deformation of Solids with Trivariate B-Splines
(Eurographics Association, 1989)Solid geometric models can be deformed to free-form solids by the use of trivariate B-splines. This paper describes the problems of implementing such transformations for shaded rendering. The surfaces are subdivided into ... -
Delauney Triangulations and the Radiosity Approach
(Eurographics Association, 1989)The radiosity approach requires the subdivision of complex surfaces into simple components called patches. Since we assume to have constant intensity over a patch, the generation of regular patches is a desirable property ... -
Forest of Quadtrees: An Object Representation for 3D Graphics
(Eurographics Association, 1989)A forest of quadtrees is proposed as an alternative data structure for representing and manipulating 3D and 2.5D graphics. A data representation of a forest offers space savings over common quadtrees by concentrating the ... -
GEO++ - A System for Both Modelling and Display
(Eurographics Association, 1989)We present a new concept for a graphics system which we call GEO++ . Apart from the manipulation of groups (structures in PHIGS-terminology), GEO++ permits a direct access to the tree structure required for display. With ... -
GKS, Structures and Formal Specification
(Eurographics Association, 1989)There are now three International Standards for application program interfaces for computer graphics programming, GKS, GKS-3D and PHIGS. In this paper a simplified model GKS-like system is described and a 2D PHIGS-like ... -
Graph Grammars, A New Paradigm for Implementing Visual Languages
(Eurographics Association, 1989)This paper is a report on an ongoing work which started in 1981 and is aiming at a general method which would help to considerably reduce the time necessary to develop a syntax-directed editor for any given diagram technique. ... -
Hierarchical Texture Synthesis on 3-D Surfaces
(Eurographics Association, 1989)This paper presents a new method for synthesizing hierarchical textures on 3-D surfaces. This method utilizes both a mapping technique for rendering the macroscopic structure on the surface and a generalization of the ... -
Highlight Shading: Lighting and Shading in a PHIGS+/PEX-Environment
(Eurographics Association, 1989)Todays graphics standard for the rendering of scenes with illumination and reflection is defined by PHIGS+ . PEX is a proposal to integrate that functionality into the window environment of X. This paper first describes ... -
The Macro-Regions: An Efficient Space Subdivision Structure for Ray Tracing
(Eurographics Association, 1989)Ray tracing is the usual image synthesis technique which allows rendering of specular effects. The use of space subdivision for ray tracing optimization is studied. A new method of subdivision is proposed : the macro-regions. ... -
Message-Based Object-Oriented Interaction Modeling
(Eurographics Association, 1989)This paper describes a message-based object-oriented tool for exploring mathematically-based interactions which produce complex motions for computer animation. The tool has been implemented as an object in the object-oriented ... -
MICRO-UIDT: A User Interface Development Tool
(Eurographics Association, 1989)A user interlace development tool called Micro-UIDT is described. Micro-UIDT provides an interactive design environment fur the user interface designers. The designing language for defining user interfaces are visual and ... -
A Model for Description and Synthesis of Heterogeneous Textures
(Eurographics Association, 1989)Existing texture models either describe textures as a non-hierarchical surface property (by means of Markov chains, time series and other stochastic methods) or distinguish only between micro and macro textures. Besides ... -
Non-Planar Polygons and Photographic Components for Naturalism in Computer Graphics
(Eurographics Association, 1989)The measuring of natural objects like landscapes and already existing (not simply planned!) buildings produces natural data. That data of hue geometry typically consists of Non-planar Polygons. These may be triangulized, ... -
On Reducing the Phong Shading Method
(Eurographics Association, 1989)Today, the shading method of Phong plays an important role in the design of realtime image generation systems. Often, the model has been used in combination with a color interpolation, suppressing a main property of this ... -
On the Software Structure of User Interface Management Systems
(Eurographics Association, 1989)Specific systems for the development of user interfaces (Uls) are used today for coping with the increasing problems of human-computer communication. Some of those systems are based on well-defined models for humancomputer ... -
A Parallel Image Computer with a Distributed Frame Buffer: System Architecture and Programming
(Eurographics Association, 1989)We describe the system architecture and the programming environment of the Pixel Machine - a parallel image computer for 2D and 3D image synthesis and analysis. The architecture of the computer is based on an array of ... -
Pixel Selected Ray Tracing
(Eurographics Association, 1989)This paper presents a new ray-tracing acceleration technique called Pixel Selected Ray-Tracing (PSRT). PSRT uses undersampling based on Iterative Central Point Selection(ICPS) along with checking for similarities among ... -
Ray Tracing Polynomial Tensor Product Surfaces
(Eurographics Association, 1989)With regard to ray tracing algorithms for polynomial tensor product surfaces, the most timecritical step is to find an intersection point of a ray and a surface. In this case it proves to be very difficult to decide whether ...