Browsing EG1989 Proceedings (Technical Papers) by Title
Now showing items 18-37 of 42
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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 ... -
A Reference Model for the Visualisation of Multi-Dimensional Data
(Eurographics Association, 1989)This paper presents a reference model for the development of systems for the visualization of multidimensional data. The purpose of the reference model is to build a conceptual basis for thinking about multi-dimensional ... -
Representing Tolerance Information in Feature-Based Solid Modelling
(Eurographics Association, 1989)In this paper a system for defining dimensions and tolerances is presented which deals with the geometric representation of the objects in a coherent and compact way. This model is a combination of a hierarchical boundary ... -
The Structure of Tube - A Tool for Implementing Advanced User Interfaces
(Eurographics Association, 1989)Good user interfaces are very costly to implement and maintain. As user interfaces become more advanced, moving to various forms of direct manipulation, they become even more expensive and difficult to implement. In the ... -
Subdivisions of Surfaces and Generalized Maps
(Eurographics Association, 1989)The modeling of subdivisions of surfaces is of greatest interest in Geometric Modeling (in particular for Boundary Representation) , and many works deal with the definition of models, which enable the representation of ... -
Supporting Graphical Languages with Structure Editors
(Eurographics Association, 1989)Graphical editors are used in numerous application fields for purposes like specification, design, modelling, or description of structures of various kinds. These editors handle the graphical representations based on objects ... -
A Topological Map-Based Kernel for Polyhedron Modelers: Algebraic Specification and Logic Prototyping
(Eurographics Association, 1989)This paper deals with the topology of surfaces, in the boundary representation of three dimensional objects. Orientable, not orientable, closed or open surfaces are efficiently described and handled when considered as ... -
Toward Realistic Formal Specifications for Non-Trivial Graphical Objects
(Eurographics Association, 1989)Formal specification has long been advocated in programming methodology, and is becoming increasingly popular in computer graphics to characterise the semantics of components of graphics systems. Unfortunately, formal ... -
Two Object-Oriented Models to Design Graphical User Interfaces
(Eurographics Association, 1989)Object-oriented concepts are well-suited to deal with the characteristics of user interfaces. Up to now several attempts to integrate the object-oriented paradigm in user interface models were evolved and led to distinctive ... -
The Use of Finite Element Theory for Simulating Object and Human Body Deformations and Contacts
(Eurographics Association, 1989)This paper presents a method for combining image synthesis and modeling based on a finite element method (FEM) to get realistic intelligent images. FEM is used for modeling both elastically and plastically deformations of ... -
Variations on a Dither Algorithm
(Eurographics Association, 1989)Mapping continuous-tone pictures into digital halftone pictures, i.e. 0/1-pictures, for printing purposes is a well explored technique. In this paper, one of these algorithms, the two-dimensional error-diffusion algorithm ...