Browsing EG1989 by Title
Now showing items 120 of 42

2.5 Dimensional Graphics Systems
(Eurographics Association, 1989)The outline of an extension of traditional 2D graphics systems is given. This extension is aimed at supporting a three dimensional application program, without incorporating full viewing into the general graphics system ... 
Accelerated Radiosity Method for Complex Environments
(Eurographics Association, 1989)As formfactor calculation costs about 90% of the computing time when applying radiosity approach for realistic image synthesis, it is of great significance to reduce the required computation, An accelerated radiosity ... 
Adding Parallelism in Object Space to the Rendering Pipeline
(Eurographics Association, 1989)This paper analyses the problem of adding parallelism to the rendering pipeline and discusses the reasons for advocating an objectspace partition. Consideration of the methods of work distribution and the rendering ... 
Algorithms for 2D Line Clipping
(Eurographics Association, 1989)New algorithms for 2D line clipping against convex, nonconvex windows and windows that consist of linear edges and arcs are being presented. Algorithms were derived from the CohenSutherland 's and LiangBarsky s algorithms. ... 
An Analysis of Modeling Clip
(Eurographics Association, 1989)Modeling clip gives an application the ability to remove sections of an object in order to view internal detail. The clipping volume defied by modeling clip can be concave and disjoint, and is composed of a set of volumes ... 
AntiAliasing by Successive Steps with a ZBuffer
(Eurographics Association, 1989)We present a method allowing to solve the three problems arising when a scene is displayed with the zbuffer algorithm. The proposed algorithm only requires one extra memory bit per pixel and delivers good quality images. ... 
Blending Rational BSpline Surfaces
(Eurographics Association, 1989)A method for blendin non uniform rational Bspline surface patches, either open or periodic, is developed. he blending surface is expressed in terms of an integral, bicubic Bspline patch. The blend ensures position and ... 
Colour Section
(Eurographics Association, 1989) 
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 BSplines
(Eurographics Association, 1989)Solid geometric models can be deformed to freeform solids by the use of trivariate Bsplines. 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 PHIGSterminology), 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, GKS3D and PHIGS. In this paper a simplified model GKSlike system is described and a 2D PHIGSlike ... 
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 syntaxdirected editor for any given diagram technique. ... 
Hierarchical Texture Synthesis on 3D Surfaces
(Eurographics Association, 1989)This paper presents a new method for synthesizing hierarchical textures on 3D 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+/PEXEnvironment
(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 MacroRegions: 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 macroregions. ... 
MessageBased ObjectOriented Interaction Modeling
(Eurographics Association, 1989)This paper describes a messagebased objectoriented tool for exploring mathematicallybased interactions which produce complex motions for computer animation. The tool has been implemented as an object in the objectoriented ... 
MICROUIDT: A User Interface Development Tool
(Eurographics Association, 1989)A user interlace development tool called MicroUIDT is described. MicroUIDT provides an interactive design environment fur the user interface designers. The designing language for defining user interfaces are visual and ...