Issue 1
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A New Method Of Curve Parameterization with Applications in Computer Aided Design
[meta data] [files:
Bez, H E
;
Filipe, A
CAD For Intelligent Activity of an Autonomous Submersible System
[meta data] [files:
Russell, G T
;
Lane, D M
The Winchester Graphics System: A Technical Overview
[meta data] [files:
Heywood, T R
;
Galton, B N
;
Gillett, J
;
Morffew, A J
;
Quarendon, P
;
Todd, S J P
;
Wright, W V
The Eurographics 84 Computer Art and Animation Competition
[meta data] [files:
Schoenhut, J
;
Contin, S
IDECAP Interactive Pictorial Information System for Demographic and Environmental Planning Applications
[meta data] [files:
van den Bos, J.
;
van Naelten, M.
;
Teunissen, W.
Oriented geometric Objects in Computer Graphics and Numerical Control
[meta data] [files:
Barbic, J.
;
Dacar, F.
;
Spegel, M.
Colour Gradation, Shading and Texture Using a Limited Terminal
[meta data] [files:
Magnetat-Thalmann, N
;
Chourot, N
;
Thalmann, D
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Recent Submissions
Item EDITORIAL(Blackwell Publishing Ltd and the Eurographics Association, 1984) Duce, David; Enderle, GunterItem Applications of Computer Graphics in Molecular Biology(Blackwell Publishing Ltd and the Eurographics Association, 1984) Diamond, RItem A Functional Approach to Picture Manipulation(Blackwell Publishing Ltd and the Eurographics Association, 1984) Arya, KA functional approach is used to investigate the creation and manipulation of pictures as hierarchical entities. A set of useful functions is designed and used in a series of illustrative examples written in the functional programming language HOPE. A functional animation system incorporating these ideas is then discussed.Item A New Method Of Curve Parameterization with Applications in Computer Aided Design(Blackwell Publishing Ltd and the Eurographics Association, 1984) Bez, H E; Filipe, AA new method of parameterization, based on areas, is suggested and some results obtained for planar cubic curves are presented and compared with standard methods. The new technique provides a "tight" interpolant, is axis independent and offers shape control via a set of off geometry data points (henceforth called poles) relative to which areas are computed. A simple algorithm for the computation of initial pole positions is given (this is based on obtaining agreement with a standard parameterized curve on the same data and with identical geometrical end conditions). Some additional properties of the parameterization are discussed including its limiting behaviour and its applicability to function drawing.Item CAD For Intelligent Activity of an Autonomous Submersible System(Blackwell Publishing Ltd and the Eurographics Association, 1984) Russell, G T; Lane, D MThis paper describes a CAD facility for the design of automatic guidance and control strategies for an unmanned autonomous submersible. The facility utilises a three dimensional colour graphics display of the scene and vehicle trajectory, providing a man/ machine interface for the operator in addition to vehicle motion simulation with six degrees of freedom. A primary application envisaged for the CAD facility is in the design of scene analysis algorithms and the intelligent control system structure, for an autonomous submersible employing scanning sonar as its target sensor.Item The Winchester Graphics System: A Technical Overview(Blackwell Publishing Ltd and the Eurographics Association, 1984) Heywood, T R; Galton, B N; Gillett, J; Morffew, A J; Quarendon, P; Todd, S J P; Wright, W VThis paper gives a technical overview of the Winchester Graphics System. It concentrates on the software system, and in particular, the use of a relational database (PRTV). The main use of the system is in scientific research and it has been used a great deal in Chemistry, Biophysics and related sciences. However, the facilities are general and the same system is used for quite different applications. such as engineering and archaeology. This database has been found to provide researchers with a powerful flexible tool and has helped the UKSC to provide an environment where new ideas can be proposed and evaluated quickly and easily.Item The Eurographics 84 Computer Art and Animation Competition(Blackwell Publishing Ltd and the Eurographics Association, 1984) Schoenhut, J; Contin, SItem The Systolic Pixel: A Visible Surface Algorithm for VLSI.(Blackwell Publishing Ltd and the Eurographics Association, 1984) Mills, P LThe Systolic Pixel or Spixel is a novel architecture for an intelligent pixel-based graphics database for geometric-solid models. An algorithm is described which performs visible surface calculations for any complexity of coloured 3-dimensional (3-D) surface and which structures geometric-solid model data in a natural way. The algorithm/architecture of the spixel features a simple set of priority rules acting upon data in nearest neighbour locations and a simple set of movement rules of data to nearest neighbour locations. The spixel is constructed out of identical functional units. These features are attractive for an implementation of the algorithm in Very Large Scale Integration (VLSI).Item Managing Multiple Context-Frames through GKS(Blackwell Publishing Ltd and the Eurographics Association, 1984) Herman, I.Item IDECAP Interactive Pictorial Information System for Demographic and Environmental Planning Applications(Blackwell Publishing Ltd and the Eurographics Association, 1984) van den Bos, J.; van Naelten, M.; Teunissen, W.IDECAP is a database type information system. It is different from regular database systems as the information is mainly presented via thematic maps displayed on a graphics screen. Retrieval of information is usually achieved by means of graphical interaction with these images. The system utilizes interaction techniques and systems software from interactive computer graphics, using vector graphic and colour raster graphic stations for output. The present databank contains data based on grids and polygonal data. The system is being applied, but not restricted, to the Dutch 1971 Census data and the 1978 land use data. It allows the mapping of grid variables against a topographic background. Areas of interest can be investigated in detail by zooming in on a window drawn on the graphics screen by the user. Maps can be adjusted by user-definable class distributions shown in the form of histograms with standard deviations.Item Oriented geometric Objects in Computer Graphics and Numerical Control(Blackwell Publishing Ltd and the Eurographics Association, 1984) Barbic, J.; Dacar, F.; Spegel, M.Conventional natural - language as well as computer - oriented descriptions of geometric constructions by means of geometric relationships (parallelism, tangency, etc.) and attributes (INSIDE, NEAR, MIDDLE, X-LARGE, Y-SMALL, etc.) do not offer a clear and efficient method for selecting a specific object out of a number of possible alternatives. This paper describes a systematic solution to the problem based upon the notions of orientation of geometric objects, of smooth transitions from one object to another (referred to as coherent tangency), and upon locality. Using the notions of object orientation and coherent tangency, some tangent constructions in a plane are developed. The method is shown to employ a minimum set of attributes - at most one, characterizing the intrinsic parameters of geometric objects.Item Colour Gradation, Shading and Texture Using a Limited Terminal(Blackwell Publishing Ltd and the Eurographics Association, 1984) Magnetat-Thalmann, N; Chourot, N; Thalmann, DThis paper presents a method of colouring pictures by using three kinds of gradation techniques: gradation from a figure to a point, gradation from a figure to a line segment and gradation from a figure to another figure. Intermediate figures are computed by homothesis or interpolation. The gradation is obtained by colouring these intermediate figures. The colours are simulated by using programmed pattern. This approach has allowed us to produce realistic images with a hardware device that is not very good for these types of applications. because of its restricted intensity and colour capabilities. Colour distribution algorithms and gradation techniques are explained in detail. A few examples with shading and texture are shown.Item Computer Graphics Forum - Algorithm Section(Blackwell Publishing Ltd and the Eurographics Association, 1984) Hewitt, W.T.Item NICOGRAPH’83 Conference Report(Blackwell Publishing Ltd and the Eurographics Association, 1984) Hubbold, R J; Page, IItem Report on a Geometric Modelling Course(Blackwell Publishing Ltd and the Eurographics Association, 1984) Lastra, G. LeonItem Letters(Blackwell Publishing Ltd and the Eurographics Association, 1984) Gangnet, M.Item Book Reviews(Blackwell Publishing Ltd and the Eurographics Association, 1984)Book reviewed in this article:Introduction to the Graphical Kernel System (GKS), F.R.A.Elementary Computer Graphics, A.A.SMALLTALK 80: Bits of History, Words of Advice Edited by Glen Krasner, Xerox PARC.Item News(Blackwell Publishing Ltd and the Eurographics Association, 1984)Item Executive Committee Elections(Blackwell Publishing Ltd and the Eurographics Association, 1984)Item EUROGRAPHICS 84 at the Bella Centre Copenhagen September 10 - 14, 1984(Blackwell Publishing Ltd and the Eurographics Association, 1984)Item Membership Form(Blackwell Publishing Ltd and the Eurographics Association, 1984)Item From the Secretary(Blackwell Publishing Ltd and the Eurographics Association, 1984)