Browsing Volume 10 (1991) by Issue Date
Now showing items 1-20 of 65
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A Survey of Several Root-Finding Methods in the Complex Plane
(Blackwell Science Ltd and the Eurographics Association, 1991)In this paper a few classes of root-finding iterative methods are presented and used in the complex plane to solve the equation z4? 1 = 0. These methods are studied using computer graphics techniques. -
The Formal Specification of Level la of GKS
(Blackwell Science Ltd and the Eurographics Association, 1991)In this paper the formal specification of a part of level la of GKS is given in the algebraic specification language OBJ. It shows that it is possible to produce a formal specification of a substantial part of GKS which ... -
Triangle Sets in PHIGS PLUS: a Valuable Link with Finite Element Modeling
(Blackwell Science Ltd and the Eurographics Association, 1991)At the ISO/IEC editing meeting on PHIGS PLUS1 in Villars sur Ollon, Switzerland from 9 to 14 September 1990, an additional output primitive was added to PHIGS PLUS: TRIANGLE SET 3 WITH DATA together with its 2D shorthand. ... -
Inspection of Lace Using Machine Vision
(Blackwell Science Ltd and the Eurographics Association, 1991) -
Block Iterations in the Complex Plane
(Blackwell Science Ltd and the Eurographics Association, 1991)In this note we propose a new technique for execution of the feedback process z ? z2+ c. The presented method is used to discover a family of sets in the complex plane. -
Control Points for Multivariate B-Spline Surfaces over Arbitrary Triangulations
(Blackwell Science Ltd and the Eurographics Association, 1991)This paper describes first results of a test implementation that implements the new multivariate B-splines as recently developed by Dahmen et al. 10for quadratics and cubics. The surface scheme is based on blending functions ... -
Object-Oriented Data Modelling for Graphics Databases: a Declarative Approach
(Blackwell Science Ltd and the Eurographics Association, 1991)This paper presents a new scheme to integrate the declarative approach to graphics and object-oriented data modelling techniques to form a fruitful symbiosis for constraint-based graphics database systems. It has rich ... -
Development of an Intelligent Wheelchair Using Computer Graphics Animation and Simulation
(Blackwell Science Ltd and the Eurographics Association, 1991)A new robot simulator JC-1 is used as a control software development tool in a project in progress where an intelligent wheelchair for a blind user is being developed. The intelligent wheelchair is planned to be able to ... -
The Shortest Way to Draw a Connected Picture
(Blackwell Science Ltd and the Eurographics Association, 1991)With any word over the alphabet ?=r, r?, u, u, we associate a connected picture in the following manner: the reading of each letter of this word induces a unit line: r (r?, u, u respectively) stands for a right (left, up, ... -
Million-Point Sculptures
(Blackwell Science Ltd and the Eurographics Association, 1991)Visually interesting chaotic attractors resembling sculpture are described. -
From Math Comes Beauty: Monkey Curves, Spirals, and Saddles
(Blackwell Science Ltd and the Eurographics Association, 1991)This informal note presents computational recipes for producing visually interesting surfaces. -
At Last an ISO C Binding of GKS
(Blackwell Science Ltd and the Eurographics Association, 1991)The C4 bindings of GKS1 and other semantic computer graphics standards like GKS-3D2 and PHIGS3 are long overdue. While GKS was completed in 1985 and GKS-3D2 (and PHIGS3) became an international standard in 1988, none of ... -
Computer Art from Numerical Methods
(Blackwell Science Ltd and the Eurographics Association, 1991)Zero-finding methods, Euler s method and the numerical algorithms elaborated as package subroutines are studied by using a computer graphics technique. The patterns obtained show chaotic behaviour (science) and beauty of ... -
Classification of Quad-encoding Techniques
(Blackwell Science Ltd and the Eurographics Association, 1991)Many quad encoding technique have been published previously, using a variety of approaches to the different facets of quad storage, representation and manipulation. We review the major classes and identify three parameters ... -
Quadtrees, Transforms and Image Coding
(Blackwell Science Ltd and the Eurographics Association, 1991)Transforms and quadtrees are both methods of representing information in an image in terms of the presence of information at differing length scales. This paper presents a mathematical relationship between these two ... -
The GKS Input Model in Manifold
(Blackwell Science Ltd and the Eurographics Association, 1991)This paper describes the specification of the GKS input model in Manifold. The aim of the work reported in this paper was two-fold: first, to review the communication patterns implied by the GKS input model, and second, ... -
Inverse Displacement Mapping
(Blackwell Science Ltd and the Eurographics Association, 1991)Inverse displacement mapping is a variant of displacement mapping which does not actually perturb the geometry of the surface being mapped. It is thus a true texture mapping technique which can be applied during rendering ... -
A Physically Based Colour Model
(Blackwell Science Ltd and the Eurographics Association, 1991)We propose an intuitively simple way of representing colour which has the additional virtue that, it permits mixing and overlaying of transparent and opaque paints to an arbitrary degree. Our approach is related to the ... -
Cartographic Algorithms: Problems of Implementation and Evaluation and the Impact of Digitising Errors
(Blackwell Science Ltd and the Eurographics Association, 1991)Cartographic generalisation remains one of the outstanding challenges in digital cartography and Geographical Information Systems (GIS). It is generally assumed that computerisation will lead to the removal of spurious ... -
Fat curves
(Blackwell Science Ltd and the Eurographics Association, 1991)Fat curves in two-dimensional Euclidean space are discussed. Previous work on fat curves is reviewed and a new definition is given for a fat curve having a smooth axis. The joining of two fat curves is discussed and a ...