Browsing Volume 12 (1993) by Title
Now showing items 9-28 of 62
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The Cone of Normals Technique for Fast Processing of Curved Patches
(Blackwell Science Ltd and the Eurographics Association, 1993)The cone of normals technique for curved surface patches allows to perform various quick tests at the patch level such as front- or backfacing test, light influence test, and existence of silhouette edges test. For a given ... -
Cooperative Visualization of Computational Fluid Dynamics
(Blackwell Science Ltd and the Eurographics Association, 1993)Tempus Fugit/Interview is a computational fluid dynamics visualization application for which processing is distributed between high performance graphics workstations and supercomputers. Facilities are provided in the ... -
DaScript3D Integrating 3D Graphics in a Page Description Language
(Blackwell Science Ltd and the Eurographics Association, 1993)Despite the necessity of producing high-quality documents comprising all aspects of electronic publishing, there is still no system available that can generate and integrate two-dimensional (2D) graphics, three-dimensional ... -
A Declarative Design Method for 3D Scene Sketch Modeling
(Blackwell Science Ltd and the Eurographics Association, 1993)In this paper, we present a dynamic model associated with an intelligent CAD system aiming at the modeling of an architectural scene sketch. Our design methodology has been developed to simulate the process of a user who ... -
The Determination of Form-Factors by Lookup Table
(Blackwell Science Ltd and the Eurographics Association, 1993)Current methods for computer image synthesis using the radiosity algorithm rely heavily on the calculation of geometrical properties, known as form-factors, which quantify the energy exchange between pairs of surfaces in ... -
DIGIS A Graphical User Interface Design Environment for Non-Programmers
(Blackwell Science Ltd and the Eurographics Association, 1993)DIGIS (Direct Interactive Generation of Interactive Systems) is a graphical UI design environment for non-programmers that facilitates the design of all aspects of a UI with direct manipulation techniques. DIGIS is based ... -
Direct 3D Manipulation Techniques for Interactive Constraint-based Solid Modelling
(Blackwell Science Ltd and the Eurographics Association, 1993)This paper presents a novel constraint-based 3D manipulation approach to interactive constraint-based solid modelling. This approach employs a constraint recognition process to automatically recognise assembly relationships ... -
A Dynamic Gesture Language and Graphical Feedback for Interaction in a 3D User Interface
(Blackwell Science Ltd and the Eurographics Association, 1993)In user interfaces of modern systems, users get the impression of directly interacting with application objects. In 3D based user interfaces, novel input devices, like hand and force input devices, are being introduced. ... -
Electronic Kaleidoscopes for the Mind
(Blackwell Science Ltd and the Eurographics Association, 1993)The goal ofthis article is to present an informal introduction and tutorial on aestheticallypleasing kaleidoscopic images. The article is intended for the non-mathematical reader interested in computer art. Simple generating ... -
Extracting contour lines from a hierarchical surface model
(Blackwell Science Ltd and the Eurographics Association, 1993)The Hierarchical Triangulated Irregular Network (HTIN) is a structure for representing 2?-dimensional surfaces at different levels of detail through piecewise-linear approximations based on triangulations of the surface ... -
Fast Spheres
(Blackwell Science Ltd and the Eurographics Association, 1993)A new method for generating sphere-like images, using parabolic surfaces delimited by Bresenham s circle- generation algorithm, is presented. In many cases the resultant images are indistinguishable from spheres illuminated ... -
Form Factor Calculation: a New Expression with Implementations on a Parallel T.Node Computer
(Blackwell Science Ltd and the Eurographics Association, 1993)The radiosity technique uses the heat transfer theory to define a view-independent illumination model. For complex scenes, calculation of this model is very time-intensive, due largely to the determination of a geometric ... -
A Formal Specification of a Graphics System in the Framework of the Computer Graphics Reference Model
(Blackwell Science Ltd and the Eurographics Association, 1993)This paper is motivated by the emerging ISO/IEC Reference Model for Computer Graphics (CGRM) and the revision of the ISO/IEC computer graphics standard, the Graphical Kernel System (GKS). The paper explores the use of the ... -
A Fractal Method for Digital Elevation Model Construction and its Application to a Mountain Region
(Blackwell Science Ltd and the Eurographics Association, 1993)This paper presents and discusses the results of a methodology for the construction of Digital Elevation Models (DEM), based on mathematical principles of fractal geometry. Classical approaches to DEM are founded on numerical ... -
The Generation of Circular Arcs on Hexagonal Grids
(Blackwell Science Ltd and the Eurographics Association, 1993)The best disposition of a discrete set of points on the plane can be reached if the points are on a hexagonal grid. This paper describes two algorithms for circular arc mesh point selection on hexagonal grids. They find ... -
The Generation of Straight Lines on Hexagonal Grids
(Blackwell Science Ltd and the Eurographics Association, 1993)The best disposition of a discrete set of points on the plane can be reached if the points are on a hexagonal grid. This paper describes an algorithm for the generation of straight lines on hexagonal grids. It uses only ... -
GKS-9x: Some Implementation Considerations
(Blackwell Science Ltd and the Eurographics Association, 1993)The Graphical Kernel System (GKS) was published as an ISO standard for computer graphics programming in August 1985. GKS is now undergoing revision in ISO/IEC and at the time of writing the text of the Draft International ... -
Graphic Objects: A Mathematical Abstract Model for Computer Graphics
(Blackwell Science Ltd and the Eurographics Association, 1993)This paper defines an abstract mathematical model for graphic systems which incorporates modelling operations. The model is based on the"graphic object" concept. A graphic object is an abstraction of a graphic entity. ... -
An Integral Geometry Based Method for Fast Form-Factor Computation
(Blackwell Science Ltd and the Eurographics Association, 1993)Monte Carlo techniques have been widely used in rendering algorithms for local integration. For example, to compute the contribution of a patch to the luminance of another. In the present paper we propose an algorithm based ... -
An Integrated System for Modeling, Animating and Rendering Hair
(Blackwell Science Ltd and the Eurographics Association, 1993)There are basically four problems to solve in order to produce realistic animated synthetic actors with hair: hair modeling and creation, hair motion, collision detection and hair rendering. This paper describes a complete ...