Browsing Volume 12 (1993) by Title
Now showing items 17-36 of 62
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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 ... -
Interactive Neural Network Texture Analysis and Visualization for Surface Reconstruction in Medical Imaging
(Blackwell Science Ltd and the Eurographics Association, 1993)The following paper describes a new approach for the automatic segmentation and tissue classification of anatomical objects such as brain tumors from magnetic resonance imaging (MRI) data sets using artificial neural ... -
Introducing blending operations in feature models
(Blackwell Science Ltd and the Eurographics Association, 1993)We describe the implementation of a blending facility in the context of a feature modelling system where solid and feature-based modelling operations can be utilized in parallel during the design process of a part. The ... -
Landscapes Synthesis Achieved through Erosion and Deposition Process Simulation
(Blackwell Science Ltd and the Eurographics Association, 1993)This paper describes an original approach to terrain evolution in landscapes synthesis. In order to create some realistic landforms, we simulate geologically contrasted terrains and apply to them deterministic erosion ... -
A Library for Developing PHIGS Programming Tools in a PEX Environment
(Blackwell Science Ltd and the Eurographics Association, 1993)The merger of three-dimensional graphics with the X Window System has recently been standardized by adapting PHIGS, the Programmer s Hierarchical Interactive Graphics System, to the X Window System with PEX, the PHIGS ... -
The Method of Dynamic Palette Construction in Realistic Visualization Systems
(Blackwell Science Ltd and the Eurographics Association, 1993)The paper describes the colour approximation problem and the method of dynamic palette construction is suggested for its solution. The method uses the graphic display palette based on the computed true colour of the ... -
Modeling of Skylight and Rendering of Outdoor Scenes
(Blackwell Science Ltd and the Eurographics Association, 1993)Photorealistic animated images are extremely effective for pre-evaluating visual impact of city renewal and construction of tall buildings. In order to generate a photorealistic image not only the direct sunlight but also ... -
A Multiprocessor Implementation of Radiosity
(Blackwell Science Ltd and the Eurographics Association, 1993)This paper describes a multi-processor implementation of form factor computation in the radiosity method. Form factors are computed using the ray casting method and the algorithm is enhanced with Binary Space Partition ... -
A New Approach for the Generation of Circles
(Blackwell Science Ltd and the Eurographics Association, 1993)Two incremental algorithms for drawing circles using short line segments are proposed in this paper. The proposed algorithms can draw manypoints at one time. They use only addition, subtraction, and shift operations except ...