Browsing Volume 13 (1994) by Issue Date
Now showing items 21-40 of 69
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Multiresolution Tiling
(Blackwell Science Ltd and the Eurographics Association, 1994)This paper describes an efficient method for constructing a tiling between a pair of planar contours. The problem is of interest in a number of domains, including medical imaging, biological research and geological ... -
A Constraint-Based Reasoning Framework for Behavioural Animation
(Blackwell Science Ltd and the Eurographics Association, 1994)Behaviour is a reflection of a reasoning process that must deal with constraints imposed by an external environment, internal knowledge and physical structure. This paper proposes a framework for behavioural animation that ... -
A Schematic Entry Drawing Capability in a Linearised Hypermedia System
(Blackwell Science Ltd and the Eurographics Association, 1994)This paper describes a linearised hypermedia system, called the Book Emulator, that generally supports the capture of diagrammatic specifications such as SSADM and electronic circuit diagrams, and the capture of mathematical ... -
Contextual Animation of Gestural Commands
(Blackwell Science Ltd and the Eurographics Association, 1994)Drawing a mark can be an efficient command input technique when using a pen-based computer. However, marks are not intrinsically self-explanatory as are other interactive techniques such as buttons and menus. We present ... -
A New Real Time Geometric Transformation Matrix and its Efficient VLSI Implementation
(Blackwell Science Ltd and the Eurographics Association, 1994)The geometric transformation of an image with irregular shapes from a source space to a target space requires a huge number of multiplications and additions for each pixel. Such a through put is impossible to deliver by ... -
Adaptive mesh generation for progressive radiosity: A ray-tracing based algorithm.
(Blackwell Science Ltd and the Eurographics Association, 1994)The radiosity method is one of the most popular rendering algorithms. It allows to simulate interreflections of light accurately between surfaces as energy transfers are well designed. However, this algorithm and its ... -
Chebyshev Polynomials for Boxing and Intersections of Parametric Curves and Surfaces
(Blackwell Science Ltd and the Eurographics Association, 1994)Parametric curves and surfaces are powerful and popular modelling tools in Computer Graphics and Computer Aided Design. Ray-tracing is a versatile and popular rendering technique. There is therefore a strong incentive in ... -
Triangulating multiply-connected polygons: A simple, yet efficient algorithm.
(Blackwell Science Ltd and the Eurographics Association, 1994)We present a new, simple, yet efficient algorithm for triangulating multiply-connected polygons. The algorithm requires sorting only local concave minima (sags). The order in which triangles are created mimics a flooding ... -
Parallel ray tracing based upon a multilevel topological knowledge acquisition of the scene
(Blackwell Science Ltd and the Eurographics Association, 1994)Including the standard parallelization by grouping primary rays, this paper presents a new parallel ray-timing method based upon a topological knowledge acquisition of the scene. This topological knowledge focuses on ... -
Designing and Implementing a Grid-Distortion Mapping Based on Variational Principles
(Blackwell Science Ltd and the Eurographics Association, 1994)A grid-distortion mapping based on variational principles is described. The mapping is first defined between any two equivalent regular grids with minor geometric restrictions, and is then optimally extended to the interior ... -
Selective Visualization of Vector Fields
(Blackwell Science Ltd and the Eurographics Association, 1994)In this paper, we present an approach to selective vector field visualization. This selective visualization approach consists of three stages: selectdon creation, selection processing and selective visualization mapping. ... -
A Formal Approach to the Specification of Graphic Object Functions
(Blackwell Science Ltd and the Eurographics Association, 1994)Graphic objects are an abstract mathematical model for graphic systems. The model is an algebraic approach to represent graphic information, which include modelling operations. This formalism require some method to describe ... -
A Median Cut Algorithm for Efficient Sampling of Radiosity Functions
(Blackwell Science Ltd and the Eurographics Association, 1994)This paper presents an efficient method for sampling the illumination functions in higher order radiosity algorithms. In such algorithms, the illumination function is not assumed to be constant across each patch, but it ... -
Reducing The Latency In Head-Mounted Displays By A Novel Prediction Method Using Grey System Theory
(Blackwell Science Ltd and the Eurographics Association, 1994)In this paper we propose a novel prediction method for the head motion using Grey System theory, where a 6D tracker is attached to an HMD on a user s head in virtual reality applications. Our prediction method using Grey ... -
Fast Wavelet Radiosity Method
(Blackwell Science Ltd and the Eurographics Association, 1994)Wavelet analysis has been found [1] to be very useful for functional representation and accurate global solution of radiosity. In radiosity we deal with functions in 2D and 4D spaces. Under such conditions, the biggest ... -
Real Time Fitting of Hand-Sketched Pressure Brushstrokes
(Blackwell Science Ltd and the Eurographics Association, 1994)A method is described for fitting the outline of hand-sketched pressure brushstrokes with Bezier curves. It combines the brush-trajectory model, in which a stroke is generated by dragging a brush along a given trajectory, ... -
A Robust and Consistent Algorithm for Intersecting Convex Polyhedra
(Blackwell Science Ltd and the Eurographics Association, 1994)This paper presents a numerically robust and topologically consistent algorithm for intersecting convex polyhedra. This algorithm is new in the sense that the consistency issue is completely separated from the numerical ... -
Variational Design and Fairing of Spline Surfaces
(Blackwell Science Ltd and the Eurographics Association, 1994)Variational principles have become quite popular in the design of free form surfaces. Among others they are used for fairing purposes. The choice of the right fairness functional is a crucial step. There is always a ... -
Beyond WYSIWYG: Display of Hidden Information in Graphics Editors
(Blackwell Science Ltd and the Eurographics Association, 1994)Graphics editors such as computer aided design systems are complex and difficult to use. We attribute this to the fact that only a small part of the information is visible and therefore accessible and understandable. Only ... -
AGRELs and BIPs: Metamorphosis as a Bezier curve in the space of polyhedra
(Blackwell Science Ltd and the Eurographics Association, 1994)The metamorphosis between two user-specified objects offers an intuitive metaphor for designing animations of deforming shapes. We present a new technique for interactively editing such deformations and for animating them ...