Volume 13 (1994): Recent submissions
Now showing items 41-60 of 69
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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 ... -
Volume Rendering on Non-regular Grids
(Blackwell Science Ltd and the Eurographics Association, 1994)In this article we present the principle methods for volumerendering of non-regular grids as used in the Finite Element Method or the Method of Control Volumes. Besides linear element types, the methods discussed here also ... -
A Method for Displaying Metaballs by using Bezier Clipping
(Blackwell Science Ltd and the Eurographics Association, 1994)For rendering curved surfaces, one of the most popular techniques is metaballs, an implicit model based on isosurfaces of potential fields. This technique is suitable for deformable objects and CSG model.For rendering ... -
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 ... -
An Inexpensive BRDF Model for Physically-based Rendering
(Blackwell Science Ltd and the Eurographics Association, 1994)A new BRDF model is presented which can be viewed as an kind of intermediary model between empirism and theory. Main results of physics are observed (energy conservation, reciprocity rule, microfacet theory) and numerous ... -
COMPUTER GRAPHICS AND REMOTE SENSING - A SYNTHESIS FOR ENVIRONMENTAL PLANNING AND CIVIL ENGINEERING
(Blackwell Science Ltd and the Eurographics Association, 1994)This paper presents efforts undertaken in the field of photo-realistic visualization of natural landscapes using digital elevation models (DEM) and images generated by remote sensing techniques. The remote sensing systems ... -
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, ... -
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 ... -
A Semantics-based Approach for the Design and Implementation of Interaction Objects
(Blackwell Science Ltd and the Eurographics Association, 1994)Although tools for developing graphical user interfaces are becoming increasingly popular, they do not usually highlight precisely which key elements developers should take into account. This still entails considerable ... -
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 ... -
Efficient self-collision detection on smoothly discretized surface animations using geometrical shape regularity
(Blackwell Science Ltd and the Eurographics Association, 1994)We present a new algorithm for detecting self-collisionson highly discretized moving polygonal surfaces. If is based on geometrical shape regularity properties that permit avoiding many useless collision tests. We use an ... -
A Hand Control and Automatic Grasping System for Synthetic Actors
(Blackwell Science Ltd and the Eurographics Association, 1994)In the computer animation field, the interest for grasping has appeared with the development of synthetic actors. Based on a grasp taxonomy, we propose a completely automatic grasping system for synthetic actors. In ... -
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 ... -
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 ... -
Fast Dynamic Tessellation of Trimmed NURBS Surfaced1
(Blackwell Science Ltd and the Eurographics Association, 1994)Trimmed NURBS (non-uniform rational B-splines) surfaces are being increasingly used and standardized in geometric modeling applications. Fast graphical processing of trimmed NURBS at interactive speeds is absolutely essential ... -
Spectral Data Modeling for a Lighting Application
(Blackwell Science Ltd and the Eurographics Association, 1994)In computer graphics, image generation uses the RGB colorimetric system. However, this system does not produce an accurate simulation of the spectral characteristics of both light and material, due to the fact that it is ... -
3D Visualization for 2D GIS: an Analysis of the Users Needs and a Review of Techniques*
(Blackwell Science Ltd and the Eurographics Association, 1994)Most of the existing geographical information systems (GIS) make limited use of algorithms for advanced computer graphics and visualization. One explanation is that few attempts are made to identify the visualization needs ... -
Constant-Time Filtering by Singular Value Decomposition?
(Blackwell Science Ltd and the Eurographics Association, 1994)We present a technique implementing space-variant filtering of an image, with kernels belonging to a given family, in time independent of the size and shape of the filter kernel support. The essence of our method is efficient ... -
A Survey of Shading and Reflectance Models
(Blackwell Science Ltd and the Eurographics Association, 1994)Since the beginning of computer graphics, three decades ago, a large number of models intended to describe the behaviour of light on a given point of a surface have been proposed. Almost every author uses his own terminology ... -
Wavelet Projections for Radiosity
(Blackwell Science Ltd and the Eurographics Association, 1994)One important goal of image synthesis research is to accelerate the process of obtaining realistic images using the radiosity method. Two important concepts recently introduced are the general framework of projection methods ...