Browsing Issue 3 by Title
Now showing items 26-44 of 44
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A Paradigm for the Robust Design of Algorithms for Geometric Modeling
(Blackwell Science Ltd and the Eurographics Association, 1994)Geometric modelers are becoming faster and more powerful, but they still suffer from reliability problems because of floating point errors. Previous work in the field of robust geometric modeling tends to be problem specific ... -
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 ... -
PREMO - An Initial Approach to a Formal Definition
(Blackwell Science Ltd and the Eurographics Association, 1994)Many descriptions of multimedia programming systems are starting to appear in the literature, but little work has yet been done on how to formally specify and reason about such systems. This paper is a contribution on the ... -
Raycasting of Nonregularly Structured Volume Data
(Blackwell Science Ltd and the Eurographics Association, 1994)Raycasting is an efficient, but computation-intensive technique for the direct rendering of volumetric data. Nonregularly structured volume data is produced in a variety of applications, such as numerical simulation, ... -
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, ... -
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 ... -
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 ... -
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 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 ... -
Sketching 3D models with 2D interaction devices
(Blackwell Science Ltd and the Eurographics Association, 1994)The creation of a 3D shape using CAD tools, namely solid modelers, is difficult and time-consuming. Therefore, these systems are kept away from the conceptual phases of design, perhaps the most important in any product ... -
Skylight for Interior Lighting Design
(Blackwell Science Ltd and the Eurographics Association, 1994)It is inevitable for indoor lighting design to render a room lit by natural light, especially for an atelier or an indoor pool where there are many windows. This paper proposes a method for calculating the illuminance due ... -
Solid Modeling Based on a New Paradigm
(Blackwell Science Ltd and the Eurographics Association, 1994)The technique of solid modeling is essential in CAD/CAM applications, and is currently well established. However, problems remain, such as the lack of uniformity in geometric computations and the lack of stability of Boolean ... -
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 ... -
Towards Context- Dependent Interpolation of Digital Elevation Models
(Blackwell Science Ltd and the Eurographics Association, 1994)The fractional Brownian motion (fBm) model has become increasingly popular in recent years as a mechanism for the synthesis of many natural phenomena. Unfortunately, the required interdependence of neighbouring points over ... -
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 ... -
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 ... -
Vector Fields: an Interactive Tool for Animation, Modeling and Simulation with Physically Based 3D Particle Systems and Soft Objects
(Blackwell Science Ltd and the Eurographics Association, 1994)Vectorfields have traditionally been used in computer graphics as a means of visualizing models over time. This paper presents a system which extends the use of vector fields as an interactive tool for physically based ... -
Visualization of Regular Polytopes in Three and Four Dimensions
(Blackwell Science Ltd and the Eurographics Association, 1994)Nontrivial regular polytopes only exist in three and four dimensions. This paper describes a software package that allows to interactively visualize and analyze these regular polytopes. The following four tools are available: ... -
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 ...