Browsing EG1991 Proceedings (Technical Papers) by Title
Now showing items 3-22 of 40
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C 2 Gregory patch
(Eurographics Association, 1991)G² continuity of free-form surfaces is sometimes very important in engineering applications. The conditions for G2 continuity between two Bezier patches has been studied and methods developed to ensure such continuity. ... -
Colour Illustrations
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Combining Volume Rendering with Line and Surface Rendering
(Eurographics Association, 1991)Volume data is discrete sampled data in the three-dimensional space. Volume rendering is defined as volume visualization directly from volume primitives and not via surface primitives. Geometric objects are represented as ... -
Computational Physics : A Modeler - Simulator for animated physical Objects
(Eurographics Association, 1991)Physical modeling for animation is now firmly established. The present aim is to design and build a structured and well-defined tool rather than merely specific algorithms to simulate physical knowledge. We will first ... -
Configurable Representations in Feature-based Modelling
(Eurographics Association, 1991)A double description is proposed for the representation of a feature-based model which supports the distinction between form and functionality. This description consists of a primary representation in terms of geometric ... -
A constraint-based UIMS using graph unification
(Eurographics Association, 1991)This paper describes an experimental UIMS developed to investigate methods of combining and reusing objects within a constraint-based system. A novel approach based on graph-unification facilitated the definition of composite ... -
Construction Techniques of Graphic, Direct-Manipulation User Interfaces
(Eurographics Association, 1991)This paper deals with human-computer interaction in several ways. On the one hand it presents the roots of interactive, graphic user interfaces and how such interfaces are implemented on the abstraction level of programming ... -
Constructive Cubes: CSG Evaluation For Display Using Discrete 3-D Scalar Data Sets
(Eurographics Association, 1991)The algorithm presented in this paper converts a CSG model into a representation for interactive display on an engineering workstation. Called Constructive Cubes, the algorithm extends the standard CSG-point classification ... -
Constructive Page Description Opening Up the Prepress World
(Eurographics Association, 1991)Constructive Page Description (CPD) is an overall approach allowing different kinds of data to be exchanged between a variety of systems and manipulated in arbitrary system environments. Fully changeable pages, which keep ... -
Continuation Methods for Approximating Isovalued Complex Surfaces
(Eurographics Association, 1991)Basically there are two different approaches for rendering isovalued surfaces in 3D space: projection methods and surface reconstruction. We are discussing two algorithms of the second kind. Both use continuation methods ... -
A DDA Octree Traversal Algorithm for Ray Tracing
(Eurographics Association, 1991)A spatial traversal algorithm for ray tracing that combines the memory efficiency of an octree and the traversal speed of a uniform voxel space is described. A new octree representation is proposed and an implementation ... -
Declarative Graphics And Dynamic Interaction
(Eurographics Association, 1991)First order logic provides a means of integrating the specification and prototyping of interactive systems. It can describe graphical images in a declarative and order independent manner. It supports the definition of ... -
Discrepancy as a Quality Measure for Sample Distributions
(Eurographics Association, 1991)Discrepancy, a scalar measure of sample point equidistribution, is discussed in the context of Computer Graphics sampling problems. Several sampling strategies and their discrepancy characteristics are examined. The ... -
FACES: Facial Animation, Construction and Editing System
(Eurographics Association, 1991)The aim of the Facial Animation, Construction and Editing System (FACES) is to provide a software simulation of the human face. Attention has focused on the face as an important means of non-verbal communication. The ... -
Fast Rendering of General Ellipses
(Eurographics Association, 1991)Even though GKS did not include circles and, in a more general form, ellipses and elliptical arcs in the list of elementary graphics primitives, CGM settled this omission with its standardization in 1987. According to CGM ... -
Geometric Modelling from Range Image Data
(Eurographics Association, 1991)An adaptive surface fitting algorithm is proposed for modelling the digitized surface of a real object described by an array of 3D points sampled on a rectangular mesh and stored in the form of a range image. A G1 -piecewise ... -
Integrating Inheritance and Composition in an Objective Presentation Model for Multiple Media
(Eurographics Association, 1991)A formal model is presented which combines, in a single structure called a tangle, the power to express both the composition of aggregate objects, and the selective inheritance of object properties over a number of instances ... -
Interactive Conformance Testing for PHIGS
(Eurographics Association, 1991)Conformance testing for the Programmer’s Hierarchical Interactive Graphics System (PHIGS) standard presents certain novel difficulties, especially the indirect effect of many functions, and the inaccessibility to the program ... -
Interrogation of Offsets of Polynomial Surface Patches
(Eurographics Association, 1991)This paper presents an algorithm for computing the intersection of the offset (or parallel) surface of a polynomial surface patch ( rogenitor) of arbitrary degree, with a straight line. The rogenitor patch is expressed in ... -
Liberation from Flatland: 3D Interaction Based on the Desktop Bat
(Eurographics Association, 1991)A novel device for 3D interaction is introduced, the Desktop Bat. This device is an evolutionary development of a mouse. It is like a mouse in that it is used on a desktop, but provides 5 degrees of freedom since in ...