Volume 12 (1993): Recent submissions
Now showing items 21-40 of 62
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Nonsplitting Macro Patches for Implicit Cubic Spline Surfaces
(Blackwell Science Ltd and the Eurographics Association, 1993)Macro patches are important for generating quadric or cubic implicit spline surfaces from the input of a polyhedron. All existing macro patches split the triangular facets of the polyhedron- this paper presents cubic ... -
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 ... -
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 ... -
A Progressive Radiosity Algorithm for Scenes Containing Curved Surfaces
(Blackwell Science Ltd and the Eurographics Association, 1993)Based on the theory of light energy transfer between two differential diffuse surface areas, a generalized radiosity approach is presented. Unlike the conventional radiosity method, curved surfaces are subdivided into ... -
Abstract Interaction Objects
(Blackwell Science Ltd and the Eurographics Association, 1993)The concept of an interactor has been introduced by Faconti and Paterno [6] as an abstraction of an entity in interactive graphics capable of both input and output. However the notion of interaction object need not be ... -
A New Radiosity Approach Using Area Sampling for Parametric Patches
(Blackwell Science Ltd and the Eurographics Association, 1993)A high precision illumination model is indispensable for lighting simulation and realistic image synthesis. For the purpose of improving realism, research on global illumination has been done, and several papers on radiosity ... -
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 ... -
Photo-Realistic Imaging of Digital Terrains
(Blackwell Science Ltd and the Eurographics Association, 1993)We present a method for the generation of photo-realistic images of views over terrain datasets by mapping a digital aerial photograph on a perspective projection of a digital elevation map. We use high resolution for both ... -
On the Application of Quantization and Dithering Techniques to History of Arts
(Blackwell Science Ltd and the Eurographics Association, 1993)The diffusion of computing techniques within humane studies is considerably increasing, due to technological advances and reduction in computing costs, with History of Arts being one of the most interesting fields of ... -
Automatic Reconstruction of Buildings from Stereoscopic Image Sequences
(Blackwell Science Ltd and the Eurographics Association, 1993)A vision-based 3-D scene analysis system is described that is capable to model complex real-world scenes like streets and buildings automatically from stereoscopic image pairs. Input to the system is a sequence of stereoscopic ... -
Pseudo-Satellitefilm Using Fractal Clouds to Enhance Animated Weather Forecasting
(Blackwell Science Ltd and the Eurographics Association, 1993)We have developed a system enabling the National German Meteorological Office to generate pseudo-satellite images and video sequences based on their weather forecasting simulation data. With our system meteorologists can ... -
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 ... -
A 4D Ray Tracing
(Blackwell Science Ltd and the Eurographics Association, 1993)We are going to present a survey of techniques using temporal coherence in between frames to render animation sequences with ray tracing. A new method using temporal coherence in the ray space (lightpath of rays) is proposed. ... -
DaScript3D Integrating 3D Graphics in a Page Description Language
(Blackwell Science Ltd and the Eurographics Association, 1993)Despite the necessity of producing high-quality documents comprising all aspects of electronic publishing, there is still no system available that can generate and integrate two-dimensional (2D) graphics, three-dimensional ... -
The Cone of Normals Technique for Fast Processing of Curved Patches
(Blackwell Science Ltd and the Eurographics Association, 1993)The cone of normals technique for curved surface patches allows to perform various quick tests at the patch level such as front- or backfacing test, light influence test, and existence of silhouette edges test. For a given ... -
Accurate and Consistent Reconstruction of Illumination Functions Using Structured Sampling
(Blackwell Science Ltd and the Eurographics Association, 1993)The study of common classes of diffuse emitters, such as planar convex polygons, reveals several interesting properties of the functions of illumination these emitters cast on receiver surfaces. Some properties, such as ... -
Direct 3D Manipulation Techniques for Interactive Constraint-based Solid Modelling
(Blackwell Science Ltd and the Eurographics Association, 1993)This paper presents a novel constraint-based 3D manipulation approach to interactive constraint-based solid modelling. This approach employs a constraint recognition process to automatically recognise assembly relationships ... -
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 ... -
A Rendering Algorithm for Discrete Volume Density Objects
(Blackwell Science Ltd and the Eurographics Association, 1993)We present a new algorithm for simulating the effect of light travelling through volume objects. Such objects (haze, fog, clouds.) are usually modelized by voxel grids which define their density distribution in a discrete ... -
DIGIS A Graphical User Interface Design Environment for Non-Programmers
(Blackwell Science Ltd and the Eurographics Association, 1993)DIGIS (Direct Interactive Generation of Interactive Systems) is a graphical UI design environment for non-programmers that facilitates the design of all aspects of a UI with direct manipulation techniques. DIGIS is based ...