Browsing Issue 3 by Issue Date
Now showing items 21-40 of 41
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An Algorithmic Reflectance and Transmittance Model for Plant Tissue
(Blackwell Publishers Ltd and the Eurographics Association, 1997)Recent developments in rendering have provided very realistic images. However, these images rarely show organic objects. We believe that one of the main difficulties of rendering these objects realistically is the lack of ... -
Growing and Animating Polygonal Models of Animals
(Blackwell Publishers Ltd and the Eurographics Association, 1997)While there exist many computer models of animal bodies, as polygonal meshes and parametric surfaces, these are difficult to modify to take growth into account, or to animate. Growth data available from the literature ... -
A Muscle-based Feed-forward Controller of the Human Body
(Blackwell Publishers Ltd and the Eurographics Association, 1997)There is an increasing demand for human body motion data. Motion capture and physical animation have been used to generate such data. It is, however, apparent that such methods cannot automatically generate arbitrary human ... -
A Flexible Architecture for Virtual Humans in Networked Collaborative Virtual Environments
(Blackwell Publishers Ltd and the Eurographics Association, 1997)Complex virtual human representation provides more natural interaction and communication among participants in networked virtual environments, hence it is expected to increase the sense of being together within the same ... -
Stochastic Dynamics: Simulating the Effects of Turbulence on Flexible Structures
(Blackwell Publishers Ltd and the Eurographics Association, 1997)This paper addresses the problem of realistically simulating the motion of tree-branches subjected to turbulence. Since the resulting motion is random in nature, we model it as a stochastic process. We synthesize this ... -
Finally Everyone Can Work With Highly Complex 3D Models
(Blackwell Publishers Ltd and the Eurographics Association, 1997)In the past, access to 3D databases was restricted to few specialists having the appropriate CAD skills, software, and graphics hardware.The availability of inexpensive graphics support on personal computers, the Internetâ ... -
Efficient Impostor Manipulation for Real-Time Visualization of Urban Scenery
(Blackwell Publishers Ltd and the Eurographics Association, 1997)Urban environments present unique challenges to interactive visualization systems, because of the huge complexity of the geometrical data and the widely varying visibility conditions. This paper introduces a new framework ... -
Interactive High-Quality Soft Shadows in Scenes with Moving Objects
(Blackwell Publishers Ltd and the Eurographics Association, 1997)Interactive rendering of soft shadows (or penumbra) in scenes with moving objects is a challenging problem. High quality walkthrough rendering of static scenes with penumbra can be achieved using pre-calculated discontinuity ... -
Steering Image Generation with Wavelet Based Perceptual Metric
(Blackwell Publishers Ltd and the Eurographics Association, 1997)It is often the case that images generated by image synthesis algorithms are judged by visual examination. The user resorts to an iterative refinement process of inspection and rendering until a satisfactory image is ... -
Fast Analytic Shading and Shadowing for Area Light Sources
(Blackwell Publishers Ltd and the Eurographics Association, 1997)This paper describes a fast analytic algorithm that generates exact highlights and soft shadows from area light sources. In order to realize fast shadowing, we propose the ray-oriented buffer which segments 3D space by ... -
An Analysis of Quasi-Monte Carlo Integration Applied to the Transillumination Radiosity Method
(Blackwell Publishers Ltd and the Eurographics Association, 1997)This paper presents an enhanced transillumination radiosity method that can provide accurate solutions at relatively low computational cost. The proposed algorithm breaks down the double integral of the gathered power to ... -
A Rendering Equation for Specular Transfers and Its Integration into Global Illumination
(Blackwell Publishers Ltd and the Eurographics Association, 1997)In this paper, we present a rigorous theoretical formulation of the fundamental problem-indirect illumination from area sources via curved ideal specular surfaces. Intensity and area factors are introduced to clarify this ... -
Generating Reflected Directions from BRDF Data
(Blackwell Publishers Ltd and the Eurographics Association, 1997)Monte-Carlo path tracing algorithms for computer graphics require that given an incident light ray at a surface an outgoing direction can be computed with a distribution given by the magnitude of the bidirectional reflectance ... -
Painting-like Image Emphasis based on Human Vision Systems
(Blackwell Publishers Ltd and the Eurographics Association, 1997)Regional image emphasis is often evident in paintings and illustrations. This technique increases local contrast while reducing global contrast by amplifying image intensity on shadowed surfaces, reducing intensity on ... -
Optimal Source Selection in Shooting Random Walk Monte Carlo Radiosity
(Blackwell Publishers Ltd and the Eurographics Association, 1997)In this paper we study how to optimally select between different sources in shooting random walk Monte Carlo Radiosity. Until now the probability of selecting a source has been made proportional to the importance of that ... -
Tunnel-Free Supercover 3D Polygons and Polyhedra
(Blackwell Publishers Ltd and the Eurographics Association, 1997)A new discrete 3D line and 3D polygon, called Supercover 3D line and Supercover 3D polygon, are introduced. Analytical definitions are provided. The Supercover 3D polygon is a tunnel free plane segment defined by vertices ... -
Virtually Documented Environments: A New Interface Paradigm for Task-oriented Access to Information
(Blackwell Publishers Ltd and the Eurographics Association, 1997)We present a suitable virtually documented environment system providing the user with high level interaction possibilities. The system is dedicated to applications where the operator needs to have his hands free in order ... -
Bounded Radiosity - Illumination on General Surfaces and Clusters
(Blackwell Publishers Ltd and the Eurographics Association, 1997)Traditionally, Radiosity algorithms have been restricted to scenes made from planar patches. Most algorithms for computing form factors and the subdivision criterion for hierarchical methods implicitly assume planar patches. ... -
Robust Computation of Intersection Graph between Two Solids
(Blackwell Publishers Ltd and the Eurographics Association, 1997)We propose a new robust algorithm for Boolean operations on solid models. The algorithm produces a consistent intersection graph between two input solids whose geometrical data are represented in floating point numbers. ... -
A Framework for Interacting with Paper
(Blackwell Publishers Ltd and the Eurographics Association, 1997)This paper reports on ways of using digitised video from television cameras in user interfaces for computer systems. The DigitalDesk is built around an ordinary physical desk and can be used as such, but it has extra ...