Volume 24 (2005)

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EG Editorial
(The Eurographics Association and Blackwell Publishing Ltd., 2005)
Adaptive Deformable Models for Graphics and Vision
(The Eurographics Association and Blackwell Publishing Ltd., 2005) Goldenstein, Siome; Vogler, Christian; Velho, Luiz
Deformable models are a powerful tool in both computer graphics and computer vision. The description and implementation of the deformations have to be simultaneously flexible and powerful, otherwise the technique may not satisfy the requirements of all the distinct applications. In this paper, we introduce a new method for the deformable model specification: deformable fields. Deformable fields are conceptually simple, lead to an easy implementation, and are suitable for adaptive models. We apply our new technique to describe an adaptive deformable face, and compare three different adaptation strategies. We show how our technique is suitable to describe different individuals, how to construct a model based on information from a single image, and how it allows the tracking of the deformation parameters over a video sequence.
Constrained Visualization Using the Shepard Interpolation Family
(The Eurographics Association and Blackwell Publishing Ltd., 2005) Brodlie, K. W.; Asim, M. R.; Unsworth, K.
This paper discusses the problem of visualizing data where there are underlying constraints that must be preserved. For example, we may know that the data are inherently positive. We show how the Modified Quadratic Shepard method, which interpolates scattered data of any dimensionality, can be constrained to preserve positivity. We do this by forcing the quadratic basis functions to be positive. The method can be extended to handle other types of constraints, including lower bound of 0 and upper bound of 1-as occurs with fractional data. A further extension allows general range restrictions, creating an interpolant that lies between any two specified functions as the lower and upper bounds.
A Data-Driven Approach for Real-Time Clothes Simulation
(The Eurographics Association and Blackwell Publishing Ltd., 2005) Cordier, Frederic; Magnenat-Thalmann, Nadia
A data-driven approach for the real-time processing of clothes, particularly suitable for simulating dresses worn by virtual characters, is proposed. It starts, prior to real-time simulation, by analyzing cloth behavior in relation to the underlying skeleton movement from a presimulated sequence of the cloth obtained using any high-quality off-line simulators. The idea is to use this analysis to find an optimal combination of physics-based simulation and geometric approximation of the simulator; potentially colliding regions are defined on the cloth such that they will hold true for the skeleton movement that closely matches that of presimulated sequence. At runtime, using these analyses, our simulation process provides both visually pleasing results and performance, as long as the motion of the character remains sufficiently close to the original sequence used for the precomputation.The key contributions of this paper are (1) efficient collision handling that prunes out potentially colliding objects by using the off-line simulation sequence as examples; (2) data-driven fix-up process for the coarse mesh simulation that deduces the gross behavior of the cloth; and (3) geometric approximation of the fine mesh deformation, responsible for details in the shape of the cloth such as wrinkles.
Interactive Design of Botanical Trees using Freehand Sketches and Example-based Editing
(The Eurographics Association and Blackwell Publishing, Inc, 2005) Okabe, Makoto; Owada, Shigeru; Igarash, Takeo
GeoFilter: Geometric Selection of Mesh Filter Parameters
(The Eurographics Association and Blackwell Publishing, Inc, 2005) Kim, ByungMoon; Rossignac, Jarek
Collision Detection for Deformable Objects
(The Eurographics Association and Blackwell Publishing Ltd., 2005) Teschner, M.; Kimmerle, S.; Heidelberger, B.; Zachmann, G.; Raghupathi, L.; Fuhrmann, A.; Cani, M.-P.; Faure, F.; Magnenat-Thalmann, N.; Strasser, W.; Volino, P.
Interactive environments for dynamically deforming objects play an important role in surgery simulation and entertainment technology. These environments require fast deformable models and very efficient collision handling techniques. While collision detection for rigid bodies is well investigated, collision detection for deformable objects introduces additional challenging problems. This paper focuses on these aspects and summarizes recent research in the area of deformable collision detection. Various approaches based on bounding volume hierarchies, distance fields and spatial partitioning are discussed. In addition, image-space techniques and stochastic methods are considered. Applications in cloth modeling and surgical simulation are presented.
Semanticons: Visual Metaphors as File Icons
(The Eurographics Association and Blackwell Publishing, Inc, 2005) Setlur, Vidya; Albrecht-Buehler, Conrad; Gooch, Amy A.; Rossoff, Sam; Gooch, Bruce
Eurographics Awards Programme
(The Eurographics Association and Blackwell Publishing Ltd., 2005)
Automatic Synchronization of Background Music and Motion in Computer Animation
(The Eurographics Association and Blackwell Publishing, Inc, 2005) Lee, Hyun-Chul; Lee, In-Kwon
Virtual Endoscopy in Research and Clinical Practice
(The Eurographics Association and Blackwell Publishing Ltd., 2005) Bartz, Dirk
Virtual endoscopy is among the most active topics in virtual medicine and medical imaging. It focuses on the virtual representation of minimally invasive procedures for training, planning and diagnosis without an actual invasive intervention. In the past few years, virtual endoscopy modes have been transferred from research systems in virtually every commercial medical imaging software, but with varying quality and flexibility. This report covers concepts used in current systems in research and products, and how they might be applied to daily practice in health care. Specifically, I will start with an introduction into virtual endoscopy and the related medical field. This will also include typical scenarios of virtual endoscopy applications as they appear in clinical practice. This part will be followed by a discussion of the technical issues of virtual endoscopy and how they are addressed in currently available systems. Among these issues are navigation through the respective body organ and the orientation aids for the users. In addition, I will highlight the different rendering techniques used and its impact on rendering speed and quality.
A Family of Inexpensive Sampling Schemes
(The Eurographics Association and Blackwell Publishing Ltd., 2005) Hasselgren, Jon; Akenine-Moeller, Tomas; Laine, Samuli
To improve image quality in computer graphics, antialiazing techniques such as supersampling and multisampling are used. We explore a family of inexpensive sampling schemes that cost as little as 1.25 samples per pixel and up to 2.0 samples per pixel. By placing sample points in the corners or on the edges of the pixels, sharing can occur between pixels, and this makes it possible to create inexpensive sampling schemes. Using an evaluation and optimization framework, we present optimized sampling patterns costing 1.25, 1.5, 1.75 and 2.0 samples per pixel.
Author Index Volume 24 (2005)
(The Eurographics Association and Blackwell Publishing Ltd., 2005)
REPORT OF THE STATUTORY AUDITORS TO THE GENERAL MEETING OF THE MEMBERS OF EUROGRAPHICS ASSOCIATION GENEVA
(The Eurographics Association and Blackwell Publishing Ltd., 2005)
Acquisition, Synthesis, and Rendering of Bidirectional Texture Functions
(The Eurographics Association and Blackwell Publishing Ltd., 2005) Mueller, G.; Meseth, J.; Sattler, M.; Sarlette, R.; Klein, R.
One of the main challenges in computer graphics is still the realistic rendering of complex materials such as fabric or skin. The difficulty arises from the complex meso structure and reflectance behavior defining the unique look-and-feel of a material. A wide class of such realistic materials can be described as 2D-texture under varying light- and view direction, namely, the Bidirectional Texture Function (BTF). Since an easy and general method for modeling BTFs is not available, current research concentrates on image-based methods, which rely on measured BTFs (acquired real-world data) in combination with appropriate synthesis methods. Recent results have shown that this approach greatly improves the visual quality of rendered surfaces and therefore the quality of applications such as virtual prototyping. This state-of-the-art report (STAR) will present the techniques for the main tasks involved in producing photo-realistic renderings using measured BTFs in details.
Structure Preserving CAD Model Repair
(The Eurographics Association and Blackwell Publishing, Inc, 2005) Bischoff, Stephan; Kobbelt, Leif
The Occlusion Camera
(The Eurographics Association and Blackwell Publishing, Inc, 2005) Mei, Chunhui; Popescu, Voicu; Sacks, Elisha
Hierarchical Penumbra Casting
(The Eurographics Association and Blackwell Publishing, Inc, 2005) Laine, Samuli; Aila, Timo
Survey of Real-Time Rendering Techniques for Crowds
(The Eurographics Association and Blackwell Publishing Ltd., 2005) Ryder, G.; Day, A. M.
Real-time rendering of photo-realistic humans is considerably outside the scope of current consumer-level computer hardware. There are many techniques, which attempt to bridge the gap between what is desired and what is possible. This paper aims to give an overview of the techniques designed to alter the complexity of the model s geometry (level of detail), or replace it with a flat image (visual impostor) and to improve the lighting model (lighting and shadows). Recent years have shown a boom in the power and availability of consumer-level programmable graphics processors, thus techniques that make use of these features are coming to the forefront.
Efficient Animation of Point-Sampled Thin Shells
(The Eurographics Association and Blackwell Publishing, Inc, 2005) Wicke, Martin; Steinemann, Denis; Gross, Markus

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