Virtual Lectures

AIM@SHAPE Summerschool 2007: Shape Modeling and Reasoning by Remco_Veltkamp — last modified 2007-10-15 19:01

The AIM@SHAPE Summer School 2007 is organized and hosted by the Department of Computer Science (DISI) of the University of Genova, in collaboration with the Institute for Applied Mathematics and Information Technology of Italian National Research Council and the Israel Institute of Technology (TECHNION).

AIM@SHAPE Summerschool 2006: Applications of 3D Shapes by Remco_Veltkamp — last modified 2007-03-28 19:51

The purpose of this school is to give PhD students and Post Docs and opportunity * to get acquainted with the ongoing network activities * to find out how they can participate in them * to get hands-on training how they can use the network infrastructure like shape and tool repositories * to receive an introduction into ontologies and their use * to listen to and discuss with some leading experts in the field * to learn about important applications of shapes

AIM@SHAPE Summerschool 2005: Interactive Shape Modeling by Remco_Veltkamp — last modified 2007-03-28 19:51

AIM@SHAPE presents the state-of-the-art in digital modeling techniques, both in commercial software and academic research to Phd students or practioners in graphics. The goal of this school is to impart the audience with an understanding of the big open questions as well as the skills to engineer recent research in interactive shape modeling applications.

Summerschool 2007 on Multimedia Retrieval by Remco_Veltkamp — last modified 2007-10-16 13:52

After text retrieval, the next waves in web searching and multimedia retrieval are the search for and delivery of images, music, video, and 3D scenes. Not only the perceptual and cognitive aspects, but also many of the algorithmic and performance aspects are still badly understood. One relevant issue is the design of dissimilarity measures (distance functions) that have desired properties. Another aspect is the development of algorithms that can compute or approximate these distances efficiently. Indexing data structures and search algorithms are necessary to make the search more efficient than sequential browsing through large collections. Apart from provable properties of individual algorithms, the experimental verification of the performance of a complete retrieval system is important to analyse merits and drawbacks of certain approaches, and to compare various techniques.

Triangulations, Meshing and Geometric Modeling by Remco_Veltkamp — last modified 2007-03-28 20:27

Authors: Jean Daniel Boissonnat and Mariette Yvinec. This course proposes an introduction to the field of unstructured simplicial mesh generation,covering 2D and 3D volume meshes generation as well as the generation of surface meshes to approximate or reconstruct surfaces. The material presented here is especially focused on methods based on Delaunay refinement because of their ability to offer guaranteed results.

Advanced Computer Graphics by Remco_Veltkamp — last modified 2006-08-07 14:18

Author: Daniel Thalmann - This course will explain advanced concepts for modelling of graphical objects, transform them and give them realistic aspects. In particular, we will study natural phenomena using methods like fractals, L-systems, and particle systems. For the rendering, we will emphasize on complex problems of shadowing and lighting. Finally, a large part of the course will de dedicated to computer animation, particularly to problems of facial animation, crowd animation, behavioural animation, animation of deformable bodies, and cloth animation.

Virtual Reality by Remco_Veltkamp — last modified 2006-08-07 14:38

Author: Daniel Thalmann - The goal of this course is to present the concepts and the methods to carry out multi-media virtual environments. We thus explain how to build complex virtual worlds being able to be distributed on the networks. We introduce advanced concepts for real-time animation, 3d interaction, gesture recognition, audiospace, haptic rendering, collision detection and response, facial communication, voice recognition and synthesis. It is shown how to create avatars or clones 3d, how to create autonomous populations in the virtual worlds. We insist on concrete applications like 3d teleconferences, virtual surgery or interactive TV.

Shape Matching by Remco_Veltkamp — last modified 2006-03-30 04:38

Author: Remco Veltkamp - Shape matching is a central problem in visual information systems, computer vision, pattern recognition, and robotics. Applications of shape matching include industrial inspection, fingerprint matching, and content-based image retrieval.

SYNAPS by Remco_Veltkamp — last modified 2006-03-30 04:41

Author: Bernard Mourrain - In this tutorial, we briefly go through the main functionalities of the library SYNAPS. We first start with the main concepts, which underly the design of the library. Next, we show how to construct a first executable, using template structures from the standard library. The following step is devoted to linear algebra functions and the connection to the LAPACK library. Then we describe how to manipulate polynomials in one ore several variables, with different internal representation, including the Bernstein basis representation. In the next step, we describe how to use univariate and multivariate solvers. Finally, we illustrate the construction and manipulation of parameterized and implicit curves and surfaces. For each of these steps, we give code examples, that the reader can compile and run and we also propose exercises.

ReMESH by Remco_Veltkamp — last modified 2006-03-30 11:19

Author: Marco Attene - Research and software development involving geometry processing are often slowed down by the absence of suitable models for testing and benchmark purposes. In particular, when dealing with triangle meshes, a researcher may need to check the behavior of a new algorithm on several particular cases. In most situations, the test model is easily conceivable in mind but, at actual design time, its formalization turns out to be a much harder task than expected. Also, simple modifications over an existing triangle mesh may become a tedious work without a suitable interactive environment. In order to simplify the remeshing of existing models, we have developed ReMESH to interactively edit manifold triangle meshes, mostly through user friendly actions such as mouse clicks and drags. The tutorial covers several scenarios in which ReMESH is particularly useful, such as local editing of single surface primitives, automatic and user-assisted repairing of "bad" meshes (both in terms of topological flaws and geometrical degeneracies), global surface processing through a wide range of well-known algorithms, and so on. Some details about the underlying data-structure are discussed (type of meshes that can be treated, robustness issues, ...) to clarify what ReMESH can do in principle and to provide a deeper insight about some of the functionalities.

Mesh Simplification by Remco_Veltkamp — last modified 2006-03-30 11:22

Authors: Leila De Floriani, Enrico Puppo - This series of four lectures on mesh simplification are part of a Master and PhD course taught at Department of Computer Science of the University of Genova. In these lectures, we present algorithms for simplification of triangle meshes.

Level-Of-Detail Volume Meshes by Remco_Veltkamp — last modified 2006-03-30 11:23

Author: Leila De Floriani - These two lectures have been part of a Tutorial presented at Eurograhics 2004 [1]. In these lectures, we survey techniques for building, encoding and querying Level-Of-Detail (LOD) models of three-dimensional scalar fields. Such models encode the steps performed by a refinement process applied to a coarse mesh, or by a decimation process applied to the mesh at full resolution (connecting the original data points) in a compact data structure. In this way, a virtually continuous collection of simplified meshes at different LODs can be extracted. We focus on LOD models based on a domain decomposition into tetrahedral meshes. We, we classify them into irregular and regular LOD models depending on the mesh subdivision pattern and on the distribution of the data points. Within each class, we review data structures, construction algorithms, as well as techniques for extracting adaptively refined field representations from an LOD model.

Scientific Visualization by Remco_Veltkamp — last modified 2006-03-30 04:43

Author: Holger Theisel - Nowadays huge amounts of data are constantly created in various kinds of applications like medicine, engineering, science and industry. Due to the increasing size and complexity of the data, an effective data analysis is still a challenge. One approach to do so is to create a visualization in such a way that important properties and correlations of the data become visible in an intuitive way. The lecture gives an overview of the most important concepts and algorithms in data visualization. Advances and limitations of data visualization are discussed. In particular the lecture focuses on four data classes: multivariate data (spatial and temporal), volume data, flow data, and tensor data.

Facial Modeling and Animation by Remco_Veltkamp — last modified 2006-03-30 04:44

Lecturers: Volker Blanz, George Borshukov, Jörg Haber, Frederic I. Parke, Demetri Terzopoulos, Lance Williams - In this course we present an overview of the concepts and current techniques in facial modeling and animation. We introduce this research area by its history and applications. As a necessary prerequisite for facial modeling, data acquisition is discussed in detail. We describe basic concepts of facial animation and present different approaches including parametric models, performance-, physics-, and learning-based methods. State-of-the-art techniques such as muscle-based facial animation, massspring networks for skin models, and morphable models are part of these approaches. We furthermore discuss texturing of head models and rendering of skin, addressing problems related to texture synthesis and bump mapping with graphics hardware. Typical applications for facial modeling and animation such as medical and forensic applications (craniofacial surgery simulation, facial reconstruction from skull data, virtual aging) and animation techniques for movie production (case study of The Matrix sequels) are presented and explained.

3D Modeling by Remco_Veltkamp — last modified 2006-06-16 09:34

Authors: Patrick Min, Twan Maintz. The course treats fundamental 3D modeling techniques such as: * parametric curves and surfaces, implicit surfaces, Bezier curves and surfaces, sweep surfaces * shape acquisition techniques * polygonal meshes, mesh compression, fractals, subdivision surfaces, spatial subdivisions * constructive solid geometry, model hierarchies, level of detail * physically-based modelling, particle systems, shape grammars * animation

Methods for Analyzing Discrete Surfaces and Their Applications by Remco_Veltkamp — last modified 2006-06-17 06:24

Authors: Silvia Biasotti, Giuseppe Patane - These lectures deal with computational geometry and topology, and they tackle the problem of analyzing, representing, and abstracting surfaces represented by triangle meshes, that is, piecewise linear surfaces which enable a simple representation of 3D models commonly used in mathematics and computer science. Triangulated surfaces are generated by polygonizing implicit functions, or sampling parametric surfaces, or scanning real 3D objects with optical devices. All these generation processes provide complex discrete models with arbitrary genus and curvature which are usually unsatisfactory for mathematical modelling (i.e., topological and geometric analysis), numerical simulations, and approximation. In fact, they may consist of a huge number of vertices many of them being redundant, and the vertex sampling as well as the mesh connectivity may be irregular. Beside the reduction of the complexity and optimization of a given surface M, properties such as normal vectors, curvature values, and critical points, provide only local information about the geometric and topological features of M and they lack in providing a global characterization of M. Therefore, we discuss how to associate a set of high-level representations to M that extract and organize the geometric and topological information of M to reflect and/or to make explicit its sub-parts.

Training on Standards by Remco_Veltkamp — last modified 2006-03-06 17:11

 

Features for Industrial Design by Remco_Veltcamp — last modified 2006-08-26 22:27

This document is the material used at the summer school, July 2005, Darmstadt. It describes how fully free-form features can be generated and structured for the industrial design area. The proposed approach is based on deformation engine applicable to a set of trimmed B-spline patches as they are available in industrial CAD software. A taxonomy of features is presented, which fits with the designer's needs.

Hierarchical Modeling with Parametric Surfaces by Stefanie_Hahmann — last modified 2006-08-26 22:27

 

3D Anatomical Human by Remco_Veltkamp — last modified 2008-03-12 15:18

Authors: Prof. Nadia Magnenat-Thalmann, G. Guillard, L. Assassi, C. Charbonnier, B. Gilles Our research here consists of understanding and visualizing the functionalities of human articulations. In order to achieve this goal, a particular articulation, the hip, has been selected. From MRI data we shall reconstruct: segment bones, cartilage, ligaments and muscles. Biomechanical inter-relationships will also be modeled and the entire structure will be generalized to any individual. Medical doctors will benefit from this technology as they will be able to visualize (in 3D), observe motion and easily diagnose possible problems for the hip of a specific individual.

3D Modeling by Remco_Veltkamp — last modified 2008-03-12 15:28

Authors: Prof. Nadia Magnenat-Thalmann, G. Guillard, L. Assassi, C. Charbonnier, B. Gilles Our research here consists of understanding and visualizing the functionalities of human articulations. In order to achieve this goal, a particular articulation, the hip, has been selected. From MRI data we shall reconstruct: segment bones, cartilage, ligaments and muscles. Biomechanical inter-relationships will also be modeled and the entire structure will be generalized to any individual. Medical doctors will benefit from this technology as they will be able to visualize (in 3D), observe motion and easily diagnose possible problems for the hip of a specific individual.