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2016 SIGGRAPH ASIA Symposium on visualization, SA 2016

作者： Demir, Ismail Jarmea, Mihaela Westermann, Rüdiger Computer Graphics and Visualization Group Technische Universitüt München Germany

ISBN: (纸本)9781450345477

We propose a new approach for analyzing the central tendency (centrality) of an ensemble of shapes in 2D or 3D space. Our approach provides means to determine the most central shape from a given set of shapes, to quantify the region-wise centrality of the shapes, and to compute a locally most representative shape. Unlike previous approaches, which build upon binary functions or signed distance fields to locate domain points with respect to orientable shapes, we introduce a closest point representation for the analysis of ensembles of shapes. By using this representation, our approach can handle arbitrary non-parametric shapes regardless of dimension and orientability. Shapes are first converted into an implicit representation based on vectors to closest surface points, and the resulting directional distributions are then used to perform region-wise classifications. Shapes are either analyzed separately by evaluating the classifications over the shape, or additional fields are derived from these classifications, in which specific shapes like the locally best mean are given as level-sets. We demonstrate the effectiveness of our approach on synthetic and weather forecast ensembles in 2D and 3D. © 2016 Copyright held by the owner/author(s).

关键词： visualization

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Corotated finite elements made fast and stable

Corotated finite elements made fast and stable

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5th Workshop on Virtual Reality Interactions and Physical Simulations, VRIPHYS 2008

作者： Georgii, Joachim Westermann, Rüdiger Computer Graphics and Visualization Group Technische Universität München Germany

ISBN: (纸本)9783905673708

Multigrid finite-element solvers using the corotational formulation of finite elements provide an attractive means for the simulation of deformable bodies exhibiting linear elastic response. The separation of rigid body motions from the total element motions using purely geometric methods or polar decomposition of the deformation gradient, however, can introduce instabilities for large element rotations and deformations. Furthermore, the integration of the corotational formulation into dynamic multigrid elasticity simulations requires to continually rebuild consistent system matrices at different resolution levels. The computational load imposed by these updates prohibits the use of large numbers of finite elements at rates comparable to the small-strain finite element formulation. To overcome the first problem, we present a new method to extract the rigid body motion from total finite element displacements based on energy minimization. This results in a very stable corotational formulation that only slightly increases the computational overhead. We address the second problem by introducing a novel algorithm for computing sparse products of the form RKRT, as they have to be evaluated to update the multigrid hierarchy. By reformulating the problem into the simultaneous processing of a sequential data and control stream, cache miss penalties are significantly reduced. Even though the algorithm increases memory requirements, it accelerates the multigrid FE simulation by a factor of up to 4 compared to previous multigrid approaches. Due to the proposed improvements, finite element deformable body simulations using the corotational formulation can be performed at rates of 17 tps for up to 12k elements. © The Eurographics Association 2008.

关键词： Deformation

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Interactive editing of GigaSample terrain fields

Interactive editing of GigaSample terrain fields

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33rd Annual Conference on European Association for computer graphics, EUROgraphics 2012

作者： Treib, Marc Reichl, Florian Auer, Stefan Westermann, Rüdiger Computer Graphics and Visualization Group Technische Universität München Germany

Previous terrain rendering approaches have addressed the aspect of data compression and fast decoding for rendering, but applications where the terrain is repeatedly modified and needs to be buffered on disk have not been considered so far. Such applications require both decoding and encoding to be faster than disk transfer. We present a novel approach for editing gigasample terrain fields at interactive rates and high quality. To achieve high decoding and encoding throughput, we employ a compression scheme for height and pixel maps based on a sparse wavelet representation. On recent GPUs it can encode and decode up to 270 and 730 MPix/s of color data, respectively, at compression rates and quality superior to JPEG, and it achieves more than twice these rates for lossless height field compression. The construction and rendering of a height field triangulation is avoided by using GPU ray-casting directly on the regular grid underlying the compression scheme. We show the efficiency of our method for interactive editing and continuous level-of-detail rendering of terrain fields comprised of several hundreds of gigasamples. © 2012 The Author(s).

关键词： Encoding (symbols)

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Clustering ensembles of 3D jet-stream core lines

Clustering ensembles of 3D jet-stream core lines

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2019 Conference on Vision, Modeling and visualization, VMV 2019

作者： Kern, Michael Westermann, Rüdiger Technische Universität München Chair of Computer Graphics and Visualization Germany

ISBN: (纸本)9783038680987

The extraction of a jet-stream core line in a wind field results in many disconnected line segments of arbitrary topology. In an ensemble of wind fields, these structures show high variation, coincide only partly, and almost nowhere agree in all ensemble members. In this paper, we shed light on the use of clustering for visualizing an ensemble of jet-stream core lines. Since classical approaches for clustering 3D line sets fail due to the mentioned properties, we analyze different strategies and compare them to each other: We cluster the 3D scalar fields from which jet-stream core lines are extracted. We cluster on a closest-point representation of each set of core lines. These representations are derived from the extracted line geometry and can be used independently of the line orientation and topology. We cluster on the 3D line set using the Hausdorff distance as similarity metric. In the resulting clusters, we visualize core lines from the most representative ensemble member. We further compute ridges in a single 3D visitation map that is build from the ensemble of core lines, and we extract the most central core line from the ensemble closest-point representation. These "averages" are compared to the clustering results, and they are put into relation to ground truth jet-stream core lines at the predicted lead time. © 2019 The Author(s) Eurographics Proceedings © 2019 The Eurographics Association.

关键词： Topology

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Interactive residual stress modeling for soft tissue simulation

Interactive residual stress modeling for soft tissue simulat...

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3rd Eurographics Workshop on VisualComputing in Biology and Medicine, EG VCBM 2012

作者： Wu, Jun Bürger, Kai Westermann, Rüdiger Dick, Christian Computer Graphics and Visualization Group Technische Universität München Germany

ISBN: (纸本)9783905674385

Residual stress is the stress which remains in a deformable body in the absence of external forces. Due to the release of residual stress after cutting, soft tissues will shrink and the wound will open. Thus, to realistically simulate soft tissue deformations due to cutting, a model for the residual stress in a patient body is needed. In this paper we present an interactive method to compute a physically meaningful patient-specific residual stress distribution. With our method, by using their experience doctors can sketch directional stress strokes and specify stress magnitudes at a few control points on the body surface. The residual stress is then immediately computed from these inputs and visualized by displaying the deformations of a set of control cuts on the body. In a visually guided session, the user can further modify the initial strokes and magnitudes until a sat isfactory result is obtained. We demonstrate the potential of the proposed method for virtual cut simulation by showing the variations of wound openings depending on the residual stress distribution. © The Eurographics Association 2012.

关键词： Residual stresses

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From imprecise user input to precise vessel segmentations

From imprecise user input to precise vessel segmentations

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3rd Eurographics Workshop on VisualComputing in Biology and Medicine, EG VCBM 2012

作者： Diepenbrock, S. Ropinski, T. Visualization and Computer Graphics Group University of Münster Germany Scientific Visualization Group Linköping University Sweden

ISBN: (纸本)9783905674385

Vessel segmentation is an important prerequisite for many medical applications. While automatic vessel segmentation is an active field of research, interaction and visualization techniques for semi-automatic solutions have gotten far less attention. Nevertheless, since automatic techniques do not generally achieve perfect results, interaction is necessary. Especially for tasks that require an in-detail inspection or analysis of the shape of vascular structures precise segmentations are essential. However, in many cases these can only be generated by incorporating expert knowledge. In this paper we propose a visual vessel segmentation system that allows the user to interactively generate vessel segmentations. Therefore, we employ multiple linked views which allow to assess different aspects of the segmentation and depict its different quality metrics. Based on these quality metrics, the user is guided, can assess the segmentation quality in detail and modify the segmentation accordingly. One common modification is the editing of branches, for which we propose a semi-automatic sketch-based interaction metaphor. Additionally, the user can also influence the shape of the vessel wall or the centerline through sketching. To assess the value of our system we discuss feedback from medical experts and have performed a thorough evaluation. © The Eurographics Association 2012.

关键词： Medical applications

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Efficient finite element methods for deformable bodies in medical applications

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Critical Reviews in Biomedical Engineering 2012年第2期40卷 155-172页

作者： Georgii, Joachim Dick, Christian Fraunhofer MEVIS Institute for Medical Image Computing Bremen Germany Computer Graphics and Visualization Group Technische Universität München Germany

Simulation techniques for deformable bodies are of major relevance for a broad range of medical applications. In recent decades, a lot of work has been performed to improve simulation methods, allowing interactivity or even real time. However, this work often focused on applications such as computer games or virtual environments, where physical accuracy is not a primary goal. The goal of this report is to give an overview of efficient physics-based techniques for deformable objects, focusing on finite element methods, and to discuss the applicability of these techniques in medical scenarios. As a result, we focus on techniques that are amenable to simulating highly resolved meshes, which for instance can be generated from computed tomography (CT) or magnetic resonance (MR) images, and we review the so-called corotated finite element method that has shown a high potential in recent years. Specifically, we will capture in detail the related work in this field and demonstrate the current state of the art in efficient deformable bodies simulations. © 2012 Begell House, Inc.

关键词： Medical applications

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AR-Campus 1

AR-Campus

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1st IEEE International Augmented Reality Toolkit Workshop, ART 2002

作者： Hinn, R. Redmer, B. Domik, G. University of Paderborn Computer Science Computer Graphics Visualization and Image Processing Fiirstenallee 11 Paderborn33102 Germany

AR-Campus is an augmented reality application, designed as a guide through university campus. it offers a 3-D map of the campus area, shows routes to various buildings and offices, and recognizes name tags of universi... 详细信息

ISBN: (纸本)0780376803

关键词： Augmented reality

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UberFlow: A GPU-based particle engine 04

UberFlow: A GPU-based particle engine

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ACM SIGGRAPH 2004 Sketches

作者： Kipfer, Peter Segal, Mark Westermann, Rüdiger Computer Graphics and Visualization Technische Universitát München ATI Research Germany

ISBN: (纸本)9781581138962

We present a system for real-time animation of large particle sets using GPU computation and memory objects in OpenGL. Our system implements a versatile particle engine, including inter-particle collisions and visibility sorting. By combining memory objects with floating-point fragment programs, we have implemented a particle engine that entirely avoids the transfer of particle data at runtime. © 2004 ACM.

关键词： Engines

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Bridging the Distance in Education: Design and Implementation of a Synchronous, Browser-Based VR Remote Teaching Tool

Bridging the Distance in Education: Design and Implementatio...

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45th Annual Conference on European Association for computer graphics, EUROgraphics 2024

作者： Pehlić, Abdulmelik Augsdörfer, Ursula Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria

ISBN: (纸本)9783038682387

The rapid shift to remote education has presented numerous challenges for educators and students alike. Virtual Reality (VR) has emerged as a promising solution, offering immersive and interactive learning experiences. We design and implement a synchronous, browser-based VR teaching tool. The tool is compatible with budget VR equipment and enables meaningful engagement between teachers and students in a virtual setting, as well as active participation and interaction across a range of platforms, thus solving a range of disadvantages of current approaches. © 2024 The Authors.

关键词： Virtual environments

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