TY - CHAP A1 - Allen, Gabrielle A1 - Dramlitsch, Thomas A1 - Goodale, Tom A1 - Lanfermann, Gerd A1 - Radke, Thomas A1 - Seidel, Edward A1 - Kielmann, Thilo A1 - Verstoep, Kees A1 - Balaton, Zoltán A1 - Kacsuk, Péter A1 - Szalai, Ferenc A1 - Gehring, Jörn A1 - Keller, Axel A1 - Streit, Achim A1 - Matyska, Ludek A1 - Ruda, Miroslav A1 - Krenek, Ales A1 - Knipp, Harald A1 - Merzky, André A1 - Reinefeld, Alexander A1 - Schintke, Florian A1 - Ludwiczak, Bogdan A1 - Nabrzyski, Jarek A1 - Pukacki, Juliusz A1 - Kersken, Hans-Peter A1 - Aloisio, Giovanni A1 - Cafaro, Massimo A1 - Ziegler, Wolfgang A1 - Russell, Michael T1 - Early experiences with the EGrid testbed T2 - Proceedings First IEEE/ACM International Symposium on Cluster Computing and the Grid Y1 - 2001 U6 - https://doi.org/10.1109/CCGRID.2001.923185 SP - 130 EP - 137 ER - TY - JOUR A1 - Theisel, Holger A1 - Weinkauf, Tino A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Topological methods for 2D time-dependent vector fields based on stream lines and path lines JF - IEEE Transactions on Visualization and Computer Graphics Y1 - 2005 U6 - https://doi.org/10.1109/TVCG.2005.68 VL - 11 IS - 4 ER - TY - CHAP A1 - Theisel, Holger A1 - Weinkauf, Tino A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Saddle Connectors - An Approach to Visualizing the Topological Skeleton of Complex 3D Vector Fields T2 - Proc. IEEE Visualization 2003 Y1 - 2003 U6 - https://doi.org/10.1109/VISUAL.2003.1250376 SP - 225 EP - 232 CY - Seattle ER - TY - CHAP A1 - Theisel, Holger A1 - Weinkauf, Tino A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Grid-independent detection of closed stream lines in 2D vector fields T2 - Proc. Vision, Modeling and Visualization 2004 Y1 - 2004 SP - 421 EP - 428 CY - Stanford, U.S.A. ER - TY - CHAP A1 - Theisel, Holger A1 - Weinkauf, Tino A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Stream line and path line oriented topology for 2D time-dependent vector fields T2 - Proc. IEEE Visualization 2004 Y1 - 2004 U6 - https://doi.org/10.1109/VIS.2004.99 SP - 321 EP - 328 CY - Austin, U.S.A. ER - TY - CHAP A1 - Weinkauf, Tino A1 - Theisel, Holger A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Topological construction and visualization of higher order 3D vector fields T2 - Computer Graphics Forum Y1 - 2004 U6 - https://doi.org/10.1109/VISUAL.2005.1532842 VL - 23(3) SP - 469 EP - 478 CY - Grenoble, France ER - TY - CHAP A1 - Weinkauf, Tino A1 - Theisel, Holger A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Boundary switch connectors for topological visualization of complex 3D vector fields T2 - Proc. Joint Eurographics - IEEE TCVG Symposium on Visualization (VisSym ’04) Y1 - 2004 SP - 183 EP - 192 CY - Konstanz, Germany ER - TY - JOUR A1 - Shi, Kuangyu A1 - Weinkauf, Tino A1 - Theisel, Holger A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Visualizing Transport Structures of Time-Dependent Flow Fields JF - IEEE Computer Graphics and Applications Y1 - 2008 U6 - https://doi.org/10.1109/MCG.2008.106 SP - 24 EP - 35 ER - TY - CHAP A1 - Shi, Kuangyu A1 - Theisel, Holger A1 - Weinkauf, Tino A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Finite-Time Transport Structures of Flow Fields T2 - Proc. IEEE Pacific Visualization 2008 Y1 - 2008 U6 - https://doi.org/10.1109/PACIFICVIS.2008.4475460 SP - 63 EP - 70 CY - Kyoto, Japan ER - TY - GEN A1 - Shi, Kuangyu A1 - Theisel, Holger A1 - Weinkauf, Tino A1 - Hauser, Helwig A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Extracting separation surfaces of path line oriented topology in periodic 2D time-dependent vector fields Y1 - 2007 SP - 75 EP - 82 ER - TY - CHAP A1 - Shi, Kuangyu A1 - Theisel, Holger A1 - Hauser, Helwig A1 - Weinkauf, Tino A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Path Line Attributes - an Information Visualization Approach to Analyzing the Dynamic Behavior of 3D Time-Dependent Flow Fields T2 - Topology-Based Methods in Visualization II Y1 - 2009 U6 - https://doi.org/10.1007/978-3-540-88606-8_6 SP - 75 EP - 88 PB - Springer CY - Berlin ER - TY - CHAP A1 - Weinkauf, Tino A1 - Theisel, Holger A1 - Shi, Kuangyu A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Topological simplification of 3D vector fields and extracting higher order critical points T2 - Proc. IEEE Visualization 2005 Y1 - 2005 SP - 631 EP - 638 CY - Minneapolis, USA ER - TY - CHAP A1 - Weinkauf, Tino A1 - Theisel, Holger A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Feature Flow Fields in Out-of-Core Settings T2 - Topology-based Methods in Visualization Y1 - 2007 SP - 51 EP - 64 PB - Springer ER - TY - CHAP A1 - Weinkauf, Tino A1 - Sahner, Jan A1 - Theisel, Holger A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - A unified feature extraction architecture T2 - Active Flow Control Y1 - 2007 U6 - https://doi.org/10.1007/978-3-540-71439-2_8 SP - 119 EP - 133 PB - Springer Berlin/Heidelberg ER - TY - CHAP A1 - Shi, Kuangyu A1 - Theisel, Holger A1 - Weinkauf, Tino A1 - Hauser, Helwig A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Path line oriented topology for periodic 2D time-dependent vector fields T2 - Proc. Eurographics / IEEE VGTC Symposium on Visualization Y1 - 2006 SP - 139 EP - 146 CY - Lisbon, Portugal ER - TY - JOUR A1 - Weinkauf, Tino A1 - Theisel, Holger A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Topological structures in two-parameter-dependent 2D vector fields JF - Computer Graphics Forum Y1 - 2006 U6 - https://doi.org/10.1111/j.1467-8659.2006.00980.x VL - 25 (3) SP - 607 EP - 616 ER - TY - CHAP A1 - Theisel, Holger A1 - Sahner, Jan A1 - Weinkauf, Tino A1 - Hege, Hans-Christian A1 - Seidel, Hans-Peter T1 - Extraction of parallel vector surfaces in 3D time-dependent fields and application to vortex core line tracking T2 - Proc. IEEE Visualization 2005 Y1 - 2005 SP - 559 EP - 566 CY - Minneapolis, USA ER - TY - JOUR A1 - Tycowicz, Christoph von A1 - Schulz, Christian A1 - Seidel, Hans-Peter A1 - Hildebrandt, Klaus T1 - Real-time Nonlinear Shape Interpolation JF - ACM Transactions on Graphics N2 - We introduce a scheme for real-time nonlinear interpolation of a set of shapes. The scheme exploits the structure of the shape interpolation problem, in particular, the fact that the set of all possible interpolated shapes is a low-dimensional object in a high-dimensional shape space. The interpolated shapes are defined as the minimizers of a nonlinear objective functional on the shape space. Our approach is to construct a reduced optimization problem that approximates its unreduced counterpart and can be solved in milliseconds. To achieve this, we restrict the optimization to a low-dimensional subspace that is specifically designed for the shape interpolation problem. The construction of the subspace is based on two components: a formula for the calculation of derivatives of the interpolated shapes and a Krylov-type sequence that combines the derivatives and the Hessian of the objective functional. To make the computational cost for solving the reduced optimization problem independent of the resolution of the example shapes, we combine the dimensional reduction with schemes for the efficient approximation of the reduced nonlinear objective functional and its gradient. In our experiments, we obtain rates of 20-100 interpolated shapes per second even for the largest examples which have 500k vertices per example shape. Y1 - 2015 U6 - https://doi.org/10.1145/2729972 VL - 34 IS - 3 SP - 34:1 EP - 34:10 ER - TY - CHAP A1 - Schulz, Christian A1 - Tycowicz, Christoph von A1 - Seidel, Hans-Peter A1 - Hildebrandt, Klaus T1 - Animating articulated characters using wiggly splines T2 - ACM SIGGRAPH / Eurographics Symposium on Computer Animation N2 - We propose a new framework for spacetime optimization that can generate artistic motion with a long planning horizon for complex virtual characters. The scheme can be used for generating general types of motion and neither requires motion capture data nor an initial motion that satisfies the constraints. Our modeling of the spacetime optimization combines linearized dynamics and a novel warping scheme for articulated characters. We show that the optimal motions can be described using a combination of vibration modes, wiggly splines, and our warping scheme. This enables us to restrict the optimization to low-dimensional spaces of explicitly parametrized motions. Thereby the computation of an optimal motion is reduced to a low-dimensional non-linear least squares problem, which can be solved with standard solvers. We show examples of motions created by specifying only a few constraints for positions and velocities. Y1 - 2015 U6 - https://doi.org/10.1145/2786784.2786799 SP - 101 EP - 109 ER - TY - GEN A1 - Reininghaus, Jan A1 - Günther, David A1 - Hotz, Ingrid A1 - Weinkauf, Tino A1 - Seidel, Hans Peter T1 - Combinatorial Gradient Fields for 2D Images with Empirically Convergent Separatrices Y1 - 2012 UR - http://arxiv.org/abs/1208.6523 ER - TY - JOUR A1 - Schulz, Christian A1 - Tycowicz, Christoph von A1 - Seidel, Hans-Peter A1 - Hildebrandt, Klaus T1 - Animating Deformable Objects Using Sparse Spacetime Constraints JF - ACM Transactions on Graphics N2 - We propose a scheme for animating deformable objects based on spacetime optimization. The main feature is that it robustly and quickly (within a few seconds) generates interesting motion from a sparse set of spacetime constraints. Providing only partial (as opposed to full) keyframes for positions and velocities is sufficient. The computed motion satisfies the constraints and the remaining degrees of freedom are determined by physical principles using elasticity and the spacetime constraints paradigm. Our modeling of the spacetime optimization problem combines dimensional reduction, modal coordinates, wiggly splines, and rotation strain warping. Controlling the warped motion requires the derivative of the warp map. We derive a representation of the derivative that can be efficiently and robustly evaluated. Our solver is based on a theorem that characterizes the solutions of the optimization problem and allows us to restrict the optimization to very low-dimensional search spaces. This treatment of the optimization problem avoids a time discretization and the resulting method can robustly deal with sparse input and wiggly motion. Y1 - 2014 U6 - https://doi.org/10.1145/2601097.2601156 VL - 33 IS - 4 SP - 109:1 EP - 109:10 ER - TY - JOUR A1 - Tycowicz, Christoph von A1 - Schulz, Christian A1 - Seidel, Hans-Peter A1 - Hildebrandt, Klaus T1 - An Efficient Construction of Reduced Deformable Objects JF - ACM Transactions on Graphics N2 - Many efficient computational methods for physical simulation are based on model reduction. We propose new model reduction techniques for the approximation of reduced forces and for the construction of reduced shape spaces of deformable objects that accelerate the construction of a reduced dynamical system, increase the accuracy of the approximation, and simplify the implementation of model reduction. Based on the techniques, we introduce schemes for real-time simulation of deformable objects and interactive deformation-based editing of triangle or tet meshes. We demonstrate the effectiveness of the new techniques in different experiments with elastic solids and shells and compare them to alternative approaches. Y1 - 2013 U6 - https://doi.org/10.1145/2508363.2508392 VL - 32 IS - 6 SP - 213:1 EP - 213:10 PB - ACM ER -