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Displaying 1-49 out of 49 total
ManyVis: Multiple Applications in an Integrated Visualization Environment
Found in: IEEE Transactions on Visualization and Computer Graphics
By Atul Rungta,Brian Summa,Dogan Demir,Peer-Timo Bremer,Valerio Pascucci
Issue Date:December 2013
pp. 2878-2885
As the visualization field matures, an increasing number of general toolkits are developed to cover a broad range of applications. However, no general tool can incorporate the latest capabilities for all possible applications, nor can the user interfaces a...
 
Progressive Volume Rendering of Large Unstructured Grids
Found in: IEEE Transactions on Visualization and Computer Graphics
By Steven P. Callahan,Louis Bavoil,Valerio Pascucci,Claudio T. Silva
Issue Date:September 2006
pp. 1307-1314
We describe a new progressive technique that allows real-time rendering of extremely large tetrahedral meshes. Our approach uses a client-server architecture to incrementally stream portions of the mesh from a server to a client which refines the quality o...
 
The Natural Helmholtz-Hodge Decomposition for Open-Boundary Flow Analysis
Found in: IEEE Transactions on Visualization and Computer Graphics
By Harsh Bhatia,Valerio Pascucci,Peer-Timo Bremer
Issue Date:November 2014
pp. 1566-1578
The Helmholtz-Hodge decomposition (HHD), which describes a flow as the sum of an incompressible, an irrotational, and a harmonic flow, is a fundamental tool for simulation and analysis. Unfortunately, for bounded domains, the HHD is not uniquely defined, t...
 
Abstract: Exploring Performance Data with Boxfish
Found in: 2012 SC Companion: High Performance Computing, Networking, Storage and Analysis (SCC)
By Katherine E. Isaacs,Aaditya G. Landge,Todd Gamblin,Peer-Timo Bremer,Valerio Pascucci,Bernd Hamann
Issue Date:November 2012
pp. 1380-1381
The growth in size and complexity of scaling applications and the systems on which they run pose challenges in analyzing and improving their overall performance. With metrics coming from thousands or millions of processes, visualization techniques are nece...
 
Efficient data restructuring and aggregation for I/O acceleration in PIDX
Found in: 2012 SC - International Conference for High Performance Computing, Networking, Storage and Analysis
By Sidharth Kumar,Venkatram Vishwanath,Philip Carns,Joshua A. Levine,Robert Latham,Giorgio Scorzelli,Hemanth Kolla,Ray Grout,Robert Ross,Michael E. Papka,Jacqueline Chen,Valerio Pascucci
Issue Date:November 2012
pp. 1-11
Hierarchical, multiresolution data representations enable interactive analysis and visualization of large-scale simulations. One promising application of these techniques is to store high performance computing simulation output in a hierarchical Z (HZ) ord...
 
Combining in-situ and in-transit processing to enable extreme-scale scientific analysis
Found in: 2012 SC - International Conference for High Performance Computing, Networking, Storage and Analysis
By Janine C. Bennett,Hasan Abbasi,Peer-Timo Bremer,Ray Grout,Attila Gyulassy,Tong Jin,Scott Klasky,Hemanth Kolla,Manish Parashar,Valerio Pascucci,Philippe Pebay,David Thompson,Hongfeng Yu,Fan Zhang,Jacqueline Chen
Issue Date:November 2012
pp. 1-9
With the onset of extreme-scale computing, I/O constraints make it increasingly difficult for scientists to save a sufficient amount of raw simulation data to persistent storage. One potential solution is to change the data analysis pipeline from a post-pr...
 
Interactive Quadrangulation with Reeb Atlases and Connectivity Textures
Found in: IEEE Transactions on Visualization and Computer Graphics
By Julien Tierny,Joel Daniels II,Luis Gustavo Nonato,Valerio Pascucci,Cláudio T. Silva
Issue Date:October 2012
pp. 1650-1663
Creating high-quality quad meshes from triangulated surfaces is a highly nontrivial task that necessitates consideration of various application specific metrics of quality. In our work, we follow the premise that automatic reconstruction techniques may not...
 
Extreme-Scale Visual Analytics
Found in: IEEE Computer Graphics and Applications
By Pak Chung Wong,Han-Wei Shen,Valerio Pascucci
Issue Date:July 2012
pp. 23-25
Extreme-scale visual analytics (VA) is about applying VA to extreme-scale data. The articles in this special issue examine advances related to extreme-scale VA problems, their analytical and computational challenges, and their real-world applications.
 
Feature-Based Statistical Analysis of Combustion Simulation Data
Found in: IEEE Transactions on Visualization and Computer Graphics
By Janine C. Bennett,Vaidyanathan Krishnamoorthy, Shusen Liu,Ray W. Grout,Evatt R. Hawkes,Jacqueline H. Chen,Jason Shepherd,Valerio Pascucci,Peer-Timo Bremer
Issue Date:December 2011
pp. 1822-1831
We present a new framework for feature-based statistical analysis of large-scale scientific data and demonstrate its effectiveness by analyzing features from Direct Numerical Simulations (DNS) of turbulent combustion. Turbulent flows are ubiquitous and acc...
 
Genus Oblivious Cross Parameterization: Robust Topological Management of Inter-Surface Maps
Found in: Computer Graphics and Applications, Pacific Conference on
By Janine Bennett, Valerio Pascucci, Kenneth Joy
Issue Date:November 2007
pp. 238-247
<p>We consider the problem of generating a map between two triangulated meshes, M and M?, with arbitrary and possibly differing genus. This problem has rarely been tackled in its generality. Early schemes considered only topological spheres. Recent a...
 
A Topological Approach to Simplification of Three-Dimensional Scalar Functions
Found in: IEEE Transactions on Visualization and Computer Graphics
By Attila Gyulassy, Vijay Natarajan, Valerio Pascucci, Peer-Timo Bremer, Bernd Hamann
Issue Date:July 2006
pp. 474-484
<p><b>Abstract</b>—This paper describes an efficient combinatorial method for simplification of topological features in a 3D scalar function. The Morse-Smale complex, which provides a succinct representation of a function's associated gra...
 
Topology-based Simplification for Feature Extraction from 3D Scalar Fields
Found in: Visualization Conference, IEEE
By Attila Gyulassy, Vijay Natarajan, Valerio Pascucci, Peer-Timo Bremer, Bernd Hamann
Issue Date:October 2005
pp. 68
In this paper, we present a topological approach for simplifying continuous functions defined on volumetric domains. We introduce two atomic operations that remove pairs of critical points of the function and design a combinatorial algorithm that simplifie...
 
Local and Global Comparison of Continuous Functions
Found in: Visualization Conference, IEEE
By Herbert Edelsbrunner, John Harer, Vijay Natarajan, Valerio Pascucci
Issue Date:October 2004
pp. 275-280
We introduce local and global comparison measures for a collection of k ≤ d real-valued smooth functions on a common d-dimensional Riemannian manifold. For k = d = 2 we relate the measures to the set of critical points of one function restricted to the lev...
 
Encoding Volumetric Grids For Streaming Isosurface Extraction
Found in: 3D Data Processing Visualization and Transmission, International Symposium on
By Ajith Mascarenhas, Martin Isenburg, Valerio Pascucci, Jack Snoeyink
Issue Date:September 2004
pp. 665-672
Gridded volumetric data sets representing simulation or tomography output are commonly visualized by displaying a triangulated isosurface for a particular isovalue. When the grid is stored in a standard format, the entire volume must be loaded from disk, e...
 
Progressive Compression of Volumetric Subdivision Meshes
Found in: 3D Data Processing Visualization and Transmission, International Symposium on
By Daniel Laney, Valerio Pascucci
Issue Date:September 2004
pp. 680-687
We present a progressive compression technique for volumetric subdivision meshes based on the slow growing refinement algorithm. The system is comprised of a wavelet transform followed by a progressive encoding of the resulting wavelet coefficients.<div...
 
A Multi-Layered Image Cache for Scientific Visualization
Found in: Parallel and Large-Data Visualization and Graphics, IEEE Symposium on
By Eric LaMar, Valerio Pascucci
Issue Date:October 2003
pp. 9
We introduce a multi-layered image cache system that is designed to work with a pool of rendering engines to facilitate a frame-less, asynchronous rendering environment for scientific visualization. Our system decouples the rendering from the display of im...
 
Hierarchical Representation of Time-Varying Volume Data with
Found in: Computer Graphics and Applications, Pacific Conference on
By Lars Linsen, Valerio Pascucci, Mark A. Duchaineau, Bernd Hamann, Kenneth I. Joy
Issue Date:October 2002
pp. 346
<p>Multiresolution methods for representing data at multiple levels of detail are widely used for large-scale two- and three-dimensional data sets. We present a four-dimensional multiresolution approach for time-varying volume data. This approach sup...
 
Interactive View-Dependent Rendering of Large IsoSurfaces
Found in: Visualization Conference, IEEE
By Benjamin Gregorski, Mark Duchaineau, Peter Lindstrom, Valerio Pascucci, Kenneth I. Joy
Issue Date:November 2002
pp. N/A
We present an algorithm for interactively extracting and rendering isosurfaces of large volume datasets in a view-dependent fashion. A recursive tetrahedral mesh refinement scheme, based on longest edge bisection, is used to hierarchically decompose the da...
 
Visualization of Large Terrains Made Easy
Found in: Visualization Conference, IEEE
By Peter Lindstrom, Valerio Pascucci
Issue Date:October 2001
pp. N/A
We present an elegant and simple to implement framework for performing out-of-core visualization and view-dependent refinement of large terrain surfaces. Contrary to the recent trend of increasingly elaborate algorithms for large-scale terrain visualizatio...
 
Multi-Resolution Dynamic Meshes with Arbitrary Deformation
Found in: Visualization Conference, IEEE
By Ariel Shamir, Valerio Pascucci, Chandrajit Bajaj
Issue Date:October 2000
pp. 73
Multi-resolution techniques and models have been shown to be effective for the display and transmission of large static geometric object. Dynamic environments with internally deforming models and scientific simulations using dynamic meshes pose greater cha...
 
Progressive Compression and Transmission of Arbitrary Triangular Meshes
Found in: Visualization Conference, IEEE
By Chandrajit L. Bajaj, Valerio Pascucci, Guozhong Zhuang
Issue Date:October 1999
pp. 54
<div>The recent growth in the size and availability of large triangular surface models has generated interest in compact multi-resolution progressive representation and data transmission. An ongoing challenge is to design an efficient data structure ...
 
Distributed Seams for Gigapixel Panoramas
Found in: IEEE Transactions on Visualization and Computer Graphics
By Sujin Philip,Brian Summa,Julien Tierny,Peer-Timo Bremer,Valerio Pascucci
Issue Date:February 2015
pp. 1
Gigapixel panoramas are an increasingly popular digital image application. They are often created as a mosaic of many smaller images. The mosaic acquisition can take many hours causing the individual images to differ in exposure and lighting conditions. A ...
 
ManyVis: Multiple Applications in an Integrated Visualization Environment
Found in: IEEE Transactions on Visualization and Computer Graphics
By Atul Rungta,Brian Summa,Dogan Demir,Peer-Timo Bremer,Valerio Pascucci
Issue Date:December 2013
pp. 2878-2885
As the visualization field matures, an increasing number of general toolkits are developed to cover a broad range of applications. However, no general tool can incorporate the latest capabilities for all possible applications, nor can the user interfaces a...
 
A Flexible Framework for Fusing Image Collections into Panoramas
Found in: 2013 XXVI SIBGRAPI - Conference on Graphics, Patterns and Images (SIBGRAPI)
By Wathsala Widanagamaachchi,Paul Rosen,Valerio Pascucci
Issue Date:August 2013
pp. 195-202
Panoramas create summary views of multiple images, which make them a valuable means of analyzing huge quantities of image and video data. This paper introduces the Ray Graph - a general framework for panorama construction. With rays as its vertices, the Ra...
 
Mapping applications with collectives over sub-communicators on torus networks
Found in: 2012 SC - International Conference for High Performance Computing, Networking, Storage and Analysis
By Abhinav Bhatele,Todd Gamblin,Steven H. Langer,Peer-Timo Bremer,Erik W. Draeger,Bernd Hamann,Katherine E. Isaacs,Aaditya G. Landge,Joshua A. Levine,Valerio Pascucci,Martin Schulz,Charles H. Still
Issue Date:November 2012
pp. 1-11
The placement of tasks in a parallel application on specific nodes of a supercomputer can significantly impact performance. Traditionally, this task mapping has focused on reducing the distance between communicating tasks on the physical network. This mini...
 
Edge maps: Representing flow with bounded error
Found in: 2011 IEEE Pacific Visualization Symposium (PacificVis)
By Harsh Bhatia,Shreeraj Jadhav,Peer-Timo Bremer, Guoning Chen,Joshua A Levine,Luis Gustavo Nonato,Valerio Pascucci
Issue Date:March 2011
pp. 75-82
Robust analysis of vector fields has been established as an important tool for deriving insights from the complex systems these fields model. Many analysis techniques rely on computing streamlines, a task often hampered by numerical instabilities. Approach...
 
Single Resolution Compression of Arbitrary Triangular Meshes with Properties
Found in: Data Compression Conference
By Chandrajit L Bajaj, Valerio Pascucci, Guozhong Zhuang
Issue Date:March 1999
pp. 247
Polygonal meshes have been used as the primary geometric model representation for net- worked gaming and for complex interactive design in manufacturing. Accurate polygonal mesh approximation of a surface with sharp features (holes, highly varying curvatur...
 
Fast Isocontouring for Improved Interactivity
Found in: Volume Visualization and Graphics, IEEE Symposium on
By Chandrajit L. Bajaj, Valerio Pascucci, Daniel R. Schikore
Issue Date:October 1996
pp. 39
We present an isocontouring algorithm which is near-optimal for real-time interaction and modification of isovalues in large datasets. A preprocessing step selects a subset S of the cells which are considered as seed cells. Given a particular isovalue, all...
 
Exploring power behaviors and trade-offs of in-situ data analytics
Found in: Proceedings of SC13: International Conference for High Performance Computing, Networking, Storage and Analysis (SC '13)
By Aaditya G. Landge, Attila Gyulassy, Hemanth Kolla, Jacqueline Chen, Marc Gamell, Patrick McCormick, Peer-Timo Bremer, Scott Klasky, Valerio Pascucci, Ivan Rodero, Janine C. Bennett, Manish Parashar, Scott Pakin
Issue Date:November 2013
pp. 1-12
As scientific applications target exascale, challenges related to data and energy are becoming dominating concerns. For example, coupled simulation workflows are increasingly adopting in-situ data processing and analysis techniques to address costs and ove...
     
Characterization and modeling of PIDX parallel I/O for performance optimization
Found in: Proceedings of SC13: International Conference for High Performance Computing, Networking, Storage and Analysis (SC '13)
By Giorgio Scorzelli, Hemanth Kolla, Michael E. Papkafa, Philip Carns, Sidharth Kumar, Venkatram Vishwanath, Avishek Saha, Jacqueline Chen, John A. Schmidt, Ray Grout, Robert Latham, Robert Ross, Valerio Pascucci
Issue Date:November 2013
pp. 1-12
Parallel I/O library performance can vary greatly in response to user-tunable parameter values such as aggregator count, file count, and aggregation strategy. Unfortunately, manual selection of these values is time consuming and dependent on characteristic...
     
Topology exploration with hierarchical landscapes
Found in: Proceedings of the Workshop at SIGGRAPH Asia (WASA '12)
By Bernd Hamann, Dogan Demir, Gunther H. Weber, Kenes Beketayev, Peer-Timo Bremer, Valerio Pascucci
Issue Date:November 2012
pp. 147-154
Topological landscapes have been proposed as a visual metaphor for contour trees that does not require an understanding of the theory involved in defining contour trees. The idea is to create a representative terrain with the same topological structure as ...
     
Panorama weaving: fast and flexible seam processing
Found in: ACM Transactions on Graphics (TOG)
By Brian Summa, Julien Tierny, Valerio Pascucci
Issue Date:July 2012
pp. 1-11
A fundamental step in stitching several pictures to form a larger mosaic is the computation of boundary seams that minimize the visual artifacts in the transition between images. Current seam computation algorithms use optimization methods that may be slow...
     
Visualization of discrete gradient construction
Found in: Proceedings of the 27th annual ACM symposium on Computational geometry (SoCG '11)
By Attila Gyulassy, Joshua Aaron Levine, Valerio Pascucci
Issue Date:June 2011
pp. 289-290
This video presents a visualization of a recent algorithm to compute discrete gradient fields on regular cell complexes. Discrete gradient fields are used in practical methods that robustly translate smooth Morse theory to combinatorial domains. We describ...
     
Interactive editing of massive imagery made simple: Turning Atlanta into Atlantis
Found in: ACM Transactions on Graphics (TOG)
By Brian Summa, Giorgio Scorzelli, Ming Jiang, Peer-Timo Bremer, Valerio Pascucci
Issue Date:April 2011
pp. 1-13
This article presents a simple framework for progressive processing of high-resolution images with minimal resources. We demonstrate this framework's effectiveness by implementing an adaptive, multi-resolution solver for gradient-based image processing tha...
     
Interactive editing of massive imagery made simple: Turning atlanta into atlantis
Found in: ACM Transactions on Graphics (TOG)
By Brian Summa, Giorgio Scorzelli, Ming Jiang, Peer-Timo Bremer, Valerio Pascucci
Issue Date:October 2010
pp. 1-13
This article presents a simple framework for progressive processing of high-resolution images with minimal resources. We demonstrate this framework's effectiveness by implementing an adaptive, multi-resolution solver for gradient-based image processing tha...
     
Lessons learned from moving earth system grid data sets over a 20 Gbps wide-area network
Found in: Proceedings of the 19th ACM International Symposium on High Performance Distributed Computing (HPDC '10)
By Alex Sim, Andrew Cherry, Bill Allcock, Dan Gunter, David Ressman, Dean Williams, Eli Dart, Ian Foster, Jason Hick, Jason Lee, Jeff Long, John Bresnahan, Keith Miller, Ken Raffenetti, Kevin Harms, Linda Winkler, Lisa Childers, Loren Wilson, Michael Link, Peer-Timo Bremer, Raj Kettimuthu, Valerio Pascucci, Vijaya Natarajan
Issue Date:June 2010
pp. 316-319
In preparation for the Intergovernmental Panel on Climate Change (IPCC) Fifth Assessment Report, the climate community will run the Coupled Model Intercomparison Project phase 5 (CMIP-5) experiments, which are designed to answer crucial questions about fut...
     
Robust on-line computation of Reeb graphs: simplicity and speed
Found in: ACM Transactions on Graphics (TOG)
By Ajith Mascarenhas, Giorgio Scorzelli, Peer-Timo Bremer, Valerio Pascucci
Issue Date:July 2007
pp. 1-35
Reeb graphs are a fundamental data structure for understanding and representing the topology of shapes. They are used in computer graphics, solid modeling, and visualization for applications ranging from the computation of similarities and finding defects ...
     
Spectral surface quadrangulation: Copyright restrictions prevent ACM from providing the full text for this work.
Found in: ACM SIGGRAPH 2006 Papers (SIGGRAPH '06)
By John C. Hart, Michael Garland, Peer-Timo Bremer, Shen Dong, Valerio Pascucci
Issue Date:July 2006
pp. 66-es
Resampling raw surface meshes is one of the most fundamental operations used by nearly all digital geometry processing systems. The vast majority of this work has focused on triangular remeshing, yet quadrilateral meshes are preferred for many surface PDE ...
     
Spectral surface quadrangulation: Copyright restrictions prevent ACM from providing the full text for this work.
Found in: Material presented at the ACM SIGGRAPH 2006 conference (SIGGRAPH '06)
By John C. Hart, Michael Garland, Peer-Timo Bremer, Shen Dong, Valerio Pascucci
Issue Date:July 2006
pp. 66-es
Resampling raw surface meshes is one of the most fundamental operations used by nearly all digital geometry processing systems. The vast majority of this work has focused on triangular remeshing, yet quadrilateral meshes are preferred for many surface PDE ...
     
Persistence-sensitive simplification functions on 2-manifolds
Found in: Proceedings of the twenty-second annual symposium on Computational geometry (SCG '06)
By Dmitriy Morozov, Herbert Edelsbrunner, Valerio Pascucci
Issue Date:June 2006
pp. 127-134
We continue the study of topological persistence [5] by investigating the problem of simplifying a function f in a way that removes topological noise as determined by its persistence diagram [2]. To state our results, we call a function g an ε-simplif...
     
Morse-smale complexes for piecewise linear 3-manifolds
Found in: Proceedings of the nineteenth conference on Computational geometry (SCG '03)
By Herbert Edelsbrunner, John Harer, Valerio Pascucci, Vijay Natarajan
Issue Date:June 2003
pp. 361-370
We define the Morse-Smale complex of a Morse function over a 3-manifold as the overlay of the descending and ascending manifolds of all critical points. In the generic case, its 3-dimensional cells are shaped like crystals and are separated by quadrangular...
     
Loops in reeb graphs of 2-manifolds
Found in: Proceedings of the nineteenth conference on Computational geometry (SCG '03)
By Herbert Edelsbrunner, John Harer, Kree Cole-McLaughlin, Valerio Pascucci, Vijay Natarajan
Issue Date:June 2003
pp. 344-350
Given a Morse function f over a 2-manifold with or without boundary, the Reeb graph is obtained by contracting the connected components of the level sets to points. We prove tight upper and lower bounds on the number of loops in the Reeb graph that depend ...
     
Slow growing volumetric subdivision
Found in: ACM SIGGRAPH 2002 conference abstracts and applications (SIGGRAPH '02)
By Valerio Pascucci
Issue Date:July 2002
pp. 251-251
In recent years subdivision methods have been successfully applied to the multi-resolution representation and compression of surface meshes. Unfortunately their use in the volumetric case has remained impractical because of the use of tensor-product genera...
     
Global static indexing for real-time exploration of very large regular grids
Found in: Proceedings of the 2001 ACM/IEEE conference on Supercomputing (CDROM) (Supercomputing '01)
By Randall J. Frank, Valerio Pascucci
Issue Date:November 2001
pp. 2-2
In this paper we introduce a new indexing scheme for progressive traversal and visualization of large regular grids. We demonstrate the potential of our approach by providing a tool that displays at interactive rates planar slices of scalar field data with...
     
Temporal and spatial level of details for dynamic meshes
Found in: Proceedings of the ACM symposium on Virtual reality software and technology (VRST '01)
By Ariel Shamir, Valerio Pascucci
Issue Date:November 2001
pp. 77-84
Multi-resolution techniques enhance the ability of graphics and visual systems to overcome limitations in time, space and transmission costs. Numerous techniques have been presented which concentrate on creating level of detail models for static meshes. Ti...
     
The contour spectrum
Found in: ACM SIGGRAPH 97 Visual Proceedings: The art and interdisciplinary programs of SIGGRAPH '97 (SIGGRAPH '97)
By Chandrajit L. Bajaj, Daniel R. Schikore, Valerio Pascucci
Issue Date:August 1997
pp. 192
This paper describes a physically-based rendering system tailored to the demands of lighting design and architecture. The simulation uses a light-backwards ray-tracing method with extensions to efficiently solve the rendering equation under most conditions...
     
Splitting a complex of convex polytopes in any dimension
Found in: Proceedings of the twelfth annual symposium on Computational geometry (SCG '96)
By Chandrajit L. Bajaj, Valerio Pascucci
Issue Date:May 1996
pp. 88-97
An interactive visualization of weighted three-dimensional α-hulls is presented for static and dynamic spheres. The α-hull is analytically computed and represented by a triangulated mesh. The entire surface is computed and displayed in real-time ...
     
Dimension-independent convex-cell based HPC: representation scheme and implementation issues
Found in: Proceedings of the third ACM symposium on Solid modeling and applications (SMA '95)
By Alberto Paoluzzi, Valerio Pascucci, Vincenzo Ferrucci
Issue Date:May 1995
pp. 163-174
The problem of interconnect architecture arises when an array of processors needs to be integrated on one chip. With the deep sub-micron technology, devices become cheap while wires are expensive. On the other hand, high performance systems require the sho...
     
Geometric programming: a programming approach to geometric design
Found in: ACM Transactions on Graphics (TOG)
By Alberto Paoluzzi, Michele Vicentino, Valerio Pascucci
Issue Date:January 1991
pp. 266-306
This article presents a functional programming approach to geometric design with embedded polyhedral complexes. Its main goals are to show the expressive power of the language as well as its usefulness for geometric design. The language, named PLASM (the P...
     
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