SciDAC Visualization and Analytics Center for Enabling Technologies (2008)
Bethel, E. Wes, Johnson, Chris, Joy, Ken, Ahern, Sean, Pascucci, Valerio, Childs, Hank, ...
The Visualization and Analytics Center for Enabling Technologies (VACET) focuses on leveraging scientific visualization and analytics software technology as an enabling technology for increasing...
Bethel, E. Wes, Johnson, Chris, Aragon, Cecilia, Prabhat, ???, Rubel, Oliver, Weber, Gunther, ...
The focus of this article is on how one group of researchers the DOE SciDAC Visualization and Analytics Center for Enabling Technologies (VACET) is tackling the daunting task of enabling knowledge...
VACET: Proposed SciDAC2 Visualization and Analytics Center for Enabling Technologies (2008)
Bethel, W., Johnson, Chris, Hansen, Charles, Parker, Steve, Sanderson, Allen, Silva, Claudio, ...
This paper accompanies a poster that is being presented at the SciDAC 2006 meeting in Denver, CO. This project focuses on leveraging scientific visualization and analytics software technology as an...
Topology-controlled volume rendering (2007)
Weber, Gunther H, Dillard, Scott E, Carr, Hamish, Pascucci, Valerio, Hamann, Bernd
Topology provides a foundation for the development of mathematically sound tools for processing and exploration of scalar fields. Existing topology-based methods can be used to identify interesting...
SciDAC Visualization and Analytics Center for Enabling Technology (2006)
Bethel, E. Wes, Johnson, Chris, Joy, Ken, Ahern, Sean, Pascucci, Valerio, Childs, Hank, ...
The SciDAC2 Visualization and Analytics Center for Enabling Technologies (VACET) began operation on 10/1/2006. This document, dated 11/27/2006, is the first version of the VACET project management...
Encoding Volumetric Grids For Streaming Isosurface Extraction (2004)
Ajith Mascarenhas, Martin Isenburg, Valerio Pascucci, Jack Snoeyink
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...
Time-varying Reeb Graphs for Continuous Space-Time Data (2004)
Herbert Edelsbrunner, John Harer, Ajith Mascarenhas, Valerio Pascucci
We study the evolution of the Reeb graph of a time-varying continuous function defined in three-dimensional space. While maintaining the Reeb graph, we compress the evolving sequence into a single,...
Loops in Reeb Graphs of 2-Manifolds (2004)
Kree Cole-mclaughlin, Herbert Edelsbrunner, John Harer, Vijay Natarajan, Valerio Pascucci
Given a Morse function 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...
Prototype Shape Modeling with a Design Language (2004)
Alberto Paoluzzi, Valerio Pascucci, Claudio Sansoni
A programming approach to the rapid prototyping of architectural design is discussed in this paper. This is done with particular reference to the early steps of design development, where a number of...
LETTER Special Issue on Machine Vision Applications (2004)
Concettina Guerra, Valerio Pascucci, Summary Thepropel
this paper we consider a direct 3D line detection problem stated asf#[B) ws. Given a set # n points in 3D space and a non-negative constant #, determine the line that is at a distance at most #f#(A...
A Multi-Layered Image Cache for Scientific Visualization (2004)
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....
Hierarchical Indexing for (2004)
Valerio Pascucci, All J. Frank
This paper introduces a new global indexing scheme that accelerates adaptive traversal of geometric data represented with binary trees by improving the locality of hierarchical/spatial data access....
Temporal and Spatial Level of Details for Dynamic Meshes (2003)
Ariel Shamir, Valerio Pascucci
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...
Single Resolution Compression of Arbitrary Triangular Meshes with Properties (2003)
Chandrajit L Bajaj, Valerio Pascucci, Guozhong Zhuang
Polygonal meshes have been used as the primary geometric... In this paper, we propose a new layering structure to partition an arbitrary triangular mesh (no-manifold and arbitrary-genus) into...
Dynamic Maintenance and Visualization of Molecular Surfaces (2003)
Chandrajit L. Bajaj, Valerio Pascucci, Robert J. Holt, Arun N. Netravali
A method of modeling and animating objects that has gained much popularity recently is the use of molecular surfaces. A great deal of past work has included the combination of efficient data...
Progressive Compression and Transmission of Arbitrary Triangular Meshes (2003)
Chandrajit L Bajaj, Valerio Pascucci, Guozhong Zhuang
The recent growth in the size and availability of large triangular surface models has generated research in compact multi-resolution progressive representation and data transmission. An ongoing...
Multi-Resolution Dynamic Meshes with Arbitrary Deformations (2003)
Ariel Shamir, Valerio Pascucci, Chandrajit Bajaj
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 objects pose...
Temporal and Spatial Level of Details for Dynamic Meshes (2003)
Ariel Shamir, Valerio Pascucci
Multi-resolution techniques enhance the abilities of visualization systems to overcome limitations in time, space and transmission costs. Numerous techniques have been presented which concentrate on...
Chandrajit L. Bajaj, Valerio Pascucci, Daniel R. Schikore
Weintroduce the contour spectrum, a user interface component that improves qualitativeuserinteraction and provides real-time exact quantification in the visualization of isocontours. The contour...
Splitting a Complex of Convex Polytopes In Any Dimension (2003)
Chandrajit L. Bajaj, Valerio Pascucci
Introduction We present a locality-based algorithm to solve the problem of splitting a complex of convex polytopes with a hyperplane or a convex subset of it. The solution to this problem has several...
Dynamic Maintenance and Visualization of Molecular Surfaces (2003)
Chandrajit L. Bajaj, Valerio Pascucci, Ariel Shamir, Robert J. Holt, Arun N. Netravali
Molecular surface computations are often necessary in order to perform synthetic drug design. A critical step in this process is the computation and update of an exact boundary representation for the...
Morse-Smale Complexes for Piecewise Linear 3-Manifolds (2003)
Herbert Edelsbrunner, John Harer, Vijay Natarajan, Valerio Pascucci
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...
Dynamic Maintenance and Visualization of Molecular Surfaces (2002)
Chandrajit L. Bajaj, Valerio Pascucci, Ariel Shamir, Robert J. Holt, Arun N. Netravali
Molecular surface computations are often necessary in order to perform synthetic drug design. A critical step in this process is the computation and update of an exact boundary representation for the...
Benjamin Gregorski, Mark Duchaineau, Peter Lindstrom, Valerio Pascucci, Kenneth I. Joy
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...
Multi-resolution Indexing for Hierarchical Out-of-core Traversal of Rectilinear Grids (2002)
this paper I introduce a new static indexing scheme that induces a data layout satisfying both requirements (i) and (ii) for the hierarchical traversal of n-dimensional regular grids. In one...
Multi-Resolution Dynamic Meshes with Arbitrary Deformations (2001)
Ariel Shamir, Valerio Pascucci, Chandrajit Bajaj
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 objects pose...
Contour Trees and Small Seed Sets for Isosurface Traversal (2001)
Chandrajit Bajaj, Valerio Pascucci, Dan Schikore
For 2D or 3D meshes that represent a continuous function to the reals, the contours---or isosurfaces---of a specified value are an important way to visualize it. To find such contours, a seed set can...
Dynamic Maintenance and Visualization of Molecular Surfaces (2001)
Chandrajit L. Bajaj, Valerio Pascucci, Robert J. Holt, Arun N. Netravali
Molecular surface computations are basic molecular modeling operations that are necessary to deal with in order to perform synthetic drug design. Computing and updating exact boundary representations...
Fast Isocontouring For Improved Interactivity (2001)
Chandrajit L. Bajaj, Valerio Pascucci, Daniel R. Schikore
We present an isocontouringalgorithm 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...
Compression and Coding of Large CAD Models (2001)
Chandrajit L Bajaj, Valerio Pascucci, Guozhong Zhuang
In this paper we introduce a compression scheme suitable for large CAD (Computer Aided Design) models. We assume as input a large model in IGES 1 and VRML 2 formats that encode efficiently and...
Dynamic Maintenance and Visualization of Molecular Surfaces (2000)
Chandrajit L. Bajaj, Valerio Pascucci, Robert J. Holt, Arun N. Netravali
A method of modeling and animating objects that has gained much popularity recently is the use of molecular surfaces. A great deal of past work has included the combination of efficient data...
Multi-Resolution Dynamic Meshes with Arbitrary Deformations (2000)
Ariel Shamir, Valerio Pascucci, Chandrajit Bajaj
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 objects pose...
Multi-dimensional and multi-resolution geometric data-structures for scientific visualization (2000)
This dissertation investigates multi-resolution and multi-dimensional geometric techniques oriented to the visualization of scientific data. The main focus is on the display of scalar fields...
Single Resolution Compression of Arbitrary Triangular Meshes with Properties (1999)
Chandrajit L Bajaj, Valerio Pascucci, Guozhong Zhuang
Triangular meshes are widely used as primary representation of surface models for networked gaming and for complex interactive design in manufacturing. Accurate traingulation of a surface with sharp...
Single Resolution Compression of Arbitrary Triangular Meshes with Properties (1999)
Chandrajit L Bajaj, Valerio Pascucci, Guozhong Zhuang
this paper, we propose a new layering structure to partition an arbitrary triangular mesh (non-manifold, arbitrary-genus amd possibly vertex irregularities) into generalized triangle strips. An...
Single Resolution Compression of Arbitrary Triangular Meshes with Properties (1999)
Chandrajit L Bajaj, Valerio Pascucci, Guozhong Zhuang
this paper, we propose a new layering structure to partition an arbitrary triangular mesh (no-manifold and arbitrary-genus) into generalized triangle strips. An efficient and flexible encoding of the...
Active Contouring of Images with Physical A-splines (1999)
Chandrajit L. Bajaj, Valerio Pascucci, Robert J. Holt, Arun N. Netravali
A-splines are implicit real algebraic curves in Bernstein-B'ezier (BB) form that are smooth. We use these in an algorithm for active contouring of images. One advantage of A-splines is that any...
Chandrajit L. Bajaj, Valerio Pascucci, Daniel R. Schikore
We introduce the contour spectrum, a user interface component that improves qualitative user interaction and provides real-time exact quantification in the visualization of isocontours. The contour...
Contour Trees and Small Seed Sets for Isosurface Traversal (1999)
Ren'e Van Oostrum, Van Kreveld, Chandrajit Bajaj, Valerio Pascucci, Dan Schikore
For 2D or 3D meshes that represent a continuous function to the reals, the contours---or isosurfaces---of a specified value are an important way to visualize it. To find such contours, a seed set can...
Fast Isocontouring For Improved Interactivity (1999)
Chandrajit L. Bajaj, Valerio Pascucci, Daniel R. Schikore
We present an isocontouringalgorithm 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...
Contour Trees and Small Seed Sets for Isosurface Traversal (1999)
Marc Van Kreveld, Renevan Oostrum, Chandrajit Bajaj, Valerio Pascucci, Dan Schikore
For 2D or 3D meshes that represent a continuous function to the reals, the contours -- or isosurfaces -- of a specified value are an importantway to visualize it. To find such contours, a seed set...
Single Resolution Compression of Arbitrary Triangular Meshes with Properties (1999)
Chandrajit L Bajaj, Valerio Pascucci, Guozhong Zhuang
this paper, we propose a new layering structure to partition an arbitrary triangular mesh (no-manifold and arbitrary-genus) into generalized triangle strips. An efficient and flexible encoding of the...
Single Resolution Compression of Arbitrary Triangular Meshes with Properties (1999)
Chandrajit L Bajaj, Valerio Pascucci, Guozhong Zhuang
this paper, we propose a new layering structure to partition an arbitrary triangular mesh (no-manifold and arbitrary-genus) into generalized triangle strips. An efficient and flexible encoding of the...
Active Contouring of Images with Physical A-splines (1998)
Chandrajit L. Bajaj, Valerio Pascucci, Robert J. Holt, Arun N. Netravali
A-splines are implicit real algebraic curves in Bernstein-B'ezier (BB) form that are smooth. We use these in an algorithm for active contouring of images. One advantage of A-splines is that any...
Compression and Coding of Large CAD Models (1998)
Chandrajit L Bajaj, Valerio Pascucci, Guozhong Zhuang
We introduce a compression scheme suitable for large CAD (Computer Aided Design) models. We take as input IGES 1 or VRML 2 models efficiently encode and transmit to clients for remote interactive...
Compression and Coding of Large CAD Models (1998)
Chandrajit L Bajaj, Valerio Pascucci, Guozhong Zhuang
In this paper we introduce a compression scheme suitable for large CAD (Computer Aided Design) models. We assume as input a large model in IGES 1 and VRML 2 formats that encode efficiently and...
Contour Trees and Small Seed Sets for Isosurface Traversal (1998)
Ren'e Van Oostrum, Chandrajit Bajaj, Marc Van Kreveld, Valerio Pascucci, Daniel R. Schikore
For 2D or 3D meshes that represent the domain of continuous function to the reals, the contours---or isosurfaces---of a specified value are an important way to visualize the function. To find such...
Contour Trees and Small Seed Sets for Isosurface Traversal (1998)
Ren'e Van Oostrum, Chandrajit Bajaj, Marc Van Kreveld, Valerio Pascucci, Daniel R. Schikore
For 2D or 3D meshes that represent the domain of continuous function to the reals, the contours---or isosurfaces---of a specified value are an important way to visualize the function. To find such...
Contour Trees and Small Seed Sets for Isosurface Traversal (1998)
Ren'e Van Oostrum, Van Kreveld, Chandrajit Bajaj, Valerio Pascucci, Dan Schikore
For 2D or 3D meshes that represent a continuous function to the reals, the contours---or isosurfaces---of a specified value are an important way to visualize it. To find such contours, a seed set can...
Fast Isocontouring For Improved Interactivity (1998)
Chandrajit L. Bajaj, Valerio Pascucci, Daniel R. Schikore
We present an isocontouringalgorithm 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...
Chandrajit L. Bajaj, Valerio Pascucci, Daniel R. Schikore
We introduce the contour spectrum, a user interface component that improves qualitative user interaction and provides real-time exact quantification in the visualization of isocontours. The contour...
Chandrajit L. Bajaj, Valerio Pascucci, Daniel R. Schikore
We introduce the contour spectrum, a user interface component that improves qualitative user interaction and provides real-time exact quantification in the visualization of isocontours. The contour...
Chandrajit L. Bajaj, Valerio Pascucci, Daniel R. Schikore
We introduce the contour spectrum, a user interface component for improving user interaction and quantification in the visualization of isocontours. The contour spectrum is a signature consisting of...
Contour Trees and Small Seed Sets for Isosurface Traversal (1997)
Ren'e Van Oostrum, Van Kreveld, Chandrajit Bajaj, Valerio Pascucci, Dan Schikore
For 2D or 3D meshes that represent a continuous function to the reals, the contours---or isosurfaces---of a specified value are an important way to visualize it. To find such contours, a seed set can...
Fast Isocontouring for Improved Interactivity (1997)
Chandrajit L. Bajaj, Valerio Pascucci, Daniel R. Schikore
We present an isocontouringalgorithm 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...
Fast Isocontouring For Improved Interactivity (1996)
Chandrajit L. Bajaj, Valerio Pascucci, Daniel R. Schikore
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...
Splitting a Complex of Convex Polytopes In Any Dimension (1996)
Chandrajit L. Bajaj, Valerio Pascucci
Introduction We present a locality-based algorithm to solve the problem of splitting a complex of convex polytopes with a hyperplane or a convex subset of it. The solution to this problem has several...
Dimension-Independent Convex-Cell Based HPC: Representation Scheme and Implementation Issues (1995)
Valerio Pascucci, Vincenzo Ferrucci, Alberto Paoluzzi
This paper is devoted to the discussion of some of the design issues which concern the representation scheme underlying the geometrical nucleus of the PLASM design language. A central choice in the...
Multiresolution Molecular Shapes (1970)
Chandrajit L. Bajaj, Valerio Pascucci, Ariel Shamir, Robert J. Holt, Arun N. Netravali
We introduce a multiresolution representation scheme for variable levels of detail of molecular shapes (shapes synthesized as sets of balls). In particular, we consider in our model the exact...
Prototype Shape Modeling with a Design Language (1970)
Alberto Paoluzzi, Valerio Pascucci, Claudio Sansoni
A programming approach to the rapid prototyping of architectural design is discussed in this paper. This is done with particular reference to the early steps of design development, where a number of...