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Displaying 1-13 out of 13 total
Visualizing Nuclear Scission through a Multifield Extension of Topological Analysis
Found in: IEEE Transactions on Visualization and Computer Graphics
By David Duke,Hamish Carr,Aaron Knoll,Nicolas Schunck,Hai Ah Nam,Andrzej Staszczak
Issue Date:December 2012
pp. 2033-2040
In nuclear science, density functional theory (DFT) is a powerful tool to model the complex interactions within the atomic nucleus, and is the primary theoretical approach used by physicists seeking a better understanding of fission. However DFT simulation...
 
Revisiting Histograms and Isosurface Statistics
Found in: IEEE Transactions on Visualization and Computer Graphics
By Carlos E. Scheidegger, John M. Schreiner, Brian Duffy, Hamish Carr, Cláudio T. Silva
Issue Date:November 2008
pp. 1659-1666
Recent results have shown a link between geometric properties of isosurfaces and statistical properties of the underlying sampled data. However, this has two defects: not all of the properties described converge to the same solution, and the statistics com...
 
Interactive Comparison of Scalar Fields Based on Largest Contours with Applications to Flow Visualization
Found in: IEEE Transactions on Visualization and Computer Graphics
By Dominic Schneider, Alexander Wiebel, Hamish Carr, Mario Hlawitschka, Gerik Scheuermann
Issue Date:November 2008
pp. 1475-1482
Understanding fluid flow data, especially vortices, is still a challenging task. Sophisticated visualization tools help to gain insight. In this paper, we present a novel approach for the interactive comparison of scalar fields using isosurfaces, and its a...
 
On Histograms and Isosurface Statistics
Found in: IEEE Transactions on Visualization and Computer Graphics
By Hamish Carr,Duffy Brian,Denby Brian
Issue Date:September 2006
pp. 1259-1266
In this paper, we show that histograms represent spatial function distributions with a nearest neighbour interpolation. We confirm that this results in systematic underrepresentation of transitional features of the data, and provide new insight why this oc...
 
Drawing Contour Trees in the Plane
Found in: IEEE Transactions on Visualization and Computer Graphics
By Christian Heine,Dominic Schneider,Hamish Carr,Gerik Scheuermann
Issue Date:November 2011
pp. 1599-1611
The contour tree compactly describes scalar field topology. From the viewpoint of graph drawing, it is a tree with attributes at vertices and optionally on edges. Standard tree drawing algorithms emphasize structural properties of the tree and neglect the ...
 
Direct Interval Volume Visualization
Found in: IEEE Transactions on Visualization and Computer Graphics
By Marco Ament, Daniel Weiskopf, Hamish Carr
Issue Date:November 2010
pp. 1505-1514
We extend direct volume rendering with a unified model for generalized isosurfaces, also called interval volumes, allowing a wider spectrum of visual classification. We generalize the concept of scale-invariant opacity—typical for isosurface rend...
 
Subdivision Analysis of the Trilinear Interpolant
Found in: IEEE Transactions on Visualization and Computer Graphics
By Hamish Carr, Nelson Max
Issue Date:July 2010
pp. 533-547
Isosurfaces are fundamental volumetric visualization tools and are generated by approximating contours of trilinearly interpolated scalar fields. While a complete set of cases has recently been published by Nielson, the formal proof that these cases are th...
 
Artifacts Caused by Simplicial Subdivision
Found in: IEEE Transactions on Visualization and Computer Graphics
By Hamish Carr, Torsten Möller, Jack Snoeyink
Issue Date:March 2006
pp. 231-242
<p><b>Abstract</b>—We review schemes for dividing cubic cells into simplices (tetrahedra) for interpolating from sampled data to <tmath>{\hbox{\rlap{I}\kern 2.0pt{\hbox{R}}}}^3</tmath>, present visual and geometric artifacts g...
 
Simplifying Flexible Isosurfaces Using Local Geometric Measures
Found in: Visualization Conference, IEEE
By Hamish Carr, Jack Snoeyink, Michiel van de Panne
Issue Date:October 2004
pp. 497-504
The contour tree, an abstraction of a scalar field that encodes the nesting relationships of isosurfaces, can be used to accelerate isosurface extraction, to identify important isovalues for volume-rendering transfer functions, and to guide exploratory vis...
 
Joint Contour Nets
Found in: IEEE Transactions on Visualization and Computer Graphics
By Hamish Carr,David Duke
Issue Date:August 2014
pp. 1100-1113
Contour Trees and Reeb Graphs are firmly embedded in scientific visualization for analysing univariate (scalar) fields. We generalize this analysis to multivariate fields with a data structure called the Joint Contour Net that quantizes the variation of mu...
   
Simplicial Subdivisions and Sampling Artifacts
Found in: Visualization Conference, IEEE
By Hamish Carr, Torsten Möller, Jack Snoeyink
Issue Date:October 2001
pp. N/A
We review several schemes for dividing cubical cells into simplices (tetrahedra) in 3D for interpolating from sampled data to IR³ or for computing isosurfaces by barycentric interpolation. We present test data that reveal the geometric artifacts that these...
 
Accelerating marching cubes with graphics hardware
Found in: Proceedings of the 2006 conference of the Center for Advanced Studies on Collaborative research (CASCON '06)
By Gunnar Johansson, Hamish Carr
Issue Date:October 2006
pp. 39-es
Medical imaging and scientific simulation produce large volumetric datasets, which are often visualized by isosurface extraction and rendering. This extracts individual surfaces from the volume to represent significant boundaries in the volume. The standar...
     
Modified marching octahedra for optimal regular meshes
Found in: ACM SIGGRAPH 2002 conference abstracts and applications (SIGGRAPH '02)
By Hamish Carr, Thomas Theuel, Torsten Moller
Issue Date:July 2002
pp. 219-219
Theußl et al. [Theußl et al. 2001] showed that volumetric data sampled on a body-centred cubic (BCC) lattice is nearly 30% more efficient than data sampled on a cubic lattice, and produced volume renderings using splatting. We extend this work to...
     
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