Authors:
Jonathan Fischer
1
;
Martin Schulze
1
;
Paul Rosenthal
2
and
Lars Linsen
3
Affiliations:
1
Department of Computer Science, Chemnitz Technical University, Str. der Nationen 62, 09111 Chemnitz, Germany
;
2
Institute for Visual and Analytic Computing, University of Rostock, Albert-Einstein-Str. 22, 18059 Rostock, Germany
;
3
Institute of Computer Science, University of Münster, Einsteinstr. 62, 48149 Münster, Germany
Keyword(s):
Scientific Visualization, Ray Casting, Higher-Order Approximation, Volume Rendering, Scattered Data, SPH.
Abstract:
When employing Direct Volume Rendering (DVR) for visualizing volumetric scalar fields, classification is generally performed on a piecewise constant or piecewise linear approximation of the field on a viewing ray. Smoothed Particle Hydrodynamics (SPH) data sets define volumetric scalar fields as the sum of individual particle contributions, at highly varying spatial resolution. We present an approach for approximating SPH scalar fields along viewing rays with piecewise polynomial functions of higher order. This is done by approximating each particle contribution individually and then efficiently summing the results, thus generating a higher-order representation of the field with a resolution adapting to the data resolution in the volume.