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High-Quality Volume Rendering of Adaptive Mesh Refinement Data

  • Author(s): Weber, Gunther H.
  • Kreylos, Oliver
  • Ligocki, Terry J.
  • Shalf, John M.
  • Hagen, Hans
  • Hamann, Bernd
  • Joy, Ken
  • Ma, Kwan-Liu
  • et al.
Abstract

Adaptive mesh refinement (AMR) is a numerical simulation technique used in computational fluid dynamics (CFD). By using a set of nested grids of different resolutions, AMR combines the simplicity of structu red rectilinear grids with the ability to adapt to local changes in complexity in th e domain. Without proper interpolation on the boundaries of grids of different lev els of a hierarchy, discontinuities can arise. Treating locations of data values giv en at cell centers of AMR grids as vertices of a dual grid creates gaps between hierarchy levels. Using an index-based tessellation approach that fills these gaps with ``stitch cells'' we define an interpolation scheme that avoids discontinuities at level boundaries. We use the resulting interpolation scheme to generate volume-rendered images. Modifying transfer functions on a per-level basis allows us to emphasize (or de-emphasize) a specific level and gain a better understanding of the underlying hierarchical structure.

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