Paul Rajlich
Research Programmer
Visualization and Virtual Environments
National Center for Supercomputing Applications

I developed a couple of simple VTK applications to interactively visualize AMR (adaptive mesh refinement) data from FLASH simulations. These two tools were used to look at a 128^3 test problem that the NCSA Cosmological Simulation Group ran on NCSA supercomputers. The test problem is related to the formation of clusters of galaxies. More information on the science at Paul Ricker's homepage

The first tool is a point renderer that allows you to interactively visualize the AMR FLASH dataset. Modern graphics hardware can render large numbers of points at interactive speeds. The images above are not that interesting. It is by rotating the data that you begin to understand the structure. The tool allows you to vary the point size and the threshold. Smaller point sizes (above right) allow you to look within the volume whereas large point sizes (above left) more clearly show the structure of the data.

The second tool makes use of two VTK volume rendering techniques to look at the data. In order for this to work, the AMR data has to first be resampled to a regular grid (vtkStructuredPoints) as that is what VTK expects for its volume rendering filters. Again, this is an interactive tool that allows you to rotate the data at reasonable framerates.

(C)opyright 2003, Paul Rajlich       Want to see what I am doing now? Visit