Visualization

To better understand the mechanisms being modeled by the ANU-CTM, sophisticated visualization techniques were utilized to produce an animated graphical representation of the data. Air parcels contain varying radioactive tracer concentrations as they disperse from the release point in Turkey and mix with other air parcels. In this visualisation only the 500 most concentrated air parcels are plotted, from the simulation set of 100,000. The air parcels are rendered as spheres with concentration mapped to colour, size and transparency. The daily data is spaced 10 frames apart, with the positions of the air parcels being interpolated through intermediary frames. This accounts for the regular bouncing motion seen in the animation. The height scale is exaggerated to show the topographic and field data more clearly.

We used the animation package Houdini produced by SideFX to visualize the simulation results. The data was precalculated and the model was previewed in real-time on a Silicon Graphics Oynx Reality Engine workstation provided the ANU Supercomputer Facility Vizlab. Final images were rendered on the ANUSF SGI Power Challenge. The resulting animation was output to video from Avid Illusion and a smaller, shorter version of the simulation was produced as well with one day represented as a single frame, suitable for viewing on the World Wide Web.

Model results...

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