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Stunning Volume rendering with Nvidia IndeX on Paraview

Updated: Jun 6, 2020

In continuation of my previous post, there were a lot of progress in made in the cloud crushing simulations in the Circumgalactic medium. In this blog, I demonstrate a new plugin in Paraview called Nvidia IndeX which allows real time volume rendering of 3D datasets. With these, one can create some stunning visualizations.

It also has some cool presets to highlight features in the data such as depth and edge enhancements. I personally have to try these presets more extensively before making any review on that. (stay tuned!)

Here I demonstrate one such volume rendering of radiative cooling dominated clouds getting crushed in hot head wind. But with strong cooling of optically thin plasma (which makes these clouds), cold gas gains a lot of momentum and forms slender cucumber shaped dense clouds. The volume rendering is done on a sub-sampled 3D data from a high resolution dataset. The simulations are run with Pluto hydro code for astrophysics.

Some few tricks here and there on the transfer function, fiddling around with colormaps and camera paths and focus, I was able to make these visualizations. The data used is the field of a passive tracer in the simulation which is used to mark the initial cloud.

A big shoutout to my collaborator Vijit Kanjilal for sharing with me the data of some of his high resolution runs and also to the Nvidia IndeX team and SERC supercomputing helpdesk at IISc for all the technical helps.

The next one is a completely different test problem. It shows Rayleigh-Taylor instability in fluids. The simulations are done using Athena hydro code for astrophysics. The visualization here shows volume rendering of density field with Nvidia IndeX plugin on Paraview as the turbulent instability grows and the growth of initial perturbation becomes highly non-linear.

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