I've been a LOOONG time POVRay user and in the past year have been using POVRay
to help visualize the electromagnetic fields within EMDrive simulations.  The
full playlist is here:
https://www.youtube.com/playlist?list=PL8UnWMwDHwHOAvpjW01xXteIwMGhY9ET5
but the best of the lot - highest density anyway - is here:
https://youtu.be/9mxpEtkCxNc
These are generated from a tool called 'meep' from MIT which does
electromagnetic and optical cavity simulations.  These generate HDF files which
I then export slices from and save as CSV files (using standard HDF tools).  I
wrote a C++ program to convert the CSV files to a POVRay ".inc" file.
More on my investigations into the EMDrive with links to the C++ tool are here:
https://vaxheadroom.wordpress.com/2015/11/28/rf-drive-to-the-stars/

Thanks to everybody who helps keep POVRay alive :)
-- Emory Stagmer aka VAXHeadroom

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