Well actually POV-Ray (Persistence of Vision Raytracer) tracing based on the brilliant pages by Andrea and Friedrich A. Lohmüller at http://www.f-lohmueller.de/index.htm .
I have been experimenting with POV-Ray on my regular desktop PC, which runs Arch Linux and I found povray – POV-Ray: The Persistence of Vision Ray Tracer quite easy to install via sudo pacman -S povray. The Lohmüller’s site provided everything else that I needed – except perhaps a few months more learning and practice.
povray -orainbow.png -w400 -h300 rainbow.pov.
povray Rocker_0_demo.ini=> 45 numbered .png images
convert -delay 10 -loop 0 Rocker_0_demo*.png Rocker_0_demo.giftakes all of the source frames and makes them into one animated GIF image. The -delay 10 argument causes a 10 hundredths of a second delay between each frame, and the -loop 0 causes the gif to loop over and over again.