PovRay files used to generate animations for

Magical Magnetic Resonance Imaging talk

PovRay animation output is a set of numbered png files. The can be
combine into a movie with a seperate porgram. I used ImageJ from the
NIH.  use:
   File->Import->Image Sequence

and then
   File->Save As->AVI   (then choose 30 fps)

You will need either some patience or a fairly capable PC for rendering and converting. 

Richard Ansorge 15 November 2016