Many years ago, alphaQuad aka Melody issued a glory ping pong challenge,
but was quite unsuccessful.

http://news.povray.org/povray.binaries.images/thread/%3Cweb.4834b239d2ad962989f6d7ba0%40news.povray.org%3E/

I tried my own tests, with unsatisfying results.  milco2006 had more
success, but warned it was probably not what alphaQuad was looking for.

Then I came across this video: https://youtu.be/24GfgNtnjXc

At 21:33, the video explains that glories rely on diffraction
interference; but, aside from the irid feature, POV-Ray doesn't do
diffraction!  It seems that glories were a fool's errand on this
platform... unless...

Unless someone can think of some clever way to simulate diffractive
effects.  I won't say it can't be done; that would only ensure that it
*won't* be done.  Perhaps some clever (ab)use of irid?  Or finding a way
to accurately fake it with regular ior and dispersion?

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