Yes, Bill - We've been here for a while now...

And you are right; I've been very busy the last years.
Not much time to do POV-Ray work =(
But you, IIRC, have always been - and still are - quite active in here.
Very good!

This Easter I've had some spare time. So, when you, in another post,
mentioned this recent 3Blue1Brown video for us (thank you btw.):

"How (and why) to take a logarithm of an image"
https://www.youtube.com/watch?v=ldxFjLJ3rVY&t=2462s

- I couldn't resist exploring the "Droste Effect" in Escher's
"Print Gallery" picture with POV-Ray. I've made some progress in
achieving this in POV-Ray. I'll post some of my results here.

Here are some other useful texts I've found regarding this topic:

"M.C. Escher: More Mathematics Than Meets the Eye" - By Sara Robinson
https://im-possible.info/english/articles/escher_printgallery/index.html

"A logarithmic image transformation" - by Jos Leys
https://www.josleys.com/article_show.php?id=82

As far as I can see, the page above has much the same contents as
the document below. But Firefox and Edge do not try to render the
jsMath formulas within it. The PDF file from the page below has the
formulas rendered, but it's behind a pay wall.

"The Droste effect image transformation" - by Jos Leys
https://www.sciencedirect.com/science/article/abs/pii/S0097849306002433

--
Tor Olav
http://subcube.com
https://github.com/t-o-k


"Bald Eagle" <cre### [at] netscapenet> wrote:
> Hi Tor!
>
> I've been bus reviewing all sorts of code, and that of course led me across all
> the different places that we've crossed paths.
> So I was literally just thinking about you for the past few days.
>
> I'm sure you're super busy as always, but hope that you get enough down-time to
> enjoy things.
>
> Thanks for that 26-year-old post. (!)
>
> What other dark secrets lay dormant in the POV-Ray parser, waiting to one day be
> awakened . . . ?
>
> - BE

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