I was experimenting with the mapping equations in:

https://archive.bridgesmathart.org/2018/bridges2018-59.pdf

and crashed POV-Ray (3.8) about 6 times.

I'm guessing it has to do with trying to take square roots of something divided
by 0, or 0/0.
I haven't had a chance to scribble out a minimal .pov script to see what
triggers it.



I also was not able to get the mapping to work correctly - I'm guessing that I'm
going to have to apply the _inverse_ of the mapping - but I'm out of practice,
and can't see an easy way to go about that.

Any suggestions?

- BW

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