Both the tutorials by Smellenbergh ( http://users.skynet.be/smellenbergh
) and Mike Econym (http://www.econym.demon.co.uk/isotut/nfunc2.htm)
quote the phrase from the source code "a well known function in quantum
mechanics" when referring to the "func_11" in the isosurface libraries.
And both of them seem nonplussed by the phrase "a well known."
I'm a metallurgical engineer, not a doc--er--programmer. I remember
some college chemistry. It looks a whole lot like the shape of the
electron density cloud for one of the d orbitals. The d orbital is the
electron thingy that starts getting filled when you get to potassium in
the periodic table. See:
http://library.thinkquest.org/3659/structures/shapes.html
http://www.chem.mtu.edu/chemistry/PAGES/CLC/CH101/101Notes/chapters/chapter06.html
http://www.friesian.com/quanta.htm
Just in case anyone were demoralized by not knowing what it was: it's
probably something everyone was exposed to at one
time in high school chemistry. ;)
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