I was wondering if it was possible to add a Heaviside step function for
use in isosurfaces:

say two arguments, the first is the "switch" point, where the function
goes from 0 to 1 (or vice versa), and the second is the argument, which
would be a good place to put x, y, z or whatever for the expression.

I was thinking about this for say, limiting a sinusoid to a particular
range, by multiplying it by a step function (two actually, one to
truncate each end of it). It could have other uses, I guess.....

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