Hi Chris
I am not sure about the library you are using, but I used code that evaluates Perlin noise extended in 4D. If you write the code yourself, it’s easy to imagine how to do that. It’s been a long time, though, so I do not exactly remember all details. However, the Perlin noise and the Simplex noise components I wrote are published.
You can have a look at how that code is implemented, it’s a C# port of this paper:
http://staffwww.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf
Thanks,
Giulio
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Giulio Piacentino
for Robert McNeel & Associates
giulio@mcneel.com