> Or is it only useful for animations?

After thinking about this a bit, I realize that there are occasional
instances where it's useful to have 4D noise in a still image. Mainly, you
might be creating a function which relies on the random noise function
twice. It needs two similar random noise functions, but they can't be
identical. (Perhaps you're creating a 3D vector with 3 functions, one for x,
one for y, one for z, which you normalize. Perhaps you're simulating
turbulence somehow. Maybe you just want to see what noise1() + noise2()
turns out to be.) By taking different slices of the 4D noise function, you
can get these two similar noise functions that aren't identical.

 - Slime
[ http://www.slimeland.com/ ]

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