How can this be extended to be used in 3D Graphics?

[knightcube]

I am using three.js to create dynamic geometries using this tutorial.

I tried replacing the following two lines of code

var value = noise.perlin2(x, y);
var value = noise.perlin3(x, y, z);

with this,

var value = perlin.get(x,y)

But it would be great if I could add a z property too

[obscuredc]

I know it's been 2+ years, but for anybody else:
I bet you could edit the current code by following wikipedia's guide to creating the algorithm and using the preexisting dot_prod and smootherstep functions to extend the function to include a z component
edit: specifically, here:

...using a three-dimensional approach by interpolating between 8 corners of a cube instead of the 4 corners of a square below.