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I would like to render volumetric clouds in OpenGL.
I found an interesting paper that describes a simple technique to render volumetric clouds.
(http://www.inframez.com/events_volclouds_slide18.htm)
However I don’t know how to create their “fractal cube” (or perlin-noise cube).
My question is: how to create the 6 tileable fractal textures of a cube?
Edit: my aim is to make a volumetric cloud object, not a cloud skybox.
A nice introduction to Perlin noise, written by Ken Perlin himself, is here. He talks about generating a one or two dimensional noise function in some detail, and then generalises it to show how it would work in 3D, to generate a solid cube of noise like you want.