"a universal way to turn procedural textures into texture maps is to apply the procedural texture to a flat surface, and make a rendering of the surface. The rendered texture can then be applied as a map on different objects.... another reason to convert procedural textures into bitmaps is to move textured models between different programs."  from "Digital Lighting and Rendering" y Jeremy Birn, p. 327.

If you have many procedural textures to deal with, this may not be practical. Still, no one mentioned it and it seems like a good thing to know.