UV mapping for materials with no textures (image maps)

[art3mis]

Still a novice when it comes to UVmapping and texturing in general. One thing that has me confused about UV mapping. Are UV maps ONLY necessary when your materials contain some form of texture or image map data?

 

[f1480187]

You can use it for applying procedural textures too, it will act like rest position for noises and other nodes which require position input. Using rest position is preferred, however, since it does not introduce texture seams.