Applying a Single Material to a Textured Hierarchy in Cinema 4D
This tip covers a strange technique for covering an already textured object in a uniform material. It leverages a specific behavior of Cinema 4D.
See the full blog post here: http://jamie3d.com/?p=52405
alflud has recommended this script that offers similar functionality, in the comments below: http://www.rendertom.com/scripts/material-override/