Instead take a look at figure B: it is a green FBM noise applied to a white surface with default lightwave settings. The first thing we notice is that we dont have a green color covering everything but some nice random splotch all around the surface, FBM noise yet lets us notice the white behind it. ![](http://www2.3dluvr.com/2004/08/141/figureB_s.jpg)
Figure B lets apply this and dirty a metal surface for example ![](http://www2.3dluvr.com/2004/08/141/figureC_s.jpg)
Fig. C figure C shows a metal image map applied on the previous plane,it has some nice detail but we want to dirt more so we apply a layer of black FBM noise over it
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