Well for demonstration of this point, here's my freebie "dirt/grunge" material layer for Vue8 and above :)

http://www.silverblades-suitcase.com/vue_mats/Steves_Layered_Dirt_V8.zip

 

 

it works both procedurally AND with a texture, I put input nodes in for such (you nna blend them), so you can for example, use a UV map to drive specific placement of grunge/dirt, which is how I make ship decks/hulls have staining drippign down them, or in certian areas etc.

:)

 

 

 

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