Texturing DVD - leveling
Just a quick message to give you my opinion on something. I do agree that you should level all your maps to get the most out of the exposure of the texture, but I do not agree that you should do that on metal!
Metal is flat, metal is dull, more often than not. And if you level a metal map, you'll make it noisy and more corrugated than it would look in real life, making it look more like concrete than metal.
Metal should be very flat in the dif, and maybe a bit noisy and scratchy in the spec, a good cubemap also helps selling metal well.