i would like to know how to do the greyscale map you are talking about.
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dont know exactly what kind of texture methode you are using, but if you open your texture in photoshop you can make a black-white image of it ( this is also possible in lightwave ).
then open the surface editor and click on the t after the Bump setting. In the new window you can select your black-white image and when you are going to render you will see the result!!
don;t know if you understand me ( i hope you will
)
but i am a little bit drunk at the moment so don;t shoot me if you dont understand me hehe
good luck ( maybe another one can explain it better )!!