One more stupid question, and this one is probably for bagginsbill to answer since he's examined the materials and how Luxrender uses them probably more than the rest of us...

Is it possible in Luxrender to mix a material by either a function, like a noise type, so that something can be made such as a rock material with moss speckled on it? I guess it would need to apply to bump functions as well... Is there also a way to mix materials by altitude with a thickness component, such as a glass and a matte for instance so that it looks like there's a thick coating of clear glass over a something inside, such as a marble? I'm just curious (and probably thinking waaaayyyy too much...lol).

Laurie