Lightwave has something called "channel modifiers." Essentially what these do is modify the function curve for a particular channel in some way. One of my favorites is "Noisy Channel."
Noisy channel adds a sort of perlin noise (http://students.vassar.edu/mazucker/code/perlin-noise-math-faq.html) to the function curve. I have a screenshot if anyone needs to see it to understand, but no place to host it currently to put it here. This is great for randomly swaying a tree in the breeze or adding a slight oscilation to a hovering robot.
So..given Hash's expressions (http://www.hash.com/am2003/Expressions/Index.htm)...how would I duplicate a 2d perlin noise function (math is in the perlin link above) so that I could, for example, apply it to a null and then use that null additvely with the channel for the model? Or should I just ask for Hash to add a perlin noise expression?
thanks in advance!