[ODE] Contact sound generation

[Jon Watte]

> > You are entering the exciting world..

> Thanks for the quick synopsis Jon, what a cool area it looks to be.

And, because I hadn't been paying attention for two years, exactly 
how active it is amazes me. The paper posted by Tyler is pretty neat 
for percussive sounds (forming sound out of impulses plus resonant 
modes) -- I tracked down the accompanying video:

http://www.cs.berkeley.edu/b-cam/Papers/obrien-2002-SSR/Stuff/all_divx_640x480.avi

In one view of the world, anything percussive is just impulse + 
resonance, and this seems to take care of the resonance part just 
fine. At the mere cost of 800 complex multiply-adds per object 
per sample frame, I can think of some fill-limited games that could 
quite likely benefit from this!

Now, as for modeling a struck spring that flexes depending on how 
hard you bend it... or a dead body scraping across gravel... ;-)

Cheers,

			/ h+