Smart smoke?
Any physically-based modelling or dynamics can be implemented very
elegantly within IPAS3. The UI for those routines can be extremely
interactive and complex… as much as the core program itself is.
Brett Malnick (Positron) has already announced a 3DS IPAS3 version of
the dynamics packages he's about to ship for Lightwave. And any
effect possible with the upcoming Wavefront Dynamation package is
going to be possible in IPAS3 as well.