The dust from the desert is just simple particle dynamics, it will be set at keyframe or an expression has been used to get them to start reacting
https://legacy.gnomononline.com/tutor...?category_id=8
The second one down is Collision Emission, and will give you a smal understanding on how to use them.
Chris (formerly R@nSiD)
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Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)