For any modders out there who aren't already aware of it, there is a whole gold mine of secial FX goodies, in .nif format, in the unpacked /art directory of Civ4. I have had some success slapping some of these into unit art def's or feature def's. FX that this has worked with include fireworks, propellor bubbles, dust impact, fog (though it's very hard to see), maybe some others. However, a good number of the FX are non-repeating (e.g. wind swirl). This means that instead of playing over and over again, it plays once, when the unit/feature is first instatiated, and never plays again. Does anyone have any ideas on how to make these FX repeat? Is it a matter of creating a "Meta-NIF" that invokes the NIF? If so, this would provide us with a quick source of some cheap "units," e.g. by making the wind swirl repeat (and perhaps overlap itself) you'd create a tornado or hurricane.