Dale: Bizarre, I thought I'd seen documentation on retreiving wind velocity too, blowed if I can find it now though! I think I'll try setting up a scene with wind, then enumererate all objects and see if anything turns up. I'm actually working on particle systems, and, apart from spending ages searching for aforementioned info, I keep getting sidetracked by realisations of what could also be acheived in terms of fire, smoke, waves, just about anything, so breath holding inadvisable.