-- [ Picked text/plain from multipart/alternative ] The env_steam entity, when the 'particle type' is set to 'heat wave' could produce a smilar effect to what you're looking for (maybe it would be a good starting point to work off of). Remember the Ravenholm levels with the propane tank canister? You turn the valve and gas was expelled from nozzles laid about on the ground, distorting the ground. That's the effect. It can cause lots of lag, though. --
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