Does anybody have any idea how they did the really big explosion in the new Battlefield 4 gameplay trailer? http://http://www.youtube.com/watch?feature=player_detailpage&v=U8HVQXkeU8U
about 9:10 in.
The rest of the pfx work looks like sprite work (really nice sprites but still) but that kind of rolling explosion is so hard to do with sprites. Maybe flowmaps on sprites i guess?
Really wish i had a copy of the Frostbite 2 engine to play with