Thanks Will! And thanks for putting that action script together, I've had a few people ask me already if there was a way to do the math outside of UDK. Cheers!
I started thinking about that the other day in my head, there's no way (that I know of) for the material to influence the position or velocity of a particle. I should sit down and play around with that to see what I can find. However I hear that UE4 has some new particle-specific material expressions that will help for…