I'm trying to get a spray effect for a space ship thruster.. like this clip from the movie Gravity
https://www.dropbox.com/s/anyt2y021wskr ... p.mp4?dl=0
I can sort of achieve the effect using a particle system, but it fails in the physics department, since it doesn't take into account velocity from the ship when it's moving.. so it only shows as a "cone" when the ship is not moving - even then it's a bit wonky. otherwise with any ship movement it looks totally wrong...especially if the ship is moving the same direction of the particle cone, the ship overtakes the expelled particles and it doesn't look right at all.
so I was thinking to animate a sprite.. but besides drawing it by hand.. how would one animate something like that? to get like 15 frames or so.. I want to somehow capture a particle effect but I can't do that without printing the background image, then I'd have to somehow separate it so only the spray was on a transparent background... I've used Gimp and Inkscape a bunch but I think drawing it by hand will not look good (if I do it).