Dave Hodgins: The destruction of ships and buildings were accomplished through our Houdini pipeline. Using gas sims for explosions and fluid sims for the splashes of ships crashing into water we straddled the line of realism and readability. With the ships flying at such high speeds some effects would become blurs and lose the detail that we wanted. Some smoke volumes needed to be bigger just to stay on screen long enough so there were various cheats taking place to carry out the story point in each shot.