 Particles can change colors and size over time, animate in a variety of different ways, or grow denser or thinner over time, to name a few things.For an explosion, for example, a user'd want the particles to start small, grow in size quickly and slowly stop expanding; the material would morph from bright yellow/white to orange, red, and finally into a dark gray or black, animating quickly at first, and then slowing down to a clouding smoke.AfterBurn has been used in a number of feature films, some of which include