Natural effects like rain, snow, fog, and so on, are also generators, and are needed for several reasons. Their use allows the filmmaker to choose the ideal filming location, and to stay warm and dry! With the magic of After Effects, you can realistically generate rain, and quickly change a scene from a sunny day, to a cold, dark, rainy day. You are in control: Should you want to increase the amount of rain coming down just a little, you can add those elements after the fact in postproduction with the use of generators.

Much of this chapter deals with adding movement to a still photo by adding natural effects. There are many reasons you may want to add movement to a still photo. Maybe you need a quick background ...

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