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Lesson 5. Particles and Parameter Behaviors > Using Parameter Behaviors

Using Parameter Behaviors

Our butterflies have come a long way, but it's important that they match up with the script. The script calls for the butterflies to explode out of the woman's hands. Right now they're streaming toward the camera. We need them to initially burst out in great numbers, with just a few stragglers to follow.

We need a way to control the birth rate of the butterflies; we want it to be high at first to create lots of butterflies and then taper off to a trickle. Those of you with a motion graphics background may already be thinking, “The behavior thing is cute, but now we need to reach for good old-fashioned keyframes.” We could keyframe the birth rate, but that would cause us to miss out on one of the most powerful features in Motion: parameter behaviors.


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