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Modifying Curves

Motion lets you manipulate not just the keyframes themselves, but the curves between the keyframes. You can use preset interpolation methods that create more realistic animations by simulating momentum, inertia, or gravity, and you have full control to adjust the interpolation to fit your needs. You can also extrapolate a curve to create several types of continuing animation before the first keyframe or after the last one.

Changing keyframe interpolation

You can think of interpolation as the change in the velocity, or the rate of change of an animation between keyframes. By default, Motion animates values between keyframes in a linear fashion with no acceleration at all. This means, for example, if an object is animated to move 100 pixels across the Canvas over the course of 5 seconds, it moves at a steady, linear rate of 20 pixels per second—it never speeds up or slows down, it’s either at rest or it’s moving at a constant rate. By changing the interpolation method for a curve, you can cause the object to start out slowly, speed up, and then slow down again before coming to a rest, resulting in a much more natural, realistic animation.


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