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Adrien-Luc's Animation Blog

By Adrien-Luc Sanders, About.com Guide to Animation since 2005

Motion Tweening Expanded: Easing and Rotation

Friday April 4, 2008
You've mastered the basics of the motion tween. You can make an object move horizontally, diagonally, and vertically from point A to point B, then point C, then point - well, you get the idea. It's a pretty easy process and the first time you do it (especially after years of painstakingly animating something as simple as linear motion frame by frame) you can feel like you own the world. But you can also own your animation a little more by adding two things to the tween: rotation, and easing. Rotation lets you make the object tumble end over end, clockwise or counterclockwise, either static or while moving along a tweened path for as many rotations as you want for the frame duration of the scene. Easing lets you control the speed of the animation a little more, by making it start off slow and speed up (easing in) or start off fast and slow down (easing out).

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