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Chapter 13. Keyframe Interpolation > Auto-Orient Rotation

Auto-Orient Rotation

As a layer follows a motion path, its rotation remains unaffected. In other words, the layer maintains its upright position as it follows the path: picture someone riding up an escalator (Figure 13.38). Frequently, you want the object to orient its rotation to remain perpendicular to the motion path: now picture a roller coaster climbing a hill (Figure 13.39). Fortunately, you don't have to painstakingly keyframe a layer's rotation property in order to keep it oriented to the motion path—After Effects'Auto-Orient Rotation command does it for you. Technically, auto-orient rotation isn't a type of spatial interpolation. But like an interpolation method, it does dictate the behavior of a layer all along a motion path, and saves you a lot of keyframing work.

Figure 13.38. Without auto-orient rotation, objects remain upright as they follow the motion path, unless you add rotation. Notice that the ant remains parallel to the window frame.



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