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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, for example, someone riding up an escalator (Figure 13.37). 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 13.38). Fortunately, you don't have to painstakingly keyframe a layer's Rotation property to ensure that it remains oriented to the motion path; After Effects' Auto-Orient Rotation command does that for you. Technically, auto-orient rotation isn't a type of spatial interpolation; however, like an interpolation method, it does dictate the behavior of a layer along a motion path—and in so doing saves you a lot of keyframing work.

Figure 13.37. 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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