Creating motion paths with masksYou can instantly create a motion path from any mask that you draw in After Effects (or from a path that you copy from Adobe Illustrator or Adobe Photoshop), by pasting the mask or path into a layer's Position property, a layer's Anchor Point property, or the effect point property of an effect. The assigned keyframes are set to rove in time, except for the first and last ones, to create a constant velocity along the mask or path. By default, After Effects assigns a duration of 2 seconds to the motion path. Adjust the default duration by dragging the first or last keyframe to a new point in time. To create a motion path from a mask:
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