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Designate the first vertex for a Bezier pathTo animate a path, After Effects designates the topmost vertex at the initial keyframe as the first vertex and numbers each successive vertex in ascending order from the first vertex. After Effects then assigns the same numbers to the corresponding vertices at all successive keyframes. After Effects interpolates the movement of each vertex from its initial position at one keyframe to the position of the correspondingly numbered vertex at the next keyframe. At any time during an animation, you can designate another vertex as the first vertex; this causes After Effects to renumber the vertices of the path. Renumbering vertices causes path animation to change, because After Effects then maps the new vertex numbers to the corresponding old vertex numbers still saved at successive keyframes. When copying a closed path into a motion path, the vertex designated as the first vertex of the closed path is used as the beginning of the motion path. All motion paths are open paths. Some shape path operations, such as Trim Paths, also use the first vertex as input to determine how to modify the path. Note: By
default, when you add a vertex to a path, the new vertex appears
on the path throughout the duration of the path but reshapes the
path only at the time at which it was added. When you delete a vertex
from a path at a specific point in time, the vertex is deleted from
the path throughout the duration of the path. Prevent After Effects
from adding and deleting vertices throughout the duration of the
path by choosing Edit > Preferences > General
(Windows) or After Effects > Preferences > General
(Mac OS), and deselecting Preserve Constant Vertex Count When Editing Masks.
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