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I've added a new action: FollowWaypoints.
Used along with the Waypoint class, this action causes particles to follow waypoints in series, creating a path-finding behavior. There's also an option for whether particles loop back to the first waypoint after passing through the last waypoint. A 3D version is available as well: the FollowWaypoints3D class.
The algorithm used by the FollowWaypoints class was inspired by the Path Finding section in the Steering Behavior chapter of AdvancED ActionScript 3.0 Animation, by Keith Peters.