River Rapids Park (Prototype)

This is a river rapids prototype. The script takes advantage of an invisible (unfrozen) track with the "Hide Wireframe" option checked in the editor. It then attaches the boats to the invisible cars on the track and produces the appropriate motion according to where the boat is on the track. Currently there is no side-to-side motion but that would be trivial to add. More sophisticated would be physics-based motion engine that would allow the boats to interact with the trench walls. In any case this is only meant to be an example. Feel free to take the script and make it your own. :)