[ODE] constrain object to curve?

[Daniel Holth]

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I want to simulate a train (by constraining an object to a bezier curve
that will serve as the track). I assume I can do this by applying forces
to my object at each timestep that push it towards the point on the
curve closest to its current location.

I don't have the maths worked out yet. Does this list have any pointers
on how to achieve my goal?

Thanks,

Daniel Holth
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