Camera wobbles on too long spline (100km+)

[_Aka_]

For future reference:

The spline did not come from the controller, but from the code computing the spline's tangent. That code does not give precise enough computations when it comes to very long splines

I am aiming at enhancing that code for the next release. Until then, a work around is to use Direction Damping Time and Up Damping Time to non zero values. This will smooth the tangent and direction used by the controller:
https://curvyeditor.com/documentation/controllers?redirect=1#direction_damping_time