My guess is that you’re adding linear spline points. Rather than curves, you’re getting straight lines. Your rotations are fine but we can’t see it as there is no time for us to register what’s happening at spline point.
Please do visualise your spline as suggested above - so you can see how it looks like in game.
- Your spline probably looks like this:
- While you may want this instead:
Add this to the generation:
Alternatively, you can manually calculate tangents if the auto method is not good enough:
