Creating splines at run time

[_Aka_]

Adding and removing each frame a CP for preview is not the best way. A better way is to add the preview CP once, and then update it's position each frame.

If you want still want to completely avoid adding a CP, you can the interpolation methods directly (like CurvySpline.Bezier(...)), but then you will have to understand the maths behind that to use it properly. If you still want to do that, check how those methods are used in CurvySpline's public Vector3 Interpolate(float localF, Space space = Space.Self)