P.S. here is a sketch with some ideas. I hope that comes closest to a Ball-Coaster-Creator.
Scene file and a one minute intro. “
https://www.amazon.com/_01.c4d”/share/O7Fx9IGVacZt2ghbbwDs5htOCLSnqFEEuaJMz7o9wue
It is based on an initial spline path (flat) and a texture (which can be also a painted image.
From there all information is taken to create the complete set up. Two versions on how to build the construction are also included.
I use the MoSpline with the Ball at 100% of the Align to Spline and use the MoSpline End parameter to drive the animation. This gives me the length of the MoSpline from start to the Ball. Which includes all needed parameter (plus the Ball radius) to calculate the ball rolling.
Again, just a collection of ideas.
Edit: perhaps a little bit the same, but more straight forward, again file and clip below: “…_11.c4d”
https://www.amazon.com/clouddrive/share/5rpoMbVu0el080bd4xqQEMrMWhSVYrKa7vZWWj4MR72
In the last 15 seconds of the clip I show where the flat (XZ plane) spline has to be connected if you need a new spline)
Preview of the ride itself. Background CV-HDRI, Maxime Roz
https://www.amazon.com/clouddrive/share/52EaGeYQKLlGK7eO2sv6LRM0yagX42IHVLrEIc83w0X
Cheers