I did use a circle… been a while.
One thing to be aware of is that if you are going to loop the animation…Cinema auto eases the keyframes, so you’ll get a speed up at the beginning and a slow down at the end. If you plan on looping you’ll need to change the interpolation of the two keyframes.
As you’ll see in the comments, there are several ways to do this exact thing. You could animate the circle rather than the position of the Align to Spline tag.
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Tim Shetz
c4dtraining.com