control path length using expressions

[Alex Printz]

I have built a trim paths expression to do this in the past.

IIRC, you need to make a slider to set the ‘full’ length, then create a loop that measures the distances between pointOnPaths on a spline and adds them together, compares that to the ‘full’ length, and if the current spline is measured longer than that trim that percentage. I used a 2nd slider to set the number of points to compare (I think I liked around 12 or so, not too many to bog the system, not too few to look choppy)

It worked well for what I needed to do (swinging rope I think?)

Alex Printz
Mograph Designer