If you paste the path into a Null’s position, you’ll get a motion path with a duration of 2 seconds. Then if you have a slider going from 0 to 100 to represent percentage of travel along the path, you can you use an expression like this for your triangle:

 

s = (your slider value);

thisComp.layer(“Null 1”).transform.position.valueAtTime(2*s/100)

 

Something like that.

 

Dan

 

From: Brian Behm

Sent: Sunday, April 28, 2013 1:28 PM

To: After Effects Mail List

Subject: [AE] Offset along motion path?

 

Hey everybody,

   quick question that's been confounding me. I have a race track simulation I'm developing for an info graphic and I have two representative triangles that I want to animate along the path. Because they're going different speeds, I want to be able to parent them to the path but not lock them into a specific time so that I can animate the offset along the path. Sort of like how Trapcode 3D stroke can animate along a portion of the path.

 

I know I can paste motion paths into After Effects, but that doesn't solve what I want it to do. Is there a way to constrain motion to a path without constraining it to a specific time?

 

Brian

 

Brian Behm | Art Director
Rooster Teeth Productions
636 Ralph Ablanedo
Austin, TX  78748
office 512-480-0336
mobile 512-965-7914