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Extraperlate constant movement before and after keyframes

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Mike Futcher
Extraperlate constant movement before and after keyframes
on Oct 25, 2018 at 10:11:39 am

Hello After Effects people.

I'm new to after effects, though I'm an experienced 3D animator with Blender.

I'm creating a video that will contain a lot of images scrolling past at a constant rate. From what I understand I can create a null and parent everything to it, but... is there a way I can set two keyframes - say at position 1 at frame 100 and position 2 at frame 200 and have the null move at the same constant rate both before frame 100 and after frame 200?

Thanks in advance,
Mike


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Walter Soyka
Re: Extraperlate constant movement before and after keyframes
on Oct 25, 2018 at 2:34:03 pm

You can use an expression. Alt+click on the stopwatch icon for the position property, then paste in this code:

if (numKeys > 1) {
if (time < key(1).time) loopIn("continue")
else loopOut("continue");
} else value;


Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive [twitter]   |   RenderBreak [blog]   |   Profile [LinkedIn]


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Mike Futcher
Re: Extraperlate constant movement before and after keyframes
on Oct 25, 2018 at 4:45:17 pm

Wow - I didn't think I'd be entering code so early, but you've explained very clearly how to do it - thanks!


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Dave LaRonde
Re: Extrapolate constant movement before and after keyframes
on Oct 25, 2018 at 5:25:03 pm

And there's often more than one way to skin a cat in AE. You can do the same thing with a second null:
  • Animate the first null's position at the point in time where you want it to occur.
  • Make a second null.
  • Parent the first null to the second null.
  • Animate the first null's position to move at a constant rate.
  • Tweak the first null's position values to taste to take movement from the second null into account.

No programming or expressions necessary.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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