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Wiggles forward, never back.
Say I want to animate something to move from left to right. I want to vary the speed with an expression, like wiggle, but I don’t want it to back-track.
What’s a good simple way to handle this?
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5 Replies
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I could also do the motion at a constant speed, pre-compose it, and then apply an expression to the time remapping, but that will go backwards, too, if I just apply a wiggle.
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I’m not in front of an AE station, but try this. Animate the X position from left to right as you mentioned. Now apply the wiggler to the X ANCHOR position. As long as you don’t make the anchor move back to the left faster than you are moving the position to the right…it SHOULD just look like it’s stalling and speeding up. Not sure…try it and see.
Alex
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“As long as you don’t make the anchor move back to the left faster than you are moving the position to the right”
That might be the key point I’m sticking on. How do I determine the wiggle’s top speed?
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Heh yeah, I know what you are saying. I barely made it through Maths at school so I won’t pretend I know the formula to determine this. I would just set up the average speed of movement from left to right in POSITION, then have a look how many pixels it moves each frame. Say 5 pixels. Then I’d wiggle the anchor X position by no more than 5 per frame (or 10 every 2 frames etc). In theory, you should be able to get it to never go back. Of course, after eyeballing all this with trial and error, I would just quickly step through the frames to make sure it definately isn’t stepping back.
Good luck
Alex
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So you’re saying just do it by hand?
If I’m doing it by hand, I’m going with time displacement. Maybe it won’t be as bad as I thought, at first.
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