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Using a slider to vary time between keyframes within a loopOut
Hello, I have an animation of a bird flapping its wings in 3D space. The various parts of the bird have 6 or 9 keyframes (depending on the part) on the Y Rotate over 15 frames to create a flap cycle. Each Y Rotate has a loopOut cycle expression so that the single cycle will be repeated.
What I want to do is create a slider that will increase the duration of the flap cycle in order to easily animate the bird landing and taking off. Is there a way to do this?
Thanks in advance.
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6 Replies
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You could just multiply the time by the slider amount. That would work for using a different speed, but you’d run into weird problems if you animated the slider value.
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Well that is what I was intending to do in order to make it slow down.
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Yeah, the problem there is that when you change a multiple of time with a slider, it’ll give you that new different multiple counted up from the beginning. So it’ll work fine when its always that same number, but when you change it, it’ll recalculate weirdly from the beginning and result in strangely skipping frames. Its not cumulative unfortunately. Maybe Dan has a solution, I don’t know.
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I tried doing it a different way by creating a sin wave with the expression below
freq = 1
amp = 80
amp*Math.sin(freq*time*2*Math.PI);
This creates and oscillating motion which will work for the individual parts of the bird. From here I thought I could simply add the slider to the freq and control it that way. This almost works but yet falls short. If I keyframe the slider so it goes from 0 to 1 it will start with low frequencies and increase to a higher frequency, however, the frequency will be higher than 1. As soon as it hits the 1 keyframe it will level out to the proper frequency.
Similarly, when dropping from a frequency of 2 to 1 it will start at 2, drop to 0 and then instantly go back up to 1.
So maybe there is another place to add the slider.
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If you haven’t see this, it may help explain what you’re up against:
https://www.motionscript.com/articles/speed-control.html
There are solutions, but nothing simple.
Dan
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Dan, I got something for you
From hence forth you shall be called King Dan, lord of the after effects.
That solution worked PERFECTLY.
Thank you so much!
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