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Bounce at regular interval
Hi there-
Can anyone help me with an expression that makes a layer bounce at a constant pace. I want to time a bouncing layer to the beat of some music, so the expression would need to be minutely adjustable.
The bounce part needs to be a linear keyframe and the zenith of the actual bounce needs to be an ease in/out. I will animate the position X by hand – possibly with a null, if the expression does not alow the layer to have its position keyframed.
So basically, like a karaoke ball standing in place.
Make sense?
Thanks.
Aharon
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Aharon Rabinowitz
arabinowitz(AT)yahoo(DOT)com
http://www.allbetsareoff.com—————————————-
Click the link below to subscribe to the Creative Cow After Effects Podcast, and get free AE video tutorials:https://phobos.apple.com/WebObjects/MZStore.woa/wa/viewPodcast?id=111087911
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3 Replies
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Aharon,
If you keyframe one cycle of the bounce with three keyframes, add a slider to set the bounce period and another for the bounce start time, something like this should work:
period = effect(“period”)(“Slider”);
bounceStart = effect(“start”)(“Slider”);t = ((time – bounceStart)%period)/period;
valueAtTime(linear(t, key(1).time, key(3).time))You’ll probably want to reduce the slider ranges to give you finer control.
Dan
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Thanks. I’ll give this a shot.
So my understanding is that the distance between the keyframes doesn’t matter, right? The expression is what controls the actual timing?
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Aharon Rabinowitz
arabinowitz(AT)yahoo(DOT)com
http://www.allbetsareoff.com—————————————-
Click the link below to subscribe to the Creative Cow After Effects Podcast, and get free AE video tutorials:https://phobos.apple.com/WebObjects/MZStore.woa/wa/viewPodcast?id=111087911
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Yup, that’s how it should work.
Dan
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