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Analog clock with inertial bounce on second hand
Hi everyone,
I’ve got an analog clock with an expression to make the seconds hand ‘tick’ every second. I’d like to add an inertial bounce to the motion of the seconds hand, but can’t seem to make any of the bounce expressions on the web work with a property that’s being driven by expressions rather than keyframes.
Any idea how I might be able to give the seconds hands a little bounce every time it ticks without having to keyframe the ticking of the seconds hand itself?
Thanks!
wholeSecond = Math.floor(time);
rotateDuration = 0.05;
anglePerSecond = 6; // 360 / 60
startAngle = wholeSecond * anglePerSecond;
linear(time, wholeSecond + 0.95, wholeSecond + 1, startAngle, startAngle + anglePerSecond); -
3 Replies
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I did a similar thing on the clock hand of my VTClock tutorial. The expression below is the rotation control for the second hand. The second hand only moves on the whole second, but overshoots by a small amount, then one frame later, goes back to where it’s supposed to be. I converted time to frames to control this. Note that you may need to change the statements to suit your own frame rate:
ttf=timeToFrames(t = time + thisComp.displayStartTime, fps = 1.0 / thisComp.frameDuration, isDuration = false);
compFrameRate=25;
angle=Math.floor(ttf/compFrameRate)*6;
if (ttf % compFrameRate == 0) {
angle+=.5;
} else if (ttf % compFrameRate ==1) {
angle-=.5;
}
Declan Smith
https://www.madpanic.tv
After Effects CS6/ FCS3 / Canon XLH1 / Canon 7D / Reason / Cubase“it’s either binary or it’s not”
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Thanks for this, I was struggling to figure this out.
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Hey Declan, I love this expression, but is there a way to have it start at the layer in point and stop at the layer out point? I’m having a tough time with a particular comp that has a lot of expressions and splitting layers just screws things up.
Jason Jantzen
vimeo.com/jasonj
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