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Keyframe Overshoot with no oscillation
I’d like to create an expression similar to your Keyframe Overshoot example except I’d like the object to overshoot the position and ease into a stop with no oscillation. Possible variables could be mass and friction to control the ease to stop motion.
Thanks.
freq = 3;
decay = 5;n = 0;
if (numKeys > 0){
n = nearestKey(time).index;
if (key(n).time > time) n--;
}
if (n > 0){
t = time - key(n).time;
amp = velocityAtTime(key(n).time - .001);
w = freq*Math.PI*2;
value + amp*Math.sin((t)*w)/Math.exp(decay*(t))/w;
}else
value -
3 Replies
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You should be able to get rid of the oscillation by bumping up the damping (decay). Try freq = 1 and decay = 15 and see if that gets you closer.
Dan
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I keep getting this error with the expression when I change the freq and decay values.
invalid numeric result (divide by zero?)
Error occuredat line 13
Property: ‘Position’I tried your suggested values and the position always returns to the last keyframed value. I’m looking to go past the keyframe and ease to a stop based on velocity and a friction variable.
Thanks.
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It would help if you would paste in the expression that’s generating the error.
Dan
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