Is it possible to limit specific expressions in keyframes?

I am really a beginner when it comes to expressions.

I currently use an expression of "bounce" on the position of some objects that arrive on the screen setting. However, the next time they change positions, I don't want them to bounce. Whenever a motion tween ends in a static position, the expression of the position to be applied and things will move.

I want to keyframe the expression so that it worked only when she's on key images that it makes sense to assign.

amp =. 05;

FREQ = 1;

cavity = 7;


n = 0;

If (Numkeys > 0)

{

n = .index nearestKey (time);

If (key (n) .time > time)

{

n-- ;

}

}



If (n == 0)

{

t = 0;

}

on the other

{

t = time - .time key (n);

}



If (n > 0)

{

v = velocityAtTime (key (n) .time - thisComp.frameDuration/10);

value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);

}

on the other

{

value

}

I got this script somewhere online. The only thing I know how to manipulate are the initial values of the GPA, freq, and decay.

This version will bounce only to the 2nd keyframe:

amp =. 05;

FREQ = 1;

cavity = 7;

KF = 2; only on the 2nd keyframe

n = 0;

If (Numkeys > 0) {}

n = .index nearestKey (time);

If (key (n) .time > time) n -;

}

If (n == kf) {}

t = time - .time key (n);

v = velocityAtTime (key (n) .time - thisComp.frameDuration/10);

value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);

} else

value

Dan

Tags: After Effects

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