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Activity Forums Adobe After Effects Expressions Adding Overshoot expression to Scale expression

• # Adding Overshoot expression to Scale expression

Posted by on March 4, 2023 at 1:36 am

Hello, please, is there any way I could add this overshoot expression above to my scale expression below

try {

amp = effect(“Scale – Overshoot”)(“ADBE Slider Control-0001”) / 2.5, freq = effect(“Scale – Bounce”)(“ADBE Slider Control-0001”) / 20, decay = effect(“Scale – Friction”)(“ADBE Slider Control-0001”) / 20, n = 0, 0 < numKeys && (n = nearestKey(time)

.index, key(n)

.time > time && n–), t = 0 === n ? 0 : time – key(n)

.time, 0 < n ? (v = velocityAtTime(key(n)

.time – thisComp.frameDuration / 10), value + v / 100 * amp * Math.sin(freq * t * 2 * Math.PI) / Math.exp(decay * t)) : value;

} catch (e\$\$4) {

value = value;

}

Scale Expression

function easeInOutCubic(t, tMin, tMax, value1, value2){

b = value1;

c = value2-b;

d = tMax-tMin;

t = tMin < tMax ? thisLayer.linear(t,tMin,tMax,0,d) : thisLayer.linear(t,tMin,tMax,d,0);

t /= d/2;

if (t <1) return c/2*Math.pow(t,3) + b;

t -= 2;

return c/2*(Math.pow(t,3) + 2) + b;

}

duration = .47;

start=[0,0,0];

destination = [100,100,100];

exit = [0,0,-0];

middle = (inPoint+outPoint)/2;

v = time < middle ? easeInOutCubic(time,inPoint,inPoint+duration,start,destination) : easeInOutCubic(time,outPoint-duration,outPoint,destination,exit);

Thank you

Regards,

Obed

2 Members · 8 Replies
• 8 Replies
• ### Dan Ebberts

March 4, 2023 at 1:44 am

I don’t think it will work, because your easeInOut expression has zero velocity at the end of the ease, and overshoot depends on incoming velocity.

• ### Obed Ampong

March 4, 2023 at 1:50 am

Hi Dan,

Ok. Please is there any way I could add it to the inPoint only?

Regards,

Obed

• ### Dan Ebberts

March 4, 2023 at 3:07 am

I’m not sure I understand what you mean, but an easeInOut has zero velocity at both ends, so I’m guessing no.

• ### Obed Ampong

March 4, 2023 at 3:33 am

Please, I am trying to scale from 0 to 100 instead of keyframe, then overshoot and maintain 100 until layer outPoint goes back to 0.

• ### Dan Ebberts

March 4, 2023 at 4:59 am
• ### Obed Ampong

March 4, 2023 at 1:24 pm

Ok, Dan.

Thank you.

Regards,

Obed

• ### Obed Ampong

March 7, 2023 at 3:51 pm

Hello Dan,

I tried modifying your scalar bounce expression by adding outPoint to it, where the outPoint and the inPoint have the same value. However, the overshoot failed to work. Is there any possible way to do this? Thank you. :

freq = 3;

decay = 5;

t = time – inPoint;

startVal = [0,0];

exit =[0,0]

endVal = [effect(“Slider Control”)(“Slider”),effect(“Slider Control”)(“Slider”)];

dur = 0.1;

if (t < dur){

linear(t,0,dur,startVal,endVal);

}else{

amp = (endVal – startVal)/dur;

w = freq*Math.PI*2;

endVal + amp*(Math.sin((t-dur)*w)/Math.exp(decay*(t-dur))/w);

}

middle = (inPoint+outPoint)/2;

v = time < middle ? easeIn(time,inPoint,inPoint+dur,startVal,endVal) : easeOut(time,outPoint-dur,outPoint,endVal,exit);

v

Regards,

Obed

• ### Dan Ebberts

March 7, 2023 at 10:04 pm

What is it exactly that you want to happen? It’s not clear to mean from what you’ve described so far…

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