How to change the amount of influence or amount of ease on easeOut interpolation expression

[Dan Ebberts]

You can’t control the influence directly, but you can compound the ease, like this:


if (numKeys > 1){
t1 = key(1).time;
t2 = key(2).time;
v1 = 99;
v2 = thisComp.layer("CONTROLLER").effect("COUNT_DOWN_NUMBER")("Slider");
t = easeOut(time,t1,t2,0,1);
easeOut(t,0,1,v1,v2);
}else
value


Alternatively, you could implement one of the Penner ease functions.

Dan

[Keith Endow]

Thank you Dan!

Would you know where I can read up more on how to implement Penner’s functions in this situation?

[Dan Ebberts]

There’s a lot of info out there. This is one source:

https://gizma.com/easing/

There are also some links here:

https://robertpenner.com/easing/

If you have Ease and Wizz, you can look at what it does.

Dan

[Keith Endow]

Just downloaded and loaded Ease and Wizz. What an awesome script!

So now that I’m looking at the code, is there any way to have a slider control change the values of the keyframes?

SliderPoint = thisComp.layer("CONTROLLER").effect("BLACK_BOX_LENGTH")("Slider");

// Ease and Wizz 2.5.2 : outExpo : All keyframes
// Ian Haigh (https://aescripts.com/ease-and-wizz/)
// Last built: 2017-01-09T15:35:09+11:00

function easeandwizz_outExpo(t, b, c, d) {
var OUT_EXPO_CORRECTION = 1.000976;
return (t==d) ? b+c : c * OUT_EXPO_CORRECTION * (-Math.pow(2, -10 * t/(d)) + 1) + b;
}

function easeAndWizz() {
var n = 0;
if (numKeys > 0) {
n = nearestKey(time).index;
if (key(n).time > time) { n-- }
}

try {
var key1 = key(n);
var key2 = key(n+1);
} catch(e) {
return null;
}

// determine how many dimensions the keyframes need
var dim = 1; // It's gotta have at least ONE dimension
try {
key(1)[1];
dim = 2;
key(1)[2];
dim = 3;
} catch(e) {}

t = time - key1.time;
d = key2.time - key1.time;

sX = key1[0];
eX = key2[0] - key1[0];

if (dim >= 2) {
sY = key1[1];
eY = key2[1] - key1[1];

if (dim >= 3) {
sZ = key1[2];
eZ = key2[2] - key1[2];
}
}

if ((time < key1.time) || (time > key2.time)) {
return value;
} else {
val1 = easeandwizz_outExpo(t, sX, eX, d);
switch (dim) {
case 1:
return val1;
break;
case 2:
val2 = easeandwizz_outExpo(t, sY, eY, d);
return [val1, val2];
break;
case 3:
val2 = easeandwizz_outExpo(t, sY, eY, d);
val3 = easeandwizz_outExpo(t, sZ, eZ, d);
return [val1, val2, val3];
break;
default:
return null;
}
}
}

(easeAndWizz() || value);


[Dan Ebberts]

I guess you’d have to get in there and swap out the sX, sY, sz, eX, eY, and eZ values. It might be easier to build your own based on the formula in the first function.

Dan