expression linear functionc

Question

Hello, I'd like to increase my opacity to 80% and then decrease it from 80% to 0% in the following linear function.

driver=thisComp.layer("Sun").transform.position[0]

SunMin=-180;

SunMax=2076;

SkyMin=0;

SkyMax=80;

if (driver<=2076){

driver=Math.abs(driver)

}

x=linear(driver,SunMin,SunMax,SkyMin,SkyMax);

I think I need to use a condition. I've tried with the x position so that at a certain distance the opacity reverses, but without success :/. Can anyone help me?

Dan Ebberts · Accepted Answer

Ah, that's a little more complex. Maybe like this then:driver = thisComp.layer("Sun").transform.position[0];SunMin=-180;SunMax=2076;SkyMin=0;SkyMax=80;val = SkyMin;x = (driver-SunMin)%(SunMax-SunMin);if (x >= 0){  n = Math.floor((driver-SunMin)/(SunMax-SunMin));  if (n%2) {    val = linear(x,0,SunMax-SunMin,SkyMax,SkyMin);    }else{    val = linear(x,0,SunMax-SunMin,SkyMin,SkyMax);  }}val

Dan Ebberts · Answer

There are a number of ways to do it, but this one is pretty close to what you have:driver = thisComp.layer("Sun").transform.position[0]SunMin=-180;SunMax=2076;SkyMin=0;SkyMax=80;if (driver > SunMax) driver = 2*SunMax - driver;linear(driver,SunMin,SunMax,SkyMin,SkyMax);

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