[Dan Ebberts]

You want the script to build the current value of script variable myCustom into the expression, is that correct? I think that would be like this:

var myExpr = 'temp = thisComp.layer("' + myCustom + '").effect("Drive")("Output 01"); dim = value instanceof Array ? value.length : 1; dim > 1 ? [temp,temp] : temp';

[Dan Ebberts]

You probably just need to adjust a couple of lines:

minPeriod = 0.1;
maxPeriod = 0.6;
minVal = 0;
maxVal = 10;
accum = accumPrev = 100;
t = tPrev = 0;
seedRandom(index,true);
while(t <= time){
  tPrev = t;
  accumPrev = accum;
  accum -= random(minVal,maxVal);
  t += random(minPeriod,maxPeriod);
}
linear(time,tPrev,t,accumPrev,accum)

[Dan Ebberts]

Maybe some variation of this:

minPeriod = 0.1;
maxPeriod = 0.6;
minVal = 0;
maxVal = 10;
accum = accumPrev = 0;
t = tPrev = 0;
seedRandom(index,true);
while(t <= time){
  tPrev = t;
  accumPrev = accum;
  accum += random(minVal,maxVal);
  t += random(minPeriod,maxPeriod);
}
linear(time,tPrev,t,accumPrev,accum)

[Dan Ebberts]

I think so. The pick whip knows what property you’re pointing at, and thisProperty knows which property you’re referring to, but an expression referring to another property needs to be told which property. I think that’s what you’re saying.

[Dan Ebberts]

You could use sampleImage() to get the luminance of a section of the LED wall with something like this:

L = thisComp.layer("LED Wall");
s = L.sampleImage([L.width,L.height]/2,[100,100]);
rgbToHsl(s)[2]*100

[Dan Ebberts]

Sorry, I don’t get it. You could do something like:

thisComp.layer("Medium Red Solid 3").effect("CC Particle World")(17).name

and get the same result, but I suspect that’s not what you’re after…

[Dan Ebberts]

I’m confused. If you want to reference the property name with an expression on another layer/property, why wouldn’t you just use the pickwhip, add .name, and end up with what you have in your example? Sorry, I’m missing something…

[Dan Ebberts]

That’s correct, I think it just affects the transparency of thumbnails in the project panel.

[Dan Ebberts]

It doesn’t really do anything and calls itself endlessly. Maybe you meant this:

function turnTransparency(){
	app.project.transparencyGridThumbnails = true;
}

[Dan Ebberts]

Like this:

easeTime = 1;
sy = effect("Slider Control")("Slider");
m = marker;
y = 0;
if (m.numKeys > 0){
  n = m.nearestKey(time).index;
  if (time > m.key(n).time) n++;
  for (i = 1; i <= n-1; i++){
    y += sy.valueAtTime(m.key(i).time);
  }
  if (n <= m.numKeys){
    t = m.key(n).time - time;
    y += ease(t,0,easeTime,sy.valueAtTime(m.key(n).time),0);
  }
}
value + [0,y]