[Dan Ebberts]

Assuming you’re applying this to a text layer’s source text, I think this does what you want:

Speed = 20;
t = time < (inPoint+outPoint)/2 ? time - inPoint : outPoint - time;
value.substr(0,t*Speed)

[Dan Ebberts]

noise() is a 3D Perlin noise field that accepts a number or a 2 or 3 item array as its input. So you could do something like this:

noiseMulti = 10;
fr = 10;
amp = 200
seed = 1268;
n = noise([time*fr,seed])*amp*noiseMulti;
[0,n]

[Dan Ebberts]

This would animate between the keyframes, except for the last one, where it would use your previous timing:

m = text.sourceText;
if (m.numKeys > 0){
  n = m.nearestKey(time).index;
  if (m.key(n).time > time) n--;
}
if (n > 0){
  t1 = m.key(n).time;
  if (n < m.numKeys){
    t2 = m.key(n+1).time;
  }else{
    t2 = t1 + .5;
  }
  ease (time,t1,t2,0,100);
}else
  0

[Dan Ebberts]

I think that would actually be a little simpler (if I’m understanding what you’re describing), like this:

L = thisComp.layer("Difference Matte Layer");
count = 0;
f = timeToFrames(time);
for (i = 0; i <= f; i++){
  s = L.sampleImage([L.width,L.height]/2,[L.width,L.height]/2,true,framesToTime(i));
  if ((s[0]+s[1]+s[2]) > 0) count++;
}
count

[Dan Ebberts]

I don’t know how practical it is (because it uses sampleImage(), which can bring your system to its knees), but this should start a counter (which you could use to drive a triggered action) whenever it detects something in your Difference Matte layer:

L = thisComp.layer("Difference Matte Layer");
tRun = 0;
s = L.sampleImage([L.width,L.height]/2,[L.width,L.height]/2);
trig =  (s[0]+s[1]+s[2]) > 0;
t = time - thisComp.frameDuration;
while (t >= 0){
  s = L.sampleImage([L.width,L.height]/2,[L.width,L.height]/2,true,t);
  if (trig){
    if (s[0]+s[1]+s[2] == 0){
      tRun = time - t;
      break;
    }
  }else{
    trig =  (s[0]+s[1]+s[2]) > 0;
  }
  t -= thisComp.frameDuration;
}
tRun

[Dan Ebberts]

Sure, but what should happen at the last marker?

[Dan Ebberts]

So you did change from .value to .text in your myIndex definition and it didn’t help?

[Dan Ebberts]

Depending on what edittext1 is, it might be:

var myIndex = parseInt(edittext1.text,10);

[Dan Ebberts]

That seems like the correct syntax, unless there’s something unusual going on. Maybe you can post a screen shot?

[Dan Ebberts]

The JavaScript engine won’t accept if/else on a single line in that format. I’d do it like this:

a = comp("precomp").layer("title").active ? b : c;