Expression count up values in specific time

[Dan Ebberts]

The key to making something like this work is that your expression has to be able to figure out when the slider changed to a particular value. Do you have a keyframe for each slider value? If so, it’s fairly straighforward. If not, it’s more cumbersome, but it can still be done. So how are you driving the slider values, exactly?

Dan

[Hung Nguyendac]

Hi Dan.
Yes. I have 1 Slider and about 30 Toggle Hold Keyframe on it.
Each keyframe will get the value from csv file to Source Text.
Currently, when I key Silder’s value from 50->51. The source text will change (500->1000) Immediately in 1 frame when the Slider’s value = 51.
I’m looking for is it possible to make it change (500 count up to 1000) In 30 frames (1s) After each new keyframe of slider?

[Dan Ebberts]

It seems like the value of the slider doesn’t matter, just the index of the most recent keyframe. It will probably looks something like this:


s = comp("MainComp").layer("Value Control").effect("Value 1")("Slider");
v = value;
if (s.numKeys > 0){
n = s.nearestKey(time).index;
if (time < s.key(n).time) n--;
if (n > 0){
if (n ==1){
v = footage("Values.csv").dataValue([2,0]);
}else{
t = time - s.key(n).time;
v1 = footage("Values.csv").dataValue([2,n-2]);
v2 = footage("Values.csv").dataValue([2,n-1]);
v = linear(t,0,1,v1,v2);
}
}
}
v


Dan

[Hung Nguyendac]

Thanks a lot for your help Dan. I tried it and seem like expressions can not execute what i’m thinking, i’ll continue with old expression. Hope you are staying safe in the pandemic ????

[Hung Nguyendac]

Hi Dan. I’m facing a problem.
Text 1. Source Text: It’s simple and working fine.
x=thisComp.layer("Null 1").effect("Slider")("1");
if (x==1) "Name 1" else if(x==2) "Name 2" else "Name 3"

Text 2 . Source Text: The problem in line 3.
n=Math.round(thisComp.layer("Text 1").text.sourceText)+".csv";
x=Math.round(comp("MainComp").layer("Null 2").effect("Slider")("Slider"));
if(x==50) footage(n).dataValue([2,0]) else value

When i key Null 1 change from “Name 1” -> “Name 2”. But Text 2 can’t get “Name 2.csv” to n, After Effects shows error couldn’t find footage named NaN.csv.
I’m trying to add “” to n by this if(x==50) footage((")+n+(")).dataValue([2,0]) else value. it’s wrong.
Is there any way to make it work?

[Hung Nguyendac]

Hi Dan. I’m facing a problem.
Text 1. Source Text: It’s simple and working fine.
x=thisComp.layer(“Null 1”).effect(“Slider”)(“1”);
if (x==1) “Name 1” else if(x==2) “Name 2” else “Name 3”

Text 2 . Source Text: The problem in line 3.
n=Math.round(thisComp.layer(“Text 1″).text.sourceText)+”.csv”;
x=Math.round(comp(“MainComp”).layer(“Null 2”).effect(“Slider”)(“Slider”));
if(x==50) footage(n).dataValue([2,0]) else value

When i key Null 1 change from “Name 1” -> “Name 2”. But Text 2 can’t get “Name 2.csv” to n, After Effects shows error couldn’t find footage named NaN.csv.
I’m trying to add “” to n by this
if(x==50) footage((")+n+(")).dataValue([2,0]) else value . it’s wrong.
Is there any way to make it work?