Link a keyframe to slider control without affecting other keyframes

Question

I'm designing a lower third for one of our brands and have an animated object with 3 keyframes.

I need to link the 3rd keyframe to a slider so my team can eventually adjust that value in Premiere with essential graphics without affecting the other keyframes.

What expression should I use to do this?

I imagine it would look something like this (with better syntax):

if ( key(index) = 3 ) {

key(index).value = effect("Slider Control")("Slider");

}else

key(index).value = value

angie_taylor · Answer

Almost right. You'll need a Linear expression in there to convert values. Here's a solution that will allow you to control the KF between 0 and the slider value, courtesy of the brilliant Dan Ebberts;

if (numKeys > 1){

t1 = key(1).time;

t2 = key(2).time;

v1 = 0;

v2 = effect("Slider Control")("Slider");

linear(time,t1,t2,v1,v2);

}else value

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