Linking keyframes position X values to slider values

[Dan Ebberts]

There are a lot of variables in something like this and I don’t know that this will work for you, but if you set the slider up as an X offset from the 2nd keyframe, something like this might work for you (and should maintain any easing you have set up on the keyframes):

s = effect("Slider Control")("Slider");
x1 = valueAtTime(key(1).time)[0];
x2 = valueAtTime(key(2).time)[0];
d = x2 - x1;
xCur = value[0] - x1;
x = x1 + (xCur/d)*((x2+s)-x1);
[x,value[1]]

[Daniel Kamhaji]

Hey Dan,

Thanks for your reply!

I’m trying to plug this in and getting an error.

error on line 3: property or method named ‘0’ in class ‘Number’ is missing or does not exist.

I’m supposing this expression would plug in the layer’s Pos X.

I also have a slider effect in the same layer with the default effect name..

Thanks for the help!

I did get a total hack kinda working in case..

I duplicated the layer, and referenced the 2 keys with a variable.. and remapped their values with a linear expression on the duplicated layer…. and those values attached to a slider.

im hoping to get your cleaner version working.

Also for future use,

how would I edit yours above if there are more keys.

im not exactly understanding the lingo(magic) behind it.

Say there was 4 keys and I wanted to attach the slider to anyone of those keys?

Thanks Again!

[Dan Ebberts]

If you have dimensions separated, then it would be like this:

s = effect("Slider Control")("Slider");
x1 = valueAtTime(key(1).time);
x2 = valueAtTime(key(2).time);
d = x2 - x1;
xCur = value - x1;
x1 + (xCur/d)*((x2+s)-x1);

[Daniel Kamhaji]

Thank you so much,

this worked like a charm!