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How to link a keyframe to a slider control
Hey all,
I want to do something fairly simple:
Got 2 keyframes on the opacity of a layer
The first keyframe has a value of 0
The second keyframe has a value of 0Now I want to be able to control the second keyframe with a slider control. So when the slider value is 50, the keyframe value is 50 (so the animation will be from 0 to 50). is there a keyframe index that I can use to link it up with a slider control? and in a way where I can simply change the slider and everything will update without issues?
I’ve found expression that does the trick, but they seem way too complex for my situation and I have no idea what’s going on here:
keyNumToChange = 3; //change this - the key num to change (numbering starts at 1)
newVal = [1500, 460]; //change this - the new position.
//-------
nearKey = thisLayer.position.nearestKey(time).index;
lastKey = (thisLayer.position.key(nearKey).time>time) ? ((nearKey>1) ? nearKey-1 : nearKey) : nearKey;
nextKey = (lastKeyI would love to understand how this expression works, but primairly I'd like to know to write something a little more simplified (if possible) and how it exactly works.
Thanks in advance
Regards,
Ramon Peppelenbos
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5 Replies
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I think an opacity expression like this would do the trick:
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
Dan
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Thanks a lot, does the trick. Could you perhaps explain how this exactly works?
Not familiar with numKeys, key().time and how linear() works in combo with that. Or perhaps you got some resource I can read to fully understand what’s happening
I’ve also noticed there is no real way to easy eaze, has that something to do with linear?
Regards,
Ramon
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It would be great if you can explain same expression for Position, rotation and scale. You are Great !
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Hi there! It’s really helpful! Is it possible to add to this script a inertial bounce? I tried to combine two scenarios, but this was unsuccessful.
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
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Amazing and very helpful for me.. Thank you so much !
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