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Making a null toggle another layer's opacity… With a fade
Hi,
I have a few specific “states” needed in my composition, and I’m using a Slider control on a Null to toggle those states.
A slider value of “1” toggles the opacity of layers A, B and C to 100, the others to 0.
A slider value of “2” toggles the opacity of layers D, E and F to 100, the others to 0.
A slider value of “3” toggles the opacity of layers G, H and I to 100, the others to 0.I’m using keyframes on the Null to change the slider value between 1, 2 and 3 depending on which set of layers I need to be at full opacity.
However I would like for the change happening at each toggle to be eased over 1 second, rather than happen abruptly.
I feel I am close with this expression (added to each layer’s opacity), however using ‘time’ doesn’t quite cut it because, I believe, as the expression is constantly recalculated, the fade is restarted at every frame.
starttime = time;
endtime = starttime + 1;
if(thisComp.layer("Null").effect("Slider Control")("Slider") ==1) {easeOut(time,starttime,endtime,0,100)} else {(time,starttime,endtime,100,0)};
Many thanks.
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2 Replies
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If I understand what you’re after, it’s a little more complex. This doesn’t account for all possibilities, but it should get you pretty close (update myNum for each group):
myNum = 1;
easeTime = 1;
s = thisComp.layer("Null").effect("Slider Control")("Slider");
if (s.numKeys > 1){
n = s.nearestKey(time).index;
if (time < s.key(n).time) n--;
if (n > 0){
if (s.key(n).value == myNum){
ease(time,s.key(n).time,s.key(n).time+easeTime,0,100);
}else{
if (n > 1){
if (s.key(n-1).value == myNum){
ease(time,s.key(n).time,s.key(n).time+easeTime,100,0);
}else{
0;
}
}else{
0;
}
}
}else{
0;
}
}else
s.value == myNum ? 100 : 0
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That’s… Exactly what I’m after.
Dan, thank you so much for your time and effort — it’s much appreciated.
Have a great day.
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