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Keyframe triggers a fade out
Hey all,
I know this is a simple one but I just cant get it to work.
Id like to have the opacity to instantly jump up to 100% when an (unrelated) keyframe on a slider is met, then fade out over 20f. If another keyframe happens to interrupt this fadeout then it should still do the same thing, jump up to 100% and fade out. (over and over again). So the resting opacity should be 0% until keyframes are met, sort of like a flashbulb effect when keyframes are met.
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5 Replies
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This should work:
fadeTime = framesToTime(20);
s = effect("Slider Control")("Slider");
if (s.numKeys > 0){
n = s.nearestKey(time).index;
if (time < s.key(n).time) n--;
if (n > 0)
linear(time - s.key(n).time,0,fadeTime,100,0)
else
0;
}else
0
Dan
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Perfection as usual Dan!
Greatly appreciated. -
Greatly appreciated!
How could I go about adding 2 variables to this:
A delay time – so instead of triggering on the exact frame, it happens a few frames before or after the keyframe is met.
A fade in duration – so it can take more than 1 frame to go from 0 to 100% opacity.
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Maybe like this:
fadeInTime = framesToTime(5);
fadeOutTime = framesToTime(15);
delay = framesToTime(3);s = effect("Slider Control")("Slider");
if (s.numKeys > 0){
n = s.nearestKey(time).index;
if (time < s.key(n).time) n--;
if (n > 0){
t = time - s.key(n).time - delay;
if (t < fadeInTime)
linear(t,0,fadeInTime,0,100)
else
linear(t,fadeInTime,fadeInTime+fadeOutTime,100,0);
}else{
0;
}
}else
0
Dan
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Very cool!
I have found an issue though.If I set the delay to a negative number so as to advance the flash effect, it cuts off the fadein effect.
So a delay of -15 together with a fade of 15 results in the fade being completely cut off!
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