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valueAtTime in both directions
Hi folks,
let’s say I have a keyframed animation that goes from 0 to -500 in Z space and back to 0 again and a layer that references that with valueAtTime and a -.1 delay.
I want the delay to adapt to the change of direction, which works with this code:
src=thisComp.layer(index-1)
v=src.transform.position.velocity;
let delay;
if(v[2] >= 0) {delay = -.1} else {delay = .1};
src.transform.position.valueAtTime(time-delay);
Unfortunately, this generates two problems:
- On the first frame of the animation, which starts in the beginning of the comp, the position value jumps to -107.8, while it should be 0 since the animation it references is at 0 as well.
- One frame before the -500 keyframe and the direction switch, the delayed layers jump values, which makes it look choppy like a few frames have been skipped, due to the nature of the adaptive delay, which switches values abruptly.
This code fixes the first problem:
const src=thisComp.layer(index-1);
const v = src.transform.position.velocity;
let delay;
if (time == 0){
[value[0],value[1],value[2]];
}else{
(v[2] >= 0) ? delay = -.1 : delay = .1;
src.transform.position.valueAtTime(time-delay);
};
…but the other persists.
Any help would be fantastic 🙂
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3 Replies
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Update: cranking up the easing to 100 on the -500 keyframe fixed the problem…
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see if this helps too
const src = thisComp.layer(index-1);
const v = src.transform.position.velocity;
let delay;
if (time == 0) {
// Set the position to the initial value at time 0
[value[0], value[1], value[2]];
} else {
// Check if the velocity is greater than or equal to 0
if (v[2] >= 0) {
// If the velocity is positive, check if the previous delay value was negative
if (delay < 0) {
// If the previous delay was negative, interpolate between the previous value and -0.1 to smooth out the transition
delay = linear(time, time-thisComp.frameDuration, time, delay, -0.1);
} else {
// If the previous delay was not negative, set the delay to -0.1
delay = -0.1;
}
} else {
// If the velocity is negative, check if the previous delay value was positive
if (delay > 0) {
// If the previous delay was positive, interpolate between the previous value and 0.1 to smooth out the transition
delay = linear(time, time-thisComp.frameDuration, time, delay, 0.1);
} else {
// If the previous delay was not positive, set the delay to 0.1
delay = 0.1;
}
}
// Use the calculated delay value to get the position value at the current time
src.transform.position.valueAtTime(time - delay);
}
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Max, you nailed it! Thanks for the proper education 😉
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