Position value as target of automatized movements

[Dan Ebberts]

I see a couple of things. This line:

if (CurrentKeyframe.index = 1) {

needs to be like this:

if (CurrentKeyframe.index == 1) {

Also, your code doesn’t quite work if there are no keyframes (or only one keyframe) or if the first keyframe might be later than time = 0. I think something like this should work for what you’re trying to do:

val = value;
if (numKeys > 1){
  n = nearestKey(time).index;
  if (time < key(n).time) n--;
  if (n == 1){
    t1 = key(1).time;
    t2 = key(2).time;
    v1 = key(1).value;
    v2 = key(2).value;
    val = ease(time,t1,t2,v1,v2);
  }
}
val

[Marco Tabilio]

Thank you very much for your answer, it is an honour to have a conversation with you.

However I think I didn’t explain myself clearly.

The idea is that my object stands still until the time reaches a keyframe’s time minus a certain duration.

Let’s say, duration = 1 second.

So at every keyframe’s time minus 1 second the movement begins; the object starts moving from his current position (which is the previous keyframe’s position OR the initial position, if there are no previous keyframes).

The movement terminates when the time reaches the keyframe’s time and the object reaches its position value.

Then the object stands in its new position until the time reaches the following keyframe’s time minus the duration… and so on.

This should happen at every keyframe.

Basically I’d like to determine only the final positions of the movements of an object, because all the movements I want are equal (same duration, same easing). In other words, I’d like to move my object setting only one keyframe (the end position), not two (beginning and end position).

Thanks again for your help.

Marco

[Dan Ebberts]

Something like this maybe:

dur = 1.0;
val = value;
if (numKeys > 0){
  n = nearestKey(time).index;
  if (time > key(n).time) n++;
  if (n <= numKeys){
    v1 = n == 1 ? valueAtTime(0) : key(n-1).value;
    v2 = key(n).value;
    t1 = key(n).time-dur;
    t2 = key(n).time;
    val = ease(time,t1,t2,v1,v2);
  }else{
    val = key(numKeys).value;
  }
}
val

[Marco Tabilio]

Thank you very much, this works perfectly! 🙂