loopOut on keyframes AND modifying them with the linear() expression

[Dan Ebberts]

I think that would be like this:

first = key(2).value;
second = key(3).value;
newValue = effect("Length 25-80")("Slider");
d = key(numKeys).time - key(1).time;
if (time < key(1).time){
  t = key(numKeys).time - (key(1).time - time)%d;
}else if (time > key(numKeys).time){
  t = key(1).time + (time - key(numKeys).time)%d;
}else{
  t = time;
}
linear(valueAtTime(t), first, second, first, newValue);

[Patrick Grossien]

It works like a charm! Thank you so, so much, Dan!

[Brie Clayton]

Thanks for this solve, Dan!

[Patrick Grossien]

If I may follow up on this, could you – or someone else who can – explain to me the modulo operation? I still am not sure if I can wrap my head around it.

t = time%key(numKeys).time;

Let me try though:

– take the duration spanning all keyframes of the current property:

key(numKeys).time

– let “t” loop from 0 to x in time increments every time the above keyframe duration fitted into “time”.

So if I have keyframes ranging over 2 seconds, at 2:01 “t” will start to count from 0 to 2 in the same way as “time” would and do that over and over again.

Is this correct? At least that would make sense to me, I guess 😂

[Dan Ebberts]

That’s pretty much it. I used that simple form in the first expression because I was assuming that the first keyframe was at time = zero. If that isn’t the case, you have to use the more complex form that involves the times of both the first and last keyframes.

[Patrick Grossien]

That was perfect and totally what I intended in the beginning. The extending both ways part came later when I realized it could be extremely practical.

Thank you so so much for all your help – past, present and future 🙂