loopOut expression question

[Dan Ebberts]

No, you can’t use loopOut() on paths. You can create your own though. Here are “roll your own” ping pong and cycle variations:


// ping pong loopOut()

if (numKeys > 1 && time > key(numKeys).time){
t1 = key(1).time;
t2 = key(numKeys).time;
span = t2 - t1;
delta = time - t2;
seg = Math.floor(delta/span);
t = delta%span;
valueAtTime((seg%2) ? (t1 + t) : (t2 - t));
}else
value

// cycle loopOut()

if (numKeys > 1 && time > key(numKeys).time){
t1 = key(1).time;
t2 = key(numKeys).time;
span = t2 - t1;
delta = time - t2;
seg = Math.floor(delta/span);
t = delta%span;
valueAtTime(t1 + t);
}else
value

Dan

[Patrick Birks]

Thanks Dan! I guess i’ve got a few questions now. Where can I go to figure out what that means because I have no idea what that is. Two how can that be changed so the loops happens later in the time line. For example I have a pulse of light that goes down a track it starts at 4 sec in last for 20 frames, how can i get it to not loop till another 4 seconds later. Hopefully that makes sense.

[Dan Ebberts]

I’m not sure if this will do what you want, but this modification will loop the number of keyframes specified by variable n:


n = 2;
if (numKeys >= n && time > key(numKeys).time){
t1 = key(numKeys-n+1).time;
t2 = key(numKeys).time;
span = t2 - t1;
delta = time - t2;
seg = Math.floor(delta/span);
t = delta%span;
valueAtTime(t1 + t);
}else
value


The way I have it set up here, it will only loop the last two keyframes. Does that help?

Dan