Loop Out Stop expression

[isimson]

I was wondering if it's possible to create a stop/smooth ending to a LoopOut expression on Rotation and Position keyframes.   I am currently using OSX 10.9.3 After Effects CS6 and I have tried a couple of things that haven't worked for me.

adding a checkbox expression control to the layer and an expression for loopOut()

if (effect("Checkbox Control")("Checkbox")==true){

loopOut();

}else{

value;

}

loopOutDuration(“cycle”,2)

Unfortunately neither of these seems to work.  I was wondering if someone had a solution they have come across.

Thanks very much

Ira

[Dan Ebberts]

You could play around with something like this:

cb = effect("Checkbox Control")("Checkbox");

if (cb.value == true)

  t = time%key(numKeys).time

else if (cb.numKeys > 0)

  t = cb.key(cb.numKeys).time%key(numKeys).time

else

  t = 0;

valueAtTime(t)

It assumes your checkbox is keyframed to go from on to off (only once) and will hold the rotation value at that time.

Dan

[isimson]

Thank you Dan,  I apologize for not thanking you sooner.   I also came across this expression which decelerates the loop.

When you paste a path into the Position property, you should get a two-second animation. You can then add a slider and keyframe it to control the speed. A slider value of 1 will keep the loop at 2 seconds, a value of 2 will make it twice as fast, 0.5 half as fast, etc. Then use this expression instead of your loopOut() expression:

spd = effect("Slider Control")("Slider"); n = spd.numKeys; if (n > 0 && spd.key(1).time < time){ accum = spd.key(1).value*(spd.key(1).time - inPoint); for (i = 2; i <= n; i++){ if (spd.key(i).time > time) break; k1 = spd.key(i-1); k2 = spd.key(i); accum += (k1.value + k2.value)*(k2.time - k1.time)/2; } accum += (spd.value + spd.key(i-1).value)*(time - spd.key(i-1).time)/2; }else{ accum = spd.value*(time - inPoint); } if (numKeys > 1){ d = key(numKeys).time - key(1).time; t = (accum - key(1).time)%d; valueAtTime (key(1).time + t); }else value