How to control a layer in-point and out-point animation with time remapping slider

[Sebastien Bruzzo]

I’ve find this nice expression from Kevin Camp, but it’s designed to read the animation forward and backward.

t = thisComp.frameDuration*15;
if (time-inPoint <= t) time-inPoint;
else if (time >= outPoint-t) outPoint-time;
else t;

In my case I’d like almost the same, except the layer’s outpoint (minus the duration of the outgoing animation) plays forward.
Not sure I make myself clear :))

[Sebastien Bruzzo]

And I’ve found a few minutes ago this expression that almost perfectly does what I want :

//On the time remap property
L = thisLayer;
t = time;
animLength = 10;
animLength *= thisComp.frameDuration;
LDur = L.outPoint-L.inPoint;
MidDur = LDur - animLength*2;
if( t>=L.inPoint && t<= L.inPoint+animLength) {t-L.inPoint}
else if( t>L.inPoint+animLength && t<L.outPoint-animLength) {animLength + (t-L.inPoint+animLength)/MidDur)*(L.source.duration-animLength*2)}
else if(t>=L.outPoint-animLength && t<=L.outPoint) {t-(L.outPoint-animLength)}
else 0;

It plays the first 10 frames of the animation at the layer’s inpoint, then stretches the in-between frames, and plays the last part of the animation 10 frames before the layer’s outpoint.

I can use this expression, but I would like to know if it could be improved in order to freeze the animation in the middle.

Thanks !

[Roy Huetink]

Hi Sebastien,

I am getting an error on line 9 if I try this expression (Expected: ;.). Do you know what is going wrong?

Thanks,
Roy

[Roy Huetink]

I’ve found another expression which works for me:

L = thisLayer;
Src = L.source;
SrcDur = Src.duration;
LDur = L.outPoint-L.inPoint;
SrcInDur = framesToTime(28); //the duration of the in animation
SrcOutDur = framesToTime(34); //the duration of the out animation
SrcLoopDur = SrcDur-SrcInDur-SrcOutDur;

if(time < L.inPoint+ SrcInDur) {
tSampleT = time-L.inPoint;
} else if(time > L.outPoint-SrcOutDur) {
LOutElapsed = time - (L.outPoint-SrcOutDur);
tSampleT = SrcDur-SrcOutDur + LOutElapsed;
} else {
tSampleT = SrcInDur+Src.frameDuration;
}