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Fade In/Out Expression Problems
Hi,
I’m using an expression (provided by Roland R. Kahlenberg) to control a Pre-Composed group of layers. The expression he provided currently fades in the first layer over 5 seconds, and then offsets each subsequent layer by 3 seconds, and then fades in over 5 seconds as well. This expression works perfectly, but theres a couple of things more I was hoping to add to it.First, if possible, it would be incredible if after all the layers fade in, to wait 5 seconds and then fade out all layers at once over a period of 5 seconds.
Second, to have the expression start at the In Point of each layer, and when the fade out happens, to create an Out Point for each layer in the Pre-Comp.Thanks
duration = 5;
offset = 3;
indexScalar = offset*(index-1);
linear(time,indexScalar,indexScalar+duration,0,100) -
4 Replies
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This should do it. Auto fade in at layer inpoint and auto fade out at outpoint. It’s going by frames though so multiply your frame rate by 5 for the “fadeTime” variable if you want 5 seconds. So if your frame rate is 30fps, change fade time to 150.
fadeTime = 15;
opacityMin = 0;
opacityMax = 100;
layerDuration = outPoint - inPoint;
singleFrame = thisComp.frameDuration;animateIn = linear(time, inPoint, (inPoint + framesToTime(fadeTime)), opacityMin, opacityMax);
animateOut = linear(time, (outPoint - framesToTime(fadeTime+1)), (outPoint-singleFrame), opacityMax, opacityMin);if(time < (layerDuration/2)){animateIn;}else{animateOut;}
“|_ (°_0) _|”
Sincerely,
George
http://www.vimeo.com/georgegoodman
http://www.linkedin.com/in/georgefranklingoodman -
just to make sure i know what you’re asking…
you want each layer to be 15 seconds with a 5 second fade-in, 5 seconds at 100% and then 5 seconds to fade out. you still want to keep the 3 second offset between layers and you’d like to have the fade start at the inpoint and the after the fade out to set an outpoint.
first off, expressions can’t set in or out points, so if you go this route, you’ll need to use a different method to create the offset (animation>keyframe assistant>sequence layers can do this, so that’s not a big deal).
so the first thing you’ll want to do is make all the layers the same length. if they currently all start at the first keyframe of the comp, simply select all the layers, go 15 seconds down the timeline and then hit alt-] or option-] (right-bracket key) to trim them all to the same length.
then with the layers still selected, choose animation>keyframe assistant>sequence layers and choose the option for overlap and enter the duration of the overlap, which if i understand what you want would be 13 seconds. note that the order in which you select the layers determines the order that the layers will be sequenced, first layer selected will be first in the timeline.
then for the opacity expression you want something like this:
duration = 5;
if (time>=inPoint && timeKevin Camp
Art Director
KCPQ, KZJO & KRCW -
thank you SO much! That worked exactly like I wanting.
Thanks!Austin Duncan
Duncan. Artwork
austinwayneduncan.com -
Realized I gave you bad advice, sorry. This would work much better.
fadetime = 5animateIn = ease(time, inPoint, inPoint+fadetime, 0, 100);
animateOut = ease(time, (outPoint - fadetime), outPoint, 100, 0);if (time <= inPoint+fadetime) {animateIn} else {animateOut}
“|_ (°_0) _|”
Sincerely,
George
http://www.vimeo.com/georgegoodman
http://www.linkedin.com/in/georgefranklingoodman
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