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Fade In/Out & Opacity Expression

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Jeff Horowitz
Fade In/Out & Opacity Expression
on May 20, 2014 at 5:23:47 pm

So I have two layers:
Layer 1: text
Layer 2: shape layer(text box)

On Layer 2 I've added this expression to its opacity to tell the text box to disappear in the event that there is no text:

thisComp.layer(1).text.sourceText.length>0?75:0

I also want to add this expression to Layer 2 to tell the text box to fade in and out:

fadeInTime = .5;
fadeOutTime = .5;

Math.min(linear(time,inPoint,inPoint + fadeInTime,0,75),linear(time,outPoint - fadeOutTime,outPoint,75,0))

HOW CAN I USE BOTH EXPRESSIONS ON THE OPACITY OF THE SAME LAYER, SO I CAN HAVE THE TEXT BOX FADE IN AND OUT AND ALSO NOT APPEAR WHEN THERE'S NO TEXT?



JAH


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Dan Ebberts
Re: Fade In/Out & Opacity Expression
on May 20, 2014 at 5:37:10 pm

Something like this should work:


fadeInTime = .5;
fadeOutTime = .5;

if (thisComp.layer(1).text.sourceText.length>0){
if (time < (inPoint+outPoint)/2)
linear(time,inPoint,inPoint+fadeInTime,0,75)
else
linear(time,outPoint-fadeOutTime,outPoint,75,0);
}else
0



Dan



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Jeff Horowitz
Re: Fade In/Out & Opacity Expression
on May 20, 2014 at 5:47:40 pm

I'll see if this works and I'll let you know. Thanks for responding so fast.

JAH


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Jeff Horowitz
Re: Fade In/Out & Opacity Expression
on May 20, 2014 at 7:09:15 pm

It worked perfectly, thanks again!

JAH


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Jason Valalik
Re: Fade In/Out & Opacity Expression
on Aug 26, 2014 at 9:38:21 pm

How can I loop this? I get the fade in and out, but I want it to loop on and off throughout.


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Dan Ebberts
Re: Fade In/Out & Opacity Expression
on Aug 26, 2014 at 11:19:43 pm

Something like this maybe:


fadeInTime = .5;
fadeOutTime = .5;
minVal = 0;
maxVal = 75;
if (thisComp.layer(1).text.sourceText.length>0){
t = (time-inPoint)%(fadeInTime+fadeOutTime);
if (t < fadeInTime)
ease(t,0,fadeInTime,minVal,maxVal)
else
ease(t,fadeInTime,fadeInTime+fadeOutTime,maxVal,minVal);
}else
0



Dan



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Jason Valalik
Re: Fade In/Out & Opacity Expression
on Aug 26, 2014 at 11:23:43 pm

yep! That totally worked. Thanks

What about if I wanted to show something like this.

When it fades out have a new piece of text come in. So the user story would be that a customers airplane Gate Changed from say B5 to D10 and I want to have it flash/fade back in forth between the new and old gate?

thanks


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