Blink slider to control the Y position of another layer.

Adobe After Effects Expressions

Blink slider to control the Y position of another layer.

Posted by Roberto Mata on January 22, 2015 at 1:17 pm

Hello,

I’m new to after effects an have some trouble solving this expression I need.
I’m rigging the head of a 2D character. I have set a slider to control the blinks of its eyes.
The slider has three pairs of blink associated with if/else.

From 0 to 10: eyes closed.
From 11 to 20: sibylline eyes.
From 21 to 30: neutral eyes.
Frpm 31 to 40: wide open eyes.

I’ve used this kind of expression:

a=thisComp.layer(“HEAD_CTRL”).effect(“BLINK”)(“Slider”);
if((a>30)&&(a<=40)) 100 else 0

NOW, I want the eyebrows to change their Y position with just one blink mode, the wide open eyes. So I wrote down the Y value for both positions and made an expression for Y position like this:

a=thisComp.layer(“HEAD_CTRL”).effect(“BLINK”)(“Slider”);
if((a>30)&&(a<=40)) 524 else 528

And it worked, but then I needed to parent the eyebrows to the HEAD_CTRL, and when I did OBVIOUSLY the eye brows comp went crazy. I figured out it was because I set some fixed values for Y that wouldn’t work if I changed the HEAD_CTRL position.

So I need some variation of that expression for any position of the HEAD_CTRL.
I want the eyebrows, to be in some Y position when the blink slide is set to “SURPRISE EYES” and Y position +4 with any other.

Something like this, but in proper java language:

a=thisComp.layer(“HEAD_CTRL”).effect(“BLINK”)(“Slider”);
if((a>30)&&(a<=40)) Y position else Y position+4

Thanks.

Roberto Mata replied 11 years, 7 months ago 2 Members · 2 Replies
2 Replies

Dan Ebberts
January 22, 2015 at 2:57 pm

Try this:

if((a>30)&&(a<=40)) value else value+4

Dan
Roberto Mata
January 22, 2015 at 3:18 pm

Worked great!

Thanks, Dan. And sorry for my novice question.

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