Expression depending on 2 checkboxes or more

Adobe After Effects Expressions

Expression depending on 2 checkboxes or more

Posted by Frank Bemthuis on October 16, 2017 at 2:54 pm

Good day everyone,

In AE, I synced 4 different versions of 1 short video (a white/alpha transition for the Track Matte Key effect), so when I import it into the Graphic Essential Panel, it would be possible in Premiere Pro to toggle on a hard-keyed version, a speed-up version and a combination.

The plan is to do it by the following scheme:
Hard-key: OFF
Speed 2x: OFF
= video 1 (soft-key, speed 1x) 100% opacity.
= video 2 (soft-key, speed 2x) 0% opacity.
= video 3 (hard-key, speed 1x) 0% opacity.
= video 4 (hard-key, speed 2x) 0% opacity.

Hard-key: OFF
Speed 2x: ON
= video 1 (soft-key, speed 1x) 0% opacity.
= video 2 (soft-key, speed 2x) 100% opacity.
= video 3 (hard-key, speed 1x) 0% opacity.
= video 4 (hard-key, speed 2x) 0% opacity.

Hard-key: ON
Speed 2x: OFF
= video 1 (soft-key, speed 1x) 0% opacity.
= video 2 (soft-key, speed 2x) 0% opacity.
= video 3 (hard-key, speed 1x) 100% opacity.
= video 4 (hard-key, speed 2x) 0% opacity.

Hard-key: ON
Speed 2x: ON
= video 1 (soft-key, speed 1x) 0% opacity.
= video 2 (soft-key, speed 2x) 0% opacity.
= video 3 (hard-key, speed 1x) 0% opacity.
= video 4 (hard-key, speed 2x) 100% opacity.

The only thing is, I’m looking for a way to make the opacity of each layer depending on 2 checkboxes (in instead of 1).
Trying to let it depend on just 1 checkbox with expressions already succeeded (see code below)

if (thisComp.layer("Expr_CTRL").effect("Hard-key")("Checkbox") == 0) 100 else 0

Brendon Murphy replied 8 years, 7 months ago 2 Members · 1 Reply
1 Reply

Brendon Murphy
October 16, 2017 at 6:36 pm

I don’t know anything about the part where you’re interfacing with Premiere, but to make this work in AE you just need to set up the additional condition for your if/else expression, as shown below. You’ll notice I created variables for the checkboxes to make things easier:

//on video 1 opacity hardKeyBox = thisComp.layer("Expr_CTRL").effect("Hard-key")("Checkbox"); speedBox = thisComp.layer("Expr_CTRL").effect("Speed 2x")("Checkbox"); if (hardKeyBox== 0&&speedBox==0) 100 else 0
//on video 2 opacity hardKeyBox = thisComp.layer("Expr_CTRL").effect("Hard-key")("Checkbox"); speedBox = thisComp.layer("Expr_CTRL").effect("Speed 2x")("Checkbox"); if (hardKeyBox== 0&&speedBox==1) 100 else 0 //on video 3 opacity hardKeyBox = thisComp.layer("Expr_CTRL").effect("Hard-key")("Checkbox"); speedBox = thisComp.layer("Expr_CTRL").effect("Speed 2x")("Checkbox"); if (hardKeyBox== 1&&speedBox==0) 100 else 0
//on video 4 opacity hardKeyBox = thisComp.layer("Expr_CTRL").effect("Hard-key")("Checkbox"); speedBox = thisComp.layer("Expr_CTRL").effect("Speed 2x")("Checkbox"); if (hardKeyBox== 1&&speedBox==1) 100 else 0

Brendon Murphy
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Visual Effects
http://www.brendonmurphy.net

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