Learn all about Expression Controls in After Effects!
Expression controls are sliders, checkboxes, angle/colour selectors and other controls that you can add to your composition in After Effects. You can tie their value to different effect parameters in your composition to control all of them at once :)
You can find a detailed written version of this tutorial with step by step instructions on my website:
[ Ссылка ]
Here are a few tips on using expressions if you get bored with what's in the tutorial:
-- get mathematical! --
You can use mathematical operators in your expressions, e.g
thisComp.layer("CONTROL").effect("Slider Control")("Slider") * 3.0
or
(thisComp.layer("CONTROL").effect("Slider Control")("Slider") + 50) / 100
-- use variables --
You can declare and use variables in expressions, e.g.
var x = thisComp.layer("CONTROL").effect("Slider Control")("Slider");
var y = thisComp.layer("CONTROL").effect("Slider Control 2")("Slider")
(x * y) * 0.5
-- multi value parameters --
If a parameter has multiple components, like an x, y and z coordinate, the expression needs to be in the format [x, y, z] where x, y and z can be any expression you want to, e.g.
[height - thisComp.layer("CONTROL").effect("Slider Control")("Slider"), 200]
There are many resources out there so google away - or shoot me a question if anything is unclear :)
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