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Expression for switching between layer opacities
Howdy everyone!
I’ve tried searching for a solution to this, but it’s kind of a specific questions.
I have created a character with multiple angles (Front/LEFT/RIGHT. I have rigged it so that when I make the character walk with a master controller all angles follow. However, to streamline switching between angles, I was wondering if there is an expression I can add to a slider on the master control that will switch the opacity of the layers?
If any one knows how to do this, I’d love to hear!
Thanks, I hope whatever you may be working on is rockin’!
Scott
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3 Replies
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Copy this expression to your three layers.
Change the value for myIndex to what you want to respond it to. 1/2/3 I guess ?Make sure you change “Null 1” to the name of your controller Null and add an Expression control:
Slider that you rename to “switch”I’ve added a rounding so for example 1.4 will still trigger 1.
myIndex = 1;
e=Math.round(thisComp.layer("Null 1").effect("switch")("Slider").value);e==myIndex ? value : 0;
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Bam! That worked an absolute treat! Thanks Filip!
If you wouldn’t mind, could you please break down the expression for me? I just want to understand why it’s doing what it is doing…
Thanks again!
Scotty
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I think the first two lines are self explanatory?
Store the value 1 in a variable my Index
Store the rounded value of the switch slider in the variable emyIndex = 1;
e=Math.round(thisComp.layer(“Null 1”).effect(“switch”)(“Slider”).value);e==myIndex ? value : 0;
The final line uses ? : which is shorthand for if / then / else:
If e equals myIndex then value else 0This could have been then 100 else 0
But by using “value” you can still set it to an other opacity or keyframe a fade In etc.
Value refers to the value of the property before expressions were applied.
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