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Turning on and off an effect via expressions
As the subject says, I want to turn on/off effects with a checkbox
I have on the checkbox
if(thisComp.layer(“Pen”).effect(“Pen Sketch”)(“Checkbox”)==1) comp(“Pre”).Layer(“Pen”).Effect(“Brush Strokes”).active=1 else comp(“Pre”).Layer(“Pen”).Effect(“Brush Strokes”).active=0The checkbox works, just doesn’t turn off the effect.
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5 Replies
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well, I know my first problem. I expressions in a proporty can only effect that property….
So… where do I put the expression to disable a layer? And I know active is for layers but I don’t even know if they work for effects as well…. and… boy do expressions suck… and rock…
back to reading
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You can’t disable layers with expressions, but you can set their opacity to zero.
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I see a couple of basic problems. First, you can’t affect a property with an expression applied to a different property. An expression can only control the value of the property it’s applied to.
Second, an effect’s “active” attribute is read-only.
What you could do though is apply an expression to the Brush Stroke’s Blend With Original parameter and set it to 0 or 100% based on the checkbox.
Dan
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Well, dangit, that’s what I had originally and figuared there was a more correct way. So… when would active be used?
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Hey Dan,
Thanks for the help. I had read your guide before I knew much about expressions and was pretty lost. I just got done reading through it again and it all made sense. Progress! It answered a lot of other questions I had too.
Thanks again,
Ty
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