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layer visibility expression
I would like to create an expression that turns a layers visibility ON or OFF (the little eyeball, not opacity) based on a Null layers’ checkbox control (the expression control effect)
how can I do this?
what parameter do I apply the expression to?(basically I have a mega-complex comp and want to turn off layers (many of which are nested in other comps) in sets, quickly.
thanks!
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6 Replies
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Assumint the null is in another comp (Comp 1), the opacity expression for a layer in Comp 2 would look like this:
if(comp(“Comp 1”).layer(“Null 1”).effect(“Checkbox Control”)(“Checkbox”) == 1) 100 else 0
Dan
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Dan, is there a way to get the driven layers visibility switch to turn off (rather than turn off opacity)
I am trying to turn on/off sets of layers to make the project easier to work around/render, and am hoping turning of sets of layers (automatically using experssions) will help.
For example, I would like to turn off all titles, then maybe turn off all motion footage clips etc.
thanks!
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what got me thinking that this is possible is the trapcode echospace demo video shows the effect, which basically, automatically applies expressions to layers it creates, turn ON/OFF sets of layers visibility.
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You’d have to do it with a script. Expressions don’t have write access to the “eyeball”.
Dan
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hmm, then perhaps a script that turns off all layers with certain text in its name?
Is that possible? -
I can’t think of any reason that wouldn’t work.
Dan
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