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Controlling a Keyframe Value with Expressions
Hi there
I haven’t had much luck setting up the following action; could someone please explain how to achieve the following? <b style=”font-family: inherit; font-size: inherit; color: var(–bb-body-text-color);”>(A sample project is attached.)
- I have an object in my comp called ‘Square’ and a null layer called ‘Controller’ with a ‘Checkbox Control’ effect on it.
- The scale attribute on ‘Square’ has a keyframe on frame 20 with a value of ’50’ and a keyframe on frame 50 with a value of ‘100’. (A simple scale-up animation over a second (30fps)).
- When the checkbox is checked, I want the value of the second keyframe to be subtracted by 25. So, instead of going from 50 to 100, it’ll go 50 to 75.
Any help would be greatly appreciated.
Thank you!
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3 Replies
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Since your keyframes are linear, you could do something like this:
sc=thisComp.layer("Controller").effect("Size")("Checkbox").value;
sc ? linear(time,key(1).time,key(2).time,key(1).value,key(2).value - [25,25]) : value -
That did it; thank you so much, as always.
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Thank you for solving this, Dan!
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