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Modify linear expression to use fourth and fifth keyframes of a property
I use this expression structure a lot:
r=transform.yPosition;
k1=transform.yPosition.key(1).value;k2=transform.yPosition.key(2).value;
ease(r,k1,k2,0,22)
Today I’m trying to to the same but instead of using keyframes 1 and 2 y need to use the 4th and 5th, so I wrote this instead:
f=thisComp.layer(“50MM”).cameraOption.zoom;
k1=thisComp.layer(“50MM”).cameraOption.zoom.key(4).value;
k2=thisComp.layer(“50MM”).cameraOption.zoom.key(5).value;
linear(f,k1,k2,100,0);
But when I play the animation the value before the third keyframe is 100, and I need it to be 0 up until the moment it hits the 4th keyframe.
When the 4th keyframe is reached the animation happens as expected.
Thanks in advance for your help.
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9 Replies
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Try this:
f=thisComp.layer("50MM").cameraOption.zoom;
k1=f.key(4).value;
k2=f.key(5).value;
time < f.key(4).time ? 0 : linear(f,k1,k2,100,0);
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Works great, thanks a lot Dan.
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Hey Dan, sorry to be a pest but I think I jumped the gun too fast, the expression is not working and instead is returning the error f.key is not a function.
I tried making f different properties, such as position or rotation but nothing worked.
I was looking at a different expression when I said this one worked. My bad.
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Hmm… It works for me. The only way I can make it fail with that message is to do this:
f=thisComp.layer("50MM").cameraOption;instaed of this:
f=thisComp.layer("50MM").cameraOption.zoom;Maybe you could post a screen shot.
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I’m trying to use it on a different comp with different properties, writing this:
f=thisComp.layer(“cam ctrl”).transform.position[2];
k1=f.key(2).value[2];
k2=f.key(3).value[2];
time < f.key(2).time ? 0 : linear(f,k1,k2,0,58);
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I’d suggest trying it this way:
f=thisComp.layer("cam ctrl").transform.position;
k1=f.key(2).value[2];
k2=f.key(3).value[2];
time < f.key(2).time ? 0 : linear(f[2],k1,k2,0,58);
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that did the trick. thanks a lot.
is the last part before the linear expression a new format for using an if/else statement?
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Not new (it’s the JavaScript conditional operator), but I like it because you can use it on a single line with minimal punctuation.
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Looks like I have some catch-up reading to do then.
Thanks!
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