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Map range of values to multiple other values
Hi,
I’ve been trying to figure out a simple way to map a range of values of one parameter to multiple values in another parameter, like a basic interpolation expression, except that I have more than two values that need to be mapped. I’ve used if/else statements, which works, but if there are many values to map, it requires many if/else statements and I’m wondering if there’s a better way?
For example, let’s say the rotation of layer1 goes from 0 to 50 to 60. if I want to make layer 2’s opacity go from 100 to 80 to 20, using layer1’s rotation values as the prompt, is there a single line of code to do this?
something like:t = thisComp.layer(“layer1”).transform.rotation;
linear(t, 0, 50, 60, 100, 80, 20)Thanks.
After Effects templates – lens flares, light leaks, old film effects, digital glitches, VHS glitches, and more: https://CreationEffects.com
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2 Replies
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There’s no way that I know of to do it all in one statement. If you only have a few range segments, you can do it fairly compactly, like this (I added another range to your example):
t = thisComp.layer(“layer1”).transform.rotation;
if (t < 50) linear(t, 0, 50, 100, 80)
else if (t < 60) linear(t,50,60,80,20)
else linear(t,60,100,20,0)If you have a lot of ranges, I would probably set it up as arrays, but that code gets a little more complicated.
Dan
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Ok, thank you Dan. BTW, your article on Random Motion Expressions has been a huge help to me. Thanks.
After Effects templates – lens flares, light leaks, old film effects, digital glitches, VHS glitches, and more: https://CreationEffects.com
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