interpolating expressions are game changing – after effects expression tutorial
Interpolating expressions are really useful ways to convert ( or map ) one range of values to another, and once you learn about them / start using them more you start to understand that there are tons of applications for expressions like this to either solve problems for you or just speed up your workflow!
The interpolating expressions are linear(), ease(), easeIn(), and easeOut(). The only difference between them is how your values get interpolated (converted). Do you want them to interpolate 1:1? Then your best bet is linear(). Want them to interpolate more smoothly by accelerating and decelerating in and out of your output values? Then go with ease().
All of them take the same arguments: linear(input, min, max, value1, value2)
input is the number the expression will look at and use to interpolate to your new value
min and max are the minimum and maximum value of your input
lastly value1 and value2 are the output values
The expression will output value1 while the input is less than or equal to min, and output value2 while it's greater than or equal to max, any input value between the min and max will be interpolated based on which interpolation expression you chose!
for example if the expression was linear(slider, 0, 100, 0, 10) — where slider is a linked slider controller, if the slider was at 0 the output would be 0, if it was at 100 the output would be 10 and if it was at 50 the output would be 5!
Now the power of these expressions really come from the fact that while the input, min, and max need to be numbers, the value1 and value2 outputs can be almost anything! You can rig up a slider to control the colors of layers in your projects, use the distance between objects to change a layer's size, or have a layer's Y value control the rotation of another layer!.. just to name a few. And all this is done without a single keyframe!
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timestamps
0:00 - how the expression works
2:07 - variable parenting (trademark) example
4:03 - stabilizing zoom example
5:00 - creating reusable assets / templates
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