Penner easing expressions with layer slide

[Yoan Boisjoli]

Hey all,

I went down this same rabbit hole trying to make Penner easings work reliably in After Effects, especially when switching between 1D, 2D, and 3D properties or building templates for clients.

After getting tired of breaking expressions and rewriting the math every time I wanted to change an easing type, I ended up spending two years learning to script and building a tool called Keyless. It applies Penner easings without keyframes and just works across property types.

If you’re still dealing with this kind of setup, it might save you a few headaches:

https://aescripts.com/keyless/

I’m at the stage where I’d genuinely love any feedback if anyone here gives it a try.