I remember an example of a clay animation where parts separated using shapekeys and sculpt tool?

[BigBlend]

Now I can’t find anything about it.

I think it was using shapekeys and sculpt tool. Maybe it was in Blender News a few years ago with an example animation of it.

It was that shape keys could save two different shapes not having the same vertex count or something like that.

[hurtle (sam)]

you might be thinking of keymesh?

Keymesh

I did complete rewrite of iconic Keymesh add-on by Pablo Dobarro, that lets you create stop-motion animation inside Blender. Keymesh makes object data picker animatable, meaning objects can have new data on every frame. That gives you ability to sculpt animations frame-by-frame, or even do something more experimental, like frame-by-frame attribute painting. Here are some videos that showcase functionality of Keymesh: [Blender Claymation (old KeyMesh) - Random facial animation] …

[BigBlend]

@Keymesh

Keymesh

Thank you!

It was this video:

Blender KeyMesh: Proof of concept

Also there is this thread Keymesh