Deforming knee or elbow with lattice.Where ?

Anybody can show me where to found the post who explain this feature ? I completly lost it.How to deform knee or elbow etc … with lattice.Thanks

Spiderman by waves:

You can also search for Lattice by waves or ROUBAL.

Basically you animate the Lattice using RVK’s


Maybe it was this one?

Shape keys are a better way to do it.