I outlined the algorithm in my post. There’s no documentation, because it’s something I came up with on the spot. Is it the algorithm as a whole you don’t understand, or some piece of it? I’ll be happy to explain parts of the idea in more detail, but it will be a fairly complex piece of code, so I don’t have time to write and test something.
The basic idea is that you figure out that two cubes are touching (or nearly touching) at four corners. Then, in code, you change the size of one cube’s box collider, and disable the other cube’s collider.
This: [box][box]
becomes this: [box box]