Simple effect but took a lot of work, almost 3 hours. Its like a slice but then new faces are created and added between the two mesh halves, finally the mesh has to be rebuilt so that the faces are glued together. From here I can hopefully do some interesting multiple offsets.
The ‘cheese toastie’ glitch algorithm that pulls apart a mesh down the middle stretching mesh faces between the two halves, a bit like pulling apart a melted cheese toastie. The one above does exactly that, the one below additionally deletes some of the faces so that you see through it.