I am using a series of absolute shape keys to progressively deform a mesh as shown below. Eventually, I want the soap bubble-like spheroid to detach from the originating plane and move away.
My naive approach was to create a further shape key, cut through the mesh at the last point of contact between the bubble and the original surface, and seal each of them separately.
But of course that does not work, as the split is really applied to the underlying mesh, not just to the specific shape key, so it is visible at each step, not just at the end.
How do I proceed from here?