I'm new to Blender.
Is there some way to animate a deformation of a hole on a torus by expanding it?
Like in this video. (until 2.5 second, I don't need to completely shrink it)
I tried to use shape keys and manually sliding edges, but that would be a long process, as I can't merge vertices, so with every slide I need to move more and more copies of edges:
I've also tried using parts of Nurbs Circles with Screw modifier to reverse animate it using angle, but I would still need too change curve points' positions for better animation, it would be easier if curve had something like 2 angles, one around axis and one capturing part of used curve. Moreover, curves are not connected.