T/spline box or - soft cube with symmetric control points

Hi, I-m trying to achieve a shape similar to the one in the image (made in Fusion360 t-spline box) but made in rhino.

I have approximated it with a sphere and then modifying control points but I get asymmetrical control points plus a “vertix” on the sides (see screenshot from rhino).

Is there anyway to do it on rhino in just one surface? (not poysurf)

Hello - you might have a look at the SubD tools in the V7 WIP:


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yep, excatly that. Thanks @pascal