Spherify Deformer
Depending on the set thickness, the Spherify deformer attempts to shape the object to be deformed into a spherical shape. The Spherify deformer has two orange-colored handles. These can be used to interactively control the size and strength in the editor.
NoteThe more spherical the object is to be, the more subdivisions it must have.
Subdivided cube before deforming
Deformed cube (left Strength 70%, right 100%)

