https://player.vimeo.com/video/655333668?h=5c15a2a598&badge=0&autopause=0&player_id=0&app_id=58479
A default tfRock object.
The default setting is Sphere; other options are: Cuboid and Custom.
The three Basic Shape settings: Sphere, Cube and Custom, which is set as a Torus in the Polygon Object link field.
In this mode, you will open up the Polygon Object parameter.