The Torus primitive creates a donut shaped Vectron object (figure 1).
Figure 1: The Torus Vectron object
Major Radius - The radius from the center of the torus to the center of the tube.
Minor Radius - The radius of the tube, this parameter thickens the torus.
Fill - Can be used to control the edge thickness when two or more Vectron objects are subtracted or intersected with each other.