Solid torus graphics and region primitive
FilledTorus[{x, y, z}, {r inner, r outer}]
Graphics3D[{Opacity[0.5], FilledTorus[]}]
→ -Graphics3D-RegionCentroid[FilledTorus[{Subscript[c, 1], Subscript[c, 2], Subscript[c, 3]}, {Subscript[r, inner], Subscript[r, outer]}]]
→ {Subscript[c, 1], Subscript[c, 2], Subscript[c, 3]}Graphics3D[{Opacity[0.5], FilledTorus[]}, Axes -> True]
→ -Graphics3D-