partial class Examples
{
  public static Rhino.Commands.Result AddTorus(Rhino.RhinoDoc doc)
  {
    const double major_radius = 4.0;
    const double minor_radius = 2.0;

    Rhino.Geometry.Plane plane = Rhino.Geometry.Plane.WorldXY;
    Rhino.Geometry.Torus torus = new Rhino.Geometry.Torus(plane, major_radius, minor_radius);
    Rhino.Geometry.RevSurface revsrf = torus.ToRevSurface();
    if (doc.Objects.AddSurface(revsrf) != Guid.Empty)
    {
      doc.Views.Redraw();
      return Rhino.Commands.Result.Success;
    }
    return Rhino.Commands.Result.Failure;
  }
}

import Rhino
import scriptcontext
import System.Guid

def AddTorus():
    major_radius = 4.0
    minor_radius = 2.0

    plane = Rhino.Geometry.Plane.WorldXY
    torus = Rhino.Geometry.Torus(plane, major_radius, minor_radius)
    revsrf = torus.ToRevSurface()

    if scriptcontext.doc.Objects.AddSurface(revsrf)!=System.Guid.Empty:
        scriptcontext.doc.Views.Redraw()
        return Rhino.Commands.Result.Success
    return Rhino.Commands.Result.Failure

if __name__=="__main__":
    AddTorus()