///<summary> This gets called when when the user runs this command.</summary>
        public override IRhinoCommand.result RunCommand(IRhinoCommandContext context)
        {
            MRhinoGetObject go = new MRhinoGetObject();

            go.SetCommandPrompt("Select rectangular light");
            go.SetGeometryFilter(IRhinoGetObject.GEOMETRY_TYPE_FILTER.light_object);
            go.GetObjects(1, 1);
            if (go.CommandResult() != IRhinoCommand.result.success)
            {
                return(go.CommandResult());
            }

            IOnLight light = go.Object(0).Light();

            if (null == light)
            {
                return(IRhinoCommand.result.failure);
            }

            if (!light.IsRectangularLight())
            {
                RhUtil.RhinoApp().Print("Not a rectangular light.\n");
                return(IRhinoCommand.result.nothing);
            }

            On3dPoint  origin = light.Location();
            On3dVector xaxis  = light.Length();
            On3dVector yaxis  = light.Width();

            OnPlane    plane      = new OnPlane(origin, xaxis, yaxis);
            OnInterval x_interval = new OnInterval(0.0, xaxis.Length());
            OnInterval y_interval = new OnInterval(0.0, yaxis.Length());

            OnMesh mesh = RhUtil.RhinoMeshPlane(plane, x_interval, y_interval, 2, 2);

            if (null != mesh)
            {
                mesh.ConvertQuadsToTriangles();
                context.m_doc.AddMeshObject(mesh);
                context.m_doc.Redraw();
            }

            return(IRhinoCommand.result.cancel);
        }