protected override Result RunCommand(RhinoDoc doc, RunMode mode)
    {
      m_doc = doc;

      m_window = new Window {Title = "Object ID and Thread ID", Width = 500, Height = 75};
      m_label = new Label();
      m_window.Content = m_label;
      new System.Windows.Interop.WindowInteropHelper(m_window).Owner = Rhino.RhinoApp.MainWindowHandle();
      m_window.Show();


      // register the rhinoObjectAdded method with the AddRhinoObject event
      RhinoDoc.AddRhinoObject += RhinoObjectAdded;

      // add a sphere from the main UI thread.  All is good
      AddSphere(new Point3d(0,0,0));

      // add a sphere from a secondary thread. Not good: the rhinoObjectAdded method
      // doesn't work well when called from another thread
      var add_sphere_delegate = new Action<Point3d>(AddSphere);
      add_sphere_delegate.BeginInvoke(new Point3d(0, 10, 0), null, null);

      // handle the AddRhinoObject event with rhinoObjectAddedSafe which is
      // desgined to work no matter which thread the call is comming from.
      RhinoDoc.AddRhinoObject -= RhinoObjectAdded;
      RhinoDoc.AddRhinoObject += RhinoObjectAddedSafe;

      // try again adding a sphere from a secondary thread.  All is good!
      add_sphere_delegate.BeginInvoke(new Point3d(0, 20, 0), null, null);

      doc.Views.Redraw();

      return Result.Success;
    }

 public static Rhino.Commands.Result SelByUserText(RhinoDoc doc)
 {
     // You don't have to override RunCommand if you don't need any user input. In
     // this case we want to get a key from the user. If you return something other
     // than Success, the selection is canceled
     return Rhino.Input.RhinoGet.GetString("key", true, ref m_key);
 }

    public static Result ReplaceHatchPattern(RhinoDoc doc)
    {
        ObjRef[] obj_refs;
        var rc = RhinoGet.GetMultipleObjects("Select hatches to replace", false, ObjectType.Hatch, out obj_refs);
        if (rc != Result.Success || obj_refs == null)
          return rc;

        var gs = new GetString();
        gs.SetCommandPrompt("Name of replacement hatch pattern");
        gs.AcceptNothing(false);
        gs.Get();
        if (gs.CommandResult() != Result.Success)
          return gs.CommandResult();
        var hatch_name = gs.StringResult();

        var pattern_index = doc.HatchPatterns.Find(hatch_name, true);

        if (pattern_index < 0)
        {
          RhinoApp.WriteLine("The hatch pattern \"{0}\" not found  in the document.", hatch_name);
          return Result.Nothing;
        }

        foreach (var obj_ref in obj_refs)
        {
          var hatch_object = obj_ref.Object() as HatchObject;
          if (hatch_object.HatchGeometry.PatternIndex != pattern_index)
          {
        hatch_object.HatchGeometry.PatternIndex = pattern_index;
        hatch_object.CommitChanges();
          }
        }
        doc.Views.Redraw();
        return Result.Success;
    }

    public static Result SetActiveView(RhinoDoc doc)
    {
        // view and view names
        var active_view_name = doc.Views.ActiveView.ActiveViewport.Name;

        var non_active_views =
          doc.Views
          .Where(v => v.ActiveViewport.Name != active_view_name)
          .ToDictionary(v => v.ActiveViewport.Name, v => v);

        // get name of view to set active
        var gs = new GetString();
        gs.SetCommandPrompt("Name of view to set active");
        gs.AcceptNothing(true);
        gs.SetDefaultString(active_view_name);
        foreach (var view_name in non_active_views.Keys)
          gs.AddOption(view_name);
        var result = gs.Get();
        if (gs.CommandResult() != Result.Success)
          return gs.CommandResult();

        var selected_view_name =
          result == GetResult.Option ? gs.Option().EnglishName : gs.StringResult();

        if (selected_view_name != active_view_name)
          if (non_active_views.ContainsKey(selected_view_name))
        doc.Views.ActiveView = non_active_views[selected_view_name];
          else
        RhinoApp.WriteLine("\"{0}\" is not a view name", selected_view_name);

        return Rhino.Commands.Result.Success;
    }

        protected override Result RunCommand(RhinoDoc doc, RunMode mode)
        {
            Loop loop = new Loop();
            loop.Run(doc);

            return Result.Success;
        }

    public static Result DrawMesh(RhinoDoc doc)
    {
        var gs = new GetObject();
        gs.SetCommandPrompt("select sphere");
        gs.GeometryFilter = ObjectType.Surface;
        gs.DisablePreSelect();
        gs.SubObjectSelect = false;
        gs.Get();
        if (gs.CommandResult() != Result.Success)
          return gs.CommandResult();

        Sphere sphere;
        gs.Object(0).Surface().TryGetSphere(out sphere);
        if (sphere.IsValid)
        {
          var mesh = Mesh.CreateFromSphere(sphere, 10, 10);
          if (mesh == null)
        return Result.Failure;

          var conduit = new DrawBlueMeshConduit(mesh) {Enabled = true};
          doc.Views.Redraw();

          var in_str = "";
          Rhino.Input.RhinoGet.GetString("press <Enter> to continue", true, ref in_str);

          conduit.Enabled = false;
          doc.Views.Redraw();
          return Result.Success;
        }
        else
          return Result.Failure;
    }

 public static Result ViewportResolution(RhinoDoc doc)
 {
     var active_viewport = doc.Views.ActiveView.ActiveViewport;
     RhinoApp.WriteLine("Name = {0}: Width = {1}, Height = {2}",
       active_viewport.Name, active_viewport.Size.Width, active_viewport.Size.Height);
     return Result.Success;
 }

 public void BakeGeometry(RhinoDoc doc, ObjectAttributes att, List<Guid> obj_ids)
 {
     List<Text3d>.Enumerator tag;
     if (att == null)
     {
     att = doc.CreateDefaultAttributes();
     }
     try
     {
     tag = this.m_tags.GetEnumerator();
     while (tag.MoveNext())
     {
         Text3d tag3d = tag.Current;
         Guid id = doc.Objects.AddText(tag3d, att);
         if (!(id == Guid.Empty))
         {
             obj_ids.Add(id);
         }
     }
     }
     finally
     {
        tag.Dispose();
     }
 }

    public static Result SelectObjectsInObjectGroups(RhinoDoc doc)
    {
        ObjRef obj_ref;
        var rs = RhinoGet.GetOneObject(
          "Select object", false, ObjectType.AnyObject, out obj_ref);
        if (rs != Result.Success)
          return rs;
        var rhino_object = obj_ref.Object();
        if (rhino_object == null)
          return Result.Failure;

        var rhino_object_groups = rhino_object.Attributes.GetGroupList().DefaultIfEmpty(-1);

        var selectable_objects= from obj in doc.Objects.GetObjectList(ObjectType.AnyObject)
                            where obj.IsSelectable(true, false, false, false)
                            select obj;

        foreach (var selectable_object in selectable_objects)
        {
          foreach (var group in selectable_object.Attributes.GetGroupList())
          {
        if (rhino_object_groups.Contains(group))
        {
            selectable_object.Select(true);
            continue;
        }
          }
        }
        doc.Views.Redraw();
        return Result.Success;
    }

    public static Result CreateMeshFromBrep(RhinoDoc doc)
    {
        ObjRef obj_ref;
        var rc = RhinoGet.GetOneObject("Select surface or polysurface to mesh", true, ObjectType.Surface | ObjectType.PolysrfFilter, out obj_ref);
        if (rc != Result.Success)
          return rc;
        var brep = obj_ref.Brep();
        if (null == brep)
          return Result.Failure;

        // you could choose anyone of these for example
        var jagged_and_faster = MeshingParameters.Coarse;
        var smooth_and_slower = MeshingParameters.Smooth;
        var default_mesh_params = MeshingParameters.Default;
        var minimal = MeshingParameters.Minimal;

        var meshes = Mesh.CreateFromBrep(brep, smooth_and_slower);
        if (meshes == null || meshes.Length == 0)
          return Result.Failure;

        var brep_mesh = new Mesh();
        foreach (var mesh in meshes)
          brep_mesh.Append(mesh);
        doc.Objects.AddMesh(brep_mesh);
        doc.Views.Redraw();

        return Result.Success;
    }

 protected override Result RunCommand(RhinoDoc doc, RunMode mode)
 {
     RcCore.It.EngineSettings.SaveDebugImages = !RcCore.It.EngineSettings.SaveDebugImages;
     var saving = RcCore.It.EngineSettings.SaveDebugImages ? "Saving" : "Not saving";
     RhinoApp.WriteLine($"{saving} debug images");
     return Result.Success;
 }

        protected override Result RunCommand(RhinoDoc doc, RunMode mode)
        {
            Plugin.InitialiseCSycles();
            if (doc.Views.ActiveView.ActiveViewport.DisplayMode.Id == Guid.Parse("69E0C7A5-1C6A-46C8-B98B-8779686CD181"))
            {
                var rvp = doc.Views.ActiveView.RealtimeDisplayMode as RenderedViewport;

                if (rvp != null)
                {
                    var getNumber = new GetInteger();
                    getNumber.SetLowerLimit(1, true);
                    getNumber.SetDefaultInteger(rvp.HudMaximumPasses()+100);
                    getNumber.SetCommandPrompt("Set new sample count");
                    var getRc = getNumber.Get();
                    if (getNumber.CommandResult() != Result.Success) return getNumber.CommandResult();
                    if (getRc == GetResult.Number)
                    {
                        var nr = getNumber.Number();
                        RhinoApp.WriteLine($"User changes samples to {nr}");
                        rvp.ChangeSamples(nr);
                        return Result.Success;
                    }
                }
            }

            RhinoApp.WriteLine("Active view isn't rendering with Cycles");

            return Result.Nothing;
        }

    public static Result Leader(RhinoDoc doc)
    {
        var points = new Point3d[]
        {
          new Point3d(1, 1, 0),
          new Point3d(5, 1, 0),
          new Point3d(5, 5, 0),
          new Point3d(9, 5, 0)
        };

        var xy_plane = Plane.WorldXY;

        var points2d = new List<Point2d>();
        foreach (var point3d in points)
        {
          double x, y;
          if (xy_plane.ClosestParameter(point3d, out x, out y))
          {
        var point2d = new Point2d(x, y);
        if (points2d.Count < 1 || point2d.DistanceTo(points2d.Last<Point2d>()) > RhinoMath.SqrtEpsilon)
          points2d.Add(point2d);
          }
        }

        doc.Objects.AddLeader(xy_plane, points2d);
        doc.Views.Redraw();
        return Result.Success;
    }

    protected override Result RunCommand(RhinoDoc doc, RunMode mode)
    {
      // Get the name of the instance definition to rename
      string instance_definition_name = "";
      var rc = RhinoGet.GetString("Name of block to delete", true, ref instance_definition_name);
      if (rc != Result.Success)
        return rc;
      if (string.IsNullOrWhiteSpace(instance_definition_name))
        return Result.Nothing;
     
      // Verify instance definition exists
      var instance_definition = doc.InstanceDefinitions.Find(instance_definition_name, true);
      if (instance_definition == null) {
        RhinoApp.WriteLine("Block \"{0}\" not found.", instance_definition_name);
        return Result.Nothing;
      }

      // Verify instance definition can be deleted
      if (instance_definition.IsReference) {
        RhinoApp.WriteLine("Unable to delete block \"{0}\".", instance_definition_name);
        return Result.Nothing;
      }

      // delete block and all references
      if (!doc.InstanceDefinitions.Delete(instance_definition.Index, true, true)) {
        RhinoApp.WriteLine("Could not delete {0} block", instance_definition.Name);
        return Result.Failure;
      }

      return Result.Success;
    }

    protected override Result RunCommand(RhinoDoc doc, RunMode mode)
    {
      var points = new List<Point3d>
      {
        new Point3d(0, 0, 0),
        new Point3d(0, 0, 1),
        new Point3d(0, 1, 0),
        new Point3d(0, 1, 1),
        new Point3d(1, 0, 0),
        new Point3d(1, 0, 1),
        new Point3d(1, 1, 0),
        new Point3d(1, 1, 1)
      };

      RhinoApp.WriteLine("Before sort ...");
      foreach (var point in points)
        RhinoApp.WriteLine("point: {0}", point);

      var sorted_points = Point3d.SortAndCullPointList(points, doc.ModelAbsoluteTolerance);

      RhinoApp.WriteLine("After sort ...");
      foreach (var point in sorted_points)
        RhinoApp.WriteLine("point: {0}", point);

      doc.Objects.AddPoints(sorted_points);
      doc.Views.Redraw();
      return Result.Success;
    }

    public static Result CopyGroups(RhinoDoc doc)
    {
        var go = new Rhino.Input.Custom.GetObject();
        go.SetCommandPrompt("Select objects to copy in place");
        go.GroupSelect = true;
        go.SubObjectSelect = false;
        go.GetMultiple(1, 0);
        if (go.CommandResult() != Result.Success)
          return go.CommandResult();

        var xform = Transform.Identity;
        var group_map = new Dictionary<int, int>();

        foreach (var obj_ref in go.Objects())
        {
          if (obj_ref != null)
          {
        var obj = obj_ref.Object();
        var duplicate = doc.Objects.Transform(obj_ref.ObjectId, xform, false);
        RhinoUpdateObjectGroups(ref obj, ref group_map);
          }
        }
        doc.Views.Redraw();
        return Result.Success;
    }

    public static Result NurbsCurveIncreaseDegree(RhinoDoc doc)
    {
        ObjRef obj_ref;
        var rc = RhinoGet.GetOneObject(
          "Select curve", false, ObjectType.Curve, out obj_ref);
        if (rc != Result.Success) return rc;
        if (obj_ref == null) return Result.Failure;
        var curve = obj_ref.Curve();
        if (curve == null) return Result.Failure;
        var nurbs_curve = curve.ToNurbsCurve();

        int new_degree = -1;
        rc = RhinoGet.GetInteger(string.Format("New degree <{0}...11>", nurbs_curve.Degree), true, ref new_degree,
          nurbs_curve.Degree, 11);
        if (rc != Result.Success) return rc;

        rc = Result.Failure;
        if (nurbs_curve.IncreaseDegree(new_degree))
          if (doc.Objects.Replace(obj_ref.ObjectId, nurbs_curve))
        rc = Result.Success;

        RhinoApp.WriteLine("Result: {0}", rc.ToString());
        doc.Views.Redraw();
        return rc;
    }

    public static Result PickPoint(RhinoDoc doc)
    {
        // this creates a point where the mouse is clicked.
        var gp = new GetPoint();
        gp.SetCommandPrompt("Click for new point");
        gp.Get();
        if (gp.CommandResult() != Result.Success)
          return gp.CommandResult();
        var point3d = gp.Point();
        doc.Objects.AddPoint(point3d);
        doc.Views.Redraw();

        // selects a point that already exists
        ObjRef obj_ref;
        var rc = RhinoGet.GetOneObject("Select point", false, ObjectType.Point, out obj_ref);
        if (rc != Result.Success)
          return rc;
        var point = obj_ref.Point();
        RhinoApp.WriteLine("Point: x:{0}, y:{1}, z:{2}",
          point.Location.X,
          point.Location.Y,
          point.Location.Z);
        doc.Objects.UnselectAll();

        // selects multiple points that already exist
        ObjRef[] obj_refs;
        rc = RhinoGet.GetMultipleObjects("Select point", false, ObjectType.Point, out obj_refs);
        if (rc != Result.Success)
          return rc;
        foreach (var o_ref in obj_refs)
        {
          point = o_ref.Point();
          RhinoApp.WriteLine("Point: x:{0}, y:{1}, z:{2}",
        point.Location.X,
        point.Location.Y,
        point.Location.Z);
        }
        doc.Objects.UnselectAll();

        // also selects a point that already exists.
        // Used when RhinoGet doesn't provide enough control
        var go = new GetObject();
        go.SetCommandPrompt("Select point");
        go.GeometryFilter = ObjectType.Point;
        go.GetMultiple(1, 0);
        if (go.CommandResult() != Result.Success)
          return go.CommandResult();
        foreach (var o_ref in  go.Objects())
        {
          point = o_ref.Point();
          if (point != null)
        RhinoApp.WriteLine("Point: x:{0}, y:{1}, z:{2}",
          point.Location.X,
          point.Location.Y,
          point.Location.Z);
        }

        doc.Views.Redraw();
        return Result.Success;
    }

    /// <summary>
    /// Commmand.RunCommand override
    /// </summary>
    protected override Rhino.Commands.Result RunCommand(RhinoDoc doc, RunMode mode)
    {
        Rhino.Commands.Result rc = Rhino.Commands.Result.Success;

        if (!_bIsLoaded)
        {
          string script = ScriptFromResources(ResourceName, Password);
          if (!string.IsNullOrEmpty(script))
          {
        string macro = string.Format("_-RunScript ({0})", script);
        if (RhinoApp.RunScript(macro, false))
          _bIsLoaded = true;
        else
          rc = Result.Failure;
          }
        }

        if (rc == Result.Success)
        {
          string macro = string.Format("_-RunScript ({0})", EnglishName);
          RhinoApp.RunScript(macro, false);
        }

        return rc;
    }

    protected override Result RunCommand(RhinoDoc doc, RunMode mode)
    {
      Rhino.DocObjects.ObjRef objref;
      var rc = RhinoGet.GetOneObject("Select curve", true, ObjectType.Curve,out objref);
      if(rc!= Result.Success)
        return rc;
      var curve = objref.Curve();
      if( curve==null )
        return Result.Failure;

      var gp = new GetPoint();
      gp.SetCommandPrompt("Pick a location on the curve");
      gp.Constrain(curve, false);
      gp.Get();
      if (gp.CommandResult() != Result.Success)
        return gp.CommandResult();

      var point = gp.Point();
      double closest_point_param;
      if (curve.ClosestPoint(point, out closest_point_param))
      {
        RhinoApp.WriteLine("point: ({0}), parameter: {1}", point, closest_point_param);
        doc.Objects.AddPoint(point);
        doc.Views.Redraw();
      }
      return Result.Success;
    }