modifyobjectcolor

          
using System.Drawing;
using Rhino;
using Rhino.DocObjects;
using Rhino.Geometry;
using Rhino.Input;
using Rhino.Commands;

namespace examples_cs
{
  public class ModifyObjectColorCommand : Command
  {
    public override string EnglishName { get { return "csModifyObjectColor"; } }

    protected override Result RunCommand(RhinoDoc doc, RunMode mode)
    {
      ObjRef obj_ref;
      var rc = RhinoGet.GetOneObject("Select object", false, ObjectType.AnyObject, out obj_ref);
      if (rc != Result.Success)
        return rc;
      var rhino_object = obj_ref.Object();
      var color = rhino_object.Attributes.ObjectColor;
      bool b = Rhino.UI.Dialogs.ShowColorDialog(ref color);
      if (!b) return Result.Cancel;

      rhino_object.Attributes.ObjectColor = color;
      rhino_object.Attributes.ColorSource = ObjectColorSource.ColorFromObject;
      rhino_object.CommitChanges();

      // an object's color attributes can also be specified
      // when the object is added to Rhino
      var sphere = new Sphere(Point3d.Origin, 5.0);
      var attributes = new ObjectAttributes();
      attributes.ObjectColor = Color.CadetBlue;
      attributes.ColorSource = ObjectColorSource.ColorFromObject;
      doc.Objects.AddSphere(sphere, attributes);

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